Ultra-light composite beam bridge and construction method thereof

Abstract

The present invention discloses an ultra-light composite beam bridge, comprising a deck structure, corrugated steel plates, a steel mesh, a railing and anchoring structure, and a steel beam and shear stud structure. The deck structure comprises a UHPC layer and an asphalt concrete pavement layer. The corrugated steel plates are positioned beneath the deck structure. The steel mesh comprises an upper steel mesh and a lower steel mesh. The railing and anchoring structure comprises a crash barrier, a connecting steel plate, and embedded anchor bolts. The embedded anchor bolts are connected to the connecting steel plate and the lower steel mesh, respectively. The steel beam and shear stud structure comprises a transverse steel beam, a longitudinal steel beam, and shear studs. The transverse steel beam is connected to the longitudinal steel beam. The shear studs connect the tops of the transverse and longitudinal steel beams to the corrugated steel plates. The present invention also provides a construction method for an ultra-light composite beam bridge. This method eliminates the need for formwork casting of the bridge deck during construction, saving construction steps. Furthermore, it eliminates the need for stiffening ribs and transverse supports on the web of the lower steel beam, thereby meeting the stiffness requirements of the lower steel beam web of the composite beam bridge.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to an ultra-light composite beam bridge and a construction method thereof. Background Art

[0002] As a transportation link that spans various spatial barriers, bridges play an important role in people's production and life. Existing bridges generally include concrete bridges, steel bridges, and composite beam bridges. Although concrete bridges are low-cost, they have smaller spans, heavier weight, and are more complex to construct. Steel bridges have larger spans, lighter weight, and are simpler to construct, but they are expensive. Composite beam bridges are a combination of reinforced concrete decks with steel webs and bottom plates. They have the advantages of both concrete and steel bridges (they have the advantages of steel bridges but the cost is not much higher than that of concrete beam bridges), and are therefore increasingly being studied and applied.

[0003] During the construction of existing composite beam bridges, formwork still needs to be supported to cast the bridge deck. Due to its structural reasons, there is also the problem that the lower steel beam web has low stiffness and requires more stiffening ribs and lateral supports. Summary of the Invention

[0004] The object of the present invention is to provide an ultra-light composite beam bridge and a construction method thereof, which does not require the use of formwork to cast the bridge deck during the construction process, thus saving construction steps, and does not require the addition of a large number of stiffening ribs and transverse supports to the web of the lower steel beam, thereby meeting the stiffness requirements of the web of the lower steel beam of the composite beam bridge.

[0005] The technical solution adopted in the present invention is:

[0006] An ultra-light composite beam bridge comprising a bridge deck structure, corrugated steel plates, steel mesh, railings and anchoring structures, steel beams and shear stud structures;

[0007] The bridge deck structure includes a UHPC layer (the UHPC layer is an ultra-high performance concrete layer) and a conventional asphalt concrete pavement layer located on the UHPC layer;

[0008] The corrugated steel plate is placed under the bridge deck structure and is a closed corrugated steel plate, which includes a bottom plate and a plurality of ribs located on the bottom plate; the ribs are arranged transversely, that is, arranged along the width direction of the bridge deck;

[0009] The steel mesh includes an upper steel mesh and a lower steel mesh; the upper steel mesh is placed between the UHPC layer and the asphalt concrete pavement layer; the lower steel mesh is placed on the corrugated steel plate;

[0010] The railing and anchoring structure includes an anti-collision railing, a connecting steel plate, and an embedded anchor bolt, which constitutes the anchoring structure; the anti-collision railing is placed on both sides of the bridge deck, and its lower end is connected to the connecting steel plate; one end of the embedded anchor bolt is connected to the connecting steel plate, and the other end is connected to the lower layer of steel mesh on the corrugated steel plate;

[0011] The steel beam and shear stud structure is placed under the corrugated steel plate, which includes a transverse steel beam, a longitudinal steel beam, and shear studs; the two ends of the transverse steel beam are respectively connected to the longitudinal steel beam, and the transverse steel beam spans the bridge deck, and the longitudinal steel beam is laid along the length of the bridge; the shear studs connect the tops of the transverse steel beam and the longitudinal steel beam to the corrugated steel plate.

[0012] According to the above scheme, the anchoring structure is a prefabricated structure. The connecting steel plate is a long steel plate with a rectangular cross section arranged along the longitudinal direction of the bridge.

[0013] According to the above solution, a plurality of notches are provided on the rib plate, and the steel bars of the lower layer of steel mesh are placed in the notches.

[0014] According to the above solution, the height between the lower part of the notch and the bottom plate is 1 to 2 cm.

[0015] According to the above solution, the cross-sectional shape of the notch is rectangular, and an arc-shaped chamfer is provided at the lower portion of the notch.

[0016] According to the above solution, the length of the notch is 4 to 5 cm, the height is 2 to 3 cm, and the interval between adjacent notches on the same rib is 10 to 15 cm.

[0017] According to the above solution, the upper steel mesh includes transverse steel bars and longitudinal steel bars, which are arranged in two directions.

[0018] According to the above scheme, the embedded anchor bolt is L-shaped, and its height is the same as the thickness of the UHPC layer. During construction, after the anchor structure is placed on the bottom surface of the corrugated steel plate, the casting height of the UHPC layer just submerges the upper part of the L-shaped anti-pullout anchor bolt (at this time, the upper surface of the UHPC layer is flush with the lower part of the connecting steel plate). The horizontal hook of the embedded anchor bolt hooks the steel bar of the lower steel mesh.

[0019] According to the above solution, the distribution spacing of the embedded anchor bolts is related to the spacing of the corrugated steel plate grooves, and on average 1 to 2 anchor bolts are arranged in each groove.

[0020] According to the above solution, the vertical cross-section of the anti-collision railing is in an inverted U shape, with a small upper end and a large lower end.

[0021] According to the above scheme, the cross-sections of the transverse steel beams and the longitudinal steel beams are I-shaped, which are mainly used to connect the longitudinal beams and support the anti-collision guardrails; among them, the web of the longitudinal steel beam is a curved web, and the intersection line of the curved web and the upper flange plate is a sine curve.

[0022] According to the above solution, the amplitude of the sine curve is 10 to 15 cm, and the wavelength is 50 to 150 cm.

[0023] The present invention also provides a construction method for the ultra-light composite beam bridge, which comprises the following steps:

[0024] Step 1: Cast the piers and foundation;

[0025] Step 2: Erect steel beams (transverse steel beams and longitudinal steel beams);

[0026] Step 3: Lay the corrugated steel plate and connect it to the corrugated steel plate through the top of the steel beam;

[0027] Step 4: Lay the steel mesh and anchor structure (the anchor structure includes connecting steel plates and embedded anchor bolts);

[0028] Step 5: pouring the UHPC layer;

[0029] Step 6: Weld anti-collision railings and lay the bridge deck structure.

[0030] The steel beams in step 2 are prefabricated in the factory in advance. When erected on site, after the crane lifts the steel beams into place, the transverse and longitudinal steel beams are welded in time to ensure the overall stability of the transverse and longitudinal steel beam structures.

[0031] In step 3, the corrugated steel sheets are cut to the corresponding notches according to the design before laying. After the corrugated steel sheets are laid, shear studs are welded to the corresponding positions on the corrugated steel sheets.

[0032] In step four, when laying the steel mesh, first place the lower steel mesh in the corresponding notch of the corrugated steel plate rib, and then lay and tie the upper steel mesh; after the steel mesh is laid, place the embedded anchor bolts at the designated position of the corrugated steel plate.

[0033] In step five, when pouring the UHPC layer, the pouring height of the UHPC layer just submerges the lower surface of the connecting steel plate of the anchor structure.

[0034] In step six, after the UHPC reaches the designed strength, the anti-collision railings are welded to the connecting steel plates; after the railings are installed, the asphalt concrete of the bridge deck is paved.

[0035] The beneficial effects of the present invention are:

[0036] 1. Reduce bridge weight and construction cost: Using UHPC to replace traditional concrete can greatly reduce the thickness of the bridge deck, thereby reducing the weight while increasing the span of the bridge and reducing the construction cost.

[0037] 2. Simple and fast construction, no need for formwork and brackets: By setting up corrugated steel plates, the erection and removal of formwork and brackets are eliminated during the construction process, which simplifies the construction process, makes the construction simple and fast, and improves construction efficiency;

[0038] 3. High material utilization rate and reasonable design: The corrugated steel plate not only acts as a formwork, but also as a traditional steel bar. And because it is located under the UHPC layer, the material utilization rate is high, and the structure is reasonable and reliable.

[0039] 4. The web has good stability, which simplifies the web structure and saves materials: the longitudinal steel beam with curved web has better horizontal bending stiffness than the flat web, which can save the traditional tie beam and reinforced ribs used to support the main beam, improves the material utilization efficiency, reduces the complexity of the structure and the difficulty of construction, and has a reasonable and reliable structure.

[0040] 5. The height-span ratio is small, and the overall structure is more beautiful: Due to the overall lightness of the structure, the height-span ratio of the bridge structure can be designed to be smaller, which greatly improves the landscape effect of the structure. At the same time, the corrugated steel plate does not need to be removed, so that the final structure after casting has a better appearance and a more beautiful shape.

[0041] 6. Good structural crack resistance and fatigue resistance: UHPC layer structure has good tensile properties. The use of UHPC bridge deck can better improve the crack resistance and fatigue resistance of the bridge structure and improve the durability of the bridge structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0043] Figure 1 It is a structural diagram of an ultra-light composite beam bridge;

[0044] Figure 2 It is a schematic diagram of the cross-sectional structure of an ultra-light composite beam bridge;

[0045] Figure 3 It is a schematic diagram of the connection structure of the corrugated steel plate, the lower steel mesh, the railing and the anchoring structure;

[0046] Figure 4 It is a cross-sectional diagram of an ultra-light composite beam bridge;

[0047] Figure 5 It is a schematic diagram of the connection between the bridge deck structure, corrugated steel plate, steel mesh, railings and anchorage structure;

[0048] Figure 6 It is a schematic diagram of the connection between the longitudinal steel beam and the shear studs;

[0049] Figure 7 is a structural diagram of the anchoring structure;

[0050] Figure 8 This is a construction flow chart for an ultra-light composite beam bridge;

[0051] In the figure: 1-bridge deck structure, 11-asphalt concrete pavement, 12-UHPC layer, 2-corrugated steel plate, 21-notch, 22-bottom plate, 23-rib plate, 3-steel mesh, 31-lower steel mesh, 32-upper steel mesh, 4-railing and anchorage structure, 41-anti-collision railing, 42-connecting steel plate, 43-embedded anchor bolt, 5-steel beam and shear stud structure, 51-longitudinal steel beam, 52-transverse steel beam, 53-curved web, 54-shear stud. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] See also Figure 1-Figure 7An ultra-light composite beam bridge comprises a deck structure 1, a corrugated steel plate 2, a steel mesh 3, a railing and anchor structure 4, and a steel beam and shear stud structure 5. The deck structure 1 comprises a UHPC layer 12 and a conventional asphalt concrete pavement 11 located above the UHPC layer 12. The corrugated steel plate 2 is a closed-end corrugated steel plate positioned beneath the deck structure 1 and comprises a base plate 22 and a plurality of ribs 23 located above the base plate 22. The ribs 23 are arranged transversely, i.e., along the width of the bridge deck. To facilitate the installation of rebar and enhance the overall structural stability, multiple notches 21 are provided in the ribs 23. The rebar of the lower layer of the steel mesh 32 is placed within the notches 21. In a preferred embodiment, the notches 21 have a rectangular cross-section, with a curved chamfer at the bottom, and a height of 1.6 cm from the base plate 22. The notches are 4.4 cm long and 2.7 cm high, and the spacing between adjacent notches on the same rib is 13 cm. The steel mesh 3 includes an upper steel mesh 32 and a lower steel mesh 31; the upper steel mesh 32 is placed between the UHPC layer 12 and the asphalt concrete pavement layer 11; the lower steel mesh 31 is placed at the notch 21 of the corrugated steel plate 2. The upper steel mesh 32 includes transverse steel bars and longitudinal steel bars, which are arranged in two directions. The lower steel mesh 31 is arranged in one direction. The railing and anchoring structure 4 includes an anti-collision railing 41, a connecting steel plate 42, and embedded anchor bolts 43. The connecting steel plate 42 and the embedded anchor bolts 43 constitute the anchoring structure. The vertical section of the anti-collision railing 41 is in an inverted U shape, with a small upper end and a large lower end. The anti-collision railing 41 is placed on both sides of the bridge deck, and the lower end is connected to the connecting steel plate 42. The embedded anchor bolt 43 is L-shaped, one end of which is connected to the connecting steel plate 42, and the horizontal hook at the other end hooks the steel bar of the lower steel mesh 31 at the notch 21. In a preferred embodiment, the connecting steel plate 42 is a long steel plate with a rectangular cross-section arranged along the longitudinal direction of the bridge deck. The height of the embedded anchor bolts 43 is the same as the thickness of the UHPC layer 12. During construction, the casting height of the UHPC layer 12 just submerges the upper part of the L-shaped pull-out anchor bolts (embedded anchor bolts 43), that is, the upper surface of the UHPC layer 12 is flush with the lower part of the connecting steel plate 42. The steel beam and shear bolt structure 5 is placed under the corrugated steel plate 2, which includes a transverse steel beam 52, a longitudinal steel beam 51, and shear bolts 54. The two ends of the transverse steel beam 52 are respectively connected to the longitudinal steel beam 51, and the transverse steel beam 52 spans the bridge deck, and the longitudinal steel beam 51 is laid along the length of the bridge; the shear bolts 54 connect the top of the transverse steel beam 52 and the longitudinal steel beam 51 to the bottom plate 22 of the corrugated steel plate 2. In a preferred embodiment, the transverse steel beam 52 and the longitudinal steel beam 51 have an I-shaped cross-section, and the web of the longitudinal steel beam 51 is a curved web 53. The intersection of the curved web 53 and the upper flange plate is a sinusoidal curve. The amplitude of the sinusoidal curve is 12 cm, and the wavelength is 80 cm.

[0054] See also Figure 8 A construction method for an ultralight composite beam bridge comprises the following steps:

[0055] Step 1: Cast bridge piers and foundations.

[0056] Step 2: Erect steel beams (horizontal beams and longitudinal beams); the steel beams are prefabricated in the factory in advance. When erecting on site, the steel beams are hoisted into place by a crane, and the horizontal and longitudinal beams are welded in time.

[0057] Step 3: Lay the corrugated steel sheet and connect it to the top of the steel beam. Before laying the corrugated steel sheet, the corresponding notches have been cut according to the design. After laying the corrugated steel sheet, weld shear studs on the corresponding parts of the corrugated steel sheet.

[0058] Step 4: Lay the steel mesh and anchoring structure (the anchoring structure includes connecting steel plates and embedded anchor bolts); when laying the steel mesh, first place the lower steel mesh in the gap on the rib of the corresponding corrugated steel plate, and then lay and tie the upper steel mesh; after completing the laying of the steel mesh, place the embedded anchor bolts at the designated position of the corrugated steel plate.

[0059] Step 5: pouring the UHPC layer; when pouring the UHPC layer, the pouring height of the UHPC layer just submerges the lower surface of the connecting steel plate of the anchor structure.

[0060] Step 6: After the UHPC reaches the designed strength, weld the anti-collision railing to the connecting steel plate; after the railing is installed, pave the bridge deck with asphalt concrete.

[0061] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An ultra-light composite beam bridge, characterized by: Including bridge deck structure, corrugated steel plate, steel mesh, railing and anchor structure, steel beam and shear stud structure; The bridge deck structure includes a UHPC layer and an asphalt concrete pavement layer located on the UHPC layer; The corrugated steel plate is placed under the bridge deck structure and is a closed corrugated steel plate, which includes a bottom plate and a plurality of ribs located on the bottom plate; the ribs are arranged along the width direction of the bridge deck; The ribs are provided with a plurality of notches; the lower portion of the notches is 1-2 cm above the bottom plate; the cross-section of the notches is rectangular, and the lower portion of the notches is provided with an arc chamfer; the length of the notches is 4-5 cm, the height is 2-3 cm, and the interval between adjacent notches on the same rib is 10-15 cm; The steel mesh includes an upper steel mesh and a lower steel mesh; the upper steel mesh is placed between the UHPC layer and the asphalt concrete pavement layer; the lower steel mesh is placed on the corrugated steel plate, and the steel bars of the lower steel mesh are placed in the gap; The railing and anchoring structure includes a crash barrier, a connecting steel plate, and an embedded anchor bolt. The crash barrier is placed on both sides of the bridge deck, and its lower end is connected to the connecting steel plate. One end of the embedded anchor bolt is connected to the connecting steel plate, and the other end is connected to the lower layer of steel mesh on the corrugated steel plate. The embedded anchor bolt is L-shaped, and its height is the same as the thickness of the UHPC layer, that is, the upper surface of the UHPC layer is flush with the lower surface of the connecting steel plate. The horizontal hook of the embedded anchor bolt hooks the steel bar of the lower layer of steel mesh. The steel beam and shear stud structure is placed under the corrugated steel plate, which includes a transverse steel beam, a longitudinal steel beam, and shear studs; the two ends of the transverse steel beam are respectively connected to the longitudinal steel beam, and the transverse steel beam spans the bridge deck, and the longitudinal steel beam is laid along the length of the bridge; the web of the longitudinal steel beam is a curved web, and the intersection of the curved web and the upper flange plate is a sine curve; the amplitude of the sine curve is 10~15cm, and the wavelength is 50~150cm; the shear studs connect the tops of the transverse steel beam and the longitudinal steel beam to the corrugated steel plate.

2. A construction method for an ultralight composite beam bridge, characterized by: The ultra-light composite beam bridge is the ultra-light composite beam bridge according to claim 1; The method comprises the following steps: Step 1: Cast the piers and foundation; Step 2: Erect steel beams; Step 3: Lay the corrugated steel plate and connect it to the corrugated steel plate through the top of the steel beam; Step 4: Lay the steel mesh and anchor the structure; Step 5: pouring the UHPC layer; Step 6: Weld anti-collision railings and lay the bridge deck structure.

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