Semi-I-shaped steel-UHPC combined trestle deck and construction method thereof

Abstract

The invention belongs to the technical field of bridge structures, and discloses a semi-I-shaped steel-UHPC combined trestle deck and a construction method thereof.The semi-I-shaped steel-UHPC combined trestle deck comprises a supporting part formed by arranging a plurality of semi-I-shaped steel side by side, each semi-I-shaped steel comprises a bottom plate, a vertical web is integrally formed on the bottom plate, a plurality of clamping grooves with upward openings are evenly distributed in the top of the vertical web, and the clamping grooves are formed in the bottom of the bottom plate; a longitudinal and transverse reinforcing mesh is laid on the supporting parts, part of reinforcing steel bars of the longitudinal and transverse reinforcing mesh are correspondingly fixed in the clamping grooves, and a UHPC concrete layer is poured on the longitudinal and transverse reinforcing mesh to form a bridge deck body. The trestle deck has the advantages of being light in self weight, convenient to transport, simple in structure, high in strength, good in durability, easy and rapid to construct, good in economical efficiency and the like, the characteristics of high tensile property of the weather-resistant steel structure and excellent compressive property of the UHPC concrete are fully played, and the overall rigidity and durability of the bridge deck structure are improved; the construction method is relatively simple to operate, the side steel plates can also serve as formworks for UHPC concrete pouring, construction is easy, convenient and rapid, and good popularization value is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge structures, and particularly relates to a semi-I-shaped steel-UHPC composite trestle bridge deck and a construction method thereof. Background Art

[0002] The concrete bridge deck structure has become a commonly used bridge deck form in bridge construction due to its advantages such as high strength, good durability, strong adaptability, low maintenance cost, and good economy. However, due to the large self-weight of concrete, high requirements for the foundation, and the need for more lifting equipment for transportation and construction. Moreover, the tensile strength of concrete is low and it is easy to crack, and reinforcement and prestress techniques are required to make up for it. Secondly, the construction time is long and curing time is needed, so the construction period may be long. In addition, concrete is sensitive to temperature changes and is prone to temperature stress, and expansion joints are required. At the same time, later renovation is difficult, demolition is troublesome, the cost is high, and demolition is easy to generate construction waste.

[0003] The orthotropic steel bridge deck can save steel and has excellent local mechanical properties, reducing the structural self-weight, and is widely used. However, the orthotropic steel bridge deck has a complex structure and a large number of welds. Under the action of wheel loads, the stress amplitude at the steel structure and weld positions is too large, and fatigue cracking is likely to occur. Moreover, due to the insufficient stiffness of the steel bridge deck, under the combined action of heavy vehicle loads and the environment, problems such as rutting, bond layer failure, and delamination occur in the steel bridge deck pavement layer. Summary of the Invention

[0004] In order to solve the deficiencies existing in the above-mentioned prior art, based on the excellent compressive, flexural and tensile mechanical properties and durability of UHPC, as well as the high strength, fatigue resistance and corrosion resistance of weathering steel, the invention provides a semi-I-shaped steel-UHPC composite trestle bridge deck and a construction method thereof; the technical solutions adopted to achieve the above purpose are:

[0005] A semi-I-shaped steel-UHPC composite trestle bridge deck includes a support part formed by arranging a plurality of semi-I-shaped steel side by side. The semi-I-shaped steel includes a bottom plate, on which a vertical web is integrally formed. A plurality of upward-opening card slots are evenly distributed on the top of the vertical web. A vertical and horizontal steel bar mesh is laid on the support part, and some steel bars of the vertical and horizontal steel bar mesh are correspondingly fixed in the card slots. A UHPC concrete layer is poured on the vertical and horizontal steel bar mesh to form a bridge deck body.

[0006] Preferably, side steel plates are provided on the four peripheries of the vertical and horizontal steel bar mesh. The side steel plates are welded to the semi-I-shaped steel. The ends of the longitudinal steel bars and transverse steel bars of the vertical and horizontal steel bar mesh are welded to the side steel plates, and the side steel plates are attached to the periphery of the bridge deck body.

[0007] Preferably, the card slot is a dovetail slot, and the dovetail slot is embedded inside the bridge deck body.

[0008] Preferably, multiple semi-I-shaped steel bars are arranged side by side longitudinally along the bridge deck, and the length direction of the semi-I-shaped steel bars is arranged transversely along the bridge deck. The longitudinal steel bars of the vertical and horizontal steel bar mesh are fixed in the card slots, and the horizontal steel bars of the vertical and horizontal steel bar mesh are tied to the upper layer of the longitudinal steel bars.

[0009] Preferably, the thickness of the bridge deck body is 50 - 60 mm.

[0010] Preferably, an anti-corrosion coating is evenly applied to the bottom of the bridge deck body, and the thickness of the anti-corrosion coating is 0.3 - 0.5 mm.

[0011] A construction method of a semi-I-shaped steel bar - UHPC composite trestle bridge deck as described above includes the following steps:

[0012] S1: Erect multiple semi-I-shaped steel bars and arrange them side by side longitudinally at equal intervals along the bridge deck. The length direction of the semi-I-shaped steel bars is arranged transversely along the bridge deck.

[0013] S2: Support and pour the bottom formwork between two adjacent semi-I-shaped steel bars. The top of the bottom formwork is lower than the card slot of the semi-I-shaped steel bar.

[0014] S3: Arrange a vertical and horizontal steel bar mesh above the bottom formwork. The longitudinal steel bars of the vertical and horizontal steel bar mesh are fixed in the card slots, and the horizontal steel bars of the vertical and horizontal steel bar mesh are tied to the upper layer of the longitudinal steel bars.

[0015] S4: Set side steel plates around the vertical and horizontal steel bar mesh, weld the four side steel plates to each other end to end and weld them to the semi-I-shaped steel bars. The ends of the longitudinal steel bars and the horizontal steel bars are welded to the side steel plates. The four side steel plates and the bottom formwork enclose each other to form a bridge deck formwork for pouring.

[0016] S5: Pour a UHPC concrete layer into the bridge deck formwork to form a bridge deck body. After the bridge deck body solidifies, remove the bottom formwork to complete the prefabrication.

[0017] Preferably, in step S3, when arranging the vertical and horizontal steel bar mesh in the bridge deck formwork, first place the longitudinal steel bars one by one in the card slots and perform spot welding at the card slot positions to connect them into one body. After the longitudinal steel bars are laid, lay the horizontal steel bars on them, and tie the intersections of the horizontal steel bars and the longitudinal steel bars with steel wires.

[0018] Preferably, in step S5, after removing the bottom formwork, clean and repair the surface of the bridge deck body, and apply an anti-corrosion layer to it.

[0019] The beneficial effects of the present invention are:

[0020] (1) The semi-I-shaped weathering steel of the trestle bridge deck of the present invention has characteristics such as high strength, fatigue resistance, and corrosion resistance. The UHPC concrete bridge deck body has ultra-high mechanical properties and durability, further improving the overall stiffness of the bridge deck and suppressing fatigue cracking of the bridge deck structure.

[0021] (2) Multiple semi-I-shaped steel, side steel plates, and vertical and horizontal steel bar meshes inside the trestle bridge of the present invention are welded to form a whole, and the card slots of the semi-I-shaped steel are completely embedded in the UHPC concrete layer, enhancing the shear force between the semi-I-shaped weathering steel and the UHPC concrete layer, and fundamentally improving the bending and crack resistance of the overall structure.

[0022] (3) The side steel plate can also play a protective role for the bridge deck body, avoiding the defect of peeling at the edge of the bridge deck after long-term use.

[0023] (4) The trestle bridge deck of the present invention has the advantages of light self-weight, convenient transportation, simple structure, high strength, good durability, simple and fast construction, and good economy, giving full play to the high tensile performance of the weathering steel structure and the excellent compressive performance of UHPC concrete, and improving the overall stiffness and durability of the bridge deck structure.

[0024] (5) The construction method of the present invention is relatively simple in operation. The side steel plate can also be used as a formwork for pouring UHPC concrete, with simple and fast construction and good popularization value. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the trestle bridge of the present invention;

[0026] Figure 2 is a schematic structural diagram of the semi-I-shaped steel;

[0027] Figure 3 is a schematic construction diagram of step S1 of the construction method of the trestle bridge of the present invention;

[0028] Figure 4 is a schematic construction diagram of steps S2-S3 of the construction method of the trestle bridge of the present invention;

[0029] Figure 5 is a schematic construction diagram of step S4 of the construction method of the trestle bridge of the present invention;

[0030] Figure 6 is a schematic construction diagram of step S5 of the construction method of the trestle bridge of the present invention. Detailed Embodiments

[0031] The present invention will be further described below with reference to the drawings. Specific Embodiment 1:

[0033] As Figure 1 and Figure 2As shown in the figure, the present invention discloses a semi-I-beam - UHPC composite trestle bridge deck, which includes a support part formed by arranging a plurality of semi-I-beams 1 side by side. The semi-I-beam 1 includes a bottom plate 9, on which a vertical web 8 is integrally formed. At the top of the vertical web 8, a plurality of upward-opening card slots 7 are evenly distributed. The card slots 7 can be rectangular card slots, trapezoidal slots or dovetail slots. A vertical and horizontal steel bar mesh 4 is laid on the support part, and some steel bars of the vertical and horizontal steel bar mesh 4 are correspondingly fixed in the card slots 7. A UHPC concrete layer is poured on the vertical and horizontal steel bar mesh to form a bridge deck body 3, and the card slots 7 are embedded inside the bridge deck body 3.

[0034] Among them, side steel plates 2 are provided on the four peripheries of the vertical and horizontal steel bar mesh 4. The side steel plates 2 are welded to the semi-I-beams 1. The ends of the longitudinal steel bars 6 and the transverse steel bars 5 of the vertical and horizontal steel bar mesh 4 are welded to the side steel plates 2, and the side steel plates 2 are attached to the peripheries of the bridge deck body 3.

[0035] The plurality of semi-I-beams 1 can further adopt semi-I-shaped weathering steels 1, which are arranged side by side along the longitudinal direction of the bridge deck. The length direction of the semi-I-beams 1 is arranged along the transverse direction of the bridge deck. The longitudinal steel bars 6 of the vertical and horizontal steel bar mesh 4 are fixed in the card slots 9, and the transverse steel bars 5 of the vertical and horizontal steel bar mesh 4 are tied on the upper layer of the longitudinal steel bars 6.

[0036] The thickness of the bridge deck body 3 of the trestle in this application is 50 - 60 mm. At the same time, an anti-corrosion coating is evenly applied to the bridge deck body 3 and its bottom, and the thickness of the anti-corrosion coating is 0.3 - 0.5 mm.

[0037] As Figure 1 shown in the figure, only a trestle with three semi-I-beams 1 arranged side by side is schematically shown in the figure. This application is not limited to the number of semi-I-beams 1 and the length of the trestle, which can be determined according to the actual situation. Specific Embodiment 2:

[0039] The construction method of the semi-I-beam - UHPC composite trestle bridge deck as described above includes the following steps:

[0040] S1: As Figure 3 shown in the figure, a plurality of semi-I-beams 1 are erected and arranged side by side at equal intervals along the longitudinal direction of the bridge deck. The length direction of the semi-I-beams 1 is arranged along the transverse direction of the bridge deck;

[0041] S2: A bottom pouring formwork (not shown in the figure) is supported between two adjacent semi-I-beams 2, and the top of the bottom pouring formwork is lower than the card slots 7 of the semi-I-shaped.

[0042] S3: As Figure 5 shown in the figure, a vertical and horizontal steel bar mesh 4 is arranged above the bottom pouring formwork. The longitudinal steel bars 6 of the vertical and horizontal steel bar mesh 4 are fixed in the card slots 7, and the transverse steel bars 5 of the vertical and horizontal steel bar mesh 4 are tied on the upper layer of the longitudinal steel bars 6;

[0043] S4: As shown in Figure 4 Figure [not provided], side steel plates 2 are arranged around the longitudinal and transverse steel bar mesh 4. The four side steel plates 2 are welded end to end with each other and welded to the semi-I-shaped steel 1. The ends of the longitudinal steel bars 6 and the transverse steel bars 5 are welded to the side steel plates 2. The four side steel plates 2 and the bottom casting formwork enclose each other to form a bridge deck casting formwork;

[0044] S5: As shown in Figure 6 Figure [not provided], UHPC concrete layer is poured into the bridge deck casting formwork to form the bridge deck body 3. After the bridge deck body 3 solidifies, the bottom casting formwork is removed to complete the prefabrication.

[0045] In step S3, when arranging the longitudinal and transverse steel bar mesh 4, first place the longitudinal steel bars 6 one by one into the card slots 7 and perform spot welding at the positions of the card slots 7 to connect them into one body; after the longitudinal steel bars 6 are laid, lay the transverse steel bars 5 on them, and the intersections of the transverse steel bars 5 and the longitudinal steel bars 6 are tied with steel wires.

[0046] In step S5, after removing the bottom casting formwork, clean and repair the surface of the bridge deck body 3, and apply an anti-corrosion coating to it.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A semi-I-beam - UHPC composite trestle bridge deck, characterized in that, It includes a support part formed by arranging multiple semi-I-shaped steel bars side by side. The semi-I-shaped steel bar includes a bottom plate, on which a vertical web is integrally formed. At the top of the vertical web, a plurality of upward-opening card slots are evenly distributed. A vertical and horizontal steel bar mesh is laid on the support part, and part of the steel bars of the vertical and horizontal steel bar mesh are correspondingly fixed in the card slots. A UHPC concrete layer is poured on the vertical and horizontal steel bar mesh to form a bridge deck body.

2. The semi-I-beam - UHPC composite trestle bridge deck according to claim 1, characterized in that, Side steel plates are provided on the four peripheries of the vertical and horizontal steel bar mesh. The side steel plates are welded to the semi-I-shaped steel bars. The ends of the longitudinal and transverse steel bars of the vertical and horizontal steel bar mesh are welded to the side steel plates. The side steel plates are attached to the periphery of the bridge deck body.

3. The semi-I-beam - UHPC composite trestle bridge deck according to claim 1, characterized in that, The card slot is a dovetail slot, and the dovetail slot is embedded inside the bridge deck body.

4. The semi-I-beam - UHPC composite trestle bridge deck according to claim 1, wherein, Multiple semi-I-shaped steel bars are arranged side by side along the longitudinal direction of the bridge deck. The length direction of the semi-I-shaped steel bar is arranged along the transverse direction of the bridge deck. The longitudinal steel bars of the vertical and horizontal steel bar mesh are fixed in the card slots, and the transverse steel bars of the vertical and horizontal steel bar mesh are tied on the upper layer of the longitudinal steel bars.

5. The semi-I-beam - UHPC composite trestle bridge deck according to any one of claims 1 to 4, characterized in that, The thickness of the bridge deck body is 50 - 60 mm.

6. The semi-I-beam - UHPC composite trestle bridge deck according to any one of claims 1 to 4, characterized in that, An anti-corrosion coating is evenly applied to the bottom of the bridge deck body, and the thickness of the anti-corrosion coating is 0.3 - 0.5 mm.

7. A construction method of a semi-I-beam - UHPC composite trestle bridge deck according to any one of claims 1 to 6, characterized in that, It includes the following steps: S1: Erect multiple semi-I-shaped steel bars and arrange them side by side at equal intervals along the longitudinal direction of the bridge deck. The length direction of the semi-I-shaped steel bar is arranged along the transverse direction of the bridge deck. S2: Support and pour a bottom formwork between two adjacent semi-I-shaped steel bars. The top of the bottom formwork is lower than the card slot of the semi-I-shaped steel bar. S3: Arrange a vertical and horizontal steel bar mesh above the bottom formwork. The longitudinal steel bars of the vertical and horizontal steel bar mesh are fixed in the card slots, and the transverse steel bars of the vertical and horizontal steel bar mesh are tied on the upper layer of the longitudinal steel bars. S4: Set side steel plates around the vertical and horizontal steel bar mesh, weld the four side steel plates to each other end to end and weld them to the semi-I-shaped steel bars. The ends of the longitudinal and transverse steel bars are welded to the side steel plates. The four side steel plates and the bottom formwork enclose each other to form a bridge deck pouring formwork. S5: Pour a UHPC concrete layer into the bridge deck pouring formwork to form a bridge deck body. After the bridge deck body solidifies, remove the bottom formwork to complete the prefabrication.

8. The construction method of the semi-I-beam - UHPC composite trestle bridge deck according to claim 7, characterized in that, In step S3, when arranging the vertical and horizontal steel bar mesh, first place the longitudinal steel bars one by one in the card slots and perform spot welding at the card slot positions to connect them into one body. After the longitudinal steel bars are laid, lay the transverse steel bars on them, and tie the intersections of the transverse steel bars and the longitudinal steel bars with steel wires.

9. The construction method of the semi-I-shaped steel-UHPC composite trestle bridge deck according to claim 7, characterized in that, In step S5, after removing the bottom formwork, clean and repair the surface of the bridge deck body, and apply an anti-corrosion layer to it.

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