A construction method for explosion-resistant and rapid-repair composite bridge deck

Abstract

The present invention relates to a construction method for explosion-resistant and rapidly repairable composite bridge decks, belonging to the fields of transportation technology and bridge engineering protection. The bridge deck modules employed in the construction method for explosion-resistant and rapidly repairable composite bridge decks of the present invention employ two structural types: Type 1: shear connectors are arranged on an orthotropic steel plate (1) coated with an explosion-proof coating and an anti-corrosion paint, protective material is applied and poured from the bottom up on the orthotropic steel plate panel, and a concrete layer (3) and explosion-proof paint are poured; Type 2: a two-layer orthotropic steel plate panel coated with an explosion-proof coating and an anti-corrosion paint is constructed, with shear connectors arranged oppositely between the two layers, a concrete layer poured between the two layers, and an explosion-proof paint applied to the top surface of the upper orthotropic steel plate. In both types, the bridge deck modules are positioned according to their position within the beam grid; bolts are used to quickly secure and assemble the bridge deck modules to the longitudinal and transverse beam grids; wet joints formed between adjacent longitudinal or transverse bridge decks are cast, and the entire bridge deck is subsequently waterproofed and paved with asphalt. The composite bridge deck proposed in this invention features high explosion resistance, modular production, mechanized construction, and ease of rapid repair after explosions. The composite bridge deck utilizes a single or multiple layers of explosion-proof coating and protective materials, giving it enhanced impact resistance, energy absorption, and explosion resistance.

Description

Technical Field

[0001] The invention relates to a construction method for explosion-resistant and quick-repair composite bridge deck, belonging to the technical field of transportation and the field of bridge engineering protection. Background Art

[0002] Bridge structures are critical components of transportation lifelines, and bridge decks bear the brunt of explosions. Therefore, researching a novel explosion-resistant and rapidly repairable bridge deck has both theoretical and practical engineering value for improving existing design concepts and enhancing the comprehensive safety and disaster prevention capabilities of transportation infrastructure.

[0003] The longitudinal and transverse beam grid system, composed of steel beams and deck panels that intersect longitudinally and transversely, is widely used in cable-stayed and tied-arch bridges due to its excellent load-bearing properties, ease of construction, and low cost. This structure primarily utilizes towers and arch ribs as load-bearing components, with stay cables and hangers (rigid or flexible) supporting the dead and live loads transmitted from the transverse beams. The deck panels are all standardized, factory-prefabricated, and all longitudinal and transverse beams feature wetted joints.

[0004] Applications No. 201510946264.0 and No. 201810098694.5 disclose, respectively, a steel box girder bridge deck pavement structure with explosion-resistant properties and a steel bridge deck pavement structure and installation method that is explosion-proof and impact-resistant. While both utilize protective materials to protect the structures, neither addresses the difficulty of rapidly repairing and replacing the bridge deck after damage from blast loads. Furthermore, neither considers standardized factory prefabrication, rapid on-site replacement, or mechanized installation of the bridge deck. Summary of the Invention

[0005] In view of the above problems, the present invention provides a construction method for explosion-resistant and fast-repairing composite bridge deck, which can withstand explosion effects and solve the problem of local stress concentration.

[0006] The present invention adopts the following technical solutions:

[0007] The present invention provides a construction method for a blast-resistant and rapid-repair composite bridge deck, and a method for preparing a bridge deck module is as follows:

[0008] Step 1: Welding a flat steel plate and stiffening ribs to form an orthotropic steel plate;

[0009] Step 2: Welding shear connectors on the orthotropic steel plates;

[0010] Step 3: Select ordinary concrete, fiber concrete or UHPC concrete according to the project design;

[0011] Step 4: Set up steel formwork around the upper part of the orthotropic steel plate and apply protective material on the flat steel plate; then pour the ordinary concrete, fiber concrete or UHPC concrete selected in step 3 into the set up steel formwork and perform steam curing;

[0012] Step 5: After the curing is completed, apply explosion-proof paint on the top surface of the concrete layer to form a bridge deck module;

[0013] The bridge uses a grid structure of crossbeams and longitudinal beams that are interlaced and fixed to each other. The steps for installing the bridge deck modules into the grid are as follows:

[0014] Step 6: Place the bridge deck modules according to their positions in the beam grid; bolts are used to quickly secure and assemble the bridge deck modules to the longitudinal and transverse beam grids;

[0015] Step 7: The wet joints formed between the longitudinally or transversely adjacent bridge decks are treated by pouring, and then the entire bridge deck is waterproofed and paved with asphalt pavement.

[0016] As another construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention, the preparation method of the bridge deck module is as follows:

[0017] Step 1: Welding a flat steel plate and stiffening ribs to form an orthotropic steel plate;

[0018] Step 2: Welding shear connectors on the orthotropic steel plates;

[0019] Step 3: Select ordinary concrete, fiber concrete or UHPC concrete according to the project design;

[0020] Step 4: Select another flat steel plate and weld the shear connector on the flat steel plate to form a shear member flat steel plate;

[0021] Step 5: Apply protective material to the flat steel plate of the orthotropic steel plate prepared in step 2; and set up steel formwork around the upper part of the orthotropic steel plate, and lay the shear member flat steel plate on the steel formwork. At this time, the shear connectors of the shear member flat steel plate are arranged relative to the shear connectors on the orthotropic steel plate, and the orthotropic steel plate, the shear member flat steel plate and the steel formwork form a closed casting space;

[0022] Step 6: pouring the ordinary concrete, fiber concrete or UHPC concrete selected in step 3 into the pouring space of the erected steel formwork to form a concrete layer, and curing the poured concrete;

[0023] Step 7: After the curing step is completed, apply explosion-proof paint on the top section of the concrete layer to form a bridge deck module;

[0024] The bridge uses a grid structure of crossbeams and longitudinal beams that are interlaced and fixed to each other. The steps for installing the bridge deck modules into the grid are as follows:

[0025] Step 8: Place the bridge deck modules according to their positions in the beam grid; bolts are used to quickly secure and assemble the bridge deck modules to the longitudinal and transverse beam grids;

[0026] Step 9: The wet joints formed between the longitudinally or transversely adjacent bridge decks are treated by pouring, and then the entire bridge deck is waterproofed and paved with asphalt pavement.

[0027] In the construction method of the explosion-resistant and rapid repair composite bridge deck described in the present invention, the stiffening ribs are open ribs or U-shaped stiffening ribs; the shear connectors are bolt shear connectors or PBL shear connectors or bolt and PBL combination shear connectors; the protective material types are ACF, foamed aluminum, foamed titanium, nylon carbon fiber composite materials, and fiber cement materials; the explosion-proof coating types are FORD-ONE ultra-tough protective coating, explosion-proof coating polyurea, and Bapton explosion-proof coating; the explosion-facing surface and the back explosion surface of the bridge deck module adopt explosion-proof coating polyurea.

[0028] In the construction method of the explosion-resistant and rapid-repair composite bridge deck of the present invention, the protective material and the orthotropic steel plate are bonded with an adhesive.

[0029] In the construction method of the explosion-resistant and rapid-repair composite bridge deck described in the present invention, the upper end surface of the flat steel plate of the orthotropic steel plate is first coated with protective material, and installation holes are reserved for the locations where shear connectors are installed.

[0030] In the construction method of the explosion-resistant and rapid-repair composite bridge deck described in the present invention, shear connectors and wire mesh are reserved on the beam grid structure in which the cross beams and longitudinal beams are interlaced and fixed to each other; and different bridge deck modules are formed into an integral whole using cast-in-place UHPC.

[0031] In the construction method of the explosion-resistant and rapid-repair composite bridge deck described in the present invention, a bottom groove structure for inserting stiffening ribs is provided in the longitudinal and transverse beam grids.

[0032] In the construction method of the explosion-resistant and rapid-repair composite bridge deck described in the present invention, the flat steel plate of the shear member is provided with a protective material coated on the end surface of the shear member.

[0033] In the construction method of the explosion-resistant and rapid repair composite bridge deck described in the present invention, in step five, the three-sided formwork is enclosed between the flat steel plate of the shear member and the orthotropic steel plate, and the side not enclosed by the formwork is a pouring port for pouring concrete; after the concrete pouring is completed, it is vibrated and the pouring port is sealed with a formwork. Beneficial effects

[0034] The composite bridge deck proposed by the present invention has high explosion-proof strength, modular production, mechanized construction and is convenient for rapid repair after explosion.

[0035] The composite bridge deck proposed by the present invention adopts a single layer or multiple layers of explosion-proof coating and protective materials, so that the composite bridge deck has stronger impact resistance, energy absorption and explosion resistance effects.

[0036] The present invention can solve the technical problem of low cracking capacity of bridge deck in negative bending moment area by adding steel wire mesh in the negative bending moment area. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the bridge deck module structure in the construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention;

[0038] Figure 2 This is a schematic diagram of another bridge deck module structure in the construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention;

[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of the bridge deck module and the longitudinal and transverse beam grid in the construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention;

[0040] Figure 4 The invention relates to the application of the construction method of the explosion-proof and rapid repair composite bridge deck in longitudinal and transverse beam grids. DETAILED DESCRIPTION

[0041] To make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments.

[0042] The bridge deck modules used in the construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention adopt two structural types:

[0043] Type 1: Shear connectors 2 are arranged on the orthotropic steel plate 1 panel coated with explosion-proof coating and anti-corrosion coating, protective material 4 is painted and poured from bottom to top on the orthotropic steel plate 1 panel, and a concrete layer 3 and explosion-proof coating 5 are poured;

[0044] Type 2: Orthotropic steel plate with explosion-proof coating and anti-corrosion coating. The panel is two layers.

[0045] Two layers of orthotropic steel plates 1 are provided with oppositely disposed shear connectors 2 , a concrete layer 3 is poured between the two layers of orthotropic steel plates 1 , and the top surface of the upper orthotropic steel plate 1 is coated with explosion-proof paint 5 .

[0046] The construction method of the explosion-proof and rapid repair composite bridge deck of the present invention comprises the following steps: the stiffening ribs are open ribs 11 or U-shaped stiffening ribs 12; the shear connectors 2 are bolt shear connectors or PBL shear connectors or a combination of bolts and PBL shear connectors; the protective material types are ACF, foamed aluminum, foamed titanium, nylon carbon fiber composite material, and fiber cement material; the explosion-proof coating types are FORD-ONE ultra-tough protective coating, explosion-proof polyurea coating, and Baptton explosion-proof coating;

[0047] The protective material is bonded to the orthotropic steel plate 1 using an adhesive. The upper end of the flat steel plate of the orthotropic steel plate 1 is first coated with protective material, and installation holes are reserved for the shear connectors 2. Shear connectors and wire mesh are reserved for the crossbeams and longitudinal beams that interlock and secure each other. Cast-in-place UHPC is used to integrate the different bridge deck modules. Bottom channels for inserting stiffening ribs are provided within the crossbeam grid. The ends of the shear member flat steel plates, where the shear members are located, are coated with protective material 4.

[0048] The construction method of the explosion-resistant and rapid repair composite bridge deck of the present invention

[0049] Step S1: The orthotropic steel plate 1 is welded by flat steel plates and stiffening ribs;

[0050] Step S2: spraying explosion-proof coating and anti-corrosion coating on the orthotropic steel plate;

[0051] Step S3: welding shear connectors on the orthotropic steel plates;

[0052] Step S4: Process the protective material according to the form and size of the shear connector and reserve corresponding cavities;

[0053] Step S5: applying adhesive on the orthotropic steel plate;

[0054] Step S6: bonding the protective material to the orthotropic steel plate;

[0055] Step S7: Select different steel-UHPC-protective material composite panels or double-layer steel-UHPC-protective material composite panels according to the strategic position, importance, and explosion resistance requirements of the bridge;

[0056] Step S8: When the composite panel type 1 is selected, a steel formwork is set up around the upper portion of the orthotropic steel plate, UHPC is poured, steam cured to achieve the corresponding strength requirements, and explosion-proof coating is sprayed;

[0057] Step S9: When composite panel type 2 is selected, weld and bond the upper layer coated with explosion-proof coating and anti-corrosion paint, shear connectors, and protective materials in the same manner as steps 1-6. Set up steel formwork on the three sides of the composite panel, with the side without steel formwork facing upward to facilitate pouring UHPC and vibrating. Simultaneously, steam curing is performed to achieve the required strength.

[0058] Step S10: With respect to step S2 and step S9, different explosion-proof coatings are selected for the explosion-facing surface and the back explosion surface of the composite panel.

[0059] Step S11: For steps 8 and 9, a cavity should be reserved in the modular composite plate to facilitate connection with the longitudinal and transverse beams;

[0060] Step S12: transport the modular composite panels to the site and fix them to the longitudinal and transverse beams with bolts.

[0061] Step S13: Shear connectors and wire meshes must be pre-welded on the longitudinal and transverse beams.

[0062] Step S14: pouring UHPC and performing steam curing;

[0063] Step S15: After the overall strength requirement is reached, the entire bridge deck is waterproofed (with waterproof membrane and waterproof coating) and paved with asphalt.

[0064] Step S16: When the bridge deck is damaged by the blast load, the specific damaged area of ​​the bridge deck is determined according to the specific conditions on site, the wet joints at the longitudinal and transverse beams in the corresponding area are chiseled out, and the modular composite bridge deck is replaced. After replacement, the wire mesh is laid and the UHPC is poured to continue to form the whole.

[0065] This new composite bridge deck is composed of steel, UHPC, shear connectors, protective materials, and protective coatings. Protective materials include ACF, aluminum foam, titanium foam, nylon carbon fiber composite, and fiber cement; and explosion-proof coatings include Ford-One Ultra-Tough Protective Coating, explosion-resistant polyurea, and Bapton explosion-proof coating. Furthermore, this bridge deck features standardized design, factory prefabrication, rapid replacement, and mechanized installation, facilitating rapid transit during both wartime and daily operations.

[0066] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A construction method for explosion-resistant and rapid repair composite bridge deck, characterized by: The preparation method of the bridge deck module is as follows: Step 1: Welding a flat steel plate and stiffening ribs to form an orthotropic steel plate (1); Step 2: Welding the shear connector (2) onto the orthotropic steel plate (1); Step 3: Select ordinary concrete, fiber concrete or UHPC concrete according to the project design; Step 4: Set up steel formwork around the upper part of the orthotropic steel plate (1), and apply protective material (4) on the flat steel plate; then pour the ordinary concrete, fiber concrete or UHPC concrete selected in step 3 into the set up steel formwork, and perform steam curing; Step 5: After the curing step is completed, the top surface of the concrete layer (3) is painted with explosion-proof coating (5) to form a bridge deck module; The bridge adopts a plurality of beam grid structures (6) formed by interlacing and fixing the cross beams and longitudinal beams. The steps of assembling the bridge deck module into the beam grid are as follows: Step 6: Place the bridge deck modules according to their positions in the beam grid; bolts are used to quickly secure and assemble the bridge deck modules to the longitudinal and transverse beam grids; Step 7: The wet joints formed between the longitudinally or transversely adjacent bridge decks are treated by pouring, and then the entire bridge deck is waterproofed and paved with asphalt pavement.

2. A construction method for explosion-resistant and rapid repair composite bridge deck, characterized by: The preparation method of the bridge deck module is as follows: Step 1: Welding a flat steel plate and stiffening ribs to form an orthotropic steel plate (1); Step 2: Welding the shear connector (2) onto the orthotropic steel plate (1); Step 3: Select ordinary concrete, fiber concrete or UHPC concrete according to the project design; Step 4: Select another flat steel plate and weld the shear connector (2) on the flat steel plate to form a shear member flat steel plate (21); Step 5: Apply protective material (4) on the flat steel plate of the orthotropic steel plate (1) prepared in step 2; and set up steel templates around the upper part of the orthotropic steel plate (1), and lay the shear member flat steel plate on the steel template. At this time, the shear connector (2) of the shear member flat steel plate (21) and the shear connector (2) on the orthotropic steel plate (1) are arranged relative to each other, and the orthotropic steel plate (1), the shear member flat steel plate and the steel template form a closed casting space; Step 6: pouring the ordinary concrete, fiber concrete or UHPC concrete selected in step 3 into the pouring space of the erected steel formwork to form a concrete layer (3), and curing the poured concrete; Step 7: After the curing step is completed, an explosion-proof coating (5) is applied to the top surface of the concrete layer (3) to form a bridge deck module; The bridge adopts a plurality of beam grid structures (6) formed by interlacing and fixing the cross beams and longitudinal beams. The steps of assembling the bridge deck module into the beam grid are as follows: Step 8: Place the bridge deck modules according to their positions in the beam grid; bolts are used to quickly secure and assemble the bridge deck modules to the longitudinal and transverse beam grids; Step 9: The wet joints formed between the longitudinally or transversely adjacent bridge decks are treated by pouring, and then the entire bridge deck is waterproofed and paved with asphalt pavement.

3. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 1 or 2, characterized in that: The stiffening ribs are open ribs (11) or U-shaped stiffening ribs (12); The shear connector (2) is a bolt shear connector or a PBL shear connector or a bolt and PBL combined shear connector; The types of protective materials are ACF, foamed aluminum, foamed titanium, nylon carbon fiber composite material, and fiber cement material; The types of explosion-proof coatings are FORD-ONE super-tough protective coating, explosion-proof coating polyurea, and Bapton explosion-proof coating; The explosion-facing and explosion-reverse surfaces of the bridge deck module are made of explosion-resistant polyurea coating.

4. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 1 or 2, characterized in that: The protective material and the orthotropic steel plate (1) are bonded together by an adhesive.

5. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 1 or 2, characterized in that: The upper end surface of the flat steel plate of the orthotropic steel plate (1) is first coated with a protective material, and a mounting hole is reserved at a location for mounting the shear connector (2).

6. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 1 or 2, characterized in that: Shear connectors and wire mesh are reserved on the beam grid structure where the crossbeams and longitudinal beams are intertwined and fixed to each other; cast-in-place UHPC is used to form different bridge deck modules into a whole.

7. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 1 or 2, characterized in that: A bottom groove structure for inserting stiffening ribs is provided in the longitudinal and transverse beam grids.

8. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 2 is characterized by: The shear member flat steel plate is provided with a protective material (4) applied to the end surface of the shear member.

9. The construction method of the explosion-resistant and rapid repair composite bridge deck according to claim 2, characterized in that: In step 5, the three-sided template between the shear member flat steel plate (21) and the orthotropic steel plate (1) is enclosed, and the side of the template not enclosed is a pouring port for pouring concrete (3); After the concrete (3) is poured, it is vibrated and the pouring opening is sealed with a formwork.

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