A steel bridge deck pavement substructure and construction method suitable for heavy traffic

Abstract

This invention discloses a steel bridge deck pavement underlay structure and construction method suitable for heavy traffic, relating to the field of bridge engineering. A stiff fiber reinforcing strip and fiber grid are installed at the bottom of the steel bridge deck pavement structure. Epoxy resin in the epoxy crushed stone layer fills the epoxy resin filling holes, and epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the mesh of the stiff fiber reinforcing strip. This significantly enhances the flexural tensile strength and flexural fatigue resistance of the pavement structure bottom, and improves the shear strength between the bottom of the steel bridge deck pavement structure and the steel plate, effectively preventing overall shear delamination failure of the steel bridge deck pavement bottom under heavy traffic.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, and in particular to a steel bridge deck pavement substructure and construction method suitable for heavy traffic. Background Technology

[0002] The durability of steel bridge deck pavement under heavy traffic conditions has long been a problem for the road and bridge engineering community. Under heavy traffic, the bottom structure of steel bridge deck pavement is subjected to bending and tensile fatigue, and fatigue cracking is likely to occur at the bottom. In addition, the shear force between the steel bridge deck pavement and the steel bridge deck is large, which can easily cause the bonding failure of the bottom structure of the steel bridge deck pavement and overall delamination.

[0003] Currently, most steel bridge deck pavement structures rely on the chemical properties of their underlying bonding materials to provide adhesion and resist shear forces at the bottom; while the flexural fatigue at the bottom is mostly resisted solely by the mechanical properties of asphalt or epoxy resin materials. Taking the composite steel bridge deck pavement structure implemented by Guangzhou Pearl River Huangpu Bridge Construction Co., Ltd. as an example, both the shear forces and flexural fatigue at the bottom are resisted by the chemical and physical-mechanical properties of the epoxy resin material in the epoxy crushed stone layer. From the implementation experience, the composite steel bridge deck pavement structure performed well in the overtaking lane (mainly for passenger cars), and after 8 years of use, the pavement structure was in good condition with no obvious defects. However, in the slow lane (mainly for heavy vehicles), after about 5-6 years of use, the pavement structure showed more serious bottom delamination and potholes caused by fatigue cracking. Summary of the Invention

[0004] The purpose of this invention is to provide a steel bridge deck pavement underlay structure and construction method suitable for heavy traffic, so as to overcome the problems of bottom cracking and delamination of steel bridge deck pavement structure under bending and tensile fatigue under heavy traffic.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A steel bridge deck pavement underlay structure suitable for heavy traffic includes: a steel bridge deck, an epoxy resin bonding layer, stiff fiber reinforcing strips, fiber grids, and an epoxy crushed stone layer;

[0007] An epoxy resin adhesive layer is applied to the steel bridge deck;

[0008] The rigid fiber reinforcing strips are laid on the epoxy resin bonding layer and connected to the steel bridge deck by anchor bolts;

[0009] Fiber grids are laid on stiff fiber reinforcing strips;

[0010] The stiff fiber reinforcing strip is in the form of a mesh, and epoxy resin filling holes are provided on the stiff fiber reinforcing strip;

[0011] An epoxy crushed stone layer is spread on the fiber grid, and the epoxy resin in the epoxy crushed stone layer fills the epoxy resin filling holes. The epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the grid of the stiff fiber reinforcing strips.

[0012] A construction method for the substructure of steel bridge deck pavement suitable for heavy traffic includes:

[0013] An epoxy resin bonding layer is laid on the steel bridge deck;

[0014] Before the epoxy resin adhesive layer cures, rigid fiber reinforcing strips are laid, and the anchor bolts on the steel bridge deck are passed through the anchor bolt holes on the rigid fiber reinforcing strips to anchor and bond the fiber reinforcing strips to the steel bridge deck.

[0015] Fiber grids are laid on stiff fiber reinforcing strips;

[0016] An epoxy crushed stone layer is laid on the fiber grid, and the epoxy resin in the epoxy crushed stone layer completely fills the epoxy resin filling holes on the stiff fiber reinforcing strip. The epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the grid of the stiff fiber reinforcing strip.

[0017] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0018] This invention discloses a bottom layer structure and construction method for steel bridge deck pavement suitable for heavy traffic. A stiff fiber reinforcing strip and fiber grid are installed at the bottom of the steel bridge deck pavement structure. Epoxy resin in the epoxy crushed stone layer fills the epoxy resin filling holes, and epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the mesh of the stiff fiber reinforcing strip. This significantly enhances the flexural tensile strength and flexural fatigue resistance of the bottom of the pavement structure, and improves the shear strength between the bottom of the steel bridge deck pavement structure and the steel plate, effectively preventing overall shear delamination failure of the bottom of the steel bridge deck pavement under heavy traffic. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a steel bridge deck pavement substructure suitable for heavy traffic, provided as an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a stiffening fiber reinforcing strip provided in an embodiment of the present invention;

[0022] Figure 3 A flowchart illustrating a construction method for a steel bridge deck pavement substructure suitable for heavy traffic, provided in an embodiment of the present invention.

[0023] Symbol explanation: 1 Steel bridge deck, 1-1 Anchor bolt, 2 Epoxy resin bonding layer, 3 Reinforcing fiber strip, 3-1 Main reinforcing fiber strip in the longitudinal direction, 3-2 Transverse reinforcing fiber strip, 3-3 Secondary reinforcing fiber strip in the longitudinal direction, 3-4 Epoxy resin filling hole, 3-5 Anchor bolt hole, 4 Fiber grid, 5 Epoxy crushed stone layer, 5-1 Epoxy resin, 5-2 Crushed stone. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a steel bridge deck pavement underlay structure and construction method suitable for heavy traffic, so as to overcome the problems of bottom cracking and delamination of steel bridge deck pavement structure under bending and tensile fatigue under heavy traffic.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Based on the analysis of the stress characteristics of the bottom layer of steel bridge deck pavement, this invention makes full use of the mechanical properties of fiber composite materials and proposes a bottom layer structure for steel bridge deck pavement suitable for heavy traffic and its construction method.

[0028] This invention provides a steel bridge deck pavement substructure suitable for heavy traffic, such as... Figure 1 As shown, it includes: a steel bridge deck 1, an epoxy resin adhesive layer 2, a rigid fiber reinforcing strip 3, a fiber grid 4, and an epoxy crushed stone layer 5.

[0029] An epoxy resin bonding layer 2 is applied to the steel bridge deck 1. Reinforcing fiber strips 3 are laid on the epoxy resin bonding layer 2 and connected to the steel bridge deck 1 via anchor bolts 1-1. A fiber grid 4 is laid on the reinforcing fiber strips 3. The reinforcing fiber strips 3 are mesh-like and have epoxy resin filling holes 3-4. An epoxy crushed stone layer 5 is spread on the fiber grid 4, with epoxy resin 5-1 filling the epoxy resin filling holes 3-4, and epoxy resin 5-1 and crushed stone 5-2 filling the mesh of the fiber grid 4 and the grid of the reinforcing fiber strips 3.

[0030] Reference Figure 2 The stiffening fiber reinforcing strip 3 includes: two longitudinal bridging primary stiffening fiber reinforcing strips 3-1, multiple longitudinal bridging secondary stiffening fiber reinforcing strips 3-3, and multiple transverse bridging stiffening fiber reinforcing strips 3-2.

[0031] Two longitudinal primary stiffening fiber reinforcing strips 3-1 are respectively installed at the wheel load positions along the driving direction. The vehicle wheels are on both sides, and one longitudinal primary stiffening fiber reinforcing strip 3-1 is installed on the epoxy resin adhesive layer 2 corresponding to the wheel load position on one side. Multiple transverse stiffening fiber reinforcing strips 3-2 are sequentially spaced apart in the direction perpendicular to the longitudinal primary stiffening fiber reinforcing strips 3-1, and each transverse stiffening fiber reinforcing strip 3-2 is connected to two longitudinal primary stiffening fiber reinforcing strips 3-1. Multiple longitudinal secondary stiffening fiber reinforcing strips 3-3 are spaced apart between adjacent transverse stiffening fiber reinforcing strips 3-2, and each longitudinal secondary stiffening fiber reinforcing strip 3-3 is arranged parallel to the longitudinal primary stiffening fiber reinforcing strips 3-1.

[0032] As a preferred embodiment, the stiffening fiber reinforcement strip 3 is a carbon fiber plate with a thickness ranging from 2mm to 5mm. The width of the longitudinal bridging primary stiffening fiber reinforcement strip 3-1 ranges from 15cm to 30cm. The width of the longitudinal bridging secondary stiffening fiber reinforcement strip 3-3 ranges from 10cm to 15cm. The width of the transverse bridging stiffening fiber reinforcement strip 3-2 ranges from 10cm to 15cm.

[0033] The rigid fiber reinforcing strip 3 is provided with anchor bolt holes 3-5. Multiple anchor bolts 1-1 are welded onto the steel bridge deck, and the anchor bolts 1-1 are matched with the anchor bolt holes 3-5. The multiple anchor bolts 1-1 are inserted one-to-one into the multiple anchor bolt holes 3-5, anchoring and bonding the rigid fiber reinforcing strip 3 to the steel bridge deck 1. Figure 2 As shown, the anchor bolt holes 3-5 and epoxy resin filling holes 3-4 are spaced apart.

[0034] The stiff fiber reinforcing strip 3 is used to enhance the flexural strength and flexural fatigue resistance of the bottom composite fiber epoxy crushed stone layer 5 of the steel bridge deck pavement structure. At the same time, it physically divides the epoxy crushed stone into blocks, effectively improving the shear resistance between the epoxy crushed stone and the steel plate.

[0035] For example, the fiber grid 4 is a carbon fiber grid 4, a basalt fiber grid 4, or a glass fiber grid 4. The mesh of the fiber grid 4 is square, and the side length of the square ranges from 15mm to 30mm, so as to ensure that crushed stone particles 5-2 can be embedded in the mesh.

[0036] The fiber grid 4 physically reinforces and divides the epoxy crushed stone, which on the one hand improves the overall flexural strength and flexural fatigue resistance of the composite fiber epoxy crushed stone layer 5, and on the other hand, bonds the rigid fiber reinforced strip-shaped epoxy crushed stone into a whole.

[0037] In the epoxy crushed stone layer 5 without stiffening fiber reinforcing strips and fiber grid 4, the shear resistance of the steel bridge deck pavement underlayer is resisted solely by the chemical bonding properties of epoxy resin 5-1. However, after the stiffening fiber reinforcing strips are installed, the shear resistance of the steel bridge deck pavement underlayer is significantly improved. In addition to the shear resistance provided by the chemical bonding properties of epoxy resin 5-1, the physical and mechanical interlocking between the stiffening fiber reinforcing strips anchored to the steel plate and the epoxy crushed stone (including the physical and mechanical interlocking between epoxy resin 5-1 in the filling holes and the stiffening fiber reinforcing strips) can also provide shear resistance.

[0038] In the epoxy crushed stone layer 5 without stiffening fiber reinforcing strips and fiber grid 4, the bottom epoxy crushed stone alone bears the bending and tensile fatigue of heavy traffic. However, after the stiffening fiber reinforcing strips and fiber grid 4 are installed, the bending and tensile strength and bending and tensile fatigue resistance of the composite fiber epoxy crushed stone layer formed with the epoxy crushed stone are greatly improved due to the high bending and tensile strength of the stiffening fiber reinforcing strips and fiber grid 4.

[0039] This invention also provides a construction method for the substructure of steel bridge deck pavement suitable for heavy traffic, such as... Figure 3 As shown, it includes the following steps:

[0040] Step S1: Lay an epoxy resin adhesive layer 2 on the steel bridge deck 1.

[0041] Shot blasting process of steel bridge deck and welding of anchor bolts 1-1: Use a special shot blasting machine to shot blast the steel bridge deck 1 to Sa2.5 level and clean the dust and impurities on the surface of the steel plate; then weld anchor bolts 1-1 at the positions where stiff fiber reinforcing strips 3 need to be laid.

[0042] Construction of epoxy resin bonding layer 2: Apply 1-1.5 kg / m² of epoxy resin evenly to the steel bridge deck 1. 2 Epoxy resin 5-1 forms an epoxy resin adhesive layer 2.

[0043] Step S2: Before the epoxy resin adhesive layer 2 is cured, lay the stiff fiber reinforcing strip 3, and pass the anchor bolts 1-1 on the steel bridge deck 1 through the anchor bolt holes 3-5 on the stiff fiber reinforcing strip 3 to anchor and bond the fiber reinforcing strip to the steel bridge deck 1.

[0044] Step S3: Lay the fiber grid 4 on the stiff fiber reinforcing strip 3.

[0045] Step S4: Lay an epoxy crushed stone layer 5 on the fiber grid 4, and make the epoxy resin 5-1 in the epoxy crushed stone layer 5 completely fill the epoxy resin filling holes 3-4 on the stiff fiber reinforcing strip 3. The epoxy resin 5-1 and crushed stone 5-2 in the epoxy crushed stone layer 5 fill the mesh of the fiber grid 4 and the grid of the stiff fiber reinforcing strip 3.

[0046] Construction of the epoxy crushed stone layer 5. Spray the first layer of epoxy resin at a rate of 2-3 kg / m². 2 Control the dosage, then immediately spread the first layer of 3-5mm diameter crushed stone 5-2. If too much is applied, remove any unsecured crushed stone 5-2 with a broom and vacuum cleaner after the epoxy resin 5-1 has cured. Spread the second layer of epoxy resin at a rate of 2-3 kg / m². 2 Control the amount used, and then immediately spread the second layer of 3-5mm diameter crushed stone 5-2. If too much is spread, after the epoxy resin 5-1 has cured, use a broom and vacuum cleaner to remove the unstabilized crushed stone 5-2.

[0047] The crushed stone 5-2 at the top of the epoxy crushed stone layer 5 should protrude above the epoxy resin 5-1 to form a good rough surface, so as to ensure good interlayer shear resistance between the epoxy crushed stone layer 5 and the subsequent upper asphalt structural layer.

[0048] When applying the first and second layers of epoxy resin, the epoxy resin filling holes 3-4 on the reinforcing fiber strip 3 must be completely and densely filled. This ensures that the reinforcing fiber strip 3 and the epoxy resin aggregate 5-2 form a unified structure, enhancing the shear resistance.

[0049] In the first and second layers of epoxy resin, 2-5cm long basalt short fibers or steel fibers are uniformly incorporated at a dosage of 5‰-10‰.

[0050] This invention addresses the issue of flexural fatigue failure and overall delamination in the bottom layer of steel bridge deck pavement under heavy traffic loads. It proposes a bottom layer structure for steel bridge deck pavement suitable for heavy traffic and its control method. The beneficial effects of this invention are:

[0051] (1) The steel bridge deck pavement substructure and its construction method proposed in this invention are suitable for heavy traffic, with clear functions, simple construction process, and good applicability.

[0052] (2) This invention proposes for the first time to set stiff fiber reinforcing strips and fiber grids at the bottom of the steel bridge deck pavement structure, which on the one hand greatly enhances the bending tensile strength and bending fatigue resistance of the bottom of the pavement structure; on the other hand, it improves the shear strength of the bottom of the steel bridge deck pavement structure and the steel plate, effectively avoiding the overall shear delamination failure of the bottom of the steel bridge deck pavement under heavy traffic.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A steel bridge deck pavement substructure suitable for heavy traffic, characterized in that, include: Steel bridge deck, epoxy resin adhesive layer, stiff fiber reinforcing strips, fiber grid and epoxy crushed stone layer; An epoxy resin adhesive layer is applied to the steel bridge deck; The rigid fiber reinforcing strips are laid on the epoxy resin bonding layer and connected to the steel bridge deck by anchor bolts; Fiber grids are laid on stiff fiber reinforcing strips; The stiff fiber reinforcing strip is in the form of a mesh, and epoxy resin filling holes are provided on the stiff fiber reinforcing strip; The stiff fiber reinforcement strips are anchored and bonded to the steel bridge deck; The stiffening fiber reinforcing strip includes: two longitudinal bridging primary stiffening fiber reinforcing strips, multiple longitudinal bridging secondary stiffening fiber reinforcing strips, and multiple transverse bridging stiffening fiber reinforcing strips; Two longitudinal main stiffening fiber reinforcing strips are respectively installed at the wheel load positions along the driving direction; Multiple transverse stiffening fiber reinforcing strips are arranged sequentially at intervals in a direction perpendicular to the longitudinal main stiffening fiber reinforcing strips, and each transverse stiffening fiber reinforcing strip is connected to two longitudinal main stiffening fiber reinforcing strips; Multiple longitudinal secondary stiffening fiber reinforcing strips are spaced apart between adjacent transverse stiffening fiber reinforcing strips, and each longitudinal secondary stiffening fiber reinforcing strip is arranged parallel to the longitudinal primary stiffening fiber reinforcing strip. An epoxy crushed stone layer is spread on the fiber grid, and the epoxy resin in the epoxy crushed stone layer completely fills the epoxy resin filling holes. The epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the grid of the stiff fiber reinforcing strips.

2. The steel bridge deck pavement substructure suitable for heavy traffic as described in claim 1, characterized in that, The stiff fiber reinforcing strip is a carbon fiber plate with a thickness ranging from 2mm to 5mm; The width of the longitudinal bridging main stiffening fiber reinforcement strip ranges from 15cm to 30cm; The width of the longitudinal bridging secondary stiffening fiber reinforcement strip ranges from 10cm to 15cm; The width of the transverse stiffening fiber reinforcement strip ranges from 10cm to 15cm.

3. The steel bridge deck pavement substructure suitable for heavy traffic according to claim 1, characterized in that, The stiff fiber reinforcing strip is provided with multiple anchor bolt holes; Multiple anchor bolts are welded onto the steel bridge deck. The anchor bolts are matched with anchor bolt holes, and the multiple anchor bolts are inserted into the multiple anchor bolt holes one by one to anchor and bond the stiffening fiber reinforcement strip to the steel bridge deck.

4. The steel bridge deck pavement substructure suitable for heavy traffic as described in claim 1, characterized in that, The fiber grid is a carbon fiber grid, basalt fiber grid, or glass fiber grid; The side length of the mesh openings of the fiber grid ranges from 15mm to 30mm.

5. A construction method for the substructure of a steel bridge deck pavement suitable for heavy traffic, as described in any one of claims 1-4, characterized in that, include: An epoxy resin bonding layer is laid on the steel bridge deck; Before the epoxy resin adhesive layer cures, rigid fiber reinforcing strips are laid, and the anchor bolts on the steel bridge deck are passed through the anchor bolt holes on the rigid fiber reinforcing strips to anchor and bond the fiber reinforcing strips to the steel bridge deck. Fiber grids are laid on stiff fiber reinforcing strips; An epoxy crushed stone layer is laid on the fiber grid, and the epoxy resin in the epoxy crushed stone layer completely fills the epoxy resin filling holes on the stiff fiber reinforcing strip. The epoxy resin and crushed stone in the epoxy crushed stone layer fill the mesh of the fiber grid and the grid of the stiff fiber reinforcing strip.

6. The construction method for the substructure of steel bridge deck pavement suitable for heavy traffic as described in claim 5, characterized in that, The process of laying an epoxy resin bonding layer on the steel bridge deck specifically includes: The steel bridge deck was shot blasted to Sa2.5 level, and dust and impurities on the surface of the steel plate were cleaned. Weld anchor bolts onto the steel bridge deck; Evenly spread 1 kg / m² of the coating on the steel bridge deck. 2 -1.5kg / m 2 The epoxy resin forms an epoxy resin adhesive layer.

7. The construction method for the substructure of steel bridge deck pavement suitable for heavy traffic as described in claim 5, characterized in that, The laying of an epoxy crushed stone layer on the fiber grid specifically includes: Spread 2kg / m on the fiber grid 2 -3kg / m 2 The first layer of epoxy resin, and then a first layer of crushed stone with a particle size of 3mm-5mm is sprinkled in the first layer of epoxy resin; After the first layer of epoxy resin has cured, use a broom and vacuum cleaner to remove any loose gravel that has not been properly secured. Spread 2 kg / m² of gravel on the first layer of 3mm-5mm diameter crushed stone. 2 -3kg / m 2 The second layer of epoxy resin, and then a second layer of crushed stone with a particle size of 3mm-5mm is sprinkled in the second layer of epoxy resin; After the second layer of epoxy resin has cured, use a broom and vacuum cleaner to remove any loose gravel.

8. The construction method for the substructure of steel bridge deck pavement suitable for heavy traffic according to claim 7, characterized in that, Basalt short fibers or steel fibers with a length of 2cm-5cm are uniformly incorporated into the first layer of epoxy resin and the second layer of epoxy resin, with an incorporation amount of 5‰-10‰.

9. The construction method for the substructure of steel bridge deck pavement suitable for heavy traffic according to claim 7, characterized in that, The top of the epoxy crushed stone layer has protruding crushed stone, forming a rough surface.

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