Flood control type railway bridge reinforcing structure and construction method

Abstract

This invention belongs to the field of railway subgrade construction technology, specifically relating to a flood-resistant railway bridge reinforcement structure. It includes a frame bridge body, a raised section, and anchoring components. The frame bridge body is composed of multiple U-shaped frame bridge tubes connected together. The raised section includes reinforcement components and ballast. The reinforcement components include precast components and gabion cages filled with crushed stone, with coal gangue filling the outer side of the precast components. The anchoring components include H-beams and H-beams, both fixed to the left and right sides of the frame bridge body. Wire mesh is fixed to the inner wall of the H-beams. An enlarged head is welded to the bottom of the H-beams and fixed in the underwater soil. The H-beams are formed by welding two H-beams together. This invention can meet the requirements for preventing settlement and deformation of railway bridges in coal mining subsidence areas, as well as ensuring bridge stability and flood control under flood impact and flooding conditions. The structure is reliable, and the construction method is highly operable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of railway subgrade construction, and particularly relates to a flood-prevention type railway bridge reinforcing structure and a construction method. BACKGROUND

[0002] In railway natural disasters, water damage is the most destructive, and railway accidents caused by rain and floods occur from time to time, causing economic losses that are difficult to estimate. Uneven settlement also poses a great threat to railway bridges. When the settlement is too large, the following two methods are generally used: (1) changing the route to avoid the mining subsidence area and building a new railway outside the subsidence area, which requires secondary land acquisition, occupies a large amount of farmland, has a large investment, is cumbersome in approval work, and is not conducive to the development of the mining area economy because the original railway is abandoned. (2) maintaining the line operation by building a ballast retaining wall, and then building a new box body after the ground subsidence is basically stable and the settlement meets the required clearance for the construction of the new bridge body. Although this method can raise the road surface, it is not conducive to the water crossing of the entire railway bridge deck.

[0003] Through retrieval, a "mining area gabion structure railway embankment" (patent number CN201020176673.X) is disclosed in a Chinese patent, which raises the track by adding stone cages and intermediate ballast filling, preventing uneven settlement and causing the line to sink, and preventing bridge water accumulation. The stone cages on both sides are connected by tie bars to ensure the overall stability of the embankment, and the stone cages are connected by binding to ensure the overall straightness of the stone cages and meet the bearing capacity requirements. This patent considers both preventing settlement and bridge water accumulation, but does not consider the impact of excessive water volume on the bridge. In addition, this structure raises the single use of stone cages, the fixing method is simple, only considers the fixing of the raised part, and does not consider the overall situation of the bridge, which has insufficient stability and cannot effectively prevent floods.

[0004] In addition, a "double-layered H-shaped composite diaphragm wall anchor foundation and its construction method" (patent number CN202011277432.9) is disclosed in a Chinese patent, which sets a solid reinforced concrete between the H-shaped diaphragm walls, with the solid reinforced concrete located above the dry pouring bottom plate and the internal lattice diaphragm wall having a top plate, achieving the purpose of improving the friction coefficient and bearing capacity of the reinforced soil, underwater suction of soil in the compartment, water head difference-free construction inside and outside the pit, reducing construction risk, improving overall stability and vertical bearing capacity. However, this patent scheme focuses more on the improvement of the reinforcing capacity of the bridge through soil foundation reinforcement, which has a small application range and is not suitable for mining subsidence areas prone to settlement. Moreover, it does not reflect its effectiveness in flood prevention and cannot meet the water crossing capacity and stability of the bridge when the water volume is too large.

[0005] Therefore, there is an urgent need for a flood-resistant railway bridge reinforcement structure that can both raise the railway subgrade and meet the requirements for railway bridges to pass through water, and will not be destroyed by floods or flooding even in coal mining subsidence areas where settlement and deformation are prone to occur. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a flood-resistant railway bridge reinforcement structure and construction method.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] In a first aspect, embodiments of the present invention provide a flood-resistant railway bridge reinforcement structure, comprising a frame bridge body, an elevated section, and anchoring components. The frame bridge body is composed of multiple U-shaped frame bridge tubes connected together. The elevated section is located above the water surface and includes reinforcement components on the left and right sides above the frame bridge body, and ballast filling the space between the reinforcement components on both sides. The reinforcement components include prefabricated components and crushed stone gabions arranged sequentially from top to bottom, with coal gangue filling the outer side of the prefabricated components. Sleepers and rails are arranged above the ballast. The anchoring components include I-beams and H-beams, both of which are fixed to the left and right sides of the frame bridge body by anchor rods. Wire mesh is fixed to the inner wall of the I-beams for fixing the coal gangue and the elevated section. An enlarged head portion is welded to the bottom of the H-beams and fixed in the underwater soil. The H-beams are made of two H-beams welded together.

[0011] Optionally, the overall height of the precast component is not less than 1m. The precast component adopts an inverted T-shaped structure consisting of columns and bases. The length of the columns and bases is the same as the length of the frame bridge tube. The cross-section of the base is trapezoidal, with one side being the short side and the other side being the long side. The height of the short side is 10-20cm, and the height of the short side is lower than the height of the long side. The angle between the top surface of the base and the horizontal plane is 10-15°. The width of the bottom surface of the base is equal to the width of the crushed stone gabion. The columns are located above the base, and the distance from the bottom of the column to the short side is 2 / 3 of the width of the top surface of the base. The columns are inclined towards the long side of the base, and the angle between the columns and the horizontal plane is 70-75°.

[0012] Specifically, the inverted T-shaped prefabricated component can be prefabricated in advance, which is more convenient and fast during construction, and the structure is special, which can play a good role in flood prevention and stability, the column of the prefabricated component can bear the impact of the flood on the water side to protect the normal operation of the train on the track, and the filling of ballast in the inner space is also conducive to reducing the damage of the train dynamic load to the inverted T-shaped prefabricated component, and the outer side water side space is filled with coal gangue, which has good water permeability, and the outer side water side space is larger than the inner space, and the weight of the water flow is pressed on the bottom of the component, so that the inverted T-shaped prefabricated component is more stable.

[0013] In addition, the height of the short side is 10-20 cm, the angle between the top surface of the base and the horizontal plane is 10-15°, the angle between the column and the horizontal plane is 70-75°, and the connecting angle between the base and the column is a smooth arc fillet, the analysis of the action characteristics of the horizontal force shows that the arc shape can better disperse the impact force of water compared with the vertical shape component, and the contact area between the inclined component and the impact water body is larger, so the unit stress of the component is smaller, and the compression resistance is stronger. When the water level is lower than the bridge deck, the function of flood prevention and reinforcement of the railway bridge can be achieved, and when the water level is higher than the bridge deck, the flood can flow over the prefabricated component and the bridge deck, and the railway bridge after flood prevention and reinforcement is not damaged, and the railway bridge can operate normally after the water level decreases.

[0014] Optionally, the gravel gabion is a hexagonal double-twisted steel wire mesh box structure woven by low-carbon galvanized plastic steel wire, the top of the gravel gabion is provided with a cover plate, and two interval plates are arranged in the length direction inside the gravel gabion, and the interval between the two interval plates is 2 m.

[0015] Specifically, the size of the box body of the gravel gabion is 6 m in length, 0.5 m in height and 1 m in width, the steel wire of the gravel gabion mainly adopts mesh steel wire, edge steel wire and twisted edge steel wire, the diameter of the mesh steel wire is 2.7 mm, the tolerance is 0.06 mm, and the plating amount is not less than 245G / m 2 , the diameter of the edge steel wire is 3.4 mm, the tolerance is 0.07 mm, and the plating amount is not less than 265G / m 2 , and the diameter of the twisted edge steel wire is 2.2 mm, the tolerance is 0.06 mm, and the plating amount is not less than 230G / m 2 .

[0016] Optionally, the I-beam adopts 11# mine I-beam, the width of the I-beam is not less than 90 mm, the thickness of the I-beam is not less than 9 mm, the upper end of the I-beam is flush with the top surface of the raised part, and the lower end of the I-beam is fixed to the length of the bridge body, and the length of the bridge body is not less than 80 mm.

[0017] Optionally, the H-shaped steel adopts Q345B hot-rolled H-shaped steel with a specification of 400*400, and the two groups of H-shaped steel components closest to each other on the two adjacent frame bridge cylinders are not connected to each other, the section of the enlarged head part is a right trapezoid, the lower base length is not less than the width of the two welded H-shaped steels, and the height and the upper base length are both not less than 1.5 times the length of the lower base.

[0018] In a second aspect, the embodiments of the present application also provide a construction method of a flood-prevention type railway bridge reinforcing structure, comprising the following steps:

[0019] (1) prefabricating inverted T-shaped prefabricated components;

[0020] (2) assembling frame bridge cylinders and leveling bridge surfaces;

[0021] (3) installing anchoring components;

[0022] (4) installing gravel gabion baskets and prefabricated components and backfilling.

[0023] Optionally, in step (1), the inverted T-shaped prefabricated components adopt a reinforced concrete integrally cast structure, comprising a base and a column, and the connection angle between the base and the column is a rounded angle.

[0024] Optionally, in step (2), a 200mm settlement joint is left between the two adjacent frame bridge cylinders, the inside of the settlement joint is filled with an asphalt softwood frame, the section of the asphalt softwood frame is 190-200mm high and 40mm wide, the outside is filled with liquid rubber, and the liquid rubber material fills the lower part and both sides of the settlement joint.

[0025] Optionally, in step (3), the step of installing anchoring components comprises: fixing I-shaped steels on the left and right sides of the frame bridge cylinder through anchor rods, the anchor rods are made of Q235 steel material, the outer diameter is 18-20mm, the embedded length in the bridge body is not less than 0.8m, the number of anchor rods used for each I-shaped steel is not less than 3, the upper end of the I-shaped steel is higher than the bridge surface of the frame bridge cylinder and reaches the design elevation, the length of the lower end fixed to the bridge body is not less than 80mm, and the distance between the two adjacent I-shaped steels on the same side is not greater than 0.8m; the steel wire mesh is bound on the inner wall of the I-shaped steel, the upper end is flush with the top of the I-shaped steel, and the lower end is 2-3cm lower than the bottom of the gravel gabion basket; two H-shaped steels are welded together side by side to form an H-shaped steel component, which is fixed on the left and right sides of the frame bridge cylinder through anchor rods, and the corresponding H-shaped steel components on the two sides are fixed and connected together through steel reinforcement rods, an enlarged head part with a straight trapezoidal section is welded at the bottom of the H-shaped steel component, and the bottom end and the enlarged head part of the H-shaped steel component are inserted into the underwater soil body.

[0026] Optionally, in step (4), the step of installing the gabion stone and the prefabricated component and backfilling comprises placing the gabion stone in two sides above the frame bridge cylinder in order, leaving a gap between them; then filling the gabion stone with stone in layers, the thickness of each layer of stone is not higher than 25cm, the stone uses hard stone blocks or pebbles with a particle size of 10-25cm, and the filling bulk density is 18-19KN / m 3 Then, the second layer of gabion stone is placed in order on it, and the stone is filled in layers, the upper and lower two layers of gabion stone are twisted together through steel wire, every time a layer of gabion stone is placed, the two sides of the I-beam are connected together by a steel bar, and then fixed on the I-beam through a nut and a tray, the steel bar uses HRB335 threaded steel, and the outer diameter is 14-16mm; then the prefabricated component is placed above the gabion stone on both sides, and the space between the prefabricated component and the gabion stone on both sides is filled with ballast, and the space between the outside of each side prefabricated component and the steel mesh is filled with coal gangue.

[0027] The beneficial effects of the present application are:

[0028] (1) The gabion stone of the elevated part has the characteristics of good flexibility, no joints, and overall structure with ductility, and can also utilize its deformation capacity to meet the uneven settlement of the bridge, and the gabion stone has strong water passing capacity, good effect, and will not cause the bridge to be blocked by water, and can slow down the impact of flood on the bridge body, and avoid the water damage of the bridge.

[0029] (2) The inverted T-shaped prefabricated component is prefabricated in advance, which is more convenient and fast during construction, and the structure is special, the column is at a position about two-thirds of the base width away from the short side, which can withstand the impact of the flood on the water surface, protect the normal operation of the train on the track, the inside space filled with ballast also helps to reduce the damage of the train dynamic load to the inverted T-shaped prefabricated component, the outside water surface space filled with coal gangue has good water permeability, and the outside water surface space is larger than the inside space, so that the inverted T-shaped prefabricated component is more stable.

[0030] (3) the anchoring assembly can well reinforce the elevated part and the original bridge body integrally, the integral reinforcing structure has better integrality, stability and practicability, and better strengthens the flood control and reinforcement effect of the flood control railway bridge, and reflects the utility of the flood control railway bridge. The H-shaped steel plays a fixing role on the upper elevated part, and can ensure the integrality and stability of the elevated part and the bridge; the two groups of H-shaped steel assemblies closest to each other on the adjacent two frame bridge cylinders are not connected to each other, which can ensure that the frame bridge cylinder in the coal mining subsidence area will not be affected when uneven settlement occurs, and can well adapt to the special geographical conditions of the coal mining subsidence area; the enlarged head part with a trapezoidal cross section can provide a certain uplift resistance when the water level rises, ensure the stability of the bridge, and prevent the bridge from overturning after being impacted by flood.

[0031] (4) the reinforcing structure composed of the frame bridge body, the elevated part and the anchoring assembly can meet the requirements of preventing settlement deformation of the railway bridge in the coal mining subsidence area, and can meet the requirements of water passing and flood control stability of the bridge under the impact of flood and flooding, the structure is reliable, and the construction method is easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application will be further described below in combination with the drawings and embodiments.

[0033] Figure 1 The overall structure schematic diagram of the flood control railway bridge reinforcing structure provided by an embodiment of the application is shown.

[0034] Figure 2 The structure schematic diagram of the frame bridge cylinder of the flood control railway bridge reinforcing structure provided by an embodiment of the application is shown.

[0035] Figure 3 The three-dimensional structure schematic diagram of the prefabricated component of the flood control railway bridge reinforcing structure provided by an embodiment of the application is shown.

[0036] Figure 4 The three-dimensional structure schematic diagram of the gravel gabion of the flood control railway bridge reinforcing structure provided by an embodiment of the application is shown.

[0037] Figure 5 The flowchart of the construction method of the flood control railway bridge reinforcing structure provided by another embodiment of the application is shown. DETAILED DESCRIPTION

[0038] The application will be further described below in combination with the drawings and embodiments in the application, and the description herein is only used to explain the application, but not as a limitation on the application. Any modification, equivalent replacement, improvement and the like of all other embodiments obtained by those skilled in the art on the basis of the embodiments in the application without creative labor shall be included in the protection scope of the application.

[0039] Example 1

[0040] like Figures 1-2 As shown, this embodiment provides a flood-resistant railway bridge reinforcement structure, including a frame bridge body, an elevated section, and anchoring components. The frame bridge body is composed of multiple U-shaped frame bridge tubes 1 connected together. The elevated section is located above the water surface and includes reinforcement components on the left and right sides above the frame bridge body, and ballast 2 filled between the reinforcement components on both sides. The reinforcement components include prefabricated components 3 and crushed stone gabions 4 arranged sequentially from top to bottom, and the outer side of the prefabricated components 3 is filled with coal. Sleepers 6 and rails 7 are installed above the gangue 5 and ballast 2. The anchoring components include I-beams 8 and H-beams 9. Both I-beams 8 and H-beams 9 are fixed to the left and right sides of the frame bridge body by anchor rods 10. Wire mesh 11 is fixed on the inner wall of the I-beams 8 to fix the gangue 5 and the raised part. An enlarged head 12 is welded to the bottom of the H-beams 9 and is fixed in the underwater soil. The H-beams 9 is made of two H-beams welded together.

[0041] The I-beam 8 uses No. 11 mining I-beam. The width of the I-beam 8 is not less than 90mm and the thickness is not less than 9mm. The upper end of the I-beam 8 is level with the top surface of the raised part, and the lower end is fixed to the bridge body for a length of not less than 80mm.

[0042] The H-beams are made of Q345B hot-rolled H-beams with a specification of 400*400. The two sets of H-beam components 9 that are closest to each other on two adjacent frame bridge tubes 1 are not connected to each other. The cross-section of the enlarged head part 12 is a right trapezoid, and the length of the lower bottom edge is not less than the width of the two welded H-beams. The height and the length of the upper bottom edge are not less than 1.5 times the length of the lower bottom edge.

[0043] like Figure 3 As shown, the overall height of the precast component 3 is not less than 1m. The precast component 3 adopts an inverted T-shaped structure composed of columns 13 and bases 14. The lengths of columns 13 and bases 14 are the same as the length of the frame bridge tube 1. The cross-section of the base 14 is trapezoidal, with one side being the short side 15 and the other side being the long side 16. The height of the short side 15 is 20cm, and the height of the short side 15 is lower than the height of the long side 16. The angle between the top surface of the base 14 and the horizontal plane is 15°. The width of the bottom surface of the base 14 is equal to the width of the crushed stone gabion 4. The columns 13 are located above the base 14, and the distance from the bottom of the column 13 to the short side 15 is 2 / 3 of the width of the top surface of the base 14. The columns 13 are inclined towards the long side 16 of the base 14, and the angle between the columns 13 and the horizontal plane is 75°.

[0044] It can be understood that the inverted T-shaped prefabricated component 3 can be prefabricated in advance, which is more convenient and simple during construction, and the structure is special, which can play a good role in flood prevention and stability, the column 13 of the prefabricated component 3 can bear the impact of the flood on the water side at a position about two-thirds of the width of the base 14 from the short side 15, thereby protecting the normal operation of the train on the rail, and the inner space filled with ballast 2 is also conducive to reducing the damage of the train dynamic load to the inverted T-shaped prefabricated component 3, and the outer side water side space is filled with coal gangue 5, the coal gangue 5 has good water permeability, and the outer side water side space is larger than the inner side space, the weight of the water flow is pressed on the bottom of the component, so that the inverted T-shaped prefabricated component 3 is more stable.

[0045] In addition, the height of the short side 15 is 20 cm, the angle between the top surface of the base 14 and the horizontal plane is 15°, the angle between the column 13 and the horizontal plane is 75°, and the connection angle between the base 14 and the column 13 is a smooth arc fillet, by analyzing the action characteristics of the horizontal force, the arc shape can better disperse the impact force of the water compared with the vertical shape component, and the contact area of the inclined component with the impact water body is larger, so that the unit stress of the component is smaller, and the compression resistance is stronger. When the water level is lower than the bridge deck, the function of flood prevention and reinforcement of the railway bridge can be achieved, and when the water level is higher than the bridge deck, the flood can flow over the prefabricated component 3 and the bridge deck, and the railway bridge after flood prevention and reinforcement is not damaged, and the railway bridge can operate normally after the water level decreases.

[0046] As shown in Figure 4 , the gravel gabion 4 adopts a hexagonal double-twisted steel wire mesh box structure woven by low-carbon galvanized plastic steel wire, the top of the gravel gabion 4 is provided with a cover plate 17, and two interval plates 18 are arranged in the length direction inside the gravel gabion 4, and the interval between the two interval plates 18 is 2 m.

[0047] It can be understood that the size of the box body of the gravel gabion 4 is 6 m long, 0.5 m high and 1 m wide, the steel wire of the gravel gabion 4 mainly adopts a mesh surface steel wire, an edge steel wire and a twisted edge steel wire, the diameter of the mesh surface steel wire is 2.7 mm, the tolerance is 0.06 mm, the plating amount is not less than 245G / m 2 , the diameter of the edge steel wire is 3.4 mm, the tolerance is 0.07 mm, the plating amount is not less than 265G / m 2 , and the diameter of the twisted edge steel wire is 2.2 mm, the tolerance is 0.06 mm, and the plating amount is not less than 230G / m 2 .

[0048] The reinforcing structure composed of the frame bridge body, the elevated part and the anchoring assembly can not only satisfy the anti-settlement deformation of the railway bridge in the coal mining subsidence area, but also satisfy the water passing and flood prevention stability of the bridge under the condition of flood impact and water overflowing.

[0049] Example two

[0050] The embodiment provides a construction method of the flood-preventing railway bridge reinforcing structure, which mainly illustrates the construction process of the flood-preventing railway bridge reinforcing structure.

[0051] As shown in Figure 5 The construction method of the flood-preventing railway bridge reinforcing structure comprises the following steps:

[0052] S1 processing prefabricated components;

[0053] The prefabricated component in the inverted T shape is a reinforced concrete structure, mainly comprising a base and a column, the base section is in a trapezoidal shape, the height of the short side is 20 cm, the bottom width is the same as the paving gravel gabion, the included angle between the top surface of the base and the horizontal plane is 15°, the included angle between the column and the horizontal plane is 75°, the column is located at a position two-thirds of the base width away from the short side, the overall height of the prefabricated component in the inverted T shape is not less than 1 m, and the length of the prefabricated component is the same as the length of the frame bridge cylinder in the back-to-back shape.

[0054] S2 leveling the bridge deck;

[0055] The existing coal mining subsidence area bridge deck and track are cleaned to make the railway bridge deck relatively flat, thereby facilitating the later construction.

[0056] S3 processing the gabion;

[0057] A complete gabion unit is taken out, and the bent and deformed part is corrected, which can be pulled and stepped flat by using pliers. The partition plate and the front and rear panels are erected, the corner points are first fixed by using the edge steel wire extension part, the upper end edges of each vertical panel are ensured to be on the same horizontal plane, and special attention is paid to the fact that the two vertical edges and the bottom edge of the partition plate are on the same vertical plane. The partition plate is twisted along a vertical line, and the twisted partition plate is on the same vertical plane. The principle of assembling the gabion unit is that the shape is regular, the twisting is firm, the upper edges of all the vertical panels are on the same horizontal plane, and the edges of the cover plate can be twisted with the upper horizontal edges of the panels.

[0058] S4 installing the gabion and filling the material;

[0059] Before installation, first put the line, determine the outer edge of gabion stone. The assembled gabion stone is placed in the right place tightly and neatly, and the adjacent gabion stone edges are twisted with long steel wire. The long steel wire is twisted at an interval of 15 cm for 1 m long edge. The edge of the gabion stone at the second layer and above needs to be twisted with the lower layer, and the twisting requirement is the same as above. The edge steel wire is wound tightly around the adjacent edge. The filling stone must be put into the box at the same layer, and the thickness of each layer is controlled at about 25 cm. The 0.5 m high net box is preferably filled in two to three layers.

[0060] S5 installation of reinforcing structure;

[0061] On both sides of the railway bridge, 3 rows of holes are drilled in the reinforced concrete frame structure. Each mine I-beam is fixed to the bridge body by 3 small anchor rods and steel reinforcing rods, and the upper end height should be level with the railway bridge deck. The lower end is fixed to the bridge body with a length of not less than 80 mm. The distance between every two I-beams is not greater than 0.8 m. The steel mesh is tightly bound to the inner wall of the I-beam, and the upper end is flush with the top of the I-beam, and the lower end is 3 cm lower than the bottom of the gabion. The steel reinforcing rods are arranged horizontally and vertically, and the middle is connected by steel reinforcing rods. The nut and tray are fixed to the I-beam. Two H-shaped steels are fixed and welded together by small anchor rods and steel reinforcing rods outside the I-beam on both sides of the bridge body. The adjacent H-shaped steel structures on the adjacent frame bridge cylinders are not connected, and a settlement joint is left in the middle. The lower end of the two welded H-shaped steels is welded with an enlarged head with a straight trapezoidal cross section, and the bottom end of the H-shaped steel is inserted into the underwater soil body integrally with the enlarged head part.

[0062] S6 construction of elevated part;

[0063] Under the protection of the I-beam, the gabion stone is elevated. The gabion stone is placed next to the I-beam. When the settlement reaches 0.5 m, the gabion structure filled with stones on both sides of the bridge deck is elevated by 0.5 m. Then the precast inverted T-shaped precast member is placed above the gabion stone, the inside space is filled with ballast, and the outside space is filled with coal gangue. The middle part is filled with ballast and steel reinforcing rods. During the lifting process, attention should be paid to the height change of the left and right rails. The elevated bridge deck is leveled and the rails and sleepers are arranged. Then if there is further settlement, continue to lay gabion stone on the elevated part.

[0064] Embodiments of the application have been described above, with examples of the description being illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations of the described embodiments are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A flood-proof railway bridge reinforcement structure comprising a frame bridge main body, a raised portion, and an anchoring assembly, characterized in that: The main body of the frame bridge is composed of multiple U-shaped frame bridge tubes connected together. The raised section is located above the water surface. The raised section includes reinforcement components on the left and right sides above the main body of the frame bridge, and ballast filling the space between the reinforcement components on both sides. The reinforcement components include precast components and crushed stone gabions arranged sequentially from top to bottom. The outside of the precast components is filled with coal gangue. Sleepers and rails are installed above the ballast. The anchoring components include I-beams and H-beams. Both I-beams and H-beams are fixed to the left and right sides of the main body of the frame bridge by anchor bolts. Wire mesh is fixed to the inner wall of the I-beams to fix the coal gangue and the raised section. The bottom of the H-beam is welded with an enlarged head, which is fixed in the underwater soil. The H-beam is made up of two H-beams welded together.

2. The flood-protected railway bridge reinforcement structure according to claim 1, characterized in that: The overall height of the precast component is not less than 1m. The precast component adopts an inverted T-shaped structure consisting of columns and bases. The length of the columns and bases is the same as the length of the frame bridge tube. The cross-section of the base is trapezoidal, with one side being the short side and the other side being the long side. The height of the short side is 10-20cm, and the height of the short side is lower than the height of the long side. The angle between the top surface of the base and the horizontal plane is 10-15°. The width of the bottom surface of the base is equal to the width of the crushed stone gabion. The columns are located above the base, and the distance from the bottom of the column to the short side is 2 / 3 of the width of the top surface of the base. The columns are inclined towards the long side of the base, and the angle between the columns and the horizontal plane is 70-75°.

3. The flood-protected railway bridge reinforcement structure of claim 1, wherein: The crushed stone gabion is a hexagonal double-twisted wire mesh structure woven from low-carbon galvanized and plastic-coated steel wire. The top of the crushed stone gabion is equipped with a cover plate, and the interior of the crushed stone gabion is equipped with two partition plates along the length direction, with a spacing of 2m between the two partition plates.

4. The flood-protected railway bridge reinforcement structure of claim 1, wherein: The I-beams used are No. 11 mining I-beams. The width of the I-beams is not less than 90mm and the thickness is not less than 9mm. The upper end of the I-beams is level with the top surface of the raised part, and the lower end is fixed to the bridge body for a length of not less than 80mm.

5. The flood-protected railway bridge reinforcement structure of claim 1, wherein: H-shaped steel with a specification of 400 The Q345B hot-rolled H-shaped steel with a specification of 400 The section of the expanded head part is a right trapezoid, the length of the lower base is not less than the width of the two welded H-shaped steels, and the height and the length of the upper base are both not less than 1.5 times the length of the lower base.

6. A method of constructing a flood-protected railway bridge reinforcement structure according to any one of claims 1 to 5, characterized in that: Includes the following steps: (1) Precast inverted T-shaped precast components; (2) Assemble the frame bridge tube and level the bridge surface; (3) Install anchoring components; (4) Install crushed stone gabion cages and prefabricated components and backfill.

7. The construction method of a flood control type railway bridge reinforcement structure according to claim 6, characterized in that: In step (1), the inverted T-shaped precast component adopts a reinforced concrete integral casting structure, including a base and a column, and the connection angle between the base and the column is rounded.

8. The construction method of a flood control type railway bridge reinforcing structure according to claim 6, characterized in that: In step (2), a 200mm settlement joint is left between two adjacent frame bridge tubes. The interior of the settlement joint is filled with an asphalt cork frame with a cross section of 190-200mm high and 40mm wide. The exterior is filled with liquid rubber. When filling with liquid rubber material, the bottom and sides of the settlement joint should be blocked.

9. The construction method of a flood control type railway bridge reinforcing structure according to claim 6, characterized in that: In step (3), the step of installing the anchoring assembly comprises: fixing the I-beams on the left and right sides of the frame bridge cylinder through anchor rods, the anchor rods are made of Q235 steel material, the outer diameter is 18-20 mm, the embedded length in the bridge body is not less than 0.8 m, the number of anchor rods used by each I-beam is not less than 3, the upper end of the I-beam is higher than the bridge deck of the frame bridge cylinder and reaches the design elevation, the length of the lower end fixed on the bridge body is not less than 80 mm, the spacing between the two adjacent I-beams on the same side is not greater than 0.8 m; the steel wire mesh is bound on the inner wall of the I-beam, the upper end is flush with the top of the I-beam, and the lower end is 2-3 cm lower than the bottom of the gravel gabion; two H-shaped steels are welded together side by side to form an H-shaped steel assembly, which is fixed on the left and right sides of the frame bridge cylinder through anchor rods, and the corresponding H-shaped steel assemblies on the two sides are fixed and connected together through steel reinforcement pull rods, an enlarged head part with a straight trapezoidal cross section is welded at the bottom of the H-shaped steel assembly, and the bottom end and the enlarged head part of the H-shaped steel assembly are inserted into the underwater soil.

10. The construction method of a flood control type railway bridge reinforcing structure according to claim 6, characterized in that: In step (4), the step of installing the gabion stone cage and backfilling the prefabricated component includes placing the gabion stone cage in two sides above the frame bridge cylinder in order, leaving a gap between them; then filling the stone in the gabion stone cage layer by layer, the thickness of each layer of stone is not higher than 25 cm, the stone uses hard stone block with particle size of 10-25 cm, and the filling bulk density is 18-19 KN / m 3 Then the second layer of gabion stone cage is placed orderly on it and filled with stone layer by layer, the upper and lower two layers of gabion stone cage are twisted together through steel wire, the two sides of the I-beam are connected together by the steel bar tie rod every time a layer of gabion stone cage is placed, and then the steel bar tie rod is fixed on the I-beam through the nut and tray, the steel bar tie rod uses HRB335 threaded steel bar with outer diameter of 14-16 mm; then the prefabricated component is placed on the upper side of the gabion stone cage, and the space between the prefabricated component and the gabion stone cage on the two sides is filled with ballast, and the space between the outer side of each side prefabricated component and the steel mesh is filled with coal gangue.

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