Hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel and construction method thereof

Abstract

The present invention relates to a hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway overpass, the overpass including an arch ring arranged on a railway line, the arch ring being a steel plate concrete composite load-bearing arch ring structure composed of an arch ring steel plate frame and concrete poured on one side of the arch ring steel plate frame; the arch ring steel plate frame is formed by arranging and splicing a plurality of hyperbolic curved steel corrugated plate shells in a matrix, the arched sides of the steel corrugated plate shells being spliced ​​with a steel bar frame; the steel corrugated plate shells are formed by rolling a flat steel corrugated plate with upwardly extending plate teeth on both sides, and then bending the plate shells twice to form upwardly curved circular arch waves in the transverse direction, and to produce an arch deformation with the same curvature as the arch ring in the longitudinal direction. The overpass structure of the present invention has great compressive and bending rigidity and deformation resistance, without the need for an under-arch support, and has a simple construction process, a short construction period, and a low cost.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering technology, and in particular to a hyperbolic steel-concrete combined arched open tunnel for highway and railway intersection projects (bridge projects) and a construction method thereof. The invention is particularly suitable for the rapid implementation of three-dimensional intersection projects of ordinary-grade highways and railways and road and bridge restoration projects in emergency rescue operations. Background Art

[0002] With the sustained and rapid development of my country's socioeconomic landscape and the gradual implementation of the "Transportation Revitalization Plan," the depth and breadth of accessibility for the two fundamental modes of transportation, road and rail, which underpin these developments, will be further enhanced. Consequently, significant road-rail intersections will inevitably occur during implementation. To ensure the safety of these intersections and the efficient operation of their respective lines, the use of grade separations will be a necessary choice for future construction, whether in new construction or reconstruction to eliminate safety hazards at level crossings.

[0003] The most critical factor in determining the construction plan for a railway-highway interchange is how to select a grade separation type that is structurally safe, fast to construct, and inexpensive. Currently, three main structural types are used for railway-highway interchanges nationwide. The first is where a highway passes under an existing railway line. This typically utilizes a push-through frame construction method, which is time-consuming and expensive. Construction disrupts railway operations for a significant period, and requires the construction of extensive highway drainage facilities, resulting in high operational costs later on. The second is where a highway crosses an existing railway line. Currently, a multi-hole, multi-beam bridge is the most commonly used type of bridge. However, the prefabrication, installation, and erection of the bridge's substructure and upper beams take a long time, significantly disrupting the railway and resulting in a high cost. The third is the currently popular "T"-shaped rigid frame rotation construction method. This method offers a safe bridge structure, efficient construction, and minimal disruption to existing railway operations. However, its structure is complex and expensive, making it primarily suitable for crossing highways and high-speed railways. Therefore, how to provide a fast, efficient and cost-effective road-rail interchange type to effectively solve the large number of ordinary-grade road-rail intersections in the future, and to cancel the numerous existing railway level crossings to eliminate safety hazards, will be an urgent problem to be solved in the current and future revitalization and accelerated development of transportation. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned common construction schemes, apply composite material technology, and adopt an arched open hole structure composed of a bidirectional curved arch steel corrugated plate shell and reinforced concrete.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway overpass open-type tunnel, the open-type tunnel comprising an arch ring arranged on a railway line, the arch ring being a steel plate concrete composite load-bearing arch ring structure consisting of an arch ring steel plate skeleton and concrete poured on one side of the arch ring steel plate skeleton;

[0007] The arch ring steel plate skeleton is formed by arranging and splicing a plurality of hyperbolic curved steel corrugated plate shells in a matrix, and the arched side of the steel corrugated plate shell is spliced ​​with a steel frame; the steel corrugated plate shell is formed by rolling a flat steel corrugated plate with upwardly extending plate teeth on both sides, and then bending it for the second time to make it have an upwardly curved arc arch wave in the transverse direction (direction of the tunnel body), and to produce an arch deformation in the longitudinal direction (direction of the arch ring) with the same curvature as the arch ring.

[0008] Furthermore, connecting bolt holes A are provided on the plate teeth every 20 to 30 cm, and the connecting bolt holes A are used for bolt connection when two adjacent steel corrugated plate shells are horizontally spliced.

[0009] Furthermore, flange-connected steel plates of a rectangular structure for longitudinal splicing are welded at both ends of the steel corrugated plate shell. The length of the flange-connected steel plate is the same as the transverse bottom width of the steel corrugated plate shell, and the height of the flange-connected steel plate is higher than the height of the steel corrugated plate shell; connecting bolt holes B are provided on the periphery and middle of the flange-connected steel plate.

[0010] Furthermore, at intervals of 100 to 200 cm on the bottom surface of the steel corrugated plate shell, chord-wise steel strips perpendicular to the normal cross section are welded between the plate teeth on both sides.

[0011] Furthermore, the steel skeleton is a three-dimensional steel skeleton network formed by cross-welding of regular cross-section transverse steel bars, regular cross-section vertical steel bars, arc-shaped steel bars parallel to the arch ring axis, and upright steel bars bent at 45° and 135° at both ends respectively.

[0012] Furthermore, arc-shaped connecting steel bars are arranged across the three-dimensional steel skeleton mesh every 20 to 30 cm. The arc-shaped connecting steel bars are welded or tied to the steel bars in the three-dimensional steel skeleton mesh and are double-sidedly welded to the upper surface of the steel corrugated plate shell.

[0013] Furthermore, the width of the steel corrugated plate shell is 1.2 to 2.5 m, and the length is 4.0 to 10.0 m; the steel corrugated plate shell is a plate body rolled from plates and coils with a thickness of 3.5 to 10 mm; the corrugation pitch of the flat steel corrugated plate of the steel corrugated plate shell during rolling is 100 to 350 mm, and the wave depth is 50 to 200 mm; the height of the plate teeth of the steel corrugated plate shell is 60 to 120 mm.

[0014] The present invention discloses a hyperbolic steel corrugated plate shell concrete combined arch-type railway overpass open-cut tunnel. The construction principle is to use a bidirectionally curved steel corrugated plate shell as the base plate of the open-cut tunnel arch ring concrete, and weld a steel reinforcement frame thereon to form a modular unit. The unit is composed of a plurality of steel corrugated plates having a circular arch wave in cross section and the same curvature as the arch ring in longitudinal section, and the steel reinforcement frame is assembled to form a steel plate arch frame of 1 / 2 arch ring on each side of the open-cut tunnel. The steel plate arch frame is then hoisted into place on the arch seats on both sides and hoisted to the middle of the span to close together, thereby forming the steel plate arch ring frame of the arch-type open-cut tunnel. Because the frame has a large overall rigidity and deformation resistance, the steel corrugated plate at the bottom also serves as a bottom formwork. The stressed steel wave arch ring frame also serves as the arch support during construction. Therefore, the arch ring concrete can be poured without any support under the arch, achieving a support-free construction.

[0015] According to the above construction principle, the present invention discloses a method for constructing a hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway interchange open-cut tunnel, which specifically includes the following steps:

[0016] 1) Complete the construction of rail reinforcement and arched open-cut foundation in advance, and complete the preparatory work for burying and hoisting the arch seat reinforcement into place;

[0017] 2) Based on the lifting control capability, one or more 1 / 2 arch ring steel plate skeletons are spliced ​​on both sides of the rails, and are accurately and stably hoisted into the arch base grooves of the two abutments of the open tunnel. They are then rotated and hoisted toward the mid-span to complete the closure.

[0018] 3) After bolting the flange connection steel plates at the arch top, repeat step 2) and add bolt connection and welding of the transverse plate teeth after splicing;

[0019] 4) Repeat steps 2) and 3) until all the arch ring reinforcement skeletons are hoisted, closed and spliced. If the hoisting control capability permits, the installation can be completed by hoisting and closing the entire arch ring in sequence.

[0020] 5) For the joint reinforcement at the continuous welding joint, add transverse structural reinforcement and structural reinforcement in the same direction as the arch ring to strengthen the overall rigidity of the arch ring steel plate skeleton;

[0021] 6) Support the side formwork of the opening and the upper formwork of the arch on the teeth of the two outermost plate shell units of the arch-shaped open hole. According to the principle of symmetry, pour the concrete arch ring layer by layer from the arch feet on both sides to the arch top, and ensure that it is vibrated and compacted;

[0022] 7) After the arch ring concrete reaches the specified strength, the construction of the arch structure and the retaining walls and approach roads on both sides can be carried out on the formed composite arch ring structure. After the subsequent pavement engineering and traffic safety facilities are completed, the highway can be opened to traffic.

[0023] Furthermore, the concrete used to cast the arch ring is made of slightly expanding concrete material, and the structure on the arch is made of lightweight fluid self-compacting filler.

[0024] Compared with the existing technology, the open hole of this construction principle has the following beneficial effects:

[0025] First, the welded outer steel reinforcement frame of the hyperbolic corrugated steel plate shell significantly increases the rigidity of its composite cross-section. The resulting two-hinged arch ring steel plate skeleton, formed after splicing, possesses sufficient compressive, bending, and deformation resistance. Furthermore, the arch ring bottom surface formed by the hyperbolic corrugated steel plate shell maximizes the spatial load-bearing capacity of the shell, giving the entire steel plate arch ring skeleton certain hyperbolic arch load-bearing characteristics. The hyperbolic corrugated steel plate shell at the arch ring bottom serves as both the load-bearing base plate of the composite concrete arch ring and the bottom formwork, making the entire steel plate arch ring skeleton both the primary load-bearing component of the composite arch ring and the arch support. Therefore, no support or formwork is required under the open-cut arch. Concrete pouring can proceed by simply supporting the arch ring with the portal side formwork and the arch upper outer formwork on the plate teeth of the shell shell on both sides of the portal. This greatly simplifies the construction process and significantly reduces disruption to railway operations. The total construction period can be shortened several times compared to currently common solutions, while also being relatively cost-effective and saving significant construction funds.

[0026] In addition, since the hyperbolic steel corrugated plate shell and welded steel bars of this bridge structure can be factory-produced and standardized, the steel plate arch frame can be quickly assembled without the need for brackets at the construction site. The requirements for the abutment foundation and arch seat are low, and the overall deformation resistance of the structure is strong. Therefore, this technical solution can play its unique role in quickly restoring the traffic capacity of roads and bridges in emergencies such as disaster relief, and has great social application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a double-curved steel corrugated plate shell concrete combined arched open-type tunnel;

[0028] Figure 2 for Figure 1 Schematic diagram of mid-span section AA;

[0029] Figure 3 This is a schematic diagram of the double-curved steel corrugated plate shell after the arch ring skeleton is assembled and closed;

[0030] Figure 4 Schematic diagram of a flat steel corrugated plate with plate teeth on both sides;

[0031] Figure 5 Schematic diagram of a steel corrugated plate shell with circular arch waves in the transverse direction;

[0032] Figure 6 Schematic diagram of a steel corrugated plate shell with bidirectional bending in both the horizontal and vertical directions;

[0033] Figure 7 Schematic diagram of the chordal steel strips welded to the bottom of the hyperbolic corrugated steel shell;

[0034] Figure 8 Schematic diagram of the flange connection steel plates welded at both ends of the hyperbolic steel corrugated plate shell;

[0035] Figure 9 This is a schematic diagram of the side elevation of the hyperbolic steel corrugated plate shell;

[0036] Figure 10 Schematic diagram of the steel bar skeleton welded on the outside of the hyperbolic steel corrugated plate shell;

[0037] Figure 11 for Figure 10 Schematic diagram of the positive section BB;

[0038] Figure 12 This is a schematic diagram of the hoisting and closing of the steel arch frame of the hyperbolic steel corrugated plate shell;

[0039] Figure 13 This is a schematic diagram of the planar layout of the arch ring steel plate skeleton when the road and railway are orthogonal;

[0040] Figure 14 This is a schematic diagram of the plan layout of the arch ring steel plate skeleton when the road and railway intersect obliquely. DETAILED DESCRIPTION

[0041] The following, in conjunction with the accompanying drawings and examples, further describes the specific implementation of the hyperbolic steel corrugated plate shell concrete combined arched open-type tunnel of the present invention. The following examples are intended only to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

[0042] Example 1

[0043] Figure 1-2 An embodiment of the steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel of the present invention is shown.

[0044] The arched open tunnel mainly includes an arch ring 1 set on the railway line, abutment arch foot bases 6 on both sides, an arch structure 7 and approach roads on both sides. The arch ring 1 is a steel plate concrete composite load-bearing arch ring structure composed of an arch ring steel plate frame 10 and concrete 11 poured on one side of the arch ring steel plate frame 10.

[0045] The arch steel plate frame 10 is formed by arranging and splicing a plurality of hyperbolic curved steel corrugated plate shells 2 in a matrix. Figure 3The steel corrugated plate shell 2 is formed by rolling a flat steel corrugated plate with plate teeth 20 extending upward on both sides and then bending it by secondary rolling to make it have an upwardly curved arc arch wave in the transverse direction, and the longitudinal curvature of the arch ring 1 is the same as the plate shell. Figure 5 、 6 The arched side of the steel corrugated plate shell 2 is spliced ​​with a steel bar skeleton 3.

[0046] Figure 3 The figure shows a complete arch ring steel plate skeleton effect diagram formed by multiple steel corrugated plate shells 2 being spliced ​​in a vertical and horizontal matrix to form a 1 / 2 arch ring on each half side, which is closed at the mid-span. The figure does not show the steel bar skeleton welded on the outside of the steel corrugated plate shell 2.

[0047] Figure 4-9 The overall processing process of the hyperbolic steel corrugated plate frame is shown.

[0048] Figure 4 The corrugated steel plate shell 2 is first rolled according to the design into a flat steel corrugated plate with upwardly extending plate teeth 20 on both sides. The flat steel corrugated plate has a corrugation pitch of 100-350 mm, a corrugation depth of 50-200 mm, a plate tooth 20 height of 60-120 mm, and a plate thickness of 3.5-10 mm.

[0049] Figure 5 The second step of processing the steel corrugated plate shell 2 is shown. According to the design requirements of the plate shell width (chord length of the arc) and height (sagitta), the flat steel corrugated plate is bent and rolled upward in the transverse direction to produce an arc arch wave that meets the design sagitta and chord length.

[0050] Figure 6 The third step in the processing of the corrugated steel shell 2 is shown. The shell, with its transverse circular arch waves, is bent and rolled longitudinally to achieve a curvature that matches the curvature of the designed open-cut arch ring. This completes the entire bending and rolling process for the corrugated steel shell 2. After bending and rolling, the corrugated steel shell 2 has a width of 1.2 to 2.5 meters and a length of 4.0 to 10.0 meters.

[0051] An improved example of one aspect based on the above-mentioned steel corrugated plate shell technical solution, in order to further realize the splicing function of the steel corrugated plate shell 2, the steel corrugated plate shell 2 is rolled on both sides with plate teeth 20 that are upright outward and upward. Figure 4-6 The plate teeth 20 are provided with connecting bolt holes A21 every 20 to 30 cm. The connecting bolt holes A21 are used for bolt connection when two adjacent steel corrugated plate shells 2 are horizontally spliced.

[0052] Based on the above technical solution, in a specific example, the technical solution of the steel corrugated plate shell 2 is improved as follows: Figure 7As shown, at positions of 100 to 200 cm on the bottom surface of the steel corrugated plate shell 2, chordal steel strip pull straps 24 perpendicular to the cross section are welded between the plate teeth 20 on both sides; the chordal steel strip pull straps 24 can strengthen the overall stiffness of the steel corrugated plate shell 2 and control its deformation.

[0053] Another specific improvement example for the steel corrugated plate shell 2 is as follows: Figure 8 As shown, in order to achieve longitudinal axial splicing of the steel corrugated plate shell 2, rectangular flange connection steel plates 22 are welded at both ends of the steel corrugated plate shell 2. The length of the flange connection steel plate 22 is the same as the transverse bottom width of the steel corrugated plate shell 2, and the height of the flange connection steel plate 22 is higher than the height of the steel corrugated plate shell 2; the periphery and middle of the flange connection steel plate 22 are provided with connection bolt holes B 23.

[0054] Example 2

[0055] Based on Example 1, the steel skeleton may be further improved as follows.

[0056] Figure 10-11 The steel reinforcement framework 3 welded to the outside of the corrugated steel shell 2 is shown. This framework 3 is composed of a three-dimensional steel mesh, welded together, consisting of transverse reinforcement 30 oriented in the direction of the shell, vertical reinforcement 31 oriented in the direction of the shell, axial curved reinforcement 32 with the same curvature and arc length as the arch ring 1 and the corrugated steel shell 2, and vertical reinforcement 33 bent at 45° and 135° at each end. This three-dimensional steel mesh is interlaced with curved connecting reinforcement 34 every 20-30 cm. These reinforcements 34 are welded or tied across the cross-section to the transverse, vertical, axial, and vertical reinforcements, and then welded to the top of the corrugated steel shell 2 on both sides, ensuring a certain weld height.

[0057] The embodiment of the open hole of the present invention adopts a support-free construction method, and the arch ring steel plate frame 10 is spliced ​​and closed by splicing multiple frames and then hoisting and closing them, or by hoisting and closing the entire frame at one time.

[0058] The method of splicing multiple frames and then hoisting and closing them is as follows: the steel corrugated plate shell 2 serves as the bottom plate of the open hole arch ring concrete, and a steel bar skeleton is welded thereon so that the two form an assembleable unit body, and the unit body composed of several steel corrugated plate steel bar skeletons with circular arch waves in cross section and the same curvature as the arch ring in longitudinal surface is spliced ​​in the transverse and axial directions of the arch to form a steel plate arch skeleton of 1 / 2 arch ring on each side of the open hole, and then they are hoisted into place on the arch seats on both sides and hoisted to the middle of the span to close, so as to form the steel plate arch ring skeleton of the arch-shaped open hole. The following embodiment specifically illustrates the construction method of the open hole of the present invention.

[0059] Example 3

[0060] The present invention discloses a specific construction method of the hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway interchange open-cut tunnel, comprising the following steps:

[0061] 1) Complete the construction of rail reinforcement and arched open-cut foundation in advance, and complete the preparatory work for burying and hoisting the arch seat reinforcement into place;

[0062] 2) According to the hoisting control capability, one or more 1 / 2 arch ring steel plate frames 10 are spliced ​​on both sides of the rails, and are accurately and stably hoisted into the arch seat base grooves 6 of the two abutments of the open tunnel, and then rotated and hoisted to complete the closure, such as Figure 12 As shown;

[0063] 3) After bolting the flange connection steel plates 22 at the arch top closure, repeat step 2) and add bolt connection and welding of the transverse plate teeth after splicing;

[0064] 4) Repeat steps 2) and 3) until all the arch ring steel bar skeletons 10 are hoisted, closed and spliced. If the hoisting control capability permits, the installation can be completed by hoisting and closing the entire arch ring in sequence.

[0065] 5) Continuously weld the joint reinforcement at the splicing point, and weld the transverse structural reinforcement and the same direction as the arch ring 1 to strengthen the overall rigidity of the arch ring steel plate skeleton 10;

[0066] 6) Pour the concrete arch ring layer by layer from the arch feet on both sides to the arch top according to the principle of symmetry, and ensure that it is vibrated and compacted (the possible convergence deformation of the arch ring steel plate skeleton 10 should be calculated and reserved in advance during the prefabrication stage to ensure the clearance requirements of the open hole). The poured concrete should preferably be made of slightly expansive concrete material;

[0067] 7) After the arch ring concrete reaches the specified strength, the construction of the arch structure and the retaining walls and approach roads on both sides can be carried out on the formed composite arch ring structure. The arch structure should use lightweight fluid self-compacting fillers, such as fluid fly ash. After the subsequent pavement engineering and traffic safety facilities are completed, the highway can be opened to traffic.

[0068] It should also be noted that the steel corrugated plate shell of the present invention is designed and adjusted according to the different road-rail interchange open-cut conditions. For lines where the road and rail are orthogonal, the steel corrugated plate shell 2 of the present invention is produced and processed in an orthogonal form, and the engineering embodiment performs the splicing and installation of the arch ring steel plate skeleton in the road-rail orthogonal form. For lines where the road and rail are obliquely forked, the present invention provides an oblique orthogonal solution, that is, the arch ring steel plate skeleton is still spliced ​​and installed in the road-rail orthogonal form during installation, but the number of splicing frames needs to be increased and the length of the arch open-cut needs to be extended to meet the width requirements of the road in the oblique intersection form. Figure 13 The schematic diagram of the layout of the steel plate skeleton plane of the orthogonal arch ring of the highway and railway is shown; Figure 14A schematic diagram of the planar layout of the steel plate skeleton of the road-rail skew arch ring is shown.

[0069] The technical solution of the present invention is also applicable to grade-separated intersections between highways and bridge projects spanning water conservancy facilities such as ditches; and is further expanded to be applicable to the design and application of porous arch bridges.

[0070] In addition, since the arched open tunnel of the present invention adopts a bracket-free rapid assembly construction method, its steel corrugated plate shell and welded steel frame can be standardized produced in the factory. Therefore, the above-mentioned structure can be used as a strategic reserve material for national emergency rescue and disaster relief, and can fully play its role in quickly restoring the traffic of roads, bridges and culverts in response to sudden emergency events.

[0071] The above-described embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments shall be included in the scope of protection of this technical solution.

Claims

1. A hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open hole, the open hole comprising an arch ring (1) arranged on the railway line, characterized in that: The arch ring (1) is a steel plate concrete composite stress-bearing arch ring structure consisting of an arch ring steel plate frame (10) and concrete (11) poured on one side of the arch ring steel plate frame (10); The arch ring steel plate skeleton (10) is formed by arranging and splicing a plurality of hyperbolic steel corrugated plate shells (2) in a matrix, and the arched side of the steel corrugated plate shell (2) is spliced ​​with a steel bar skeleton (3); the steel corrugated plate shell (2) is formed by rolling a flat steel corrugated plate with plate teeth (20) extending upward on both sides, and then bending it by secondary rolling so that it has an upwardly curved arc arch wave in the transverse direction, and produces an arch deformation with the same curvature as the arch ring (1) in the longitudinal direction; the two ends of the steel corrugated plate shell (2) are welded with rectangular flange connection steel plates (22) for longitudinal axial splicing, and the steel corrugated plate shell (2) is a plate body formed by rolling a plate and a coil with a thickness of 3.5 to 10 mm.

2. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 1, characterized in that: The plate teeth (20) are provided with connecting bolt holes A (21) every 20 to 30 cm. The connecting bolt holes A (21) are used for bolt connection when two adjacent steel corrugated plate shells (2) are horizontally spliced.

3. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 1, characterized in that: The length of the flange connection steel plate (22) is the same as the transverse bottom width of the steel corrugated plate shell (2), and the height of the flange connection steel plate (22) is higher than the height of the steel corrugated plate shell (2); the periphery and the middle of the flange connection steel plate (22) are provided with connection bolt holes B (23).

4. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 1, characterized in that: At positions of 100 to 200 cm on the bottom surface of the steel corrugated plate shell (2), a chord-wise steel strip pulling belt (24) perpendicular to the normal section is welded between the plate teeth (20) on both sides.

5. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 1, characterized in that: The steel frame (3) is a three-dimensional steel frame network formed by cross-welding of regular cross-section transverse steel bars (30), regular cross-section vertical steel bars (31), arc-shaped steel bars (32) parallel to the arch ring (1), and vertical steel bars (33) bent at both ends at 45° and 135° respectively.

6. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 5, characterized in that: The three-dimensional steel skeleton mesh is provided with arc-shaped connecting steel bars (34) crossing every 20 to 30 cm. The arc-shaped connecting steel bars (34) are welded or tied to the steel bars in the three-dimensional steel skeleton mesh and are double-sidedly welded to the upper surface of the steel corrugated plate shell (2).

7. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 1, characterized in that: The width of the steel corrugated plate shell (2) is 1.2 to 2.5 m, and the length is 4.0 to 10.0 m; the corrugation pitch of the flat steel corrugated plate of the steel corrugated plate shell (2) during rolling is 100 to 350 mm, and the wave depth is 50 to 200 mm; the height of the plate teeth (20) of the steel corrugated plate shell (2) is 60 to 120 mm.

8. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to any one of claims 1 to 7, characterized in that: The construction method of the open hole is a support-free construction method, and the arch ring steel plate frame (10) is spliced ​​and closed by a method of splicing multiple frames and then hoisting and closing them, or a method of hoisting and closing the entire frame at one time; The method of splicing the multiple frames and then hoisting and closing them is as follows: the steel corrugated plate shell (2) serves as the bottom plate of the open hole arch ring concrete, and a steel bar skeleton is welded thereon so that the two form an assembleable unit body, which is composed of a plurality of steel corrugated plate steel bar skeletons with circular arch waves in cross section and the same curvature as the arch ring in longitudinal direction. After being spliced ​​in the transverse direction and the axial direction of the arch, a steel plate arch skeleton of 1 / 2 arch ring is formed on each side of the open hole, and then they are hoisted into place on the arch seats on both sides and hoisted to the middle of the span for closing, so as to form a steel plate arch ring skeleton of the arch-shaped open hole.

9. The hyperbolic steel corrugated plate shell concrete combined arch type highway-railway interchange open-cut tunnel according to claim 8, characterized in that: When the road-rail interchange is an orthogonal road-rail interchange, the steel corrugated plate shell (2) is produced and processed in an orthogonal form, and the arch ring steel plate skeleton is spliced ​​and installed in the road-rail orthogonal form during installation; when the road-rail interchange is an oblique road-rail interchange, the steel corrugated plate shell (2) is still produced and processed in an orthogonal form, and the arch ring steel plate skeleton is spliced ​​and installed in the road-rail orthogonal form during installation, and the number of splicing frames is increased as needed.

10. A method for constructing a hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway interchange open-cut tunnel according to any one of claims 1 to 8, comprising the following steps: 1) Complete the construction of rail reinforcement and arched open-cut foundation in advance, and complete the preparatory work for burying and hoisting the arch seat reinforcement into place; 2) Based on the lifting control capability, one or more 1 / 2 arch ring steel plate skeletons are spliced ​​on both sides of the rails, and are accurately and stably hoisted into the arch base grooves of the two abutments of the open tunnel. They are then rotated and hoisted toward the mid-span to complete the closure. 3) After bolting the flange connection steel plates at the arch top, repeat step 2) and add bolt connection and welding of the transverse plate teeth after splicing; 4) Repeat steps 2) and 3) until all the arch ring reinforcement skeletons are hoisted, closed and spliced. If the hoisting control capability permits, the installation can be completed by hoisting and closing the entire arch ring in sequence. 5) For the joint reinforcement at the continuous welding joint, add transverse structural reinforcement and structural reinforcement in the same direction as the arch ring to strengthen the overall rigidity of the arch ring steel plate skeleton; 6) Support the side formwork of the opening and the upper formwork of the arch on the teeth of the two outermost plate shell units of the arch-shaped open hole. According to the principle of symmetry, pour the concrete arch ring layer by layer from the arch feet on both sides to the arch top, and ensure that it is vibrated and compacted; 7) After the arch ring concrete reaches the specified strength, the arch structure and the retaining walls and approach roads on both sides can be constructed on the arch ring structure. After the subsequent pavement engineering and traffic safety facilities are completed, the highway can be opened to traffic; in, The poured concrete adopts micro-expansive concrete material, and the arch structure adopts light fluid self-compacting filler.

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