A combination of permanent and temporary bridges and its construction method for eroded sections of riverside roads in mountainous areas.

Abstract

This invention provides a temporary-permanent bridge and its construction method for eroded sections of roads along rivers in mountainous areas. The temporary bridge consists of a first treatment structure and a second treatment structure, respectively installed at the two roadbed sections to be connected. Both ends of a first steel strand are connected to the first and second treatment structures using prestressed anchors. One end of an I-beam is embedded in the mountainside, and the intersection of the first steel strand and the I-beam is connected by a locking mechanism. Steel plates are then laid on top of the I-beam, and anti-slip threaded steel bars and steel cable railings are installed to form the temporary bridge, used for rapid repair and traffic restoration, allowing pedestrians and vehicles to pass, meeting the needs of emergency rescue operations. After the emergency rescue work is completed, the temporary bridge is further reinforced, and small box girders are laid as needed to connect it to the original road. A corresponding number of steel piers are also installed according to the design requirements to form a permanent bridge, eliminating the need to demolish the original temporary bridge, thus improving efficiency and utilization.

Description

Technical Field

[0001] This invention relates to the field of road and bridge construction technology, and more specifically, to a permanent-temporary combined bridge and its construction method for eroded sections of roads along rivers in mountainous areas. Background Technology

[0002] Highways built along mountainsides, especially those with mountains on one side and rivers on the other, require rapid repair and restoration after landslides or mudslides erode and damage the roadbed. However, constructing new roadbeds or bridges at landslide sites is difficult and time-consuming, making it difficult to meet the needs of emergency repairs and restoration in a short time. Furthermore, the traditional methods for converting temporary roads to permanent ones are complex and require the demolition of many temporary bridges, resulting in low utilization rates. Summary of the Invention

[0003] The purpose of this invention is to provide a combination of permanent and temporary bridges and a construction method for eroded sections of mountainous river roads. It solves the problems of needing to quickly repair and maintain traffic flow after landslides or debris flows erode and damage the roadbed, but the difficulty and time required to build new roadbeds or bridges at the collapse site make it difficult to meet the needs of emergency repairs and traffic resumption in a short time. In addition, the traditional method of converting temporary bridges to permanent ones is complicated and requires the demolition of a large number of temporary bridges, resulting in low utilization.

[0004] The embodiments of the present invention are achieved through the following technical solution: a temporary bridge for eroded sections of a mountain river road, used to connect sections of the original roadbed that have been eroded, comprising a first treatment structure, a second treatment structure, a plurality of first steel strands and a plurality of I-beams, wherein the first treatment structure and the second treatment structure are respectively set at the two roadbed sections to be connected, the plurality of first steel strands are horizontally spaced apart, and both ends of the first steel strands are connected to the first treatment structure and the second treatment structure respectively by prestressed anchors;

[0005] Several I-beams are horizontally spaced on several first steel strands, the I-beams and the first steel strands are perpendicular to each other, one end of the I-beam is embedded in the mountain body, and the intersection of the first steel strands and the I-beams is connected by a locking buckle.

[0006] It also includes two cable guardrails, which are symmetrically arranged along the centerline of the roadbed. The two ends of the cable guardrails are respectively connected to the first treatment structure and the second treatment structure, and the middle part of the cable guardrails is connected to the I-beam.

[0007] A steel plate is horizontally spliced ​​on several of the I-beams, and the two ends of the steel plate along the roadbed are connected to the original highway; the upper surface of the steel plate is provided with anti-slip texture, and the steel plate is located between two of the cable railings.

[0008] Furthermore, the first processing structure is identical to the second processing structure and is arranged symmetrically to each other;

[0009] The first treatment structure includes a concrete support, a concrete anchor, and a concrete floor. The concrete support and the concrete anchor are spaced apart. The concrete support is located at the end of the eroded section of the original roadbed, the concrete anchor is embedded inside the original roadbed, and the concrete floor connects the tops of the concrete support and the concrete anchor.

[0010] The two ends of the first steel strand pass through the concrete support, the concrete floor and the concrete anchor in sequence, and the prestressed anchor is embedded in the end of the concrete anchor away from the concrete support.

[0011] Furthermore, the steel cable railing includes two concrete columns, several steel columns and several second steel strands. The two concrete columns are integrally cast with the two concrete supports, and the several steel columns are spaced apart on the several I-beams.

[0012] Several second steel strands are arranged horizontally and distributed at intervals along the vertical direction. Both ends of the second steel strands are connected to two concrete columns respectively through prestressed anchors. The second steel strands are fixed to several steel columns respectively through several locking buckles.

[0013] Furthermore, the latch includes a U-shaped clamp, a steel wire rubber sleeve, a spring washer, and a nut. Several steel wire rubber sleeves are spaced apart on both the first and second steel strands, and the steel wire rubber sleeves are placed inside the recess of the U-shaped clamp.

[0014] The I-beams and steel columns each have multiple sets of fixing holes in pairs. The two ends of the U-shaped clamp pass through the fixing holes and are fitted with spring washers. Both ends of the U-shaped clamp are threaded with multiple nuts.

[0015] Furthermore, the steel plate is provided with multiple threaded steel bars at intervals, and the threaded steel bars are parallel to the I-beam.

[0016] A temporary bridge combining permanent and temporary structures is provided for erosion sections of riverside roads in mountainous areas. The temporary bridge also includes a small box girder, a steel cap beam, and steel piers. The steel piers are positioned between two concrete piers, and the steel cap beam is positioned on top of the steel piers. The top of the steel cap beam is supported by pot bearings for the I-beams and the first steel strand. The small box girder is laid on a steel plate along the roadbed.

[0017] Furthermore, the steel support is composed of several steel casings stacked and connected vertically, and the inner cavity of the steel casing is filled with concrete columns.

[0018] The bottom of the steel support pier is integrally cast with a concrete base.

[0019] A combined permanent and temporary bridge and its construction method for eroded sections of riverside roads in mountainous areas: The implementation of a combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas includes the following steps:

[0020] S1. Use a pontoon bridge to transport construction equipment such as excavators and crushers to the road section that cannot be driven. Simultaneously excavate anchor foundation pits on both road sections. Then place steel cages in the anchor foundation pits and pour concrete ground anchors. Multiple holes are reserved at the top of the concrete ground anchors.

[0021] S2. The mud and rocks in the eroded section are cleared by boat excavation, the cross-sections of the two roadbeds are cleaned, the steel cage is hoisted to the original roadbed cross-section and fixed with anchor rods, the formwork is closed, and concrete is poured to form concrete supports. Multiple holes are also reserved on the top of the concrete supports.

[0022] S3. Pass both ends of several first steel strands through the holes of the concrete supports on both sides and the holes of the concrete ground anchors in sequence, and use prestressed anchors to tighten the first steel strands and fix them to the concrete ground anchors.

[0023] S4. Close the formwork and pour the concrete floor, and pour several of the first steel strands together with the concrete floor;

[0024] S5. Drill holes at intervals along the plane where the first steel strands are located on one side of the mountain, insert one end of the I-beams into the drilled holes, and use a locking buckle to fix the I-beams and the corresponding first steel strands perpendicularly.

[0025] S6. Lay a steel plate flat on the I-beam and fix it to the I-beam. Connect the steel plate to the original roadbed at both ends, and then weld multiple threaded steel bars at intervals on the steel plate.

[0026] S7. Concrete columns are cast integrally at the left and right ends of the two concrete supports. At the same time, two rows of steel columns are symmetrically welded on the I-beams along the road. Multiple second steel strands are tightened and fixed to the concrete columns on both sides of the road by prestressed anchors. Several second steel strands are fixed to the corresponding steel columns by locking buckles.

[0027] S8. As required by the design, one or more sets of concrete bases are poured between the two concrete supports. Steel casings are vertically installed on the concrete bases, and concrete is poured inside the steel casings to form steel supports.

[0028] S9. A steel cap beam is installed on the steel pier, and multiple pot bearings are installed on the steel cap beam to support the I-beam and the first steel strand.

[0029] S10. Lay the corresponding number of small box girders on the steel plate according to the number of steel piers, lay the bridge deck system on the small box girders, and then connect the two sections of highway with the bridge deck system.

[0030] Furthermore, the adjacent I-beams are spaced 50cm apart, and the adjacent first steel strands are spaced 25cm apart.

[0031] Furthermore, before installing the first and second steel strands, multiple steel wire rubber sleeves need to be fitted onto the first and second steel strands.

[0032] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0033] 1. A temporary bridge for eroded sections of riverside roads in mountainous areas, used to temporarily connect sections of the original roadbed that have been eroded. A first treatment structure and a second treatment structure are respectively set at the two roadbed sections to be connected to form a stable support structure. Simultaneously, several first steel strands are horizontally spaced, with both ends of each first steel strand connected to the first and second treatment structures using prestressed anchors, forming the main load-bearing structure supporting the bridge body. One end of an I-beam is embedded in the mountainside, and the intersections of the first steel strands and the I-beams are connected by interlocking fasteners. The I-beams and the first steel strands are intersected to form a mesh structure, constituting a stable support surface. Steel plates and anti-slip threaded steel bars are then laid on the I-beam surface, and steel cable railings are installed to form a temporary bridge for rapid repair and traffic restoration, allowing pedestrians and vehicles to pass, thus meeting the needs of emergency rescue missions.

[0034] 2. A combination of temporary and permanent bridges for eroded sections of riverside roads in mountainous areas. After the emergency repair work is completed, the temporary bridge is further reinforced, small box girders are laid according to actual needs and connected to the original road, and a corresponding number of steel piers are set according to design requirements to form a permanent bridge. There is no need to demolish the original temporary bridge, which improves efficiency and utilization. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A structural schematic diagram of a temporary bridge for eroded sections of a riverside road in a mountainous area, provided by the present invention;

[0037] Figure 2 for Figure 1 Enlarged view of point B in the middle;

[0038] Figure 3 for Figure 1 Schematic diagram of the cross-section at point AA;

[0039] Figure 4 for Figure 3 Enlarged view of point C in the middle;

[0040] Figure 5 This is a structural schematic diagram of a first embodiment of a permanent-temporary combined bridge for erosion sections of riverside roads in mountainous areas, provided by the present invention.

[0041] Figure 6 This is a schematic diagram of a second embodiment of a permanent-temporary combined bridge for erosion sections of riverside roads in mountainous areas, provided by the present invention.

[0042] Figure 7 for Figure 6 Schematic diagram of the cross-section at point DD;

[0043] Icons: 1. First treatment structure, 2. Second treatment structure, 3. First steel strand, 4. I-beam, 5. Prestressed anchor, 6. Mountain, 7. Lock, 71. U-shaped clamp, 72. Steel wire rubber sleeve, 73. Spring washer, 74. Nut, 8. Steel cable railing, 81. Concrete column, 82. Steel column, 83. Second steel strand, 9. Steel plate, 10. Concrete support, 11. Concrete ground anchor, 12. Concrete floor, 13. Threaded steel bar, 14. Small box girder, 15. Steel cap beam, 16. Steel support, 17. Steel casing, 18. Concrete base. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] Reference Figures 1 to 4As shown, this embodiment provides a temporary bridge for eroded sections of a riverside road in mountainous areas, used to temporarily connect sections of the original roadbed that have been eroded. It includes a first treatment structure 1, a second treatment structure 2, a plurality of first steel strands 3, and a plurality of I-beams 4. The first treatment structure 1 and the second treatment structure 2 are respectively set at the two roadbed sections to be connected to form a stable support structure. The plurality of first steel strands 3 are horizontally spaced, and both ends of the first steel strands 3 are connected to the first treatment structure 1 and the second treatment structure 2 respectively by prestressed anchors 5 to form the main load-bearing structure supporting the bridge body.

[0047] More specifically, several I-beams 4 are horizontally spaced on several first steel strands 3, with the I-beams 4 and the first steel strands 3 perpendicular to each other. One end of the I-beam 4 is embedded in the mountain 6, and the intersection of the first steel strands 3 and the I-beam 4 is connected by a locking buckle 7. The I-beams 4 and the first steel strands 3 are intersected to form a mesh structure, which constitutes a stable support surface. At the same time, the insertion of one end of the I-beam 4 into the mountain can also share part of the weight of the bridge, making the temporary bridge more stable.

[0048] More specifically, it also includes two cable railings 8, which are symmetrically arranged along the centerline of the roadbed. The two ends of the cable railings 8 are connected to the first treatment structure 1 and the second treatment structure 2, respectively, and the middle part of the cable railings 8 is connected to the I-beam 4. The cable railings 8 are used to prevent pedestrians and vehicles from falling, and also to reinforce the two sides of the bridge.

[0049] More specifically, such as Figure 1-4 As shown, a layer of steel plate 9 is horizontally spliced ​​on several I-beams 4 to form the basic road surface. The two ends of the steel plate 9 along the roadbed are connected to the original highway to facilitate the movement of people and vehicles. The upper surface of the steel plate 9 is provided with anti-slip texture, and the steel plate 9 is located between two steel cable railings 8.

[0050] like Figure 1-4 As shown, the first treatment structure 1 and the second treatment structure 2 are identical and symmetrically arranged.

[0051] The first treatment structure 1 includes concrete piers 10, concrete anchors 11, and concrete floor 12. The concrete piers 10 and concrete anchors 11 are spaced apart. The concrete piers 10 are located at the ends of the eroded sections of the original roadbed to prevent roadbed collapse and to act as retaining walls and initial load-bearing structures. The concrete anchors 11 are embedded in the original roadbed and connected to the first steel strand 3, which tightly anchors both ends of the first steel strand 3, thereby enabling the first steel strand 3 to provide good support for the bridge. At the same time, the concrete floor 12 connects the tops of the concrete piers 10 and the concrete anchors 11, forming a stable support and anchoring foundation for the bridge.

[0052] More specifically, the two ends of the first steel strand 3 pass through the concrete support 10, the concrete floor 12 and the concrete ground anchor 11 in sequence, and the prestressed anchor 5 is embedded in the end of the concrete ground anchor 11 away from the concrete support 10.

[0053] like Figure 1-3 As shown, in specific implementation, the steel cable railing 8 includes two concrete columns 81, several steel columns 82 and several second steel strands 83. The two concrete columns 81 are cast integrally with the two concrete supports 10 respectively, and the several steel columns 82 are spaced on several I-beams 4.

[0054] Several second steel strands 83 are horizontally arranged and distributed at intervals along the vertical direction. Both ends of the second steel strands 83 are connected to two concrete columns 81 respectively through prestressed anchors 5. The second steel strands 83 are fixed to several steel columns 82 respectively through several locking buckles 7.

[0055] like Figure 4 As shown, the latch 7 includes a U-shaped clamp 71, a steel wire rubber sleeve 72, a spring washer 73 and a nut 74. Several steel wire rubber sleeves 72 are spaced on both the first steel strand 3 and the second steel strand 83. The steel wire rubber sleeves 72 are placed inside the recess of the U-shaped clamp 71.

[0056] Multiple sets of fixing holes are opened in pairs on both the I-beam 4 and the steel column 82. The two ends of the U-shaped clamp 71 pass through the fixing holes and are fitted with spring washers 73. Multiple nuts 74 are threaded to both ends of the U-shaped clamp 71, thereby fixing the first steel strand 3 vertically to the I-beam 4 and the second steel strand 83 vertically to the steel column 82, forming a stable support structure.

[0057] More specifically, multiple threaded steel bars 13 are spaced apart on the steel plate 9. The threaded steel bars 13 are parallel to the I-beam 4. In practice, the threaded steel bars 13 have the same function as the anti-slip pattern, mainly to prevent vehicles and pedestrians from slipping.

[0058] Example 1:

[0059] like Figure 5 As shown, a permanent-temporary combined bridge is used for erosion sections of riverside roads in mountainous areas. When the distance between two concrete piers 10 is small, steel piers 16 are not required. Instead, several small box girders 14 can be laid flat on the first treatment structure 1 and the second treatment structure 2. Corresponding supports can also be set at the bottom of the small box girders 14 as needed. After the small box girders 14 are laid, the bridge deck system is laid on top and then connected to the roadbed at both ends to form a permanent bridge.

[0060] Example 2:

[0061] like Figure 6-7As shown, a temporary bridge for eroded sections of mountainous riverside roads is constructed. This temporary bridge includes a small box girder 14, a steel cap beam 15, and steel piers 16. When the distance between two concrete piers 10 is large, one or more sets of steel piers 16 are installed as needed. The steel piers 16 are positioned between the two concrete piers 10, and the steel cap beam 15 is positioned on top of the steel piers 16. The top of the steel cap beam 15 is supported by pot bearings for I-beams 4 and the first steel strand 3, thus providing support for the middle of the bridge. Simultaneously, the small box girder 14 is laid along the roadbed on steel plates 9. After the small box girder 14 is laid, the bridge deck is laid on top, and then connected to the roadbeds at both ends to form a permanently usable bridge.

[0062] More specifically, the steel support 16 is composed of several steel casings 17 stacked and connected vertically, and the inner cavity of the steel casing 17 is filled with concrete columns.

[0063] The bottom of the steel support pier 16 is integrally cast with a concrete base 18, which provides a good supporting foundation for the steel support pier 16.

[0064] like Figure 1-7 As shown, a combined permanent and temporary bridge and its construction method are described. The implementation of a combined permanent and temporary bridge for eroded sections of a mountain riverside road includes the following steps:

[0065] S1. Use a pontoon bridge to transport construction equipment such as excavators and crushers to road sections that cannot be driven. Simultaneously excavate anchor foundation pits on both road sections. Then place steel cages in the anchor foundation pits and pour concrete ground anchors 11. Multiple holes are reserved on the top of the concrete ground anchors 11.

[0066] S2. The mud and rocks in the eroded section are cleared by boat excavation, the cross-sections of the two roadbeds are cleaned, the steel cage is hoisted to the original roadbed cross-section and fixed by anchor rods, the formwork is closed, and concrete is poured to form concrete support 10. Multiple holes are also reserved on the top of concrete support 10.

[0067] S3. Pass both ends of several first steel strands 3 through the holes of the concrete supports 10 on both sides and the holes of the concrete ground anchors 11 in sequence. Use prestressed anchors 5 to tighten the first steel strands 3 and fix them to the concrete ground anchors 11. After laying the first steel strands 3, the overall bearing strength needs to be monitored according to the design requirements. After passing the test, proceed to the next step.

[0068] S4. Close the formwork, place the steel cage, and fix it with anchor rods. Then pour the concrete floor 12. Several first steel strands 3 are poured together with the concrete floor 12.

[0069] S5. Drill holes at intervals along the plane where several first steel strands 3 are located on one side of the mountain body 6, insert one end of several I-beams 4 into the drilled holes, and use locking buckles 7 to fix the I-beams 4 and the corresponding first steel strands 3 perpendicularly.

[0070] S6. Lay steel plate 9 flat on I-beam 4 and fix it to I-beam 4. Connect steel plate 9 to the original roadbed at both ends. Then weld multiple threaded steel bars 13 at intervals on steel plate 9.

[0071] S7. Concrete columns 81 are integrally cast at the left and right ends of the two concrete supports 10. At the same time, two rows of steel columns 82 are symmetrically welded on the I-beam 4 along the road direction. Multiple second steel strands 83 are tightened and fixed to the concrete columns 81 on both sides of the road by prestressed anchors 5. Several second steel strands 83 are fixed to the corresponding steel columns 82 by locking buckles 7.

[0072] S8. According to the design requirements, one or more sets of concrete bases 18 are poured between the two concrete supports 10. A steel casing 17 is vertically installed on the concrete base 18. Concrete is poured inside the steel casing 17 to form a steel support 16.

[0073] S9. A steel cap beam 15 is installed on the steel pier 16, and multiple pot bearings are installed on the steel cap beam 15 to support the I-beam 4 and the first steel strand 3.

[0074] S10. Based on the number of steel piers 16, lay the corresponding number of small box girders 14 on the steel plate 9, lay the bridge deck system on the small box girders 14, and then connect the two sections of highway with the bridge deck system.

[0075] More specifically, the adjacent I-beams 4 are spaced 50cm apart, and the adjacent first strand 3 is spaced 25cm apart.

[0076] Before installing the first steel strand 3 and the second steel strand 83, multiple steel wire rubber sleeves 72 need to be fitted onto the first steel strand 3 and the second steel strand 83.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A temporary bridge for eroded sections of riverside roads in mountainous areas, used to connect sections of the original roadbed that have been eroded, characterized in that... It includes a first treatment structure (1), a second treatment structure (2), a number of first steel strands (3) and a number of I-beams (4). The first treatment structure (1) and the second treatment structure (2) are respectively set at the two roadbed sections to be connected. The number of first steel strands (3) are set horizontally at intervals. Both ends of the first steel strands (3) are connected to the first treatment structure (1) and the second treatment structure (2) respectively by prestressed anchors (5). Several I-beams (4) are horizontally spaced on several first steel strands (3), the I-beams (4) and the first steel strands (3) are perpendicular to each other, one end of the I-beams (4) is embedded in the mountain (6), and the intersection of the first steel strands (3) and the I-beams (4) is connected by a buckle (7). It also includes two cable railings (8), which are symmetrically arranged along the centerline of the roadbed. The two ends of the cable railings (8) are respectively connected to the first treatment structure (1) and the second treatment structure (2), and the middle part of the cable railings (8) is connected to the I-beam (4). A steel plate (9) is horizontally spliced ​​on several of the I-beams (4), and the two ends of the steel plate (9) along the roadbed are connected to the original highway; the upper surface of the steel plate (9) is provided with anti-slip texture, and the steel plate (9) is located between two of the steel cable railings (8); The first processing structure (1) is the same as the second processing structure (2) and is arranged symmetrically to each other; The first treatment structure (1) includes a concrete support (10), a concrete anchor (11), and a concrete floor (12). The concrete support (10) and the concrete anchor (11) are arranged at intervals. The concrete support (10) is located at the end of the eroded section of the original roadbed. The concrete anchor (11) is embedded in the original roadbed. The concrete floor (12) connects the top of the concrete support (10) and the concrete anchor (11). The two ends of the first steel strand (3) pass through the concrete support (10), the concrete floor (12) and the concrete anchor (11) in sequence, and the prestressed anchor (5) is embedded in the concrete anchor (11) at the end away from the concrete support (10).

2. A temporary bridge for eroded sections of riverside roads in mountainous areas according to claim 1, characterized in that, The steel cable railing (8) includes two concrete columns (81), several steel columns (82) and several second steel strands (83). The two concrete columns (81) are cast integrally with the two concrete supports (10), and the several steel columns (82) are spaced apart on several I-beams (4). Several second steel strands (83) are horizontally arranged and distributed at intervals along the vertical direction. Both ends of the second steel strands (83) are connected to two concrete columns (81) respectively through prestressed anchors (5). The second steel strands (83) are fixed to several steel columns (82) respectively through several locks (7).

3. A temporary bridge for eroded sections of riverside roads in mountainous areas according to claim 2, characterized in that, The latch (7) includes a U-shaped clamp (71), a steel wire rubber sleeve (72), a spring washer (73) and a nut (74). Several steel wire rubber sleeves (72) are spaced on both the first steel strand (3) and the second steel strand (83). The steel wire rubber sleeves (72) are placed inside the recess of the U-shaped clamp (71). The I-beam (4) and the steel column (82) are provided with multiple sets of fixing holes in pairs. The two ends of the U-shaped clamp (71) pass through the fixing holes and are fitted with spring washers (73). The two ends of the U-shaped clamp (71) are threaded with multiple nuts (74).

4. A temporary bridge for erosion sections of riverside roads in mountainous areas according to claim 3, characterized in that, Multiple threaded steel bars (13) are spaced apart on the steel plate (9), and the threaded steel bars (13) are parallel to the I-beam (4).

5. A combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas, employing the temporary bridge for eroded sections of riverside roads in mountainous areas as described in claim 4, characterized in that... It also includes a small box girder (14), a steel cap beam (15) and a steel support (16). The steel support (16) is set between two concrete supports (10). The steel cap beam (15) is set on top of the steel support (16). The top of the steel cap beam (15) is supported by a pot bearing for the I-beam (4) and the first steel strand (3). The small box girder (14) is laid on the steel plate (9) along the roadbed direction.

6. A permanent-temporary combined bridge for erosion sections of riverside roads in mountainous areas, as described in claim 5, is characterized in that... The steel support (16) is formed by vertically stacking and connecting several steel casings (17), and the inner cavity of the steel casing (17) is filled with concrete columns; The bottom of the steel support (16) is integrally cast with a concrete base (18).

7. A construction method for a combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas, employing the combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas as described in claim 6, characterized in that... Includes the following steps: S1. Use a pontoon bridge to transport the excavator and crusher to the road section that cannot be driven. Simultaneously excavate anchor foundation pits on the two road sections. Then place a steel cage in the anchor foundation pit and pour concrete ground anchor (11). Multiple holes are reserved on the top of the concrete ground anchor (11). S2. The mud and rocks of the eroded section are cleaned by the ship excavation, the cross sections of the two roadbeds are cleaned, the steel cage is hoisted to the original roadbed cross section and fixed by the anchor rod, the formwork is closed, and the concrete is poured to make a concrete support (10). The top of the concrete support (10) also has multiple holes. S3. Pass both ends of several first steel strands (3) through the holes of the concrete supports (10) and the holes of the concrete ground anchors (11) on both sides at the same time, and use prestressed anchors (5) to tighten the first steel strands (3) and fix them to the concrete ground anchors (11). S4. The formwork is closed and the concrete floor (12) is poured. Several of the first steel strands (3) are poured together with the concrete floor (12). S5. Drill holes at intervals along the plane where the first steel strands (3) are located on one side of the mountain (6), insert one end of the I-beams (4) into the drilled holes, and use a locking buckle (7) to fix the I-beams (4) and the corresponding first steel strands (3) vertically. S6. Lay a steel plate (9) on the I-beam (4) and fix it to the I-beam (4). Connect the steel plate (9) to the original roadbed at both ends. Then weld multiple threaded steel bars (13) at intervals on the steel plate (9). S7. Concrete columns (81) are cast integrally at the left and right ends of the two concrete supports (10). At the same time, two rows of steel columns (82) are symmetrically welded on the I-beam (4) along the road. Multiple second steel strands (83) are tightened and fixed to the concrete columns (81) on both sides of the road by prestressed anchors (5). Several second steel strands (83) are fixed to the corresponding steel columns (82) by locking buckles (7). S8. According to the design requirements, one or more sets of concrete bases (18) are poured between the two concrete supports (10), and steel casings (17) are vertically installed on the concrete bases (18). Concrete is poured inside the steel casings (17) to form steel supports (16). S9. A steel cap beam (15) is set on the steel pier (16), and multiple pot bearings are set on the steel cap beam (15) to support the I-beam (4) and the first steel strand (3). S10. Based on the number of steel piers (16), lay the corresponding number of small box girders (14) on the steel plate (9), lay the bridge deck system on the small box girders (14), and then connect the two sections of highway with the bridge deck system.

8. A construction method for a combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas, as described in claim 7, is characterized in that... The adjacent I-beams (4) are spaced 50cm apart, and the adjacent first steel strands (3) are spaced 25cm apart.

9. A construction method for a combined permanent and temporary bridge for eroded sections of riverside roads in mountainous areas, as described in claim 7, is characterized in that... Before installing the first steel strand (3) and the second steel strand (83), multiple steel wire rubber sleeves (72) need to be put on the first steel strand (3) and the second steel strand (83).

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