Construction method for disaster repair of river bank high and steep gabion cage retaining wall foundation by brushing
By constructing tetrahedral strings and concrete pouring formwork in the river channel, the problem of cavities caused by water erosion in the foundation of gabion retaining walls was solved, achieving efficient repair and improved safety, and avoiding the shortcomings of existing technologies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
- Filing Date
- 2025-12-22
- Publication Date
- 2026-07-21
AI Technical Summary
The existing gabion retaining wall foundations in steep riverbeds have developed cavities beneath the foundations due to water erosion, leading to overall instability and posing safety hazards. Existing repair methods cannot effectively solve this problem, especially in projects with short construction periods, where long-term safety and stability cannot be guaranteed.
During the dry season, tetrahedral strings are constructed in the river channel outside the gabion retaining wall foundation to form a shallow construction area. Concrete pouring templates are erected along the river direction, and boulders are filled and concrete is poured in the shallow area to form a repair foundation that includes tetrahedral strings, concrete pouring templates and boulders filling area. A construction platform is erected using steel frames for operation.
It significantly improves the stability and safety of disaster repair sites, facilitates construction operations, shortens the construction cycle, avoids the shortcomings of direct parabolic filling, and forms a structurally sound repair foundation.
Smart Images
Figure CN121428951B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a construction method, and more particularly to a construction method for the repair of foundation scouring disasters in high and steep gabion retaining walls along rivers, belonging to the technical field of construction technology for water conservancy and hydropower bank slope maintenance projects. Background Technology
[0002] In hydropower construction projects in Southwest China, it is often necessary to set up construction sites along rivers and reservoirs, such as spoil heaps, temporary roads, material yards, and construction workshops. These riverside sites are usually supported by retaining wall structures to prevent soil erosion and ensure site stability. Among them, gabion retaining walls have been widely used due to their advantages such as flexibility, permeability, eco-friendliness, and ease of construction.
[0003] However, existing gabion retaining wall technology has significant shortcomings in dealing with the scouring and erosion effects of water flow on the water-facing side, especially the continuous scouring and erosion caused by floods during the flood season. Designs often focus on the stability of the retaining wall itself, while the design and treatment of the foundation to prevent scouring are often insufficient. A common practice is to simply place the bottom gabions on the original foundation. Under the long-term action of mountain river flow, especially with the continuous scouring and erosion of the corners of the retaining walls, cavities have formed under the foundations of retaining walls at riverside construction sites for hydropower projects, as seen in the downstream site of the Shuangjiangkou Hydropower Station. Once the soil beneath the foundation is gradually eroded to a certain extent, it will inevitably lead to the overall instability of the gabions, resulting in slippage, settlement, or even collapse, seriously threatening the safety of the construction site and personnel and equipment behind them.
[0004] Current technologies for repairing cavitation-induced suspended cavities in reservoirs with low water flow velocities primarily involve reinforcing the foundation with columns outside the cavitated area before backfilling. However, there are no better solutions for steep slopes and rock slopes with high river flow velocities. Especially for projects with short construction periods, the common approach is to use parabolic filling with fixed columns, which fails to completely solve the problem and cannot guarantee the long-term safety and stability of the construction site. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a construction method for the foundation scouring and erosion disaster repair of high and steep gabion retaining walls along rivers, which is convenient to operate and can significantly improve the stability and safety of the disaster repair site.
[0006] The technical solution adopted to solve the above-mentioned technical problems is: a construction method for repairing the foundation of a high and steep gabion retaining wall along a river. The construction method, during the dry season, involves first constructing a shallow construction area including the scoured section in a high-speed river channel outside the foundation of the gabion retaining wall in the scoured area using tetrahedrals. Then, within the shallow construction area, a concrete pouring formwork, narrow on the outside and wide on the inside, is erected along the river direction. Next, boulders are filled in the shallow construction area on both sides of the concrete pouring formwork, followed by concrete pouring for the hollowed-out cavity of the scourted area based on the filled boulders, and concrete pouring for the boulder-filled area. Finally, after curing, a repair foundation for the high and steep gabion retaining wall along the river is obtained, comprising the tetrahedral enclosure structure, the concrete pouring formwork, the hollowed-out cavity concrete, and the boulder-filled area concrete.
[0007] Furthermore, while constructing the shallow construction area, steel frames were prefabricated to serve as construction platforms. Retaining wall toe platforms were set up at the foundation of the gabion cage retaining wall in the shallow construction area. After the shallow construction area was constructed, the steel frames were erected between the tetrahedral string and the retaining wall toe platforms at intervals of 3-8m to form a construction platform containing multiple construction areas. The subsequent concrete pouring, formwork erection, boulders filling, and concrete pouring were all carried out using the construction platform as the operating platform.
[0008] The preferred method of the above scheme is to embed multiple concrete guide pipes in the filling blocks at specified intervals along the water flow direction during the filling process. The cavity concrete of the hollow disaster area is obtained by pouring concrete mortar into the casting cavity formed by the foundation around the hollow disaster area cavity and the adjacent filling blocks through the concrete guide pipes.
[0009] Furthermore, when constructing the shallow water construction area, the tetrahedral string extends at least 3m beyond the erosion disaster area in both upstream and downstream directions, forming an angle of 10° to 20° with the axis of the retaining wall. The distance between the concrete pouring formwork erected along the water flow direction and the outer tetrahedral string does not exceed one-third of the width of the shallow water construction area.
[0010] The preferred method of the above scheme is that the riprap filling and concrete pouring in the shallow construction area are carried out in at least two phases. The filling height of the first phase of riprap is adapted to the water level elevation in the shallow construction area and exceeds the water level by at least 5cm. After the first phase of riprap filling is completed, the cavity concrete of the hollowed-out disaster area is poured through the concrete duct, and the concrete in the gap between the riprap in the first phase is formed at one time to form a combination of the cavity concrete of the hollowed-out disaster area and the concrete of the first phase of riprap filling area. Then, the subsequent phases of riprap filling and subsequent phases of riprap filling area concrete pouring are carried out, and finally the foundation for the repair of the high and steep gabion retaining wall along the river with the same elevation as the toe of the concrete retaining wall is formed.
[0011] Furthermore, during the filling of boulders in each phase, the spaces on both sides of the concrete pouring formwork are filled to the specified height in an alternating manner. During the first phase of concrete pouring, the cavitation cavity concrete in the cavity of the cavitation disaster area and the boulder filling area concrete connected to it located on the inside of the concrete pouring formwork are poured first, and then the boulder filling area concrete on the outside of the concrete pouring formwork is poured.
[0012] The preferred method of the above scheme is to set up a raw material storage site on the top of the gabion cage slope while constructing the shallow beach construction area. The gabion cage is a reinforced gabion cage, and the width of the shallow beach construction area constructed by connecting tetrahedrons does not exceed 2m.
[0013] Furthermore, both the concrete in the cavity of the cavitated disaster area and the concrete in the rubble-filled area are C25 underwater concrete.
[0014] The preferred method of the above scheme is that the tetrahedral string consists of 3-5 tetrahedrals connected together to form a hoisting string.
[0015] Furthermore, C25 underwater concrete is used to fill the spaces between adjacent tetrahedrons, as well as between tetrahedrons and adjacent infill blocks.
[0016] The beneficial effects of this invention are as follows: The construction method provided in this application selects a short period of time during the dry season. First, in the high-speed water flow channel outside the foundation of the gabion retaining wall in the scour disaster area, a shallow construction area including the scour disaster area is constructed by using tetrahedral strings. Then, a concrete pouring formwork with a narrow outer side and a wide inner side is erected in the shallow construction area along the river direction. Next, boulders are filled in the shallow construction area on both sides of the concrete pouring formwork. Concrete is poured into the cavity of the scour disaster area based on the filled boulders, and concrete is poured into the boulder filling area. Finally, after curing, a repair foundation for the high and steep gabion retaining wall along the river is obtained, which includes the tetrahedral string structure, the concrete pouring formwork, the cavity concrete of the scour disaster area, and the concrete of the boulder filling area. Because the construction method of this application does not require driving piles outside the eroded disaster area beforehand, or directly using parabolic methods to repair the cavities of the eroded area's bank slope, but instead first encloses the shallow construction area, and then fills the shallow construction area with boulders and pours concrete to form a structurally sound foundation for the repair of the high and steep gabion retaining wall along the river, which includes a tetrahedral enclosing structure, concrete pouring formwork, cavities of the eroded disaster area, and concrete in the boulders filling area, it is not only convenient to operate, but also significantly improves the stability and safety of the disaster repair site. It solves the technical problems of existing technologies that are impossible to construct, have high construction costs, or cannot guarantee the construction period during the flood season. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the foundation of the high and steep gabion retaining wall along the river, which is involved in the construction method for the repair of the foundation scour disaster of the high and steep gabion retaining wall along the river in this invention. Figure 2 This is a schematic diagram of the location and structure of the foundation of the high and steep gabion retaining wall in the river or reservoir area involved in the construction method of the present invention for the repair of the foundation scour of the high and steep gabion retaining wall in the river. Figure 3 This is a top view of the modified gabion retaining wall foundation involved in the construction method of the present invention for the repair of scour disasters in the foundation of a high and steep gabion retaining wall along a river.
[0018] The following are marked in the diagram: 1. Tetrahedral string; 2. Concrete pouring formwork; 3. Hollow concrete cavity in the disaster area; 4. Steel frame; 5. Shallow construction area; 6. Retaining wall toe platform; 7. Concrete in the rubble filling area; 8. Gabion cage slope; 9. Raw material storage construction site; 10. Construction platform; 11. High-speed waterway. Detailed Implementation
[0019] like Figure 1 , Figure 2 as well as Figure 3This invention illustrates a construction method for repairing the foundation of a high and steep gabion retaining wall along a river, which is convenient to operate and significantly improves the stability and safety of the repaired area. During the dry season, the method involves first constructing a shallow construction area 5, including the scoured section, in a high-speed river channel 11 outside the gabion retaining wall foundation in the scoured area using tetrahedral strings 1. Then, within the shallow construction area 5, a concrete pouring formwork 2, narrow on the outside and wide on the inside, is erected along the river direction. Next, boulders are filled into the shallow construction area 5 on both sides of the concrete pouring formwork 2. Then, concrete 3 is poured into the cavity of the scoured area based on the filled boulders, and concrete 7 is poured into the boulder-filled area. Finally, after curing, a repair foundation for the high and steep gabion retaining wall along a river is obtained, comprising the tetrahedral string enclosure structure, the concrete pouring formwork 2, the scoured area cavity concrete 3, and the boulder-filled area concrete 7. The construction method provided in this application selects a short period of time during the dry season. First, in the high-speed water flow channel 11 outside the foundation of the gabion retaining wall in the scour disaster area, a shallow construction area including the scour disaster area is constructed by using tetrahedrals. Then, in the shallow construction area, a concrete pouring formwork with a narrow outer side and a wide inner side is erected along the river direction. Next, rubble filling, concrete pouring of the cavity of the scour disaster area based on the filled rubble, and concrete pouring of the rubble filling area are carried out in the shallow construction area on both sides of the concrete pouring formwork. Finally, after curing, a repair foundation for the high and steep gabion retaining wall along the river is obtained, which includes the tetrahedral enclosing structure, the concrete pouring formwork, the cavity concrete of the scour disaster area, and the concrete of the rubble filling area. Because the construction method of this application does not require driving piles outside the eroded disaster area beforehand, or directly using parabolic methods to repair the cavities of the eroded area's bank slope, but instead first encloses the shallow construction area, and then fills the shallow construction area with boulders and pours concrete to form a structurally sound foundation for the repair of the high and steep gabion retaining wall along the river, which includes a tetrahedral enclosing structure, concrete pouring formwork, cavities of the eroded disaster area, and concrete in the boulders filling area, it is not only convenient to operate, but also significantly improves the stability and safety of the disaster repair site. It solves the technical problems of existing technologies that are impossible to construct, have high construction costs, or cannot guarantee the construction period during the flood season. Meanwhile, to facilitate construction, this application prefabricates steel frames 4 for use as construction platforms 10 while enclosing the shallow construction area. Retaining wall toe platforms 6 are set up at the foundation of the gabion cage retaining wall in the shallow construction area. After the shallow construction area 5 is enclosed, the steel frames 4 are erected between the tetrahedral string 1 and the retaining wall toe platforms 6 at intervals of 3-8m to form a construction platform 10 containing multiple construction areas. The subsequent erection of concrete pouring formwork 2, filling of boulders and pouring of concrete are all carried out on the construction platform 10 as the operating platform.
[0020] Accordingly, in light of the specific circumstances of the technical solution of this application, in order to facilitate the formation of at least an integral structure of the hollow disaster zone cavity concrete 3 and the first-stage rubble filling zone concrete 7, this application embeds multiple concrete guide pipes in the filling rubble at specified intervals along the water flow direction during rubble filling. The hollow disaster zone cavity concrete 3 is obtained by pouring concrete mortar into the casting cavity surrounded by the hollow disaster zone cavity foundation and the adjacent filling rubble through the concrete guide pipes. The specific construction process is as follows: the rubble filling and concrete pouring in the shallow construction area 5 are carried out in at least two phases. The rubble filling height in the first phase is adapted to the water level elevation in the shallow construction area 5 and exceeds the water level by at least 5 cm. After the first phase of rubble filling is completed, the hollowed-out disaster area cavity concrete 3 is poured through a concrete tremie pipe, and the concrete in the gaps between the rubble filling in the first phase is poured in one go to form a joint between the hollowed-out disaster area cavity concrete 3 and the first phase rubble filling area concrete. Then, the subsequent phases of rubble filling and subsequent phases of rubble filling area concrete 7 are poured, finally forming the foundation for the repair of the high and steep gabion retaining wall along the river, which is consistent with the toe elevation of the concrete retaining wall. More specifically, during the rubble filling in each phase, the spaces on both sides of the concrete pouring template 2 are filled to the specified height in an alternating manner. During the first phase of concrete pouring, the hollowed-out disaster area cavity concrete 3 in the hollowed-out disaster area cavity and the rubble filling area concrete 7 connected to it and located inside the concrete pouring template 2 are poured first, and then the rubble filling area concrete 7 outside the concrete pouring template is poured.
[0021] Furthermore, this application also provides specific construction procedures for the enclosure of the shallow water construction area. Specifically, when enclosing the shallow water construction area 5, the tetrahedral string 1 extends at least 3 meters beyond the erosion disaster area in both upstream and downstream directions, forming an angle of 10° to 20° with the retaining wall axis. The distance between the concrete pouring formwork 2, erected along the water flow direction, and the outer tetrahedral string 1 does not exceed one-third of the width of the shallow water construction area 5. Simultaneously with the enclosure of the shallow water construction area 5, a raw material storage area 9 is set up at the top of the gabion cage slope 8. The gabion cage is a reinforced gabion cage, and the width of the shallow water construction area 5 enclosed by the tetrahedral string 1 does not exceed 2 meters.
[0022] Furthermore, considering the existing technology and the specific requirements of disaster restoration, the concrete 3 in the hollowed-out disaster area cavity and the concrete 7 in the rubble-filled area of this application are both C25 underwater concrete. The tetrahedral string 1 consists of 3-5 tetrahedrals connected to form a hoisting string. C25 underwater concrete is also used to fill the spaces between adjacent tetrahedrals and between a tetrahedral and an adjacent rubble.
[0023] In summary, the technical solution provided in this application also has the following advantages: 1) The construction method proposed in this invention effectively solves the safety hazard caused by the formation of cavities under the foundation of existing hydropower projects located near rivers during the construction period due to the long-term action of water flow. It fills the cavities under the foundation and reinforces the retaining wall foundation.
[0024] 2) The tetrahedral string of the present invention needs to be extended upstream by 3 to 5 meters and form a certain angle of about 10 to 20 degrees with the axis of the retaining wall. This can guide the water flow as much as possible to the center of the river and extend downstream of the reinforcement treatment area. This provides a construction environment for underwater concrete pouring with tetrahedral string enclosure and reduces the scouring effect of the water flow. At the same time, the tetrahedral string at the rear serves as part of the anti-scouring structure, effectively blocking the high-velocity water flow area and preventing the high-speed water flow from impacting and scouring the foundation of the retaining wall.
[0025] 3) The construction method proposed in this invention forms several construction platforms between the tetrahedron and the gabion retaining wall as temporary manual or small mechanical construction platforms, forming several construction areas. This allows for simultaneous construction, greatly accelerating the construction progress, shortening the construction period, and making full use of the low water level period during the dry season.
[0026] 4) The concrete pouring formwork of the present invention on the riverside not only plays a role in shaping and supporting the poured concrete, but also plays a certain role in blocking the water flow, so as to form a certain static water construction condition in the reinforcement area, avoid the diversion and pollution of concrete materials, and ensure the quality and efficiency of concrete pouring.
[0027] 5) The overall structure of this invention provides good anti-scouring and stabilizing effects for each component. The tetrahedral string effectively blocks high-speed water flow zones. The block stone group structure and the block stone group concrete structure further strengthen the stability of the retaining wall foundation. The cavity backfill concrete structure effectively fills the foundation cavity, preventing structural settlement and deformation. The final overall load-bearing structure system has high protective strength, is safe and convenient to construct, and has good adaptability to riverside construction sites where the retaining wall foundation is constantly under the action of water flow. It also has good anti-scouring and overall anti-sliding stability effects.
[0028] The technical solution of this application will be further described below through specific embodiments: To address the safety hazards caused by cavities forming beneath the foundations of existing hydropower project construction sites along rivers due to long-term water flow, this invention provides a scientifically designed, simple to construct, low-cost, and effective structure and construction method for reinforcing gabion retaining wall foundations along rivers, which also offers significant repair and anti-scour effects.
[0029] The technical solution adopted by this invention to solve its technical problem is: a construction method for the anti-scouring and reinforcement layout structure of gabion retaining wall foundation at a riverside construction site, comprising the following steps: S1. Determine the scope of the gabion retaining wall foundation anti-scour reinforcement at the construction site, and prefabricate several steel frames to serve as construction platforms; S2. Construction of the tetrahedral string retaining area. Construction begins during the dry season of the river. Using a large crane, tetrahedral strings are hoisted and installed on the outside of the retaining wall foundation, forming a cavity. The tetrahedral strings need to extend 3-5 meters upstream, forming an angle of approximately 10-20 degrees with the retaining wall axis. They are then continued downstream of the reinforcement area, extending 3-5 meters downstream, thus forming a tetrahedral string retaining area. S3. Construct steel frame construction platforms. Use large cranes to lift the steel frame on the construction site, forming several construction platforms between the tetrahedron and the gabion retaining wall as temporary platforms for manual or small machinery construction operations. The construction platforms are spaced 3-8m apart, forming several construction areas. S4. Construct formwork for the concrete pouring on the riverside. Install formwork fixing components and concrete formwork on the steel frame construction platform. The formwork should be at least 50cm away from the corners of the tetrahedron and at least 1m away from the retaining wall foundation. S5. Construct riprap. Riprap construction is carried out in two phases. In the first phase, during the dry season when the water level is low (H1), riprap is simultaneously constructed on both sides of the formwork. When the riprap is slightly higher than H1, concrete is poured into the retaining wall foundation cavity through concrete guide pipes embedded in the gaps between the riprap. Pouring is stopped when the concrete reaches the same elevation as the riprap filling. In the second phase, riprap is simultaneously constructed on both sides of the formwork until it reaches the toe elevation of the retaining wall, and concrete is poured to the toe elevation.
[0030] In addition, the present invention also provides a reinforcement arrangement structure for the foundation of a gabion retaining wall at a riverside construction site to prevent scouring and erosion. This structure is formed by the construction of the aforementioned reinforcement arrangement structure for the foundation of a gabion retaining wall at a riverside construction site. It includes a gabion retaining wall foundation body, a gabion construction site located on top of the body, and further includes a cavity backfill concrete structure, a boulders concrete structure, a concrete pouring template, a boulders structure, a tetrahedron string, and a steel frame construction platform. The cavity backfill concrete structure is located below the retaining wall foundation body; the boulders concrete structure is connected to the retaining wall foundation body and is at the same elevation as the toes of the retaining wall foundation body; the concrete pouring template is connected to the boulders concrete structure and is at the same elevation as the toes of the retaining wall foundation body; the boulders structure is connected to the concrete pouring template and is at the same elevation as the toes of the retaining wall foundation body; the tetrahedron string is connected to the boulders structure; and the steel frame construction platform is erected on the toes of the retaining wall foundation body and the tetrahedrons.
Claims
1. A construction method for repairing foundation scouring disasters in high and steep gabion retaining walls along rivers, characterized by: The construction method described above involves first constructing a shallow construction area (5) including the scour disaster section in the high-speed water flow channel (11) outside the foundation of the gabion retaining wall in the scour disaster area using tetrahedral strings (1). Then, a concrete pouring template (2) with a narrow outer side and a wide inner side is erected in the shallow construction area (5) along the direction of the river. Next, boulders are filled in the shallow construction area (5) on both sides of the concrete pouring template (2), and the cavity concrete (3) of the scour disaster area based on the filled boulders and the concrete (7) of the boulder filling area are poured. Finally, after curing, a repair foundation for the high and steep gabion retaining wall along the river is obtained, which includes the tetrahedral string enclosure structure, the concrete pouring template (2), the cavity concrete (3) of the scour disaster area, and the concrete (7) of the boulder filling area.
2. The construction method for repairing foundation scouring disasters of high and steep gabion retaining walls along rivers, as described in claim 1, is characterized in that: While constructing the shallow construction area, steel frames (4) are prefabricated for use as construction platforms (10). Retaining wall toe platforms (6) are set up at the foundation of the gabion cage retaining wall in the shallow construction area. After the shallow construction area (5) is constructed, each steel frame (4) is erected between the tetrahedral string (1) and the retaining wall toe platform (6) at a spacing of 3-8m to form a construction platform (10) containing multiple construction areas. The subsequent erection of concrete pouring formwork (2), filling of boulders and pouring of concrete are all carried out on the construction platform (10) as the operating platform.
3. The construction method for disaster repair of foundation scouring of high and steep gabion retaining walls along rivers, as described in claim 1 or 2, is characterized in that: When filling the boulders, multiple concrete pipes are buried in the boulders at specified intervals along the direction of water flow. The cavity concrete of the hollow disaster area (3) is obtained by pouring concrete mortar into the cavity formed by the foundation around the hollow disaster area cavity and the adjacent boulders through the concrete pipes.
4. The construction method for disaster repair of foundation scouring of high and steep gabion retaining walls along rivers according to claim 3, characterized in that: When constructing the shallow construction area (5), the tetrahedral string (1) extends at least 3m beyond the erosion disaster area in both upstream and downstream directions, and forms an angle of 10° to 20° with the axis of the retaining wall. The distance between the concrete pouring formwork (2) erected along the direction of water flow and the outer tetrahedral string (1) does not exceed one-third of the width of the shallow construction area (5).
5. The construction method for repairing foundation scouring disasters of high and steep gabion retaining walls along rivers, as described in claim 4, is characterized in that: The boulders filling and concrete pouring in the shallow construction area (5) are carried out in at least two phases. The filling height of the first phase of boulders is adapted to the water level elevation in the shallow construction area (5) and exceeds the water level by at least 5cm. After the first phase of boulders filling is completed, the cavity concrete (3) of the cavitation disaster area and the concrete in the gap between the boulders in the first phase are poured through the concrete pipe to form a joint of the cavity concrete (3) of the cavitation disaster area and the concrete of the first phase of boulders filling area. Then, the subsequent phases of boulders filling and the subsequent phases of boulders filling area concrete (7) are poured. Finally, the foundation for the repair of the high and steep gabion cage retaining wall along the river with the same elevation as the toe of the concrete retaining wall is formed.
6. The construction method for repairing foundation scouring disasters of high and steep gabion retaining walls along rivers, as described in claim 5, is characterized in that: During the filling of boulders in each phase, the spaces on both sides of the concrete pouring template (2) are filled to the specified height in an alternating manner. During the first phase of concrete pouring, the hollowed-out disaster area cavity concrete (3) in the cavity of the hollowed-out disaster area and the boulder filling area concrete (7) connected to it located inside the concrete pouring template (2) are poured first, and then the boulder filling area concrete (7) outside the concrete pouring template is poured.
7. The construction method for disaster repair of foundation scouring of high and steep gabion retaining walls along rivers according to claim 6, characterized in that: While constructing the shallow construction area (5), a raw material storage site (9) is set up on the top of the gabion cage slope (8). The gabion cage is a reinforced gabion cage, and the width of the shallow construction area (5) constructed by the tetrahedral string (1) does not exceed 2m.
8. The construction method for repairing foundation scouring disasters of high and steep gabion retaining walls along rivers, as described in claim 7, is characterized in that: The cavity concrete (3) in the cavitation disaster area and the rubble filling concrete (7) are both C25 underwater concrete.
9. The construction method for repairing foundation scouring disasters of high and steep gabion retaining walls along rivers, as described in claim 8, is characterized in that: A tetrahedral string (1) consists of 3-5 tetrahedrals connected together to form a hoisting string.
10. The construction method for repairing the foundation scouring disaster of a high and steep gabion retaining wall near a river, as described in claim 9, is characterized in that: The spaces between adjacent tetrahedrons, as well as between a tetrahedron and an adjacent infill stone, are filled with C25 underwater concrete.