Drainage and slope protection system for high-steep rocky slopes

Abstract

The present invention discloses a drainage slope protection system, in particular a drainage slope protection system for high-steep rocky slopes, belonging to the technical field of design and construction of hydropower engineering buildings. The present invention also discloses a construction method for the drainage slope protection system. There is provided a drainage slope protection system for high-steep rocky slopes and its construction method with relatively less construction difficulty and significantly reduced construction excavation volume. The drainage slope protection system includes a slope protection structure, and the drainage slope protection system further includes a water collection and drainage structure, and the water collection and drainage structure is arranged at the middle and lower parts of the slope body at an angle of 30 to 35 degrees with the slope surface protected by the slope protection structure. The construction method includes steps of constructing the framework steel bars, fixing the mesh steel bars on the upper part of the exposed part of the framework steel bars by connecting stirrups, spraying concrete on the slope and the drainage ditch, and drilling drainage holes on the slope.

Description

Technical Field

[0001] The present invention relates to a drainage and slope protection system, in particular to a drainage and slope protection system for high-steep rocky slopes, belonging to the technical field of design and construction of hydropower engineering buildings. The present invention also relates to a construction method for the drainage and slope protection system. Background Art

[0002] Side slope drainage ditches are common treatment measures in slope engineering. Together with intercepting ditches, slope shotcrete, and slope drainage holes, they jointly form a slope interception, prevention, and drainage network, which plays a very important role in reducing the water content inside the slope body, reducing the seepage pressure inside the slope body, and ensuring that the inside of the slope is in a drained and stable state.

[0003] Currently, most high-steep rocky slopes adopt a conventional drainage ditch layout scheme of first excavation and then masonry, such as Figure 1 , Figure 2 as shown. The characteristics of this structure are: 1) The slope drainage and protection system consists of shotcrete, drainage holes, and drainage ditches; 2) The drainage ditch is arranged on a platform formed by excavating the natural terrain line of the slope, and the platform is set with a certain slope leading to one side; 3) A concrete side wall is set outside the platform and is anchored to the rock mass under the platform by inserting steel bars; 4) Shotcrete is set at the bottom of the platform and the inner slope. The advantages of this structure are: relatively reliable structure and better drainage effect. The main problems of this structure are: 1) Due to the high steepness of the terrain, the height of the excavation slope formed by the platform excavation is relatively high and the excavation volume is large; 2) When conducting platform excavation blasting operations on high-steep slopes with relatively poor geological conditions, it may cause certain disturbances to the slope rock mass and reduce the stability of the slope; 3) When the height difference between the platform and the ground or the construction platform is relatively large, the pouring construction difficulty of the concrete side wall outside the platform is also relatively large. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a drainage and slope protection system for high-steep rocky slopes with relatively small construction difficulty and significantly reduced construction excavation volume. The present application also provides a construction method for the drainage and slope protection system.

[0005] The technical solution adopted to solve the above technical problem is: A drainage and slope protection system for high-steep rocky slopes includes a slope protection structure. The drainage and slope protection system further includes a water collection and drainage structure, and the water collection and drainage structure is arranged at the middle and lower parts of the slope body at an angle of 30-35 degrees with the slope surface protected by the slope protection structure.

[0006] Further, the slope protection structure is a concrete layer sprayed on the slope surface of the high-steep rocky slope after cleaning the loose soil and rock layer.

[0007] Preferably, drainage holes extending into the high-steep rocky slope body are also provided in the concrete layer, and the outlets of the drainage holes are arranged obliquely downward in the high-steep rocky slope body.

[0008] Furthermore, the water collection and drainage structure includes a support connection framework, a fixed support component, and a water collection and drainage ditch component. The water collection and drainage ditch component is arranged in the middle and lower parts of the slope body through the support connection framework with the cooperation of the fixed support component.

[0009] Preferably, the support connection framework includes at least one row of inclined framework reinforcing bars inserted into the middle and lower parts of the slope body, and the fixed support component is arranged on the part of the framework reinforcing bars protruding from the slope body.

[0010] Furthermore, the fixed support component includes mesh steel bars and connecting stirrups. The water collection and drainage ditch component is supported on the mesh steel bars, and the mesh steel bars are connected to the framework reinforcing bars through the connecting stirrups.

[0011] Preferably, the water collection and drainage ditch component is a concrete spray coating attached to the mesh steel bars, and the thickness of the concrete spray coating is between 10 and 15 cm.

[0012] Furthermore, each of the framework reinforcing bars is inserted obliquely downward along the length direction of the slope into the high-steep rocky slope body as a whole.

[0013] A construction method for the drainage and slope protection system, the construction method includes steps of constructing the framework reinforcing bars, fixing the mesh steel bars on the upper part of the exposed part of the framework reinforcing bars by connecting stirrups, spraying concrete on the slope and the drainage ditch, and drilling drainage holes on the slope.

[0014] Furthermore, the loose soil and stone on the natural terrain line of the slope are cleaned before constructing the framework reinforcing bars.

[0015] The beneficial effects of the present invention are as follows: By adding a water collection and drainage structure on the basis of the existing slope protection structure to form the drainage and slope protection system, and then directly arranging the water collection and drainage structure at an angle of 30-35 degrees with the slope surface protected by the slope protection structure in the middle and lower parts of the slope body. In this way, when constructing the drainage and slope protection system, it is no longer necessary to first carry out rock wall excavation, but directly first carry out the construction of the skeleton reinforcing bars, and then fix the mesh steel bars on the upper part of the exposed part of the skeleton reinforcing bars by stirrups. Then, the construction of slope and drainage ditch shotcrete and the construction of slope drainage holes can be quickly completed, thereby effectively reducing the construction difficulty, significantly reducing the construction excavation volume, achieving the purpose of reducing construction costs and improving construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the existing slope drainage ditch related to the present invention;

[0017] Figure 2 is Figure 1 A-A cross-sectional view of;

[0018] Figure 3 It is a schematic structural diagram of the drainage and slope protection system for high-steep rock slopes of the present invention;

[0019] Figure 4 is Figure 3 B-B cross-sectional view of.

[0020] The marks in the figure are: slope protection structure 1, water collection and drainage structure 2, slope surface 3, slope body 4, drainage hole 5, support connection skeleton 6, fixed support component 7, water collection and drainage ditch component 8, mesh steel bar 9, connection stirrup 10. DETAILED DESCRIPTION OF THE INVENTION

[0021] Such as Figure 3 , Figure 4Shown is a drainage and slope protection system for high-steep rocky slopes provided by the present invention, which has relatively low construction difficulty and significantly reduced construction excavation volume, as well as a construction method for the drainage and slope protection system. The drainage and slope protection system includes a slope protection structure 1, and the drainage and slope protection system further includes a water collection and drainage structure 2. The water collection and drainage structure 2 is arranged at the middle and lower part of the slope body 4 at an angle of 30-35 degrees with the slope surface 3 protected by the slope protection structure 1. In this application, the drainage and slope protection system is formed by adding a water collection and drainage structure on the basis of the existing slope protection structure. Then, the water collection and drainage structure is directly arranged at the middle and lower part of the slope body at an angle of 30-35 degrees with the slope surface protected by the slope protection structure. In this way, when constructing the drainage and slope protection system, it is no longer necessary to first carry out rock wall excavation. Instead, the construction of the skeleton reinforcing bars can be directly carried out first, and then the mesh steel bars are fixed to the upper part of the exposed part of the skeleton reinforcing bars by stirrups. Then, the construction of slope and drainage ditch shotcrete construction and slope drainage hole drilling construction can be quickly completed, thereby effectively reducing the construction difficulty, significantly reducing the construction excavation volume, achieving the purpose of reducing construction costs and improving construction safety.

[0022] In the above-mentioned embodiment, considering the structural characteristics that the existing slope protection structure 1 is usually a concrete layer sprayed on the high-steep rocky slope surface after cleaning the loose soil and rock layer, in this application, a drainage hole 5 extending into the high-steep rocky slope body is further arranged in the concrete layer. The drainage hole 5 is arranged obliquely upward in the high-steep rocky slope body. Further, in order to minimize the construction workload, reduce the construction difficulty, and at the same time ensure the stability and reliability of the drainage ditch, the water collection and drainage structure 2 in this application includes a support connection skeleton 6, a fixed support component 7, and a water collection and drainage ditch component 8. The water collection and drainage ditch component 8 is arranged at the middle and lower part of the slope body 4 through the support connection skeleton 6 with the cooperation of the fixed support component 7. At this time, the support connection skeleton 6 should include at least one row of skeleton reinforcing bars obliquely inserted into the middle and lower part of the slope body. The fixed support component 7 is arranged on the part of the skeleton reinforcing bars extending out of the slope body 4. The fixed support component 7 can include mesh steel bars 9 and connecting stirrups 10. The water collection and drainage ditch component 8 is supported on the mesh steel bars 9, and the mesh steel bars 9 are connected to the skeleton reinforcing bars through the connecting stirrups 10. The water collection and drainage ditch component 8 is a concrete sprayed layer attached to the mesh steel bars 9, and the thickness of the concrete sprayed layer is between 10-15 cm. Correspondingly, in order to facilitate drainage, each of the skeleton reinforcing bars is obliquely inserted into the high-steep rocky slope body along the slope length direction as a whole. During construction, the loose soil and rock on the natural terrain line of the slope are cleaned before the construction of the skeleton reinforcing bars.

[0023] In summary, the technical solution provided by this application also has the following advantages:

[0024] 1) The implementation plan of the drainage ditch adopts inserted steel bars, mesh steel bars and shotcrete, eliminating the need for slope excavation construction and avoiding the impact of excavation blasting on slope stability.

[0025] 2) The structure composed of inserted steel bars, mesh steel bars and shotcrete, together with the slope shotcrete, forms a closed waterproof triangular channel structure in the cross-section, and a slope direction is set to meet the requirements of slope drainage function.

[0026] 3) Compared with the conventional drainage ditch plan, it avoids the excavation construction of high and steep slopes and the casting construction of concrete retaining walls on platforms with large height differences, making the construction process more convenient and greatly reducing the construction difficulty. Specific embodiments

[0028] The technical problem to be solved by this application is to provide a drainage structure for high and steep slopes and its construction method that can not only meet the requirements of drainage function, but also avoid excavation construction, reduce the disturbance to high and steep slopes, and reduce the construction difficulty.

[0029] The technical solution adopted by this application to solve the technical problem is as follows:

[0030] 1) The slope drainage protection system consists of shotcrete, drainage holes and drainage ditches.

[0031] 2) From bottom to top, the drainage ditch structure is respectively inserted steel bars, mesh steel bars and shotcrete, and a certain slope needs to be set to one side.

[0032] 3) Part of the inserted steel bars penetrate into the natural terrain line, and part is exposed outside the natural terrain line; the azimuth angle of the inserted steel bars is perpendicular to the slope surface direction, and the dip angle forms an angle of 30-35 degrees with the slope surface.

[0033] 4) The adjacent inserted steel bars are connected by mesh steel bars. The bottom of the mesh steel bars is connected to the slope surface shotcrete. The top of the mesh steel bars is slightly lower than the end of the exposed part of the inserted steel bars. The mesh steel bars are fixed on the exposed part of the inserted steel bars by stirrups.

[0034] 5) The shotcrete is arranged above the mesh steel bars, with a thickness of 10-15 cm. The lower part is overlapped with the slope shotcrete, and the upper part does not exceed the end of the exposed part of the inserted steel bars.

[0035] The construction method adopted by this application to solve the technical problem is as follows:

[0036] First, clean the loose soil and stone on the natural terrain line of the slope.

[0037] Second, carry out the construction of the inserted steel bars for the drainage ditch.

[0038] Third, fix the mesh reinforcement to the upper part of the exposed part of the inserted reinforcement with stirrups;

[0039] Fourth, carry out the shotcrete construction on the slope and drainage ditch;

[0040] Finally, carry out the drilling construction of the drainage holes on the slope.

[0041] Embodiment 1

[0042] The technical solution of the present application will be further described below in conjunction with the drawings and embodiments:

[0043] As shown in the figure, the technical solution adopted by the present application to solve the technical problem is:

[0044] a. The slope drainage protection system consists of shotcrete, drainage holes and drainage ditches;

[0045] b. From bottom to top, the drainage ditch structure is respectively inserted reinforcement, mesh reinforcement and shotcrete, and the drainage ditch is set with a certain slope leading to one side;

[0046] c. Part of the inserted reinforcement penetrates into the natural terrain line, and part is exposed outside the natural terrain line; the azimuth angle of the inserted reinforcement is perpendicular to the slope surface of the slope, and the dip angle forms an angle of 30-35 degrees with the slope surface of the slope;

[0047] d. The adjacent inserted reinforcements are connected by mesh reinforcement. The bottom of the mesh reinforcement is connected to the shotcrete on the slope surface. The top of the mesh reinforcement is slightly lower than the end of the exposed part of the inserted reinforcement. The mesh reinforcement is fixed to the exposed part of the inserted reinforcement with stirrups;

[0048] e. The shotcrete is arranged above the mesh reinforcement, with a thickness of 10-15 cm. The lower part is overlapped with the shotcrete on the slope, and the upper part does not exceed the end of the exposed part of the inserted reinforcement.

[0049] The construction method of the present application to solve the technical problem is:

[0050] a. First, clean up the loose soil and stone on the natural terrain line of the slope;

[0051] b. Second, carry out the construction of the inserted reinforcement for the drainage ditch;

[0052] c. Third, fix the mesh reinforcement to the upper part of the exposed part of the inserted reinforcement with stirrups;

[0053] d. Fourth, carry out the shotcrete construction on the slope and drainage ditch;

[0054] e. Finally, carry out the drilling construction of the drainage holes on the slope.

[0055] The beneficial effects of the present application are as follows:

[0056] a. The implementation plan of the drainage ditch uses inserted steel bars, mesh steel bars and shotcrete, eliminating the need for slope excavation construction and avoiding the impact of excavation blasting on slope stability.

[0057] b. The structure composed of inserted steel bars, mesh steel bars and shotcrete, together with the slope shotcrete, forms a closed waterproof triangular channel structure in the cross-section, and a slope guiding side is set to meet the requirements of slope drainage function.

[0058] c. Compared with the conventional drainage ditch plan, it avoids the high and steep slope excavation construction and the casting construction of the concrete retaining wall on the platform with a large height difference. The construction process is more convenient and the construction difficulty is greatly reduced.

[0059] In summary, the high and steep slope drainage structure provided by this application not only meets the drainage function requirements, but also can avoid excavation construction, reduce the disturbance to the high and steep slope, and reduce the construction difficulty.

Claims

1. A water drainage and slope protection system for high-steep rocky slopes, comprising a slope protection structure (1). Characterized in that: The water drainage and slope protection system further comprises a water collection and drainage structure (2), and the water collection and drainage structure (2) is arranged at the middle and lower parts of the slope body (4) at an angle of 30-35 degrees with the slope surface (3) protected by the slope protection structure (1). The slope protection structure (1) is a concrete layer sprayed on the slope surface of the high-steep rocky slope after the loose soil and rock layer is cleared. The water collection and drainage structure (2) comprises a support connection framework (6), a fixed support assembly (7) and a water collection and drainage groove assembly (8), and the water collection and drainage groove assembly (8) is arranged at the middle and lower parts of the slope body (4) through the support connection framework (6) with the cooperation of the fixed support assembly (7). The support connection framework (6) comprises at least one row of inclined skeleton reinforcing bars inserted into the middle and lower parts of the slope body, and the fixed support assembly (7) is arranged on the part of the skeleton reinforcing bars extending out of the slope body (4). The fixed support assembly (7) comprises mesh reinforcement (9) and connecting stirrups (10), the water collection and drainage groove assembly (8) is supported on the mesh reinforcement (9), and the mesh reinforcement (9) is connected to the skeleton reinforcing bars through the connecting stirrups (10). The water collection and drainage groove assembly (8) is a concrete sprayed coating attached to the mesh reinforcement (9), and the thickness of the concrete sprayed coating is between 10 and 15 cm. Each of the skeleton reinforcing bars is inserted obliquely downward along the length direction of the slope into the high-steep rocky slope body as a whole.

2. The water drainage and slope protection system for high-steep rocky slopes according to claim 1. Characterized in that: Drainage holes (5) extending into the high-steep rocky slope body are further arranged in the concrete layer, and the outlets of the drainage holes (5) are arranged obliquely downward in the high-steep rocky slope body.

3. A construction method for the water drainage and slope protection system according to claim 1. Characterized in that: The construction method includes the construction of skeleton reinforcing bars, fixing the mesh reinforcement (9) on the upper part of the exposed part of the skeleton reinforcing bars by using connecting stirrups (10), spraying concrete construction on the slope and the drainage ditch, and drilling construction of slope drainage holes.

4. The construction method according to claim 3. Characterized in that: Before the construction of the skeleton reinforcing bars, the loose soil and rock on the natural terrain line of the slope are cleared first.

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