High slope protection structure of excavation area

Abstract

The utility model relates to a high slope protection structure of an excavation area, which comprises a steel pipe pile unit, a surface protecting wall and an anchor rod type retaining wall which are sequentially arranged from top to bottom, each steel pipe pile unit comprises a graded broken stone hardcore laid on the slope top of the high slope, a net-shaped straining beam arranged on the graded broken stone hardcore and a plurality of grouting miniature steel pipe piles arranged on the graded broken stone hardcore in a penetrating mode. The top ends of the grouting miniature steel pipe piles are arranged on net-shaped joints of the net-shaped straining beam, the bottom ends of the grouting miniature steel pipe piles are fixedly inserted into the high slope, and the surface protecting wall and the anchor rod type retaining wall are arranged relative to the slope face of the high slope and form a step face. Before excavation, the grouting micro steel pipe piles are used for supporting, a supporting system composed of the graded broken stone hardcore and the net-shaped straining beams is used for guaranteeing the safety of engineering buildings such as irrigation ditches at the slope top, the surface protecting wall and the anchor rod type retaining wall are used for assisting to form the step type slope, and the step type slope has the advantages of being stable in structure and convenient to construct.

Description

Technical Field

[0001] This utility model relates to the technical field of high slope protection, and in particular to a high slope protection structure for excavated areas. Background Technology

[0002] For high slopes created after excavation, retaining walls or slope protection structures are typically used alone to prevent damage to buildings from the sliding gravel and soil. This single retaining wall or slope protection structure is only suitable for high slopes with small elevation differences. When the elevation difference is large, for example, 10 meters, if only retaining walls are used, the volume per linear meter of the retaining wall is 12.56 cubic meters (for an inclined retaining wall, with a 40° internal friction angle of the fill material, a base friction coefficient of 0.3, and a uniformly distributed load of 3.5 kPa), resulting in significant infrastructure investment. If only slope protection is used, the slope needs to be divided into several sections with different slope ratios, resulting in a projected area of ​​19 square meters per linear meter, which increases the land area required and the volume of excavated soil.

[0003] Chinese Patent No. CN211772495U discloses a lightweight embankment structure for construction on steep mountain slopes. The lightweight embankment is set on stable rock mass on steep mountain slopes and includes a lower micropile anti-slide support structure, as well as an upper lightweight embankment, anchor rods, retaining walls, and facing walls. The lower micropile anti-slide support structure includes micropiles, a cap beam, and a cap beam anchor rod. The micropiles are vertically and intermittently set in the stable rock mass at the lower part of the steep mountain slope. Several drainage holes are provided at the bottom of the cap beam, which is set on top of the micropiles. The micropiles, cap beam, and cap beam anchor rod are cast-in-place reinforced concrete integral structures. One end of the anchor rod is set in the retaining wall, and the other end is set in the stable rock mass. A drainage mattress layer is provided on the lower side of the lightweight embankment, which is connected to the drainage holes. A step with a reverse slope is provided on the lower side of the drainage mattress layer, which is connected to the drainage holes.

[0004] The existing technical solutions described above have the following drawbacks: While the embankment structures employ anchor bolts, retaining walls, and facing walls for high slope protection, when the top of the slope is close to irrigation canals or other engineering structures, this method occupies significant ground space, potentially impacting the safety of these structures. Furthermore, it hinders the access of large construction equipment, increases construction difficulty, and raises costs. Therefore, providing a structurally stable, easily constructed, and cost-effective high slope protection structure for excavated areas is a pressing issue that needs to be addressed. Utility Model Content

[0005] The problem this utility model aims to solve is to provide a high slope protection structure for excavation areas, which addresses the above-mentioned shortcomings in the existing technology. Before excavation, the slope is supported by grouting micro steel pipe piles to form a stepped slope, which has the advantages of structural stability and convenient construction.

[0006] The above-mentioned objective of this utility model is achieved through the following technical solution:

[0007] A slope protection structure for a high slope in an excavation area includes steel pipe pile units, a facing wall, and an anchored retaining wall arranged sequentially from top to bottom. The steel pipe pile unit includes a graded crushed stone cushion layer laid at the top of the high slope, a mesh tie beam set on the graded crushed stone cushion layer, and multiple grouting micro steel pipe piles passing through the graded crushed stone cushion layer. The top of the grouting micro steel pipe pile is set on the mesh node of the mesh tie beam, and the bottom end is inserted and fixed inside the high slope. The facing wall and the anchored retaining wall are respectively arranged opposite the slope surface of the high slope and form a stepped surface.

[0008] By adopting the above technical solutions, high slopes can be supported first through grouting micro-steel pipe piles during excavation operations. Grouting micro-steel pipe piles have high bearing capacity and deformation resistance, which can effectively improve the stability of high slopes, ensure the safety of irrigation canals and other engineering structures, and prevent safety accidents such as slope collapse. At the same time, the setting of graded crushed stone cushion layer and mesh tie beam can further enhance the integrity and stability of the slope protection structure. During construction, the formation of stepped slopes not only facilitates construction operations but also further improves slope stability. The setting of facing walls and anchored retaining walls can further protect the slope and prevent soil erosion and landslides. In addition, this slope protection structure has the advantages of convenient construction and low cost, and is suitable for high slope support projects in various excavation areas.

[0009] The present invention is further configured such that: multiple grouting holes are opened on the graded crushed stone cushion layer and the high slope; the grouting micro steel pipe pile includes a steel reinforcement bracket arranged at the bottom of the grouting hole, a grouting steel pipe set on the steel reinforcement bracket, a PVC grouting pipe and steel reinforcement inside the steel pipe inserted intermittently on the grouting steel pipe, and a cement mortar pile filled in the grouting hole; the top ends of the grouting steel pipe, the PVC grouting pipe and the steel reinforcement inside the steel pipe extend to the outside of the grouting hole and are inserted and fixed to the mesh tie beam.

[0010] By adopting the above technical solutions, the connection strength between the grouting micro steel pipe piles and the graded crushed stone cushion layer and high slope can be further enhanced, improving the stability and bearing capacity of the entire slope protection structure. The setting of the steel reinforcement bracket can ensure the stable support of the grouting steel pipe at the bottom of the grouting hole, while the grouting steel pipe and PVC grouting pipe can ensure that the grouting material is evenly injected into the grouting hole to form a complete cement mortar pile. In addition, by extending the top of the grouting steel pipe, PVC grouting pipe and the steel reinforcement inside the steel pipe to the outside of the grouting hole and inserting and fixing them to the mesh tie beam, a reliable connection between the grouting micro steel pipe piles and the mesh tie beam can be achieved, further enhancing the integrity and stability of the slope protection structure.

[0011] The present invention is further configured such that: the grouting micro steel pipe pile also includes a plurality of positioning steel bars evenly distributed on the periphery of the grouting steel pipe and abutting against the inner wall of the grouting hole.

[0012] By adopting the above technical solution, the accurate positioning of the grouting micro steel pipe pile in the grouting hole can be ensured, and the grouting steel pipe can be prevented from shifting or tilting during the grouting process. This ensures that the grouting material can fill the entire grouting hole evenly and fully, forming a denser and more stable cement mortar pile.

[0013] The present invention is further configured such that the top of the reinforcing bar inside the steel pipe is Y-shaped.

[0014] By adopting the above technical solutions, the connection area between the steel reinforcement inside the steel pipe and the mesh beam can be increased, thereby improving the firmness and stability of the connection. When the grouting micro steel pipe pile is subjected to external force, the top of the Y-shaped steel reinforcement can better disperse and bear the force, preventing the connection between the steel reinforcement and the mesh beam from loosening or breaking, and further enhancing the overall strength and durability of the slope protection structure.

[0015] The present invention is further configured such that the plurality of grouting micro steel pipe piles are arranged in two groups, and the plurality of grouting micro steel pipe piles in each group are arranged at equal intervals along the length direction of the high slope, and the grouting micro steel pipe piles in the two groups are arranged alternately.

[0016] By adopting the above technical solution, the staggered arrangement of grouting micro steel pipe piles enables adjacent piles to better support each other, forming a more compact and solid slope protection system. When the high slope is subjected to external forces such as soil pressure and rainwater erosion, the staggered arrangement of grouting micro steel pipe piles can more effectively disperse and bear these forces, preventing the slope protection structure from deforming or collapsing, thereby ensuring the safety and stability of the high slope in the excavation area.

[0017] The present invention is further configured such that: the mesh beam includes a transverse reinforcing cage disposed on the reinforcing bars in each group of steel pipes, an oblique reinforcing cage disposed on the reinforcing bars in two adjacent steel pipes in the two groups, and a cement beam body that wraps the transverse reinforcing cages and the transverse reinforcing cages, and the grouting steel pipe and PVC grouting pipe are inserted and fixed on the cement beam body.

[0018] By adopting the above technical solutions, the installation of transverse and diagonal reinforcing cages enables the mesh beam to better distribute and bear external forces, preventing breakage or deformation. Simultaneously, the cement beam enclosure not only increases the durability of the mesh beam but also allows for more secure fixation of the grouting steel pipes and PVC grouting pipes, avoiding grout leakage during the grouting process and improving the grouting effect. This design not only optimizes the overall performance of the high slope protection structure but also ensures the smooth progress of construction, providing a strong guarantee for the safety and stability of high slopes in excavation areas.

[0019] In summary, the beneficial technical effects of this utility model are as follows: before excavation, grouting micro steel pipe piles are used for support, and a support system composed of graded crushed stone cushion layer and mesh tie beam is used to ensure the safety of irrigation canals and other engineering structures at the top of the slope. Then, a retaining wall and anchored retaining wall are added to form a stepped slope, which has the advantages of structural stability and convenient construction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the slope protection structure of this utility model.

[0021] Figure 2 This is a structural schematic diagram of the steel pipe pile unit of this utility model.

[0022] Figure 3 This is a structural schematic diagram of the grouting micro steel pipe pile of this utility model.

[0023] Figure 4 This is a schematic diagram showing the connection relationship between the grouting micro steel pipe and the mesh beam of this utility model.

[0024] In the diagram, 1. Steel pipe pile unit; 11. Graded crushed stone cushion layer; 111. Grouting hole; 12. Mesh tie beam; 121. Transverse reinforcing cage; 122. Inclined reinforcing cage; 123. Cement beam; 13. Grouting micro steel pipe pile; 131. Reinforcing steel bracket; 132. Grouting steel pipe; 133. Positioning reinforcing steel; 134. PVC grouting pipe; 135. Reinforcing steel inside the steel pipe; 136. Cement mortar pile; 2. Retaining wall; 3. Anchored retaining wall. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figure 1 This utility model discloses a high slope protection structure for an excavated area, comprising, from top to bottom, a steel pipe pile unit 1, a retaining wall 2, and an anchored retaining wall 3. (See reference...) Figure 2 The steel pipe pile unit 1 includes a graded crushed stone cushion layer 11 laid on the top of the high slope, a mesh tie beam 12 set on the graded crushed stone cushion layer 11, and multiple grouting micro steel pipe piles 13 passing through the graded crushed stone cushion layer 11. The top of the grouting micro steel pipe pile 13 is set on the mesh node of the mesh tie beam 12, and the bottom end is inserted and fixed in the high slope. The facing wall 2 and the anchored retaining wall 3 are respectively arranged relative to the slope surface of the high slope and form a stepped surface.

[0027] During excavation operations, high slopes can first be supported by grouting micro steel pipe piles 13. Grouting micro steel pipe piles 13 have high bearing capacity and deformation resistance, which can effectively improve the stability of high slopes, ensure the safety of irrigation canals and other engineering structures, and prevent safety accidents such as slope collapse. At the same time, the setting of graded crushed stone cushion layer 11 and mesh tie beam 12 can further enhance the integrity and stability of the slope protection structure. During construction, the formation of stepped slopes not only facilitates construction operations but also further improves the stability of the slope. The setting of retaining wall 2 and anchored retaining wall 3 can further protect the slope and prevent soil erosion and landslides. In addition, this slope protection structure has the advantages of convenient construction and low cost, and is suitable for high slope support projects in various excavation areas.

[0028] Reference Figure 2 and Figure 3 Multiple grouting holes 111 are drilled on the graded crushed stone cushion layer 11 and the high slope. The grouting micro steel pipe pile 13 includes a steel reinforcement bracket 131 arranged at the bottom of the grouting hole 111, a grouting steel pipe 132 set on the steel reinforcement bracket 131, multiple positioning steel bars 133 evenly distributed on the periphery of the grouting steel pipe 132 and abutting against the inner wall of the grouting hole 111, PVC grouting pipes 134 and steel pipe reinforcement 135 inserted intermittently on the grouting steel pipe 132, and cement mortar piles 136 filled in the grouting hole 111. Among them, the top of the steel pipe reinforcement 135 is Y-shaped, and the tops of the grouting steel pipe 132, PVC grouting pipe 134 and steel pipe reinforcement 135 extend to the outside of the grouting hole 111 and are inserted and fixed to the mesh tie beam 12.

[0029] The structural design of the grouting micro steel pipe pile 13 can further enhance the connection strength between the grouting micro steel pipe pile 13 and the graded crushed stone cushion layer 11 and the high slope, and improve the stability and bearing capacity of the entire slope protection structure. The setting of the steel reinforcement bracket 131 can ensure the stable support of the grouting steel pipe 132 at the bottom of the grouting hole 111. The grouting steel pipe 132 and the PVC grouting pipe 134 can ensure that the grouting material is evenly injected into the grouting hole 111 to form a complete cement mortar pile 136. In addition, by extending the top of the grouting steel pipe 132, the PVC grouting pipe 134 and the steel reinforcement 135 inside the steel pipe to the outside of the grouting hole 111 and inserting and fixing them to the mesh tie beam 12, a reliable connection between the grouting micro steel pipe pile 13 and the mesh tie beam 12 can be achieved, further enhancing the integrity and stability of the slope protection structure. The positioning reinforcement 133 ensures the accurate positioning of the grouting micro-steel pipe pile 13 within the grouting hole 111, preventing the grouting steel pipe 132 from shifting or tilting during grouting. This ensures that the grouting material can evenly and fully fill the entire grouting hole 111, forming a denser and more stable cement mortar pile 136. When the grouting micro-steel pipe pile 13 is subjected to external forces, the Y-shaped reinforcement tip can better distribute and bear the force, preventing the connection between the reinforcement and the mesh beam 12 from loosening or breaking, further enhancing the overall strength and durability of the slope protection structure.

[0030] Reference Figure 4 Multiple grouting micro-steel pipe piles 13 are arranged in two groups. In each group, the grouting micro-steel pipe piles 13 are arranged at equal intervals along the length of the high slope, and the piles 13 in the two groups are arranged in an alternating pattern. This alternating arrangement of the grouting micro-steel pipe piles 13 allows adjacent piles to better support each other, forming a more compact and robust slope protection system. When the high slope is subjected to external forces such as soil pressure and rainwater erosion, the alternating arrangement of the grouting micro-steel pipe piles 13 can more effectively disperse and bear these forces, preventing deformation or collapse of the slope protection structure, thereby ensuring the safety and stability of the high slope in the excavation area.

[0031] The mesh beam 12 includes a transverse reinforcing cage 121 set on the reinforcing bars 135 in each group of steel pipes, an inclined reinforcing cage 122 set on the reinforcing bars 135 in two adjacent steel pipes in the two groups, and a cement beam body 123 that wraps the transverse reinforcing cage 121 and the transverse reinforcing cage 121. The grouting steel pipe 132 and the PVC grouting pipe 134 are inserted and fixed on the cement beam body 123. The installation of the transverse reinforcing cage 121 and the inclined reinforcing cage 122 enables the mesh beam 12 to better distribute and bear the force when subjected to external forces, preventing the mesh beam 12 from breaking or deforming. At the same time, the encapsulation of the cement beam body 123 not only increases the durability of the mesh beam 12, but also allows the grouting steel pipe 132 and PVC grouting pipe 134 to be more firmly fixed to it, avoiding grout leakage during the grouting process and improving the grouting effect. This design not only optimizes the overall performance of the high slope protection structure, but also ensures the smooth progress of the construction process, providing a strong guarantee for the safety and stability of the high slope in the excavation area.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A slope protection structure for high slopes in excavation areas, characterized in that: The structure includes a steel pipe pile unit (1), a retaining wall (2), and an anchored retaining wall (3) arranged sequentially from top to bottom. The steel pipe pile unit (1) includes a graded crushed stone cushion layer (11) laid on the top of the high slope, a mesh tie beam (12) set on the graded crushed stone cushion layer (11), and multiple grouting micro steel pipe piles (13) passing through the graded crushed stone cushion layer (11). The top of the grouting micro steel pipe pile (13) is set on the mesh node of the mesh tie beam (12), and the bottom is inserted and fixed in the high slope. The retaining wall (2) and the anchored retaining wall (3) are arranged relative to the slope surface of the high slope and form a stepped surface.

2. The slope protection structure for a high slope in an excavation area according to claim 1, characterized in that: Multiple grouting holes (111) are provided on the graded crushed stone cushion layer (11) and the high slope. The grouting micro steel pipe pile (13) includes a steel reinforcement bracket (131) arranged at the bottom of the grouting hole (111), a grouting steel pipe (132) set on the steel reinforcement bracket (131), a PVC grouting pipe (134) and a steel reinforcement (135) inserted into the grouting steel pipe (132) with gaps, and a cement mortar pile (136) filled in the grouting hole (111). The top ends of the grouting steel pipe (132), the PVC grouting pipe (134) and the steel reinforcement (135) extend to the outside of the grouting hole (111) and are inserted and fixed to the mesh tie beam (12).

3. The slope protection structure for high slopes in excavation areas according to claim 2, characterized in that: The grouting micro steel pipe pile (13) also includes a plurality of positioning steel bars (133) evenly distributed on the periphery of the grouting steel pipe (132) and abutting against the inner wall of the grouting hole (111).

4. The slope protection structure for a high slope in an excavation area according to claim 2, characterized in that: The top of the steel bar (135) inside the steel pipe is Y-shaped.

5. A high slope protection structure for excavated areas according to claim 2, characterized in that: The plurality of grouting micro steel pipe piles (13) are arranged in two groups, and the plurality of grouting micro steel pipe piles (13) in each group are arranged at equal intervals along the length direction of the high slope, and the grouting micro steel pipe piles (13) in the two groups are arranged alternately.

6. A high slope protection structure for excavated areas according to claim 5, characterized in that: The mesh beam (12) includes a transverse reinforcing cage (121) set on the reinforcing bars (135) in each group of steel pipes, an oblique reinforcing cage (122) set on the reinforcing bars (135) in two adjacent steel pipes in the two groups, and a cement beam body (123) that wraps the transverse reinforcing cage (121) and the transverse reinforcing cage (121). The grouting steel pipe (132) and the PVC grouting pipe (134) are inserted and fixed on the cement beam body (123).

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