Multi-layer composite impermeable cement blanket erosion trench head protection structure

Abstract

This utility model discloses a multi-layer composite impermeable cement blanket structure for protecting the head of an erosion gully, relating to the field of erosion gully protection technology. It includes a protective blanket laid in the head area of ​​the erosion gully, U-shaped nails for fixing the protective blanket, a water-retaining embankment above the gully head, an energy-dissipating section at the bottom of the gully head, and a backfill layer for limiting the position of the protective blanket. The protective blanket covers the steep slope section of the gully head and extends to both sides and the top of the gully head. The protective blanket is composed of at least two alternating layers of cement-based impermeable layers and fiber-reinforced layers. Multiple U-shaped nails are arranged in an array. This utility model, through the arrangement of the protective blanket, U-shaped nails, steep slope section, water-retaining embankment, backfill layer, and energy-dissipating section, achieves protection of the erosion gully slope soil during use and prevents slope expansion.

Description

Technical Field

[0001] This utility model relates to the field of erosion ditch protection technology, specifically to a erosion ditch head protection structure using a multi-layer composite impermeable cement blanket. Background Technology

[0002] Gullies are gullies formed by the erosion of land by rainwater. When rainwater forms runoff on the surface, it converges in low-lying areas, eroding the soil and forming gullies. This phenomenon can occur in all soil types, but it is particularly evident on the Loess Plateau.

[0003] When water flows from the slope, it flows directly into the erosion gully without being guided in an orderly manner. The resulting water flow will have a continuous and irregular scouring effect on the slope of the erosion gully. This scouring will continuously erode the slope soil, causing the slope outline to be destroyed, soil loss, collapse, deformation and other problems, which will further aggravate the expansion of the erosion gully and affect the soil and water conservation and the overall ecological environment of the surrounding area. To address this, a multi-layer composite impermeable cement blanket erosion gully head protection structure is proposed. Utility Model Content

[0004] The purpose of this utility model is to address the problem that water flow exerts a continuous and irregular scouring effect on the slope of erosion gullies. This scouring continuously erodes the slope soil, leading to damage to the slope outline, soil loss, collapse, deformation, and other problems, which in turn exacerbate the expansion of erosion gullies and affect soil and water conservation and the overall ecological environment of the surrounding area. This utility model provides a multi-layer composite impermeable cement blanket structure for the protection of the head of erosion gullies.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] The multi-layer composite impermeable cement blanket erosion ditch head protection structure includes a protective blanket laid in the erosion ditch head area, U-shaped nails for fixing the protective blanket, a water-blocking embankment set above the ditch head, an energy dissipation section located at the bottom of the ditch head, and a backfill layer for limiting the position of the protective blanket. The protective blanket covers the steep slope section of the ditch head and extends to both sides and the top of the ditch head.

[0007] Furthermore, the protective blanket is composed of at least two alternating layers of cement-based impermeable layer and fiber-reinforced layer.

[0008] Furthermore, there are multiple U-shaped nails, and the U-shaped nails are distributed in an array.

[0009] Furthermore, the water-retaining embankment has a trapezoidal cross-section structure.

[0010] Furthermore, the connection points between the energy dissipation section, the water-blocking embankment, and the steep slope section adopt a rounded transition.

[0011] Furthermore, the bottom of the protective blanket is also provided with a seepage-proof layer.

[0012] The beneficial effects of this utility model are as follows:

[0013] This utility model, through the setting of protective blankets, U-shaped nails, steep slope sections, water-blocking embankments, backfill layers, and energy dissipation sections, achieves protection of the soil on the slope of the erosion gully during use and avoids the expansion of the slope soil. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a main sectional view of the present invention;

[0016] Figure 3 This is a utility model Figure 2 Enlarged view of section A in the middle;

[0017] Attached diagram labels: 1. Protective blanket; 2. U-shaped nail; 3. Steep slope section; 4. Water barrier; 5. Backfill layer; 6. Energy dissipation section. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present 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 present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1 to 3 As shown, the multi-layer composite impermeable cement blanket gully head protection structure includes a protective blanket 1 laid in the gully head area, U-shaped nails 2 for fixing the protective blanket 1, a water-retaining embankment 4 set above the gully head, an energy dissipation section 6 located at the bottom of the gully head, and a backfill layer 5 for limiting the position of the protective blanket 1. The protective blanket 1 covers the steep slope section 3 of the gully head and extends to both sides and the top of the gully head. Specifically, in response to the disorderly erosion of the gully slope caused by the drainage of water from the slope, a scheme is adopted in which the water-retaining embankment 4 is constructed in conjunction with a small drop structure of cement blanket during use. First, a trapezoidal soil drop outlet is formed by manual excavation at the obvious drop location. At the same time, the gully slope is trimmed to create a concave drainage channel. A connecting trench is excavated at a position of 1-1.5m inside the drop outlet. During the excavation and shaping... Layered compaction is required, with the compaction standard being no less than 0.5-0.9 for cohesive soil and no less than 0.3-0.9 for non-cohesive soil, ensuring a stable foundation. Subsequently, the protective blanket 1 is tightly fixed inside the erosion gully using U-shaped nails 2, burying the protective blanket 1 in the bonding trench and fully covering the steep slope section 3 at the gully head, while extending to both sides and the top, forming a complete protective barrier that directly blocks the water flow from eroding the soil at the gully head. Then, the water flow is guided to flow directionally along the concave drainage channel through the steep slope section 3, which, together with the energy dissipation section 6, weakens the kinetic energy of the water flow and reduces the impact force of the water flow on the protective blanket 1, thereby extending the service life of the protective blanket 1. The backfill layer 5 is compacted and wraps around the edge of the protective blanket 1 to further restrict its displacement, ensuring that the protective blanket 1 maintains a stable protective state under the long-term action of water flow.

[0023] like Figures 1 to 3As shown in the figure, the protective blanket 1 is composed of at least two layers of cement-based impermeable layers and fiber-reinforced layers alternately laminated. Specifically, during use, the protective blanket 1 forms a high-strength coverage of the erosion ditch through the structure of at least two layers of cement-based impermeable layers and fiber-reinforced layers alternately laminated. Its specifications need to meet: thickness 1 - 5 cm, core material bulk density ≥ 1.7 g / cm³, core material water absorption rate ≤ 16%, core material compressive strength ≥ 40 MPa, core material flexural ultimate strength ≥ 12 MPa, core material impact strength ≥ 6 kJ / m². Among them, the cement-based impermeable layer can effectively block the penetration of water flow and prevent water from directly contacting the soil at the gully head. The fiber-reinforced layer enhances the overall toughness, improves the tear resistance and deformation resistance of the protective blanket 1, and adapts to the slight settlement or change of the gully head terrain, so as to stably block the contact between water and soil during long-term use and strengthen the protection effect.

[0024] As Figures 1 to 3 shown in the figure, there are multiple U-shaped nails 2, and the U-shaped nails 2 are arranged in an array. Specifically, during use, the multiple U-shaped nails 2 arranged in an array can evenly transfer the fixing force to the protective blanket 1 and the lower soil body, avoiding warping, displacement or tearing of the protective blanket 1 caused by local stress concentration. The U-shaped nails 2 are made of ∅8 threaded steel and are longitudinally fixed at seven places on the upper part of the protective blanket 1, with a total of two rows and a spacing of 1.5 - 2 m. At the same time, the overlapping width of the protective blanket 1 is 200 - 300 mm, following the principle that the upstream overlaps on the downstream cement blanket. The overlapping part needs to be fixed with U-shaped nails 2. Especially in the steep slope section 3 and the energy dissipation section 6 with strong water flow impact, the array-distributed U-shaped nails 2 can form multi-point stable supports, ensuring that the protective blanket 1 always adheres to the gully head surface during the water flow guiding process and maintaining a complete protection form.

[0025] As Figures 1 to 3 shown in the figure, the water retaining ridge 4 has a trapezoidal cross-section structure. Specifically, during use, the trapezoidal cross-section water retaining ridge 4 has a stable structure and strong impact resistance. As a key structure supporting the small-scale drop of the cement blanket, it can effectively collect the scattered slope water above the gully head, introduce the surrounding rainwater to the drop position through a preset path, prevent the water flow from overflowing to the unprotected side slopes of the gully head. At the same time, its trapezoidal design can guide the outside water flow to smoothly flow into the ditch along the preset path, avoiding the formation of turbulent flow erosion due to the disordered path of the water flow, ensuring that the water can stably flow to the energy dissipation section 6 and the steep slope section 3, and reducing the damage to the gully head caused by disordered erosion.

[0026] As Figures 1 to 3As shown, the connection between the energy dissipation section 6, the water-blocking embankment 4, and the steep slope section 3 adopts a rounded transition. Specifically, during use, the connection between the energy dissipation section 6, the water-blocking embankment 4, and the steep slope section 3 adopts a rounded transition, which can avoid the formation of turbulence or local high pressure at the turning point of the water flow, and reduce the local impact on the protective blanket 1. The three work together to guide the water flow in a directional manner, while the rounded transition makes the water flow smoothly connected. The energy dissipation section 6 further weakens the kinetic energy of the water flow, and the steep slope section 3 guides the water flow to flow down in an orderly manner along the concave drainage channel, which significantly reduces the impact force of the water on the protective blanket 1, thereby extending the service life of the protective blanket 1.

[0027] like Figures 1 to 3 As shown, the bottom of the protective blanket 1 is also provided with an impermeable layer. Specifically, during use, the impermeable layer at the bottom of the protective blanket 1 can form a synergistic impermeable system with the protective blanket 1, effectively blocking the water flow at the top of the protective blanket 1 from seeping downwards along the gap between it and the soil, preventing the seepage water from washing away the soil at the bottom of the protective blanket 1 and causing soil loss, thereby preventing the protective blanket 1 from collapsing or deforming due to loss of bottom support, and ensuring its structural stability and protective effect during long-term use.

[0028] like Figures 1 to 3 As shown, the working state of the erosion ditch head protection structure of this multi-layer composite impermeable cement blanket is as follows: The protection structure is achieved by using a water-retaining embankment 4 in conjunction with a small drop structure made of cement blanket. First, a trapezoidal drop structure is formed by manual excavation, and a concave drainage channel is prepared. The layers are compacted, with the compaction degree of cohesive soil ≥0.9 and the relative density of non-cohesive soil ≥0.6 to ensure the stability of the foundation. Then, the multi-layer composite cement blanket that meets the specifications is buried in the bonding trench 1-1.5m inside the drop structure and is lowered to the bottom of the ditch along the slope. It is secured by U-shaped nails made of ∅8 threaded steel. 2. The structure is tightly fixed, and the trapezoidal cross-section water-retaining embankment 4 is used to collect the surrounding rainwater and introduce it into the drop position to prevent overflow. The water flow is guided through the water-retaining embankment 4 to the energy dissipation section 6. It works with the steep slope section 3 through the arc transition to weaken the kinetic energy of the water flow and guide the water flow to flow downward in a stable direction, reducing the impact on the cement blanket. The backfill layer 5 is compacted and wraps the edge of the cement blanket to restrict displacement. The bottom seepage prevention layer and the cement blanket form a synergistic seepage prevention system to prevent seepage water from eroding the bottom soil. Finally, through the synergistic effect of each structure, the disorderly erosion of the slope of the erosion gully by the water flow is blocked, ensuring the stability of the gully head.

[0029] In summary, this utility model includes a protective blanket 1 laid in the head area of ​​an erosion gully, U-shaped nails 2 for fixing the protective blanket 1, a water-retaining embankment 4 set above the gully head, an energy-dissipating section 6 located between the water-retaining embankment 4 and the steep slope of the gully head, and a backfill layer 5 for limiting the position of the protective blanket 1. The protective blanket 1 covers the steep slope section 3 of the gully head and extends to both sides and the top of the gully head. Through the arrangement of the protective blanket 1, U-shaped nails 2, steep slope section 3, water-retaining embankment 4, backfill layer 5, and energy-dissipating section 6, this utility model achieves protection of the erosion gully slope soil during use and prevents slope soil expansion.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An erosion gully head protection structure of a multi-layer composite impermeable cement blanket, characterized in that, It includes a protective blanket laid in the head area of ​​the erosion gully, U-shaped nails for fixing the protective blanket, a water-blocking embankment set above the gully head, an energy dissipation section located at the bottom of the gully head, and a backfill layer for limiting the position of the protective blanket. The protective blanket covers the steep slope section of the gully head and extends to both sides and the top of the gully head.

2. The multi-layer composite impermeable blanket of cement erosion gully head protection structure according to claim 1, characterized in that, The protective blanket is composed of at least two alternating layers of cement-based impermeable layer and fiber-reinforced layer.

3. The multi-layer composite blanket of erosion gully head protection structure according to claim 1, wherein, There are multiple U-shaped nails, and the U-shaped nails are distributed in an array.

4. The multi-layer composite blanket of erosion gully head protection structure according to claim 1, wherein, The water-blocking embankment has a trapezoidal cross-section structure.

5. The multi-layer composite blanket of erosion gully head protection structure according to claim 1, wherein, The connection points between the energy dissipation section, the water-blocking embankment, and the steep slope section are made using rounded transitions.

6. The multi-layer composite blanket of the erosion gully head protection structure according to claim 1, wherein, The bottom of the protective blanket is also equipped with a seepage-proof layer.

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