Dual energy dissipation drainage ditch

Abstract

A dual-energy-dissipation drainage ditch belongs to the technical field of drainage ditches. The ditch comprises a gradient permeation energy dissipation unit and a spiral flow channel energy dissipation unit, the gradient permeation energy dissipation unit is the ditch bottom of the ditch, a graded broken stone layer, a basalt fiber net layer and a pervious concrete layer are sequentially laid from bottom to top, and the porosity of the pervious concrete layer is gradually decreased from 25% to 15% according to the gradient in the water flow direction; the graded broken stone layer is uniformly paved parallel to the ditch bottom; the basalt fiber net layer is flatly laid on the graded broken stone layer, meshes of the basalt fiber net layer are of a hexagonal honeycomb structure, each spiral flow channel energy dissipation unit comprises a ditch wall and spiral ribs arranged on the inner side of the ditch wall, and the number of the spiral ribs on each side is 2-3 rows. The energy dissipation efficiency, the anti-scouring performance, the sediment control performance and the long-term stability of the structure exceed those of a traditional technology, and an efficient and reliable solution is provided for high slope drainage engineering.

Description

Technical Field

[0001] This utility model belongs to the field of drainage ditch technology, specifically relating to a dual energy dissipation drainage ditch. Background Technology

[0002] In complex terrains such as deep foundation pits and high slopes, traditional drainage ditches often employ stepped or baffle-type energy dissipation structures. However, such designs have significant drawbacks: First, stepped energy dissipation is prone to localized erosion damage due to concentrated water flow impact on steep slopes or under extreme flow conditions, and the gaps between the steps are often clogged by silt accumulation, weakening the energy dissipation effect. Second, while baffle-type energy dissipation can disperse water flow, its rigid structure is prone to fatigue cracking under repeated impacts from high-speed water flow, and the fixed baffle spacing makes it difficult to adapt to flow fluctuations, resulting in high maintenance costs. Furthermore, existing technologies mostly focus on a single energy dissipation method, lacking a coordinated design for silt filtration and energy dissipation, leading to clogging of the permeable layer and failure of the reverse filtration function during long-term operation of the drainage ditch, thus exacerbating structural damage. Utility Model Content

[0003] This utility model proposes a dual energy dissipation drainage ditch, which aims to solve the problem that traditional stepped and baffle-type energy dissipation methods are difficult to adapt to extreme water flow on high slopes, thereby improving energy dissipation efficiency and long-term structural stability.

[0004] A dual energy dissipation drainage ditch is characterized by comprising a gradient infiltration energy dissipation unit and a spiral flow channel energy dissipation unit. The gradient infiltration energy dissipation unit is the bottom of the ditch, which is laid from bottom to top with a layer of graded crushed stone, a layer of basalt fiber mesh, and a layer of permeable concrete. The porosity of the permeable concrete layer decreases from 25% to 15% along the water flow direction. The graded crushed stone layer is 100-150mm thick, with crushed stone particles of 10-30mm in diameter, and is laid evenly parallel to the bottom of the ditch. The basalt fiber mesh layer is 50-100mm thick, laid flat on top of the graded crushed stone layer, and has a hexagonal honeycomb structure with a mesh size of 5-8mm. The permeable concrete layer is 100-150mm thick, with a concrete porosity of 15%-25% and a water-cement ratio of 0.28-0.30. The spiral flow channel energy dissipation unit includes a ditch wall and spiral ribs set on the inner side of the ditch wall, with 2-3 rows of spiral ribs on each side.

[0005] Furthermore, the spiral ribs are constructed by erecting formwork and pouring concrete simultaneously with the trench wall construction. The bottom width L of the spiral ribs is 50-80mm, the spacing S between adjacent ribs is 100-150mm, and the rib height D is 1 / 6-1 / 4 of the trench depth.

[0006] The beneficial effects of this invention are as follows: The gradient infiltration energy dissipation unit adopts a three-layer gradient porous material to achieve gradual deceleration of water flow and stratified interception of sediment. The graded crushed stone layer provides efficient reverse filtration, while the basalt fiber mesh, with its hexagonal honeycomb structure and tensile strength of not less than 120 MPa, enhances erosion resistance and prevents base deformation. The gradient porosity of the permeable concrete layer optimizes the flow velocity distribution, avoids local sediment accumulation, and significantly improves the long-term stability of the infiltration system. The spiral flow channel energy dissipation unit converts the linear kinetic energy of the water flow into rotational dissipation energy by inducing secondary eddy current disturbance. The rib height and spacing are dynamically designed based on the trench depth, which can adapt to different slopes and flow conditions, effectively mitigating the concentrated scouring of the trench wall by high-speed water flow. The dual energy dissipation mechanism of gradient infiltration and spiral flow channel forms a three-dimensional energy dissipation network. The permeable layer at the bottom of the trench reduces the longitudinal flow velocity and filters sediment, while the spiral ribs on the trench wall disrupt the straight-line movement of the transverse water flow. The synergistic effect of these two elements increases the energy dissipation efficiency by more than 40%, and the overall erosion resistance of the structure is significantly enhanced, especially under heavy rain or high flow conditions. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a dual energy dissipation drainage ditch.

[0008] Figure 2 This is a front view of a dual energy-dissipating drainage ditch.

[0009] Figure 3 This is a schematic diagram of the inner side of the trench wall.

[0010] Wherein: 1-gradient infiltration energy dissipation unit, 2-spiral flow channel energy dissipation unit, 3-permeable concrete layer, 4-basalt fiber mesh layer, 5-graded crushed stone layer, 6-spiral ribs. Detailed Implementation

[0011] Example 1: A dual energy dissipation drainage ditch includes a gradient infiltration energy dissipation unit 1 and a spiral flow channel energy dissipation unit 2. The gradient infiltration energy dissipation unit 1 forms the bottom of the ditch, and from bottom to top, it is laid with a graded crushed stone layer 5, a basalt fiber mesh layer 4, and a permeable concrete layer 3. The porosity of the permeable concrete layer 3 decreases from 25% to 15% along the water flow direction. The graded crushed stone layer 5 is 100-150mm thick, with crushed stone particles of 10-30mm in diameter, and is laid evenly parallel to the bottom of the ditch. The basalt fiber mesh layer 4 is 50-100mm thick, laid flat on top of the graded crushed stone layer 5, and has a hexagonal honeycomb structure with a mesh size of 5-8mm. The permeable concrete layer 3 is 100-150mm thick, with a concrete porosity of 15%-25% and a water-cement ratio of 0.28-0.30. The spiral flow channel energy dissipation unit 2 includes a trench wall and spiral ribs 6 set on the inner side of the trench wall. There are two rows of spiral ribs 6 on each side. The spiral ribs 6 are poured at the same time as the trench wall when the formwork is erected. The bottom width L of the spiral ribs 6 is 50-80mm, the spacing S between adjacent ribs is 100-150mm, and the rib height D is 1 / 6-1 / 4 of the trench depth.

[0012] The gradient infiltration energy dissipation unit 1 reduces the flow velocity through stepwise infiltration and can also filter sediment; the spiral ribs 6 of the spiral flow channel energy dissipation unit 2 can effectively improve energy dissipation efficiency and long-term structural stability by disrupting the linear kinetic energy of the water flow through secondary eddy current disturbance.

Claims

1. A dual energy dissipating channel, characterized in that The gradient permeation energy dissipation unit is the ditch bottom of the water ditch, and a graded gravel layer, a basalt fiber mesh layer and a pervious concrete layer are sequentially laid from bottom to top, wherein the porosity of the pervious concrete layer decreases from 25% to 15% along the water flow direction; the thickness of the graded gravel layer is 100-150 mm, the laid gravel has a particle size of 10-30 mm and is evenly laid parallel to the ditch bottom; the thickness of the basalt fiber mesh layer is 50-100 mm, and the mesh hole is a hexagonal honeycomb structure with a mesh size of 5-8 mm; the thickness of the pervious concrete layer is 100-150 mm, the porosity of the concrete is 15%-25%, and the water-cement ratio is 0.28-0.30; the spiral flow channel energy dissipation unit comprises a ditch wall and spiral ribs arranged on the inner side of the ditch wall, and the number of spiral ribs arranged on each side is 2-3 rows.

2. A dual energy dissipating channel as claimed in claim 1, wherein The spiral ribs and the ditch wall are cast simultaneously when the formwork is erected, the bottom width L of the spiral rib is 50-80 mm, the distance S between adjacent ribs is 100-150 mm, and the rib height D is 1 / 6-1 / 4 of the ditch depth.

Images