Foot protection structure for urban U-shaped river channel

Abstract

The utility model discloses a foot protection structure for an urban U-shaped river channel, which comprises a box body, a plurality of pile bodies are fixedly connected with the box body, each pile body is positioned under the box body, a concrete layer, a block stone layer and a planting soil layer are sequentially arranged in the box body from bottom to top, an original retaining wall revetment forms effective protection, and the foot protection structure has an ecological greening effect, is lower in cost and is convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of river channel regulation devices and relates to a foot protection structure used for a U-shaped river channel in an urban area. Background Art

[0002] Most of the rivers in urban areas of my country are U-shaped, usually with upright revetments on both sides. With the development of cities, river siltation is very common. On the one hand, it affects the flow of water in rivers and threatens the safety of people's lives and property. On the other hand, silt is often a source of pollution, affecting the ecological environment of rivers. In order to meet the requirements of urban river flood control and ecological protection, river dredging is a common engineering measure. Since river bank protection structures are often built a long time ago, when the dredging depth is deep, the river bank protection foot will be exposed, affecting the stability and safety of the structure. In the face of the above situation, there are usually two approaches: (1) A certain width of the riverbed at the foot is not dredged, resulting in silt exposure, affecting the river appearance. At the same time, due to the poor anti-scouring ability of the silt at the foot, it is easy to be scourged during floods, resulting in the exposure of the revetment foot, affecting the safety of the embankment; (2) Piling or building a new outsourced foot protection structure at the foot can ensure the stability of the revetment structure to a certain extent, but due to its relatively rigid appearance, it often does not meet the requirements of the urban river appearance. Utility Model Content

[0003] The utility model aims to provide a foot protection structure for urban U-shaped rivers, which solves the problem of bank stability after dredging of urban U-shaped rivers and improves the appearance of urban rivers.

[0004] The technical solution adopted by the utility model is a foot protection structure for urban U-shaped rivers, comprising a box body, a plurality of pile bodies fixedly connected to the box body, each pile body being located directly below the box body, and a concrete layer, a block stone layer and a planting soil layer being sequentially arranged in the box body from bottom to top.

[0005] The utility model is also characterized in that:

[0006] The box body is a trapezoid, and toes are provided at the four corners of the bottom of the box body. The toe height is 0.15m-0.2m, the toe bottom width is 0.1m-0.15m, and the slope foot of the toe is 1:0.5-1:0.75. A cavity through hole is opened perpendicular to the top end face of the box body, and the side walls of the box body are respectively provided with a first square hole, a second square hole and a third rectangular hole. The cavity through hole is connected with the first square hole, the second square hole and the third rectangular hole. The height of the box body is 1m-1.5m, the length of the box body is 1.5m-2m, the top width of the box body is 0.8m-1m, the bottom width is 1m-1.2m, the wall thickness of the box body is 0.1m-0.15m, and the river side slope ratio of the box body is 1:0.2-1:0.3.

[0007] The top boundary of the cavity through hole is 0.1m-0.15m away from the outer boundary of the box, the bottom boundary of the cavity through hole is 0.2m-0.25m away from the outer boundary of the box, the lower boundary of the first square hole and the lower boundary of the second square hole are 0.3m-0.35m away from the outer boundary of the box, the upper boundary of the first square hole and the upper boundary of the second square hole are 0.4m-0.6m away from the outer boundary of the box, the two side boundaries of the first square hole and the two side boundaries of the second square hole are 0.1m-0.15m away from the outer boundary of the box, the upper boundary of the third rectangular hole and the lower boundary of the third rectangular hole are at the same elevation as the upper boundary of the first square hole and the lower boundary of the first square hole, and the two side boundaries of the third rectangular hole are 0.2m-0.25m away from the outer boundary of the box.

[0008] The length of each pile is 4m-8m, and each pile is densely arranged along the direction of river flow.

[0009] The pile body comprises a constant diameter pile body and a variable diameter pile body. The constant diameter pile body is arranged below the side wall of the box body, and the variable diameter pile body is fixedly connected to the concrete layer inside the box body.

[0010] The diameter of the constant diameter pile body is 0.1m-0.2m, and the variable diameter pile body includes a main support column and a variable diameter support column. The variable diameter support column is fixedly connected to the top of the main support column. The diameter of the variable diameter support column is 0.05m-0.12m, and the diameter of the main support column 20201 is 0.1m-0.2m. A transverse reserved through hole is opened on the side wall of the variable diameter support column. The aperture of the transverse reserved through hole is 0.01m-0.02m, and the transverse reserved through hole is inserted with a pin.

[0011] The stone layer inside the box is wrapped with gabion net, and geotextile is laid between the stone layer and the planting soil layer. The geotextile is also laid between the planting soil layer and the contact surface between the inner wall of the box. The height of the concrete layer is 0.3m-0.35m, the height of the stone layer is 0.3m-0.55m, and the height of the planting soil layer is 0.4m-0.6m.

[0012] The particle size of the block layer is 0.1m-0.3m, and the unit area mass of the geotextile is 250g / m 2 -350g / m 2 .

[0013] The beneficial effects of the utility model are: (1) the utility model effectively protects the original retaining wall bank after dredging the urban U-shaped river channel, and has a certain ecological greening effect;

[0014] (2) The utility model has a simple structure, low cost and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a cross-sectional view in the vertical direction of the river channel of the foot protection structure of the utility model used for the urban U-shaped river channel;

[0016] Figure 2 It is a cross-sectional view parallel to the river channel direction of the foot protection structure of the utility model used for the urban U-shaped river channel;

[0017] Figure 3 It is a structural schematic diagram of the foot protection structure of the utility model used for urban U-shaped river channels;

[0018] Figure 4 The utility model is a schematic diagram of a variable diameter pile structure in a foot protection structure for a U-shaped river channel in an urban area.

[0019] In the figure, 1. box body, 2. pile body, 3. concrete layer, 4. stone layer, 5. planting soil layer, 6. pins, 7. gabion net, 8. geotextile, 9. toe, 10. cavity through hole, 11. first square hole, 12. second square hole, 13. third square hole, 14. horizontal reserved through hole;

[0020] 201. Equal diameter pile, 202. Variable diameter pile;

[0021] 20201. Main support column, 20202. Variable diameter support column. DETAILED DESCRIPTION

[0022] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0023] The utility model is used for the foot protection structure of a U-shaped river in an urban area, such as Figure 1-4As shown, it includes a box body 1, and the box body 1 is fixed with a plurality of pile bodies 2, each pile body 2 is located directly below the box body 1, and the box body 1 is set close to the U-shaped river bank protection. If the river bank protection has an inclination angle, resulting in a gap between the box body 1 and the river bank protection, when pouring plain concrete at the bottom of the box body 1, the gap between the box body 1 and the river bank protection is filled with concrete at the same time, and a planting soil layer 5, a block stone layer 4 and a concrete layer 3 are arranged in the box body 1 from top to bottom, and the block stone layer 4 is wrapped by a gabion net 7. A geotextile 8 is laid between the block stone layer 4 and the planting soil layer 5, and the geotextile 8 is also laid between the planting soil layer 5 and the contact surface of the inner wall of the box body 1. Plants are planted on the top of the planting soil layer 5, and the pile bodies 2 are densely inserted into the foundation. The densely arranged pile bodies 2 are connected by pins 6. When the concrete layer 3 inside the box body 1 is poured, the pile bodies 2 and the box body 1 are formed into a whole, and the box 1 is Trapezoidal body, the box 1 is also provided with toes 9 at the four corners of the bottom, the height of the toes 9 is 0.15m-0.2m, the width of the bottom of the toes 9 is 0.1m-0.15m, the slope foot of the toes 9 is 1:0.5-1:0.75, the height of the box 1 is 1m-1.5m, the length of the box 1 is 1.5m-2m, the top width of the box 1 is 0.8m-1m, and the bottom width of the box 1 is 1m-1. 2m, the wall thickness of the box 1 is 0.1m-0.15m, the riverside slope ratio of the box is 1:0.2-1:0.3, the height of the concrete layer 3 is 0.3m-0.35m, the height of the block stone layer 4 is 0.3m-0.55m, the height of the planting soil layer is 0.4m-0.6m, the block stone particle size of the block stone layer 4 is 0.1m-0.3m, and the unit area mass of the geotextile 8 is 250g / m 2 -350 g / m 2 ;

[0024] The box body 1 is provided with a cavity through hole 10 perpendicular to the top end surface, and the side walls of the box body 1 are respectively provided with a first square hole 11, a second square hole 12 and a third rectangular hole 13, the cavity through hole 10 is connected with the first square hole 11, the second square hole 12 and the third rectangular hole 13, the top boundary of the cavity through hole 10 is 0.1m-0.15m away from the outer boundary of the box body 1, the bottom boundary of the cavity through hole 10 is 0.2m-0.25m away from the outer boundary of the box body 1, the lower boundary of the first square hole 11 and the lower boundary of the second square hole 12 are 0.3m-0.35m away from the outer boundary of the box body 1, and the upper boundary of the first square hole 11 is 0.1m-0.15m away from the outer boundary of the box body 1. The upper boundary of the second square hole 12 is 0.4m-0.6m away from the outer boundary of the box body 1, the side boundaries of the first square hole 11 and the side boundaries of the second square hole 12 are 0.1m-0.15m away from the outer boundary of the box body 1, the upper boundary of the third rectangular hole 13 and the lower boundary of the third rectangular hole 13 are at the same elevation as the upper boundary of the first square hole 11 and the lower boundary of the first square hole 11, the side boundaries of the third rectangular hole 13 are 0.2m-0.25m away from the outer boundary of the box body 1, each pile body 2 is a pine pile or a concrete pile, the length of each pile body 2 is 4m-8m, and each pile body 2 is densely arranged along the direction of river water flow.

[0025] The pile body 2 includes a constant diameter pile body 201 and a variable diameter pile body 202. The constant diameter pile body 201 is arranged below the side wall of the box body 1. The variable diameter pile body 202 is fixedly connected to the concrete layer 3. The diameter of the constant diameter pile body 201 is 0.1m-0.2m. The variable diameter pile body 202 includes a main support column 20201 and a variable diameter support column 20202. The variable diameter support column 20202 is fixedly connected to the top of the main support column 20201. The diameter of the variable diameter support column 20202 is 0.05m-0.12m. A transverse reserved through hole 14 is opened on the side wall of the variable diameter support column 20202. The aperture of the transverse reserved through hole 14 is 0.01m-0.02m. The transverse reserved through hole 14 is inserted with a pin 6.

[0026] The utility model is used for the foot protection structure of the urban U-shaped river channel, and its working process is as follows:

[0027] The box body 1 is cast with concrete. During casting, the box body 1 is pre-set with a cavity through hole 10, a first square hole 11, a second square hole 12 and a third square hole 13. When the pile body 2 is being driven, the position of the pile body 2 needs to match that of the box body 1. A pile body 201 of equal diameter is arranged under the box wall of the box body 1, and a pile body 202 of variable diameter is arranged inside the box body 1. The two types of pile bodies are arranged at intervals. After the pile body 2 is driven, the top of the variable diameter pile body 202 is connected with a pin 6, and then the river channel is dredged. After the dredging is completed to the designed riverbed elevation, the box body 1 and the variable diameter pile body 202 are connected, and then plain concrete is poured to form a concrete layer 3. The top elevation of the concrete layer 3 is the same as the lower boundary of the first square hole 11, the second square hole 12 and the third rectangular hole 13. At the same time, the pouring of the concrete layer 3 forms the box body 1 and the pile body 2 as a whole. When the concrete layer 3 reaches the designed strength, the block stone layer 4 is placed. When placing, in order to prevent the block stone from overflowing from the opening, the block stone is wrapped with a gabion net 7 and then placed. The top elevation of the block stone layer 4 is the same as the upper boundary of the first square hole 11, the second square hole 12 and the third rectangular hole 13. The planting soil is filled from the top of the block stone layer 4 to the top of the box body 1. In order to prevent the loss of the planting soil, a layer of geotextile is laid between the contact surface of the planting soil and the block stone layer 4 and between the planting soil and the inner wall of the box body 1 to fill the planting soil, and finally the plants are planted.

[0028] Example 1

[0029] The foot protection structure for urban U-shaped river channels proposed in this embodiment is as follows: Figure 1-4 As shown, the box body 1 is fixed with a plurality of pile bodies 2, each pile body 2 is located directly below the box body 1, and a concrete layer 3, a block stone layer 4 and a planting soil layer 5 are sequentially arranged in the box body 1 from bottom to top. The box body 1 is a trapezoidal body, and toes 9 are also arranged at the four corners of the bottom of the box body 1. The height of the toe 9 is 0.15m, the width of the bottom of the toe 9 is 0.1m, and the slope foot of the toe 9 is 1:0.5. The box body 1 is provided with a cavity through hole 10 perpendicular to the top end face, and the side walls of the box body 1 are respectively provided with first square holes 11, The second square hole 12 and the third rectangular hole 13, the cavity through hole 10 is connected with the first square hole 11, the second square hole 12 and the third rectangular hole 13, the height of the box body 1 is 1m, the length of the box body 1 is 1.5m, the top width of the box body 1 is 0.8m, the bottom width is 1m, the wall thickness of the box body 1 is 0.1m, the river side slope ratio of the box body 1 is 1:0.2, the material of each pile body 2 is pine pile or concrete pile, the length of each pile body 2 is 4m, and each pile body 2 is densely arranged along the direction of river water flow.

[0030] Example 2

[0031] The foot protection structure for urban U-shaped river channels proposed in this embodiment is as follows: Figure 1-4The box body 1 shown in the figure has several pile bodies 2 fixedly connected to it, each pile body 2 is located directly below the box body 1, and a concrete layer 3, a block stone layer 4 and a planting soil layer 5 are arranged in sequence from bottom to top in the box body 1. The box body 1 is a trapezoidal body, and toes 9 are also arranged at the four corners of the bottom of the box body 1. The height of the toe 9 is 0.18m, the width of the bottom of the toe 9 is 0.13m, and the slope foot of the toe 9 is 1:0.5-1:0.75. A cavity through hole 10 is opened perpendicular to the top end face of the box body 1. The side walls of the box 1 are respectively provided with a first square hole 11, a second square hole 12 and a third rectangular hole 13, the cavity through hole 10 is connected with the first square hole 11, the second square hole 12 and the third rectangular hole 13, the height of the box 1 is 1.3m, the length of the box 1 is 1.8m, the top width of the box 1 is 0.9m, the bottom width is 1.1m, the wall thickness of the box 1 is 0.1m-0.15m, and the slope of the side of the box 1 facing the river is 1:0.5-1:0.7 5. The top boundary of the cavity through hole 10 is 0.13m away from the outer boundary of the box body 1, the bottom boundary of the cavity through hole 10 is 0.23m away from the outer boundary of the box body 1, the lower boundary of the first square hole 11 and the lower boundary of the second square hole 12 are 0.33m away from the outer boundary of the box body 1, the upper boundary of the first square hole 11 and the upper boundary of the second square hole 12 are 0.5m away from the outer boundary of the box body 1, the two side boundaries of the first square hole 11 and the two side boundaries of the second square hole 12 are 0.13m away from the outer boundary of the box body 1, the upper boundary of the third rectangular hole 13 and the lower boundary of the third rectangular hole 13 are at the same elevation as the upper boundary of the first square hole 11 and the lower boundary of the first square hole 11, the two side boundaries of the third rectangular hole 13 are 0.23m away from the outer boundary of the box body 1, each pile body 2 is a pine pile or a concrete pile, each pile body 2 is 6m long, and each pile body 2 is densely arranged along the direction of water flow in the river.

[0032] Example 3

[0033] The foot protection structure for urban U-shaped river channels proposed in this embodiment is as follows: Figure 1-4The box body 1 shown in the figure has a plurality of pile bodies 2 fixedly connected thereto, each pile body 2 being located directly below the box body 1, a concrete layer 3, a block stone layer 4 and a planting soil layer 5 being sequentially arranged in the box body 1 from bottom to top, the box body 1 being a trapezoidal body, toes 9 being also arranged at the four corners of the bottom of the box body 1, the height of the toe 9 being 0.2m, the bottom width of the toe 9 being 0.15m, the slope foot of the toe 9 being 1:0.75, a cavity through hole 10 being opened perpendicular to the top end face of the box body 1, a first square hole 11, a second square hole 12 and a third rectangular hole 13 being opened on the side walls of the box body 1, the cavity through hole 10 being connected to the first square hole 11, the second square hole 12 and the third rectangular hole 13, the height of the box body 1 being 1.5m, and the length of the box body 1 being 2m , the top width of the box 1 is 1m, the bottom width is 1.2m, the wall thickness of the box 1 is 0.15m, the slope of the box 1 is 1:0.75, the top boundary of the cavity through hole 10 is 0.15m away from the outer boundary of the box 1, the bottom boundary of the cavity through hole 10 is 0.25m away from the outer boundary of the box 1, the lower boundary of the first square hole 11 and the lower boundary of the second square hole 12 are 0.35m away from the outer boundary of the box 1, the upper boundary of the first square hole 11 and the upper boundary of the second square hole 12 are 0.6m away from the outer boundary of the box 1, the two side boundaries of the first square hole 11 and the two side boundaries of the second square hole 12 are 0.15m away from the outer boundary of the box 1, and the third side boundary of the third square hole 11 is 0.15m away from the outer boundary of the box 1. The upper boundary of the hole 13 and the lower boundary of the third rectangular hole 13 are at the same elevation as the upper boundary of the first square hole 11 and the lower boundary of the first square hole 11. The distance between the two side boundaries of the third rectangular hole 13 and the outer boundary of the box body 1 is 0.25m. Each pile body 2 is a pine pile or a concrete pile. The length of each pile body 2 is 8m. Each pile body 2 is closely arranged along the direction of water flow in the river. The pile body 2 includes a constant diameter pile body 201 and a variable diameter pile body 202. The constant diameter pile body 201 is arranged below the side wall of the box body 1. The variable diameter pile body 202 is fixedly connected to the concrete layer 3 inside the box body 1. The diameter of the constant diameter pile body 201 is 0.1m. The variable diameter pile body 202 includes a main support column 20201 and a variable diameter support column 20202, the variable diameter support column 20202 is fixedly connected to the top of the main support column 20201, the diameter of the variable diameter support column 20202 is 0.05m, a transverse reserved through hole 14 is opened on the side wall of the variable diameter support column 20202, the aperture of the transverse reserved through hole 14 is 0.01m, and the transverse reserved through hole 14 is plugged with a pin 6, the block stone layer 4 is wrapped with a gabion net 7, and a geotextile 8 is laid between the block stone layer 4 and the planting soil layer 5. The geotextile 8 is also laid between the planting soil layer 5 and the contact surface of the inner wall of the box body 1, the height of the concrete layer 3 is 0.3m, the height of the block stone layer 4 is 0.3m, the height of the planting soil layer is 0.4m, the block stone particle size of the block stone layer 4 is 0.1m, and the unit area mass of the geotextile 8 is 250g / m 2 .

[0034] Example 4

[0035] The foot protection structure for urban U-shaped river channels proposed in this embodiment is as follows: Figure 1-4 The box body 1 shown in the figure has several pile bodies 2 fixedly connected thereto, each pile body 2 being located directly below the box body 1, a concrete layer 3, a block stone layer 4 and a planting soil layer 5 being sequentially arranged in the box body 1 from bottom to top, the box body 1 being a trapezoidal body, toes 9 being also arranged at the four corners of the bottom of the box body 1, the height of the toe 9 being 0.2m, the bottom width of the toe 9 being 0.15m, the slope foot of the toe 9 being 1:0.75, a cavity through hole 10 being opened perpendicular to the top end face of the box body 1, a first square hole 11, a second square hole 12 and a third rectangular hole 13 being opened on the side walls of the box body 1, the cavity through hole 10 being connected to the first square hole 11, the second square hole 12 and the third rectangular hole 13, the height of the box body 1 being 1.5m, and the length of the box body 1 being 2m, The top width of the box body 1 is 1m, the bottom width is 1.2m, the wall thickness of the box body 1 is 0.15m, the slope of the box body 1 is 1:0.75, the top boundary of the cavity through hole 10 is 0.15m away from the outer boundary of the box body 1, the bottom boundary of the cavity through hole 10 is 0.25m away from the outer boundary of the box body 1, the lower boundary of the first square hole 11 and the lower boundary of the second square hole 12 are 0.35m away from the outer boundary of the box body 1, the upper boundary of the first square hole 11 and the upper boundary of the second square hole 12 are 0.6m away from the outer boundary of the box body 1, the two side boundaries of the first square hole 11 and the two side boundaries of the second square hole 12 are 0.15m away from the outer boundary of the box body 1, and the third square hole 1 The upper boundary of the third rectangular hole 13 and the lower boundary of the third rectangular hole 13 are at the same elevation as the upper boundary of the first square hole 11 and the lower boundary of the first square hole 11. The distance between the two side boundaries of the third rectangular hole 13 and the outer boundary of the box body 1 is 0.25m. Each pile body 2 is a pine pile or a concrete pile. The length of each pile body 2 is 8m. Each pile body 2 is closely arranged along the direction of water flow in the river. The pile body 2 includes a constant diameter pile body 201 and a variable diameter pile body 202. The constant diameter pile body 201 is arranged below the side wall of the box body 1. The variable diameter pile body 202 is fixedly connected to the concrete layer 3 inside the box body 1. The diameter of the constant diameter pile body 201 is 0.15m. The variable diameter pile body 202 includes a main support column 20201 and a variable diameter support column 20 202, the variable diameter support column 20202 is fixedly connected to the top of the main support column 20201, the diameter of the variable diameter support column 20202 is 0.09m, a transverse reserved through hole 14 is opened on the side wall of the variable diameter support column 20202, the aperture of the transverse reserved through hole 14 is 0.015m, and the transverse reserved through hole 14 is plugged with a pin 6, the block stone layer 4 is wrapped with a gabion net 7, and a geotextile 8 is laid between the block stone layer 4 and the planting soil layer 5. The geotextile 8 is also laid between the planting soil layer 5 and the contact surface of the inner wall of the box body 1, the height of the concrete layer 3 is 0.33m, the height of the block stone layer 4 is 0.45m, the height of the planting soil layer is 0.5m, the block stone particle size of the block stone layer 4 is 0.2m, and the unit area mass of the geotextile 8 is 300g / m2 .

[0036] Example 5

[0037] The foot protection structure for urban U-shaped river channels proposed in this embodiment is as follows: Figure 1-4The box body 1 shown in the figure has several pile bodies 2 fixedly connected thereto, each pile body 2 being located directly below the box body 1, a concrete layer 3, a block stone layer 4 and a planting soil layer 5 being sequentially arranged in the box body 1 from bottom to top, the box body 1 being a trapezoidal body, toes 9 being also arranged at the four corners of the bottom of the box body 1, the height of the toe 9 being 0.2m, the bottom width of the toe 9 being 0.15m, the slope foot of the toe 9 being 1:0.75, a cavity through hole 10 being opened perpendicular to the top end face of the box body 1, a first square hole 11, a second square hole 12 and a third rectangular hole 13 being opened on the side walls of the box body 1, the cavity through hole 10 being connected to the first square hole 11, the second square hole 12 and the third rectangular hole 13, the height of the box body 1 being 1.5m, and the length of the box body 1 being 2m, The top width of the box body 1 is 1m, the bottom width is 1.2m, the wall thickness of the box body 1 is 0.15m, the slope of the box body 1 is 1:0.75, the top boundary of the cavity through hole 10 is 0.15m away from the outer boundary of the box body 1, the bottom boundary of the cavity through hole 10 is 0.25m away from the outer boundary of the box body 1, the lower boundary of the first square hole 11 and the lower boundary of the second square hole 12 are 0.35m away from the outer boundary of the box body 1, the upper boundary of the first square hole 11 and the upper boundary of the second square hole 12 are 0.6m away from the outer boundary of the box body 1, the two side boundaries of the first square hole 11 and the two side boundaries of the second square hole 12 are 0.15m away from the outer boundary of the box body 1, and the third square hole The upper boundary of 13 and the lower boundary of the third rectangular hole 13 are at the same elevation as the upper boundary of the first square hole 11 and the lower boundary of the first square hole 11. The distance between the two side boundaries of the third rectangular hole 13 and the outer boundary of the box body 1 is 0.25m. Each pile body 2 is a pine pile or a concrete pile. The length of each pile body 2 is 8m. Each pile body 2 is closely arranged along the direction of water flow in the river. The pile body 2 includes a constant diameter pile body 201 and a variable diameter pile body 202. The constant diameter pile body 201 is arranged below the side wall of the box body 1. The variable diameter pile body 202 is fixedly connected to the concrete layer 3 inside the box body 1. The diameter of the constant diameter pile body 201 is 0.2m. The variable diameter pile body 202 includes a main support column 20201 and a variable diameter support column 20 202, the variable diameter support column 20202 is fixedly connected to the top of the main support column 20201, the diameter of the variable diameter support column 20202 is 0.12m, a transverse reserved through hole 14 is opened on the side wall of the variable diameter support column 20202, the aperture of the transverse reserved through hole 14 is 0.02m, and the transverse reserved through hole 14 is plugged with a pin 6, the block stone layer 4 is wrapped with a gabion net 7, and a geotextile 8 is laid between the block stone layer 4 and the planting soil layer 5. The geotextile 8 is also laid between the planting soil layer 5 and the contact surface of the inner wall of the box body 1, the height of the concrete layer 3 is 0.35m, the height of the block stone layer 4 is 0.55m, the height of the planting soil layer is 0.6m, the block stone particle size of the block stone layer 4 is 0.3m, and the unit area mass of the geotextile 8 is 350g / m 2 .

Claims

1. A foot protection structure for a U-shaped river in an urban area, characterized in that: The invention comprises a box body (1), wherein the box body (1) is fixedly connected to a plurality of pile bodies (2), each of the pile bodies (2) is located directly below the box body (1), and a concrete layer (3), a block stone layer (4) and a planting soil layer (5) are sequentially arranged in the box body (1) from bottom to top.

2. The foot protection structure for urban U-shaped river channel according to claim 1, characterized in that: The box body (1) is a trapezoidal body, and toes (9) are provided at the four corners of the bottom of the box body (1). The height of the toe (9) is 0.15m-0.2m, the bottom width of the toe (9) is 0.1m-0.15m, and the slope of the toe (9) is 1:0.5-1:0.

75. The box body (1) is provided with a cavity through hole (10) perpendicular to the top end surface, and the side walls of the box body (1) are respectively provided with a first square hole (11), a second square hole (12) and a third square hole (13), the cavity through hole (10) is connected to the first square hole (11), the second square hole (12) and the third square hole (13), the height of the box body (1) is 1m-1.5m, the length of the box body (1) is 1.5m-2m, the top width of the box body (1) is 0.8m-1m, the bottom width is 1m-1.2m, the wall thickness of the box body (1) is 0.1m-0.15m, and the river side slope ratio of the box body (1) is 1:0.2-1:0.

3.

3. The foot protection structure for urban U-shaped river channel according to claim 2 is characterized in that: The distance between the top boundary of the cavity through hole (10) and the outer boundary of the box body (1) is 0.1m-0.15m, the distance between the bottom boundary of the cavity through hole (10) and the outer boundary of the box body (1) is 0.2m-0.25m, the distance between the lower boundary of the first square hole (11) and the lower boundary of the second square hole (12) and the outer boundary of the box body (1) is 0.3m-0.35m, the distance between the upper boundary of the first square hole (11) and the upper boundary of the second square hole (12) and the outer boundary of the box body (1) is 0. The distances between the two side boundaries of the first square hole (11) and the two side boundaries of the second square hole (12) and the outer side boundary of the box body (1) are both 0.1m-0.15m; the upper boundary of the third square hole (13) and the lower boundary of the third square hole (13) are located at the same elevation as the upper boundary of the first square hole (11) and the lower boundary of the first square hole (11); the distances between the two side boundaries of the third square hole (13) and the outer side boundary of the box body (1) are 0.2m-0.25m.

4. The foot protection structure for urban U-shaped river channel according to claim 1, characterized in that: The length of each pile body (2) is 4m-8m, and each pile body (2) is densely arranged along the direction of water flow in the river.

5. The foot protection structure for urban U-shaped river channel according to claim 4, characterized in that: The pile body (2) comprises a constant diameter pile body (201) and a variable diameter pile body (202); the constant diameter pile body (201) is arranged below the side wall of the box body (1); and the variable diameter pile body (202) is fixedly connected to a concrete layer (3) inside the box body (1).

6. The foot protection structure for urban U-shaped river channel according to claim 5, characterized in that: The diameter of the equal-diameter pile body (201) is 0.1m-0.2m, and the variable-diameter pile body (202) comprises a main support column (20201) and a variable-diameter support column (20202), wherein the variable-diameter support column (20202) is fixedly connected to the top of the main support column (20201), the diameter of the variable-diameter support column (20202) is 0.05m-0.12m, and the diameter of the main support column (20201) is 0.1m-0.2m. A transverse reserved through hole (14) is opened on the side wall of the variable-diameter support column (20202), the aperture of the transverse reserved through hole (14) is 0.01m-0.02m, and a pin (6) is inserted into the transverse reserved through hole (14).

7. The foot protection structure for urban U-shaped river channel according to claim 1, characterized in that: The stone layer (4) is wrapped with a gabion net (7) on the outside, a geotextile (8) is laid between the stone layer (4) and the planting soil layer (5), and the geotextile (8) is also laid between the planting soil layer (5) and the contact surface of the inner wall of the box body (1), the height of the concrete layer (3) is 0.3m-0.35m, the height of the stone layer (4) is 0.3m-0.55m, and the height of the planting soil layer is 0.4m-0.6m.

8. The foot protection structure for urban U-shaped river channel according to claim 7, characterized in that: The particle size of the block stones in the block stone layer (4) is 0.1m-0.3m, and the unit area mass of the geotextile (8) is 250g / m 2 -350 g / m 2 .

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