A device, method and application of bank slope protection in fine sand formation

Abstract

A bank slope protection device for fine sand formations is characterized by comprising multiple protection modules, each comprising a wave-breaking grid unit and an ecological anti-fouling screen; the wave-breaking grid unit comprising grid holes, energy dissipation plates, and wave-breaking pipes; the ecological anti-fouling screen comprising two geogrids and bagasse located between the two geogrids, utilizing the dense fibers of the bagasse to form a barrier that blocks suspended particles in the inner waters and also utilizing the adsorption properties of the bagasse to absorb some suspended particles in the water; multiple wave-breaking pipes are arranged and fixedly connected to the side of the ecological anti-fouling screen away from the shore, the side of the wave-breaking pipe away from the ecological anti-fouling screen having multiple grid holes to allow wave energy to enter the wave-breaking pipe and be dissipated; each wave-breaking pipe is provided with multiple energy dissipation plates located inside and connected to the wave-breaking pipe, so that when waves enter the wave-breaking pipe, the wave energy is divided by the energy dissipation plates. The protection module designed in the present invention can be flexibly adjusted in length and can be applied to construction excavation surfaces of different lengths, thus having strong adaptability; and is simple to set up and convenient to use.

Description

Technical Field

[0001] The invention relates to the field of bank protection engineering, in particular to a bank slope protection method constructed by underwater formwork bag concrete in fine sand strata. Background Art

[0002] Canal construction creates artificial channels through excavation. After excavation, slope protection is necessary to create a strong bank. Bag concrete is widely used in bank protection due to its advantages such as fast construction speed and underwater construction capabilities. However, during bank construction, the impact of ship waves generated by construction vessels often impacts the bank before the slope protection is applied, which can easily lead to initial slope failure, especially in silty sand formations.

[0003] At present, there is no suitable method to eliminate this impact. It can only be reduced by shortening the excavation surface, shortening the slope protection construction time, etc., which makes it difficult to control the quality of project construction. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a method for protecting the bank slope of the silt and fine sand formation during underwater formwork bag concrete construction. A protection module is set near the bank slope to divide the water area into inner and outer water areas. When the ship waves in the outer water area pass through the protection module, most of the waves are eliminated by the wave-breaking grid unit, and are further blocked when passing through the ecological anti-fouling screen, so that the ship waves are greatly reduced, ensuring the safety of the silt and fine sand formation slope. At the same time, by setting up the ecological anti-fouling screen, the suspended particles in the inner water area are blocked from overflowing into the natural river, protecting the river ecological environment. The present invention has the advantages of strong practicality, low cost, durability, and environmental protection, and is particularly suitable for protecting the bank slope of the silt and fine sand formation during underwater formwork bag concrete construction.

[0005] The present invention provides a silt-fine sand stratum bank slope protection device, the silt-fine sand stratum bank slope protection device comprises a plurality of protection modules, the protection modules include a wave-breaking grid unit and an ecological anti-fouling screen;

[0006] The wave-absorbing grid unit includes grid holes, energy dissipation sheets, and wave-absorbing pipes;

[0007] The ecological anti-fouling screen comprises two geogrids and bagasse located between the two geogrids. The dense fibers of the bagasse form a barrier to block suspended particles in the inner waters. The adsorption properties of the bagasse can also be used to absorb some suspended particles in the water.

[0008] A plurality of the wave-breaking pipes are arranged and fixedly connected to the side of the ecological anti-fouling screen away from the shore. The side of the wave-breaking pipe away from the ecological anti-fouling screen is provided with a plurality of grille holes so that wave energy can enter the wave-breaking pipe and be dissipated.

[0009] A plurality of energy dissipation plates are provided on the inner side of each wave-breaking tube. The energy dissipation plates are located inside the wave-breaking tube and are connected to the wave-breaking tube. When waves enter the wave-breaking tube, the energy of the waves is divided by the energy dissipation plates.

[0010] Preferably, the grille holes are in the form of long strips and / or diamonds, and the cross-sectional length of the holes is greater than or equal to half the circumference of the wave-breaking pipe; the energy dissipation plates are arranged perpendicularly and / or parallel to each other; and the cross-sectional shape of the wave-breaking pipe is circular and / or square.

[0011] Preferably, the ecological anti-fouling screen is removable. When the ecological anti-fouling screen absorbs a large amount of suspended particles, the ecological anti-fouling screen can be removed from the wave-breaking grid unit and replaced with a new ecological anti-fouling screen; the ecological anti-fouling screen that absorbs a large amount of suspended particles can be used for crops to provide a carbon source.

[0012] Preferably, the thickness of the bagasse is 3 cm to 5 cm.

[0013] Preferably, it further comprises a float and a counterweight, the protection module is connected below the float, and the counterweight is hung below the wave-breaking grid unit.

[0014] The present invention also provides a method for protecting a bank slope in a fine sand formation based on the above-mentioned device, which utilizes the wave-breaking and barrier functions of the wave-breaking grid unit and the ecological anti-fouling screen to reduce the impact of waves in the outer waters and simultaneously prevent the overflow of suspended particles in the inner waters. The method specifically includes the following steps:

[0015] Step 1: After the bank slope is excavated and before the bagged concrete is laid, protective modules are placed in the construction water area. The protective modules are connected with ropes to close the construction surface, forming inner and outer water areas. The number of protective modules placed is determined according to the actual length of the construction area.

[0016] Step 2: laying the concrete bags and pouring the concrete;

[0017] Step 3: After the concrete pouring is completed, move the protection module to the next construction area;

[0018] Step 4: Repeat steps 1 to 3 to complete the construction of the entire slope.

[0019] Preferably, the lowest part of the protection module is required to be no more than 30 cm away from the slope surface, and the depth H of the protection module is determined by the relationship H≥h w -0.3, where h w It is the height from the water level plane to the slope surface, in meters.

[0020] Preferably, the wave-absorbing tube and the energy-dissipating plate are made of lightweight aluminum or plastic plates to resist water corrosion.

[0021] Preferably, the gravity of the counterweight is determined according to the buoyancy of the float and the water flow velocity.

[0022] The present invention has the following technical effects:

[0023] 1. The protective module designed in the present invention can be flexibly adjusted in length and can be applied to construction excavation surfaces of different lengths, with strong adaptability; and it is simple to set up and easy to use.

[0024] 2. The present invention can quickly eliminate the energy of waves by arranging a large number of energy dissipation sheets in the wave-absorbing tube, greatly reducing the impact of waves on the stability of fine strata.

[0025] 3. This invention utilizes bagasse to create an ecological anti-fouling screen, achieving high-value comprehensive utilization of bagasse. Furthermore, the used ecological anti-fouling screen, which has absorbed a large amount of suspended particles, can be used for land cultivation or directly landfilled. This is because bagasse naturally reduces its value and provides a carbon source for vegetation growth. This invention is eco-friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the cross-sectional view of the slope protection constructed by underwater formwork bags in fine sand strata.

[0027] Figure 2 Horizontal and vertical views of the slope protection constructed using underwater formwork bags in fine sand formations.

[0028] Figure 3 This is the protection module diagram.

[0029] Figure 4 This is the AA cross-section of the protection module of the circular wave-breaking grid unit.

[0030] Figure 5 This is the AA cross-section of the protection module of the square wave-breaking grid unit.

[0031] Figure 6 This is the left view of the square wave-breaking grid unit.

[0032] Figure 7 This is a cross-sectional view of the ecological anti-fouling screen.

[0033] Figure 8 This is a front view of a protection module.

[0034] Figure 9 This is the on-site construction drawing.

[0035] The reference numbers in the figure are: 1-fill layer; 2-fine sand layer; 3-medium weathered mudstone layer; 4-top surface of the slope; 5-external water area; 6-inner water area; 7-suspended particles; 8-protection module; 9-bank slope; 10-bag concrete; 20-wave-breaking grid unit; 21-grid hole; 22-bolt; 23-energy dissipation plate; 24-wave-breaking pipe; 30-ecological anti-fouling screen; 31-geogrid; 32-bagasse; 33-nylon rope; 41-floating cylinder; 42-wire rope; 43-counterweight. Specific embodiments

[0036] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0037] Example 1

[0038] This implementation case is a channel revetment construction project for a canal project. There is a domestic water intake downstream of the channel, and the environmental protection requirements for the construction are high. The channel of this project is 9m deep, and there is a fine sand layer within the range of 2.5m-6.5m below the ground. The revetment structure is mold bag concrete, the slope of the bank is 55°, and the normal water level during the construction period is 1.5m below the ground. In order to prevent the bank from being damaged by ship waves and to protect the downstream water source, this project adopts the present invention for bank protection. In order to prevent the bank from becoming unstable, the length of the construction surface is controlled, and each construction surface is 5m long. Each protection module is 2m long and is equipped with a circular wave-breaking pipe with a diameter of 30cm. The wave-breaking pipe is made of aluminum alloy. Six protection modules are placed on each construction surface and connected to each other by steel wire ropes. The floating tube is made of an inflatable mold bag, and the counterweight is an iron chain with a weight of 100kg per meter. The ecological anti-fouling screen consists of two geogrids, bagasse, and nylon rope. 5cm thick bagasse is sandwiched between the two geogrids and sealed with nylon rope to form a whole. To achieve slope shaping, the main steps include:

[0039] Step 1: After the bank slope is excavated and before the bagged concrete is laid, protective modules are placed in the construction water area. Steel wire ropes are used to connect the modules to close the construction surface, forming inner and outer water areas.

[0040] Step 2: Lay the bagged concrete and pour the concrete.

[0041] Step 3: After the concrete pouring is completed, move the protection module to the next construction area.

[0042] Step 4: Repeat steps 1 to 3 to complete the construction of the entire slope.

[0043] The specific positions of the various parts and their interconnected relationships can be clearly seen through the accompanying drawings. These drawings provide visual support for the specific embodiments of the present invention and help to understand its technical principles and practical applications.

[0044] Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A method for protecting a bank slope in a fine sand stratum based on a bank slope protection device for a fine sand stratum, characterized in that: The silt and fine sand stratum slope protection device includes a plurality of protection modules, each of which includes a wave-breaking grid unit and an ecological anti-fouling screen; The wave-absorbing grid unit includes grid holes, energy dissipation sheets, and wave-absorbing pipes; The ecological anti-fouling screen comprises two geogrids and bagasse located between the two geogrids. The dense fibers of the bagasse form a barrier to block suspended particles in the inner waters. The adsorption properties of the bagasse can also be used to absorb some suspended particles in the water. A plurality of the wave-breaking pipes are arranged and fixedly connected to the side of the ecological anti-fouling screen away from the shore. The side of the wave-breaking pipe away from the ecological anti-fouling screen is provided with a plurality of grille holes so that wave energy can enter the wave-breaking pipe and be dissipated. Each wave-absorbing tube is provided with a plurality of energy-dissipating plates on the inside. The energy-dissipating plates are located on the inside of the wave-absorbing tube and are connected to the wave-absorbing tube. When the wave enters the wave-absorbing tube, the energy of the wave is divided by the energy-dissipating plates. The grid holes are in the form of long strips and / or diamonds, and the cross-sectional length of the holes is greater than or equal to half the circumference of the wave-absorbing pipe; the energy dissipation sheets are arranged perpendicularly and / or parallel to each other; the cross-sectional shape of the wave-absorbing pipe is circular and / or square; The ecological anti-fouling screen is removable. When the ecological anti-fouling screen absorbs a large amount of suspended particles, the ecological anti-fouling screen can be removed from the wave-breaking grid unit and replaced with a new ecological anti-fouling screen. The ecological anti-fouling screen that absorbs a large amount of suspended particles can be used to provide a carbon source for crops. The device also includes a float and a counterweight, the protection module is connected below the float, and the counterweight is hung below the wave-breaking grid unit; The wave-breaking and blocking functions of the wave-breaking grid unit and the ecological anti-fouling screen are used to reduce the impact of waves in the outer waters and prevent the overflow of suspended particles in the inner waters. The specific steps include: Step 1: After the bank slope is excavated and before the bagged concrete is laid, protective modules are placed in the construction water area. The protective modules are connected with ropes to close the construction surface, forming inner and outer water areas. The number of protective modules placed is determined according to the actual length of the construction area. Step 2: laying the concrete bags and pouring the concrete; Step 3: After the concrete pouring is completed, move the protection module to the next construction area; Step 4: Repeat steps 1 to 3 to complete the construction of the entire slope.

2. The protection method according to claim 1, characterized in that: The lowest part of the protection module is required to be no more than 30 cm away from the slope surface, and the depth H of the protection module is determined by the relationship H≥h w -0.3, where h w It is the height from the water level plane to the slope surface, in meters.

3. The protection method according to claim 1, characterized in that: The wave-absorbing pipe and the energy-absorbing sheet are made of lightweight aluminum or plastic plates to resist water corrosion.

4. The protection method according to claim 1, characterized in that: The gravity of the counterweight is determined according to the buoyancy of the float and the water flow velocity.

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