Water drainage rod for repairing retaining wall water drainage hole

Abstract

The utility model discloses a water drainage rod for repairing retaining wall water drainage holes, which comprises a shell, a filter element baffle is arranged in the shell, and the interior of the shell is divided into a water filtering section and a water drainage section which are communicated with each other by the filter element baffle; a plurality of water filtering holes are formed outside the shell and are used for introducing water outside the shell into the water filtering section; a water filtering section is arranged in the shell, an inverted filter element is arranged in the water filtering section and comprises water seepage geotechnical cloth, broken stones and gravels, the water seepage geotechnical cloth wraps the inner wall of the shell, a hollow cylindrical lining layer is formed in the water filtering section, the broken stones and the gravels are sequentially laid in the lining layer from bottom to top, and the lining layer is filled with the broken stones and the gravels. When it is found that the water drainage hole loses efficacy or partially loses efficacy, the water drainage rod is inserted into the soil body in an inclined mode, seepage water in the soil body is led into the water filtering section from the water filtering hole, is filtered through the inverted filter element and then penetrates through the filter element baffle to be drained out of the water drainage section, and therefore the water drainage hole is repaired in time, the quality of the retaining wall is guaranteed, and the service life of the retaining wall is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical fields of geological disaster control and ecological engineering restoration, and relates to a water discharge rod for repairing a water discharge hole of a retaining wall. Background Art

[0002] In geological disaster control and ecological engineering restoration, retaining walls are an important and common engineering technical measure. In actual work, due to problems such as construction technology or construction management, within 2 - 3 hydrological years after the completion of the project governance, or even within 1 hydrological year, there are often many cases of retaining wall instability and water damage. Excluding some cases of engineering quality problems caused by reasons such as retaining wall foundation and retaining wall materials, most common reasons are problems with the water discharge holes, which are briefly summarized as follows: First, due to the failure of the water discharge holes, water damage to the retaining wall occurs. Under the condition of heavy rainfall during the flood season, the seepage water in the soil behind the retaining wall cannot be discharged. On the one hand, it increases the soil weight, and on the other hand, as the water content in the soil gradually increases, the shear strength of the soil rapidly decays. Under the combined action of various factors, the wall exceeds the design load and undergoes sliding failure or toppling failure; Second, due to problems with the filter bag inside the water discharge hole, during the drainage process, the soil behind the wall is carried out of the wall with the water flow. On the one hand, it causes the soil behind the wall to be hollowed out, and it is easy for the retaining wall with an inclined back to collapse due to loss of support. On the other hand, after the soil behind the wall is washed out by the water flow, it blocks the water discharge hole, resulting in the water discharge hole being unable to play its designed role, and the retaining wall is prone to sliding failure or toppling failure. There are numerous cases of water damage to retaining walls caused by the failure of the water discharge holes. Therefore, when it is found that the water discharge holes are ineffective or partially ineffective, timely repair of the water discharge holes is of great significance for ensuring the quality of the retaining wall and extending the service life of the retaining wall. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a water discharge rod for repairing a water discharge hole of a retaining wall to solve the technical problems mentioned in the prior art.

[0004] A water discharge rod for repairing a water discharge hole of a retaining wall, the water discharge rod includes a housing, and a filter element baffle is arranged inside the housing. The filter element baffle divides the interior of the housing into two mutually communicating water filtering sections and a drainage section;

[0005] A number of water filtering holes are arranged on the housing, and the water filtering holes are located in the water filtering section. The water filtering holes are used to introduce the water outside the housing into the water filtering section;

[0006] An anti - filter element is arranged in the water filtering section. The anti - filter element includes:

[0007] A permeable geotextile is wrapped on the inner wall of the housing and forms a hollow cylindrical inner lining layer in the water filtering section. Broken stones and gravel are sequentially laid from bottom to top in the inner lining layer, and the broken stones and the gravel fill the inner lining layer.

[0008] Optionally, the housing is a galvanized steel pipe, and the wall thickness of the galvanized steel pipe is ≥ 3.0 mm.

[0009] Optionally, the water filtering holes are distributed on a part of the outer circumference of the housing and are located in the upper half of the water filtering section.

[0010] Optionally, the aperture size of the water filtering holes is 8 - 12 mm, and the center distance between two adjacent water filtering holes is 25 - 35 mm.

[0011] Optionally, the equivalent aperture of the geotextile of the permeable geotextile is not greater than the soil layer d behind the wall 85 , where d 85 is the mass of soil particles smaller than the aperture accounting for 85% of the total mass of soil particles;

[0012] The permeability coefficient of the geotextile of the permeable geotextile is not less than 10 times the permeability coefficient of the soil layer.

[0013] Optionally, the laying thickness of the gravel is 1 / 5 - 1 / 3 of the internal height of the housing, and the gravel is blocked inside the water filtering holes and at one end of the water filtering section away from the filter element baffle.

[0014] Optionally, the particle size of the gravel is 1 - 4 mm.

[0015] Optionally, the particle size of the crushed stone is 18 - 22 mm.

[0016] Optionally, a blade foot is provided at one end of the housing close to the water filtering section, and the blade foot is in an open shape;

[0017] The blade angle of the blade foot is set to 30 - 45°, and the blade thickness of the blade foot is not greater than 1.6 mm.

[0018] The beneficial effects that the present utility model can produce include:

[0019] 1) For the water discharge rod for repairing the water discharge holes of the retaining wall provided by the present utility model, when it is found that the water discharge holes fail or partially fail, the water discharge rod is inserted into the soil in an upward inclined manner, so that the seepage water in the soil is introduced into the water filtering section from the water filtering holes, and after being filtered by the reverse filter element, it passes through the filter element baffle and is discharged from the drainage section, thereby timely repairing the water discharge holes, ensuring the quality of the retaining wall and extending the service life of the retaining wall.

[0020] 2) For the water discharge rod for repairing the water discharge holes of the retaining wall provided by the present utility model, by arranging a geotextile, gravel and crushed stone along the direction of soil water seepage to form a reverse filter element of the water discharge rod, the soil retention property and water permeability of the water filtering section can be effectively ensured, and while realizing the drainage function of the water discharge holes, the problems of cavity formation behind the wall and blockage of the water discharge holes caused by the soil being carried out by the water flow are avoided.

[0021] 3) The water discharge rod provided by the present utility model for repairing the water discharge holes of retaining walls can be smoothly inserted into the soil body after clearing the holes and necessary reaming of the original failed water discharge holes by setting a blade foot, and the disturbance to the original wall and soil body can be minimized to the greatest extent.

[0022] 4) Since the water discharge holes of the water discharge rod provided by the present utility model for repairing the water discharge holes of retaining walls all have an upward slope of not less than 5%, by setting a filter element baffle, the anti-filter element inside the pipe can be fixed to prevent the anti-filter element from sliding out under the action of the downward sliding force and seepage force. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the water discharge rod provided by the present utility model for repairing the water discharge holes of retaining walls;

[0024] Figure 2 In the present utility model Figure 1 is a cross-sectional view of the water filtering section;

[0025] Figure 3 In the present utility model Figure 1 is a schematic structural diagram of the gravel and sand at the blade foot;

[0026] Figure 4 is a simplified installation diagram of the water discharge rod of the present utility model;

[0027] In the figure: 1, housing; 2, filter element baffle; 3, water filtering section; 4, drainage section; 5, water filtering holes; 6, permeable geotextile; 7, gravel; 8, sand and gravel; 9, blade foot. Detailed Embodiments

[0028] The present utility model will be described in detail below with reference to the drawings and embodiments, but the present utility model is not limited to these embodiments.

[0029] Such as Figures 1-3As shown in the figure, the utility model provides a water discharge rod for repairing the water discharge holes of a retaining wall. The water discharge rod includes a housing 1. Inside the housing 1, a filter element baffle 2 is provided. The filter element baffle 2 divides the interior of the housing 1 into two interconnected water filtering sections 3 and a drainage section 4. A number of water filtering holes 5 are opened on the housing 1. The water filtering holes 5 are located in the water filtering section 3 and are used to introduce the water outside the housing 1 into the water filtering section 3. An anti-filter element is provided in the water filtering section 3. The anti-filter element is positioned and installed through the filter element baffle 2. After the anti-filter element is installed, the filter element baffle 2 is welded to the inner wall of the housing 1, which is convenient for adaptively adjusting the length of the anti-filter element according to the design requirements. The anti-filter element includes a permeable geotextile 6, gravel 7 and sand and gravel 8. Among them, the permeable geotextile 6 is wrapped on the inner wall of the housing 1 and forms a hollow cylindrical inner lining layer in the water filtering section 3. Gravel 7 and sand and gravel 8 are laid in sequence from bottom to top in the inner lining layer, and the gravel 7 and sand and gravel 8 fill the inner lining layer. Specifically, when it is found that the water discharge hole fails or partially fails, the water discharge rod is inserted into the soil in an inclined upward manner until the water filtering section 3 extends to the slip surface, and the inclined upward slope is not less than 5%, so that the filter element baffle 2 fixes the anti-filter element to ensure that it does not slide down, and the seepage water in the soil can be introduced into the water filtering section 3 from the water filtering holes 5, and then filtered through the anti-filter element and discharged from the drainage section 4 through the filter element baffle 2, so as to repair the water discharge hole in time, ensure the quality of the retaining wall and extend the service life of the retaining wall. At the same time, the water discharge rods can be arranged in a plum blossom shape in the retaining wall according to the specific situation, so as to quickly discharge the seepage water in the soil to the greatest extent.

[0030] In the above, the housing 1 is a galvanized steel pipe, and the wall thickness of the galvanized steel pipe is ≥3.0 mm, which can increase the corrosion resistance of the steel pipe and extend the service life. At the same time, the water filtering holes 5 are distributed on a part of the outer circumference of the housing 1 and are located in the upper half of the water filtering section 3, and the seepage water in the soil above the water discharge rod can be intercepted and discharged. Among them, the aperture size of the water filtering holes 5 is 8 - 12 mm, and the center distance between two adjacent water filtering holes 5 is 25 - 35 mm, so that they are evenly distributed. In this embodiment, the wall thickness of the galvanized steel pipe is 5 mm, the aperture size of the water filtering holes 5 on the galvanized steel pipe is 10 mm, and the center distance between two adjacent water filtering holes 5 is 30 mm.

[0031] In the above, the permeable geotextile 6 is adhesively fixed on the inner surface of the galvanized steel pipe. The equivalent aperture of the geotextile of the permeable geotextile 6 is not greater than the soil layer d behind the wall 85 , where d 85 is the mass of soil particles smaller than the aperture accounts for 85% of the total mass of soil particles; the permeability coefficient of the geotextile of the permeable geotextile 6 is not less than 10 times the permeability coefficient of the soil layer. Specifically, the specification of the permeable geotextile 6 is 300 g / m 2, so as to meet the requirements of soil retention and anti-blocking. Then, a layer of gravel 7 with a particle size of 18 - 22 mm is laid and evenly spread at the inner bottom of the permeable geotextile 6. In this embodiment, gravel 7 with a particle size of 20 mm is selected, and after laying, an arc-shaped protrusion is formed at the top of the gravel 7 layer. Then, gravel 8 with a particle size of 1 - 4 mm is filled between the opposite surface of the arc-shaped protrusion and the permeable geotextile 6 to form a gravel layer. Among them, the laying thickness of the gravel 8 is 1 / 5 - 1 / 3 of the internal height of the housing 1. In this embodiment, the diameter of the galvanized steel pipe is 100 mm, and the laying thickness of the gravel 8 is 20 - 33.3 mm. Preferably, a gravel layer with a thickness of 25 mm is laid on the top of the gravel layer, and the gravel 8 blocks the inside of the water filtering holes 5 and one end of the water filtering section 3 away from the filter element baffle 2, which can effectively ensure the soil retention and water permeability of the water filtering section 3, realize the drainage function of the drain hole while avoiding the problems of wall-back cavities and drain hole blockage caused by the soil being carried out by the water flow.

[0032] In the above, a cutting edge 9 is provided at one end of the housing 1 close to the water filtering section 3, and the cutting edge 9 is in an open shape. After clearing the hole and necessary reaming of the original failed drain hole, the drain rod can be smoothly inserted into the soil, and the disturbance to the original wall and soil can be minimized; among them, the blade angle of the cutting edge 9 is set to 30 - 45°, and the blade thickness of the cutting edge 9 is not greater than 1.6 mm.

[0033] In the above embodiment, when determining the length of the drain rod, first design the length dimension of the drain rod according to the actual situation of the retaining wall to be repaired, and ensure that the length of the drain rod extends to the groundwater enrichment area or the potential slip surface. When the slip surface is not clear, it can be estimated according to the Rankine active earth pressure rupture angle (45° + φ / 2), and the specific calculation can be carried out according to the following formula:

[0034] L = L1 + L2 + 0.2

[0035] L1 = S1 / cos(θ)

[0036] L2 = S2 / cos(θ)

[0037] In the formula: L is the length of the drain rod (m), L1 is the length of the water filtering section 3 (m), L2 is the length of the drainage section 4 (m), S1 is the horizontal distance from the potential slip surface to the wall back (m), S2 is the thickness of the retaining wall at this place (m), and θ is the inclination angle of the drain hole (°).

[0038] In the above embodiment, as Figure 4As shown in the figure, when installing the drain rod into the soil body, first clean and appropriately ream the original drain hole to ensure the smooth installation of the drain rod. Then, after the cleaning and reaming are completed, apply an appropriate amount of vaseline to the outer wall of the drain rod to reduce the side wall frictional resistance of the drain rod. Next, insert the drain rod into the drain hole so that the filter section 3 is located in the soil body behind the wall and the drainage section 4 is located inside the retaining wall. After fixing the drain rod, fill the gap between the outer wall of the drain rod and the hole wall of the retaining wall with cement mortar, and smooth and close the outer surface of the retaining wall, thus completing the overall installation of the drain rod.

[0039] The above are only several embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, making some changes or modifications using the disclosed technical content above is equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A drainage rod for repairing a drainage hole in a retaining wall, the drainage rod comprising a housing (1), characterized in that: A filter element baffle (2) is arranged inside the housing (1), and the filter element baffle (2) divides the interior of the housing (1) into two interconnected water filtering sections (3) and drainage sections (4); The shell (1) is provided with a plurality of water filtering holes (5), the water filtering holes (5) are located in the water filtering section (3), and the water filtering holes (5) are used to introduce water outside the shell (1) into the water filtering section (3); The water filtering section (3) is provided with a reverse filter element, and the reverse filter element comprises: A permeable geotextile (6) is wrapped around the inner wall of the shell (1) and forms a hollow cylindrical inner lining layer in the water filtration section (3), wherein crushed stone (7) and gravel (8) are laid in sequence from bottom to top in the inner lining layer, and the crushed stone (7) and gravel (8) fill the inner lining layer.

2. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: The shell (1) is a galvanized steel pipe, and the wall thickness of the galvanized steel pipe is ≥3.0 mm.

3. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: The water filtering holes (5) are distributed on part of the outer circumference of the shell (1) and are located in the upper half of the water filtering section (3).

4. A drain rod for repairing a drain hole in a retaining wall according to any one of claims 1 to 3, characterized in that: The diameter of the water filter holes (5) is 8 to 12 mm, and the center distance between two adjacent water filter holes (5) is 25 to 35 mm.

5. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: The equivalent pore size of the geotextile of the permeable geotextile (6) is not greater than the soil layer behind the wall. 85 , where d 85 The mass of soil particles smaller than this pore size accounts for 85% of the total mass of soil particles; The permeability coefficient of the geotextile of the permeable geotextile (6) is not less than 10 times the permeability coefficient of the soil layer.

6. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: The laying thickness of the gravel (8) is 1 / 5 to 1 / 3 of the internal height of the shell (1), and the gravel (8) blocks the inner side of the water filter hole (5) and the end of the water filter section (3) away from the filter element baffle (2).

7. A drain rod for repairing a drain hole in a retaining wall according to claim 6, characterized in that: The particle size of the gravel (8) is 1 to 4 mm.

8. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: The particle size of the crushed stone (7) is 18 to 22 mm.

9. A drain rod for repairing a drain hole in a retaining wall according to claim 1, characterized in that: A blade foot (9) is provided at one end of the shell (1) close to the water filtering section (3), and the blade foot (9) is open; The cutting edge angle of the cutting foot (9) is set to 30-45°, and the cutting edge thickness of the cutting foot (9) is not greater than 1.6 mm.

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