Diversion tunnel water inlet cofferdam

Abstract

The utility model relates to the technical field of cofferdams, in particular to a diversion tunnel water inlet cofferdam. According to the technical scheme, the dam body structure comprises a dam body, a concrete pavement is poured on the dam body, dry stone revetments are arranged on the two sides of the dam body, the dam body structure further comprises an earth-rock mixture filled on the dry stone revetments, a concrete revetment is poured on the earth-rock mixture located on one side of an upstream face, and the concrete revetment is arranged on the side of the upstream face. A bagged soil protection slope is placed on the earth-rock mixture located on one side of the downstream face, the dam body is filled with the high-pressure-spraying anti-seepage wall close to one side of the upstream face, and the two sides of the high-pressure-spraying anti-seepage wall are filled with sandy soil. Water permeation can be effectively prevented through the high-pressure spraying anti-seepage wall, the dryness of a working area is guaranteed, and the stability of the whole dam body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cofferdams, in particular to a cofferdam at the water inlet of a diversion tunnel. Background Art

[0002] A diversion tunnel is a tunnel used for the purpose of construction diversion, mainly applicable to mountain rivers with narrow river valleys, steep banks and hard rocks. It is a temporary engineering structure, and one of its characteristics is that the construction period is often very urgent. If it cannot be completed on schedule, it will lead to an extension of the overall project construction period. During the construction period, the diversion tunnel is used to divert the water flow of the original river channel from in front of the upstream cofferdam to the tunnel behind the downstream cofferdam. The main function of the cofferdam is to temporarily block the water flow during the construction period, creating a water-free or water-level-controlled environment for the construction of the diversion tunnel or other hydraulic structures.

[0003] Water easily seeps from the side or bottom of the cofferdam, and it is impossible to ensure that the construction or maintenance area is dry. Content of the Utility Model

[0004] The purpose of the utility model is to propose a cofferdam at the water inlet of a diversion tunnel aiming at the problems existing in the background art.

[0005] The technical solution of the utility model: A cofferdam at the water inlet of a diversion tunnel, including a dam body, on which a concrete road surface is poured, dry rubble stone slopes are arranged on both sides of the dam body, and further includes:

[0006] An earth-rock mixture filled on the dry rubble stone slope, on the earth-rock mixture on the water-facing side, a concrete slope protection is poured, and on the earth-rock mixture on the backwater side, a bagged soil slope protection is placed;

[0007] A high-pressure jet grouting anti-seepage wall filled on the dam body and close to the water-facing side, and sandy soil is filled on both sides of the high-pressure jet grouting anti-seepage wall.

[0008] Optionally, 40 - 60 cm of macro slag is filled between the dry rubble stone slope on the water-facing side and the concrete slope protection, a 10 - 20 cm gravel cushion layer is laid on the macro slag, and 5 - 15 cm of concrete is poured on the gravel cushion layer.

[0009] Optionally, the thickness of the concrete slope protection is 10 - 20 cm.

[0010] Optionally, the thickness of the bagged soil slope protection is 30 - 50 cm.

[0011] Optionally, the high-pressure jet grouting anti-seepage wall penetrates through the silty clay gravel layer, and the depth of the high-pressure jet grouting anti-seepage wall entering the impervious layer is 0.5 - 0.6 m.

[0012] Optionally, a plurality of soil bags are stacked on the bagged soil slope protection, and a support structure for supporting and compensating the soil bags is arranged on the bagged soil slope protection.

[0013] Optionally, the support structure includes a plurality of support cylinders installed in the earth-rock mixture located on the water-receiving side. A support rod is slidably installed in the support cylinder. A spring is fixedly installed in the support cylinder. The other end of the spring is fixedly connected to the support rod. A tray is fixedly installed on the support rod. The soil bag is located above the tray.

[0014] Optionally, an anti-tipping mechanism is installed on the plurality of support cylinders. The anti-tipping mechanism includes two first connecting rods and one second connecting rod rotatably installed on the support cylinder. The two first connecting rods and the second connecting rod located on the same support cylinder are rotatably connected to each other. The first connecting rod is rotatably connected to the second connecting rod on the adjacent support cylinder. A fastening rod is fixedly installed on one of the support cylinders. A pile foundation is fixedly installed on one side of the dam body. The fastening rod is fixedly connected to the pile foundation.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] In the present application, dry rubble slopes are arranged on both sides of the dam body. The dry rubble slopes can adapt to the uneven settlement of the dam body and maintain the stability of the slope. The earth-rock mixture filled on the dry rubble slopes can further enhance the stability of the dam slope. The concrete slope protection can enhance the stability of the water-facing side of the dam body, especially in resisting water pressure and wave impact. The soil bag slope protection can enhance the stability of the water-receiving side of the dam body, especially in resisting water pressure and soil deformation. The high-pressure jet grouting cut-off wall can effectively prevent water seepage, ensure the dryness of the working area, and ensure the overall stability of the dam body.

[0017] Furthermore, when the soil inside the lower soil bag gradually loses, the spring drives the support rod to rise, and then the tray supports the soil bag, preventing the overall landslide caused by the reduction of the support received by the upper soil bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A cross-sectional view of the cofferdam of the present utility model is given;

[0019] Figure 2 Is a cross-sectional view of the soil bag slope protection of the present utility model;

[0020] Figure 3 Is a schematic structural view of the anti-tipping mechanism of the present utility model;

[0021] Figure 4 Is Figure 2 A partial enlarged view of A in

[0022] Figure 5 Is Figure 3 A partial enlarged view of B in

[0023] Reference numerals: 1, dam body; 101, concrete pavement; 102, dry rubble slope protection; 103, soil-rock mixture; 104, concrete slope protection; 105, soil-filled bag slope protection; 106, high-pressure jet grouting anti-seepage wall; 107, sandy soil; 2, soil bag; 201, support cylinder; 202, support rod; 203, spring; 204, tray; 205, first connecting rod; 206, second connecting rod; 207, fastening rod; 208, pile foundation. Detailed implementation manners

[0024] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1

[0026] As Figure 1 shown, a cofferdam at the water inlet of a diversion tunnel proposed by the present utility model includes a dam body 1, on which a concrete pavement 101 is poured, and dry rubble slope protections 102 are provided on both sides of the dam body 1. The dry rubble slope protections 102 can adapt to the uneven settlement of the dam body and maintain the stability of the slope. This is crucial for preventing the damage of the dam body caused by geological changes or external factors. The dry rubble slope protections 102 have good anti-freezing and swelling damage performance, which is particularly important for reservoirs in cold regions. The dry rubble slope protections 102 can effectively reduce the impact of waves on the dam body 1 and protect the safety of the dam body 1.

[0027] In this embodiment, a soil-rock mixture 103 filled on the dry rubble slope protection 102 is also included. The soil-rock mixture 103, as a part of the slope protection, can enhance the stability of the slope of the dam body 1. The use of this material helps to prevent the damage of the dam body 1 caused by external factors (such as water flow scouring, soil erosion, etc.). The soil-rock mixture 103 can effectively resist the scouring action of water flow and protect the dam body 1 from erosion. The use of the soil-rock mixture 103 enables the slope protection to better adapt to the uneven settlement of the dam body 1 and maintain its structural integrity and function.

[0028] Among them, a concrete slope protection 104 is poured on the soil-rock mixture 103 on the water-facing side, and the thickness of the concrete slope protection 104 is 15 cm. The concrete slope protection 104 can enhance the stability of the water-facing side of the dam body 1, especially in resisting water pressure and wave impact. The concrete slope protection 104 can effectively resist the scouring action of water flow on the dam body 1 and protect the dam body from erosion. On the soil-rock mixture 103 on the backwater side, a soil-filled bag slope protection 105 is placed, and the thickness of the soil-filled bag slope protection 105 is 40 cm. The soil-filled bag slope protection 105 can enhance the stability of the backwater side of the dam body 1, especially in resisting water pressure and soil deformation. This slope protection method can effectively prevent soil erosion caused by water flow or rainwater scouring and protect the structure of the dam body 1. The soil-filled bag slope protection 105 can use geotextile bags containing plant seeds, which helps the ecological restoration and protection of the slope.

[0029] Furthermore, 50 cm of macro slag is filled between the dry-laid stone revetment 102 and the concrete revetment 104 on the water-facing side. A 15 cm crushed stone cushion layer is laid on the macro slag, and 10 cm of concrete is poured on the crushed stone cushion layer. The macro slag, as part of the dam body 1, is usually used to fill and compact the dam body 1 to provide the stability of the foundation. It can enhance the structural strength of the dam body 1. At the same time, due to its good compaction performance, it can effectively reduce the voids inside the dam body 1 and improve the overall stability of the dam body 1. The crushed stone cushion layer is laid on the macro slag. It can disperse the pressure from the upper concrete layer and reduce the direct pressure on the lower macro slag layer. Due to its good drainage and shear strength, the crushed stone cushion layer can improve the overall stability of the dam body 1. The concrete layer is an important anti-seepage facility of the dam body, which can effectively prevent water seepage and protect the internal structure of the dam body.

[0030] In this embodiment, a high-pressure jet grouting anti-seepage wall 106 is filled on the dam body 1 near the water-facing side. The high-pressure jet grouting anti-seepage wall 106 is a diaphragm wall built in a loose pervious layer or an earth-rock dam, and its main function is to prevent water seepage. Sandy soil 107 is filled on both sides of the high-pressure jet grouting anti-seepage wall 106. Filling sandy soil on both sides of the high-pressure jet grouting anti-seepage wall 106 can further enhance the anti-seepage effect and prevent water from seeping through both sides of the wall. The high-pressure jet grouting anti-seepage wall 106 penetrates the silty clay gravel layer, and the depth of the high-pressure jet grouting anti-seepage wall 106 entering the impervious layer is 0.5 - 0.6 m. It effectively blocks the water flow through the silty clay gravel layer and enhances the overall anti-seepage effect.

[0031] Working principle: Dry-laid stone revetments 102 are set on both sides of the dam body 1. The dry-laid stone revetments 102 can adapt to the uneven settlement of the dam body and maintain the stability of the slope. The earth-rock mixture 103 filled on the dry-laid stone revetments 102 can further enhance the stability of the slope of the dam body 1. The concrete revetment 104 can enhance the stability of the water-facing side of the dam body 1, especially in resisting water pressure and wave impact. The bagged soil revetment 105 can enhance the stability of the backwater side of the dam body 1, especially in resisting water pressure and soil deformation. The high-pressure jet grouting anti-seepage wall 106 is used to prevent water seepage.

[0032] Embodiment 2

[0033] As Figures 2-5As shown, based on the first embodiment, a plurality of earth bags 2 are stacked on the bagged earth slope protection 105, and a support structure for supporting and compensating the earth bags 2 is provided on the bagged earth slope protection 105. After long-term use, if the earth bags 2 on the lower side of the bagged earth slope protection 105 set on the backwater side of the dam body 1 are damaged, the soil on the upper side will also be affected. The damage of the lower earth bags 2 will cause the internal soil to be lost, which may gradually weaken the support of the upper soil and cause more soil to move. The stability of the bagged earth slope protection depends on the overall structure formed by the stacking of earth bags 2. The damage of the lower earth bags 2 will destroy this structure, reduce the support of the upper soil, and thus reduce the stability of the entire slope protection. Once the lower earth bags 2 are damaged, the upper earth bags 2 may be damaged in turn due to the loss of support from below, forming a chain reaction, resulting in large-scale instability of the slope protection. Therefore, it is necessary to support the earth bags 2 to reduce the impact of the lower earth bags 2 on the upper earth bags when they are damaged.

[0034] Furthermore, the support structure includes a plurality of support cylinders 201 installed in the soil-rock mixture 103 on the backwater side, a support rod 202 is slidably installed in the support cylinder 201, a spring 203 is fixedly installed in the support cylinder 201, the other end of the spring 203 is fixedly connected to the support rod 202, a tray 204 is fixedly installed on the support rod 202, and the earthbag 2 is located above the tray 204. When the soil inside the earthbag 2 gradually loses, the support rod 202 is driven to rise by the spring 203, and then the earthbag 2 is supported by the tray 204, so as to prevent the overall landslide caused by the reduction of support for the upper earthbag 2.

[0035] In this embodiment, an anti-dumping mechanism is installed on multiple support tubes 201, and the anti-dumping mechanism includes two first connecting rods 205 and one second connecting rod 206 rotatably installed on the support tube 201. The two first connecting rods 205 and the second connecting rod 206 located on the same support tube 201 are rotatably connected to each other, and the first connecting rod 205 is rotatably connected to the second connecting rod 206 on the adjacent support tube 201. A fastening rod 207 is fixedly installed on one of the support tubes 201, and a pile foundation 208 is fixedly installed on one side of the dam body 1, and the fastening rod 207 is fixedly connected to the pile foundation 208. The support tube 201 located in the soil-rock mixture 103 is prone to tilt, which will cause the pallet 204 to be unable to effectively support the earthbag. By connecting multiple support tubes 201 through the first connecting rod 205 and the second connecting rod 206, the multiple support tubes 201 can be moved synchronously, so that the multiple support tubes 201 can evenly distribute the force exerted on a single support tube 201, thereby improving the overall stability of the support tube 201. By further supporting the support tube 201 through the fastening rod 207 and the pile foundation 208, the tilting of the multiple support tubes 201 can be effectively prevented.

[0036] Working principle: When the soil inside the earthbag 2 gradually drains away, the support rod 202 is driven upward by the spring 203, and then the earthbag 2 is supported by the tray 204 to prevent the overall landslide caused by the reduced support of the upper earthbag 2. By connecting multiple support cylinders 201 through the first connecting rod 205 and the second connecting rod 206, multiple support cylinders 201 can be moved synchronously, so that multiple support cylinders 201 can evenly distribute the force received by a single support cylinder 201, thereby improving the overall stability of the support cylinder 201, and further supporting the support cylinder 201 through the fastening rod 207 and the pile foundation 208 can effectively prevent multiple support cylinders 201 from tilting.

[0037] The above-mentioned specific embodiments are only several optional embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A diversion tunnel intake cofferdam, comprising a dam body (1), on which a concrete road surface (101) is poured, and dry stone revetments (102) are arranged on both sides of the dam body (1), characterized in that, Also included are: The earth-rock mixture (103) filled on the dry rubble slope protection (102), on the earth-rock mixture (103) on the water-facing side, a concrete slope protection (104) is poured, and on the earth-rock mixture (103) on the backwater side, a bagged soil slope protection (105) is placed; The high-pressure jet grouting impervious wall (106) filled on the dam body (1) and close to the water-facing side, and sand (107) is filled on both sides of the high-pressure jet grouting impervious wall (106).

2. The cofferdam at the intake of the diversion tunnel according to claim 1, characterized in that, 40-60 cm of macro slag is filled between the dry rubble slope protection (102) on the water-facing side and the concrete slope protection (104), a 10-20 cm gravel cushion layer is laid on the macro slag, and 5-15 cm of concrete is poured on the gravel cushion layer.

3. A cofferdam for the intake of a diversion tunnel according to claim 1, characterized in that, The thickness of the concrete slope protection (104) is 10-20 cm.

4. A cofferdam for the intake of a diversion tunnel according to claim 1, characterized in that, The thickness of the bagged soil slope protection (105) is 30-50 cm.

5. A cofferdam for the intake of a diversion tunnel according to claim 1, characterized in that, The high-pressure jet grouting impervious wall (106) penetrates through the silty clay gravel layer, and the depth of the high-pressure jet grouting impervious wall (106) entering the impervious layer is 0.5-0.6 m.

6. A cofferdam for the intake of a diversion tunnel according to claim 1, characterized in that, A plurality of soil bags (2) are stacked on the bagged soil slope protection (105), and a support structure for supporting and compensating the soil bags (2) is provided on the bagged soil slope protection (105).

7. A cofferdam for the intake of a diversion tunnel according to claim 6, characterized in that, The support structure includes a plurality of support cylinders (201) installed in the earth-rock mixture (103) on the backwater side, a support rod (202) is slidably installed in the support cylinder (201), a spring (203) is fixedly installed in the support cylinder (201), the other end of the spring (203) is fixedly connected to the support rod (202), a tray (204) is fixedly installed on the support rod (202), and the soil bag (2) is located above the tray (204).

8. A cofferdam for the intake of a diversion tunnel according to claim 7, characterized in that, An anti-tipping mechanism is installed on a plurality of the support cylinders (201), the anti-tipping mechanism includes two first connecting rods (205) and a second connecting rod (206) rotatably installed on the support cylinder (201), the two first connecting rods (205) and the second connecting rod (206) on the same support cylinder (201) are rotatably connected to each other, the first connecting rod (205) is rotatably connected to the second connecting rod (206) on the adjacent support cylinder (201), a fastening rod (207) is fixedly installed on one of the support cylinders (201), and a pile foundation (208) is fixedly installed on one side of the dam body (1), and the fastening rod (207) is fixedly connected to the pile foundation (208).

Images