Emergency disposal device for preventing seepage failure of earth and rockfill dam

Abstract

The utility model discloses an emergency disposal device for preventing seepage failure of an earth and rockfill dam, which belongs to the technical field of hydraulic engineering construction and comprises a plurality of spiral drainage pipes and a reinforced three-dimensional drainage net pad. A pointed conical anchor head is arranged at the head of the spiral drainage pipe, a spiral wing and a plurality of water inlet holes are arranged on the peripheral surface of the spiral drainage pipe, a connector is arranged at the tail of the spiral drainage pipe, and the connector is detachably connected with the reinforced three-dimensional drainage net pad through a fixing piece. The emergency disposal structure can effectively solve the problems that the stability of the dam body is affected and / or the seepage guide effect is limited in an existing emergency disposal structure for preventing seepage damage of the earth and rockfill dam.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy project construction, in particular to an emergency disposal device for preventing seepage failure of earth-rock dams. Background Technique

[0002] Reservoir projects store a large amount of water all year round. Each hydrological year faces large fluctuations in water levels. Especially during the flood season, the water levels are high. At this time, there is a large water head difference between the inside and outside of the dam, and the dam body is subjected to a great water pressure. At this time, the stability of the dam body and the safety of the structure are crucial for the normal operation of the reservoir. Especially for earth-rock dams, since the dam body is mainly composed of loose materials, it is not only subjected to a strong reservoir water pressure, but also a large seepage pressure will be generated inside the dam body under the action of a large water head difference. When the phreatic line in the dam body is high and the hydraulic gradient is greater than the allowable gradient of the dam body material, piping or soil flow and other seepage failures will occur in the earth-rock dam, thus endangering the stability and safety of the dam.

[0003] At present, there are 98,000 reservoirs in the country, 90% of which are earth-rock dams. When operating at high water levels, the high phreatic line in the downstream dam area causes seepage failures such as piping and soil flow, which is an important reason endangering the stability of the dam and is also the main problem to be addressed in the emergency rescue of reservoir dams over the years. When operating at high water levels, once the downstream slope of the earth-rock dam shows signs of seepage water infiltration on the slope surface, emergency rescue measures can be taken to prevent seepage failure. Among them, guiding seepage through the downstream dam area to lower the phreatic line is a commonly used emergency rescue method. This method is mainly divided into 3 categories. The specific methods, advantages and disadvantages are as follows:

[0004] 1. Excavate a seepage guiding ditch in the seepage infiltration area of the downstream dam slope to drain the seepage water. The depth and width should be determined according to the seepage situation, generally 0.5 - 1 meter. Anti-seepage materials are laid in the seepage guiding ditch to prevent soil particles from being carried out. This method is simple in construction and low in cost; however, the stability of the dam body may be affected during the excavation process, and the seepage guiding depth is limited, resulting in limited reduction of the phreatic line.

[0005] 2. Set up relief wells downstream of the dam to reduce the seepage pressure inside the dam body. Filter pipes are installed in the wells, and anti-seepage materials are filled around. This method can effectively reduce the seepage pressure and prevent seepage failure; however, hole collapse may occur during the well completion process, thus affecting the stability of the dam body, and the construction difficulty is large and the cost is high.

[0006] 3. Lay an anti-seepage layer in the seepage infiltration area of the downstream dam slope, which can prevent soil particles from being carried out by the seepage water and protect the stability of the dam slope. This method is simple in construction and low in cost; however, it can basically not reduce the phreatic line inside the dam body, and the seepage guiding effect is limited. Content of the Utility Model

[0007] The utility model provides an emergency disposal device for preventing seepage failure of an earth-rock dam, so as to solve the problems that the existing emergency disposal structure for preventing seepage failure of an earth-rock dam affects the stability of the dam body and / or has limited seepage guiding effect.

[0008] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0009] An emergency disposal device for preventing seepage failure of an earth-rock dam includes a plurality of spiral drain pipes and a reinforced three-dimensional drainage geomat; a pointed conical anchor head is arranged at the head of the spiral drain pipe, spiral wings and a plurality of water inlet holes are arranged on the outer peripheral surface, and a connector is arranged at the tail, and the connector is detachably connected with the reinforced three-dimensional drainage geomat through a fixing member.

[0010] Further, the spiral drain pipe includes a head pipe, a plurality of intermediate pipes and a tail pipe which are detachably connected in sequence; the pointed conical anchor head is located at the front end of the head pipe, and the connector is located at the rear end of the tail pipe; the spiral wings are arranged on the outer peripheral surfaces of the head pipe, the intermediate pipes and the tail pipe at equal pitches, and a plurality of water inlet holes are uniformly arranged on the head pipe and the intermediate pipes.

[0011] Further, the head pipe is threadedly connected with the intermediate pipe at the frontmost end, adjacent intermediate pipes are threadedly connected, and the intermediate pipe at the rearmost end is threadedly connected with the tail pipe.

[0012] Further, an external thread connection portion is arranged at the rear end of the head pipe, an internal thread connection portion is arranged at the front end of the intermediate pipe, and an external thread connection portion is arranged at the rear end; an internal thread connection portion is arranged at the front end of the tail pipe; the external thread connection portion of the head pipe is threadedly connected with the internal thread connection portion of the intermediate pipe at the frontmost end, and adjacent intermediate pipes are detachably connected through the external thread connection portion and the internal thread connection portion, and the external thread connection portion of the intermediate pipe at the rearmost end is threadedly connected with the internal thread connection portion of the tail pipe.

[0013] Further, the reinforced three-dimensional drainage geomat is provided with a perforation for the connector to pass through, the connector is of an external thread structure, the fixing member includes a nut and a bearing plate, the bearing plate is sleeved on the connector, the nut is threadedly connected with the connector, and the reinforced three-dimensional drainage geomat is located between the nut and the bearing plate.

[0014] Further, the bearing plate is provided with a matching hole and is movably sleeved on the connector through the matching hole, and the diameter of the matching hole is smaller than the diameter of the pipe body of the spiral drain pipe.

[0015] Further, a filter screen is arranged at the end water outlet of the tail pipe.

[0016] Further, the material of the spiral drain pipe is steel.

[0017] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0018] 1. The utility model can significantly reduce the infiltration line of the downstream dam area by drilling the spiral drainage pipe into the earth-rock dam to a certain depth, thus creating good conditions for preventing seepage damage.

[0019] 2. Due to the squeezing effect of the spiral drainage pipe, the utility model can compact the earth-rock dam materials within the depth range of the drainage pipe, thereby improving the mechanical parameters of the dam body and increasing the stability of the dam.

[0020] 3. Since the spiral drainage pipe of the utility model is made of steel pipe, it has a certain strength. The tail is used in conjunction with the reinforced three-dimensional drainage mesh pad, which has the effect of hanging mesh reinforcement for the dam body, has a certain reinforcement effect, and is beneficial to the stability of the dam body.

[0021] 4. The utility model will not create an open surface during the construction process, and will not have an adverse effect on the temporary and permanent stability of the dam body.

[0022] 5. Since the middle pipe of the spiral drain pipe of the present invention is provided with multiple sections, it is flexible in use. The total length of the drain pipe can be adjusted by adjusting the number of the middle pipe sections according to actual conditions.

[0023] 6. The construction machinery used in the construction of the utility model is simple, versatile, economical, fast to construct, and short in construction period, and is effective as an emergency rescue plan for earth-rock dams. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the application of the emergency disposal device proposed in the utility model;

[0025] Figure 2 This is a schematic diagram of the head pipe structure of the spiral drain pipe proposed in the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the middle pipe of the spiral drain pipe proposed in the present invention;

[0027] Figure 4 This is a schematic diagram of the tail pipe structure of the spiral drain pipe proposed in the present invention;

[0028] Figure 5 This is a schematic diagram of the location of the water filter proposed in this utility model;

[0029] Among them, the labels in the attached drawings are: 1 - water level line, 2 - upstream dam slope, 3 - downstream dam slope, 4 - spiral drain pipe, 5 - reinforced three-dimensional drainage geonet, 6 - head pipe, 7 - tapered anchor head, 8 - spiral wing, 9 - water inlet hole, 10 - external thread connection part of the head pipe, 11 - intermediate pipe, 12 - internal thread connection part of the intermediate pipe, 13 - external thread connection part of the intermediate pipe, 14 - tail pipe, 15 - internal thread connection part of the tail pipe, 16 - connector, 17 - bearing plate, 18 - nut, 19 - filter net. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment

[0032] As Figures 1-5 shown, an emergency disposal device for preventing seepage failure of earth-rock dams includes a plurality of spiral drain pipes 4 and a reinforced three-dimensional drainage geonet 5. The material of the spiral drain pipe 4 is steel. A tapered anchor head 7 is provided at the head of the spiral drain pipe 4, spiral wings 8 and a plurality of water inlet holes 9 are provided on the outer peripheral surface, and a connector 16 is provided at the tail. The connector 16 is detachably connected to the reinforced three-dimensional drainage geonet 5 through a fixing member.

[0033] When the emergency disposal device is applied to an earth-rock dam, a plurality of spiral drain pipes 4 are sequentially screwed and twisted into the dam by an anchor drill and arranged at intervals. The reinforced three-dimensional drainage geonet 5 is laid on the slope of the downstream dam slope 3. The relative fixation between the spiral drain pipe 4 and the reinforced three-dimensional drainage geonet 5 is realized through a fixing member, and the reinforced three-dimensional drainage geonet 5 is tightly pressed on the slope, having good stability. The seepage water in the dam enters the spiral drain pipe 4 through the water inlet holes 9 and is discharged through the water outlet of the spiral drain pipe 4, having good seepage guiding effect.

[0034] Among them, the spiral drain pipe 4 includes a head pipe 6, a plurality of intermediate pipes 11 and a tail pipe 14 that are detachably connected in sequence. The tapered anchor head 7 is located at the front end of the head pipe 6, and the connector 16 is located at the rear end of the tail pipe 14. The spiral wings 8 are arranged at equal pitches on the outer peripheral surfaces of the head pipe 6, the intermediate pipes 11 and the tail pipe 14, and a plurality of water inlet holes 9 are evenly arranged on the head pipe 6 and the intermediate pipes 11. Specifically, the head pipe 6 is threadedly connected to the intermediate pipe 11 at the forefront, the adjacent two intermediate pipes 11 are threadedly connected, and the intermediate pipe 11 at the rearmost is threadedly connected to the tail pipe 14.

[0035] In this embodiment, an external thread connecting portion 10 is provided at the rear end of the head pipe 6, an internal thread connecting portion 12 is provided at the front end of the intermediate pipe 11, an external thread connecting portion 13 is provided at the rear end of the intermediate pipe 11, and an internal thread connecting portion 15 is provided at the front end of the tail pipe 14. The external thread connecting portion 10 of the head pipe is threadedly connected to the internal thread connecting portion 12 of the foremost intermediate pipe, and two adjacent intermediate pipes 11 are detachably connected through the external thread connecting portion 13 and the internal thread connecting portion 12, and the external thread connecting portion 13 of the rearmost intermediate pipe is threadedly connected to the internal thread connecting portion 15 of the tail pipe.

[0036] The reinforced three-dimensional drainage geonet 5 is provided with a perforation for the connector 16 to pass through. The connector 16 has an external thread structure. The fixing member includes a nut 18 and a bearing plate 17. The bearing plate 17 is sleeved on the connector 16, and the nut 18 is threadedly connected to the connector 16. The reinforced three-dimensional drainage geonet 5 is located between the nut 18 and the bearing plate 17. In this embodiment, the bearing plate 17 is provided with a mating hole and is movably sleeved on the connector 16 through the mating hole. The diameter of the mating hole is smaller than the diameter of the pipe body of the spiral drain pipe.

[0037] In addition, a filter net 19 is provided at the end water outlet of the tail pipe 14. The filter net 19 can be a three-dimensional filter net wrapped with geotextile, which can prevent the loss of soil particles while discharging the seepage water in the dam.

[0038] The specific construction method of the present utility model is as follows:

[0039] (1) The anchor drill is in place;

[0040] (2) The power rod of the drill is threadedly connected to the external thread connecting portion 10 of the head pipe through a universal connector;

[0041] (3) The head pipe 6 is twisted into the soil body by spinning;

[0042] (4) The head pipe 6 is separated from the power rod of the drill;

[0043] (5) According to the above steps, several intermediate pipes 11 are successively twisted into the soil body by spinning, and the front and rear pipes are threadedly connected together;

[0044] (6) According to the above steps, the tail pipe 14 is twisted into the soil body by spinning, and the front and rear pipes are threadedly connected together;

[0045] (7) Install the reinforced three-dimensional drainage geonet 5 on the slope;

[0046] (8) Fix the reinforced three-dimensional drainage geonet 5 on the slope through the bearing plate 17 and the nut 18.

[0047] Since the spiral drain pipe 4 of the utility model is drilled into the earth-rock dam to a certain depth, the phreatic line in the downstream dam area can be greatly reduced, creating good conditions for preventing seepage failure. Due to the squeezing effect of the spiral drain pipe 4, the earth-rock dam materials within the depth range of the drain pipe will be compacted, thereby improving the mechanical parameters of the dam body and increasing the stability of the dam. Since the spiral drain pipe 4 is made of steel pipe and has a certain strength, and its tail is used in cooperation with the reinforced three-dimensional drainage geonet 5, it has the effect of hanging net and reinforcing for the dam body, has a certain strengthening effect, and is beneficial to the stability of the dam body. Since the intermediate pipe 11 of the spiral drain pipe 4 is provided with multiple sections, it has flexibility in use. According to the actual situation, the total length of the drain pipe can be adjusted by adjusting the number of sections of the intermediate pipe 11.

[0048] During the construction process of the utility model, no free face will be formed, and it will not have an adverse impact on the temporary and permanent stability of the dam body. The construction machinery used in construction is simple, has strong versatility, good economy, fast construction speed, and short construction period, and has a good effect as an emergency rescue plan for earth-rock dams.

[0049] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the patent application scope of the utility model. Any equivalent changes or modified changes completed under the technical spirit prompted by the utility model shall fall within the patent scope covered by the utility model.

Claims

1. An emergency disposal device for preventing seepage failure of an earth-rock dam, characterized in that: It includes several spiral drain pipes and a reinforced three-dimensional drainage geomat; a tapered anchor head is arranged at the head of the spiral drain pipe, spiral wings and several water inlet holes are arranged on the outer peripheral surface, and a connector is arranged at the tail, and the connector is detachably connected to the reinforced three-dimensional drainage geomat through a fixing member.

2. The emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 1, characterized in that: The spiral drain pipe includes a head pipe, several intermediate pipes and a tail pipe which are detachably connected in sequence; the tapered anchor head is located at the front end of the head pipe, and the connector is located at the rear end of the tail pipe; the spiral wings are arranged on the outer peripheral surfaces of the head pipe, the intermediate pipes and the tail pipe at equal pitches, and several water inlet holes are evenly arranged on the head pipe and the intermediate pipes.

3. The emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 2, characterized in that: The head pipe is threadedly connected to the intermediate pipe at the frontmost end, and adjacent intermediate pipes are threadedly connected, and the intermediate pipe at the rearmost end is threadedly connected to the tail pipe.

4. An emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 3, characterized in that: An external thread connecting portion of the head pipe is arranged at the rear end of the head pipe, an internal thread connecting portion of the intermediate pipe is arranged at the front end of the intermediate pipe, and an external thread connecting portion of the intermediate pipe is arranged at the rear end of the intermediate pipe. An internal thread connecting portion of the tail pipe is arranged at the front end of the tail pipe; the external thread connecting portion of the head pipe is threadedly connected to the internal thread connecting portion of the intermediate pipe at the frontmost end, and adjacent intermediate pipes are detachably connected through the external thread connecting portion and the internal thread connecting portion of the intermediate pipe, and the external thread connecting portion of the intermediate pipe at the rearmost end is threadedly connected to the internal thread connecting portion of the tail pipe.

5. An emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 4, characterized in that: The reinforced three-dimensional drainage geomat is provided with a perforation for the connector to pass through. The connector has an external thread structure. The fixing member includes a nut and a bearing plate. The bearing plate is sleeved on the connector, the nut is threadedly connected to the connector, and the reinforced three-dimensional drainage geomat is located between the nut and the bearing plate.

6. The emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 5, characterized in that: The bearing plate is provided with a fitting hole and is movably sleeved on the connector through the fitting hole. The diameter of the fitting hole is smaller than the diameter of the pipe body of the spiral drain pipe.

7. An emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 2, characterized in that: A filter screen is arranged at the end water outlet of the tail pipe.

8. An emergency disposal device for preventing seepage failure of an earth-rock dam according to claim 1, characterized in that: The material of the spiral drain pipe is steel.

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