Concrete face rockfill dam filling treatment system and construction method

Abstract

The application discloses a concrete face rockfill dam filling treatment system and a construction method, wherein the concrete face rockfill dam filling treatment system comprises a water supply pipe and a water filling assembly; the water supply pipe is fixedly arranged on the top of a dam body; a plurality of groups of the water filling assembly are arranged in the vertical direction in the dam body; the water filling assembly comprises a connecting pipe and a water filling pipeline; the axis of the connecting pipe is arranged in the vertical direction; a vertical pipe is arranged in communication between the connecting pipes of the upper and lower adjacent water filling assemblies; the water filling pipeline comprises a flow guide pipe and a water filling pipe; a through hole is arranged at intervals in the radial side wall of the water filling pipe; one end of the water filling pipe is closed; the other end is fixedly connected with one end of the flow guide pipe; the other end of the flow guide pipe is in communication with the connecting pipe; and the top of the connecting pipe of the uppermost water filling assembly is in communication with the water supply pipe. Through the above arrangement, the filler of the dam body can be uniformly watered.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically relating to a concrete-faced rockfill dam filling treatment system and construction method. Background Technology

[0002] Pumped storage power stations are key projects in the national plan. Many pumped storage power stations are designed with concrete-faced rockfill dams. The dam filling process accounts for a large proportion of the total construction period of the power station. In order to shorten the construction period of the power station, it is necessary to achieve rapid construction of the dam filling. During the construction process, the dam filling project needs to be filled in layers, including the foundation layer, transition zone, and rockfill zone. Moreover, before the dam face is constructed, the maximum settlement rate of the dam body is required to be less than 5 mm / month.

[0003] Although the fill material is compacted using rollers and water is sprayed on its surface during layered filling, the lower layer of fill material continues to settle under the weight of the upper layer, making it difficult to control the maximum settlement rate of the dam within the specified range during the planned settlement period. To address this issue, in actual construction, water pipes are typically laid on the top surface of the dam, with sprinkler heads connected to the radial sidewalls of the pipes. This continuous water spraying allows moisture to penetrate, reducing friction between the fill material and causing it to rearrange under gravity, quickly forming a denser structure.

[0004] The vertical cross-section of the dam is trapezoidal. When water is sprayed only on the top surface of the dam, the water is difficult to penetrate into the fill material below the dam slope, which can easily lead to uneven settlement of the dam, increase the possibility of cracks, cause leakage, weaken the overall integrity of the dam, and reduce its shear and sliding resistance. Summary of the Invention

[0005] The present invention aims to provide a concrete-faced rockfill dam filling treatment system and construction method to alleviate the problem of uneven settlement that exists in the above-mentioned solutions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A concrete-faced rockfill dam filling treatment system, installed in the dam body, includes a water supply pipe and an irrigation assembly. The water supply pipe is fixedly installed at the top of the dam body. Multiple sets of irrigation assemblies are vertically installed within the dam body. Each irrigation assembly includes a connecting pipe and an irrigation pipeline. The axis of the connecting pipe is arranged vertically, and vertical pipes are connected between the connecting pipes of adjacent irrigation assemblies. The irrigation pipeline includes a diversion pipe and an irrigation pipe. Through holes are spaced apart on the radial sidewall of the irrigation pipe. One end of the irrigation pipe is closed, and the other end is fixedly connected to one end of the diversion pipe. The other end of the diversion pipe is connected to the connecting pipe. The top of the connecting pipe of the uppermost irrigation assembly is connected to the water supply pipe.

[0007] In this invention, the radial sidewall of the connecting pipe has an opening, and the outer radial sidewall of the connecting pipe has a connecting section integrally formed around the outer circumference of the opening. The water filling assembly also includes a guide tube, which is movably inserted into the top of the connecting pipe, and the top of the outer sidewall of the guide tube is threadedly connected to the top of the inner sidewall of the connecting pipe. A partition is fixedly installed inside the guide tube, and an arc-shaped baffle is fixedly installed on the top of the partition. A through groove is provided on one side of the partition. A water passage hole is provided on the radial sidewall of the guide tube on the side of the arc-shaped baffle away from the through groove.

[0008] In this invention, the top of the baffle is provided with a notch, and a receiving plate is movably arranged inside the guide tube. The receiving plate has a guide hole that runs vertically through it along its axial direction. The axial projection of the guide hole along the connecting pipe is located outside the axial projection of the through groove along the connecting pipe.

[0009] In this invention, the vertical projection of the axis of the irrigation pipe of the irrigation assembly in the 3N-1 group from bottom to top forms an angle α with the vertical projection of the axis of the irrigation pipe of the irrigation assembly on its upper and lower sides, which is set to 15°<α≤45°, and N is a natural number greater than or equal to 1.

[0010] In this invention, the distance between one end of each irrigation pipe and the slope surface of the dam body is equal, and the vertical projections of each irrigation pipe located on the same vertical plane do not overlap.

[0011] In this invention, the dam body is provided with grooves at intervals, the irrigation pipeline is provided in the corresponding groove, and the gap between the inner wall of the groove and the irrigation pipeline is filled with a layer of sand and gravel.

[0012] In this invention, flexible joints are provided between the irrigation pipe and the adjacent diversion pipe, between the diversion pipe and the corresponding connecting section, and between the connecting pipe and the adjacent vertical pipe below.

[0013] In this invention, the connecting pipe includes a first pipe section and a second pipe section, the opening is formed on the radial sidewall of the first pipe section, the second pipe section is located below the first pipe section, and the inner diameter of the second pipe section is smaller than the inner diameter of the first pipe section.

[0014] In this invention, a pulse nozzle is provided between the radial sidewall of the water supply pipe and two adjacent water irrigation components.

[0015] A construction method relating to a concrete-faced rockfill dam backfill treatment system includes the following steps: S1: Spread the fill material on the foundation, then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate a trench on its surface, and then fill the trench with a layer of sand and gravel. S2: Place the irrigation pipe and the diversion pipe in the trench, and install a flexible joint between the irrigation pipe and the diversion pipe so that the flexible joint is connected to the irrigation pipe and the diversion pipe respectively. Place the connecting flexible joint and the connecting pipe in sequence at the other end of the diversion pipe. Insert the diversion cylinder into the connecting pipe and thread the top of the diversion cylinder to the connecting pipe until the bottom of the diversion cylinder abuts against the radial inner wall of the connecting pipe. The axial projection of the water passage along the connecting section is located within the axial projection of the opening along the connecting section. Place the receiving plate in the diversion cylinder and the baffle provides support for the receiving plate. Install the vertical pipe on the top of the connecting pipe and install the flexible joint on the top of the vertical pipe. Seal the top of the flexible joint. S3: Spread the fill material again on the compacted fill material, and then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate a trench on its surface, then fill the trench with a layer of sand and gravel, and excavate and open the flexible joint installed at the top of the vertical pipe. S4: Repeat S2 and S3 until the top surface of the packing reaches the design height; S5: Lay a water supply pipe on the top of the dam body and connect the water supply pipe to the connecting pipe of the uppermost water injection component; S6: Water is supplied to the water supply pipe. The water flowing through the pulse nozzle is sprayed onto the surface of the dam body and flows into the uppermost connecting pipe. The water first falls onto the top surface of the receiving plate, then flows along the guide hole into the cavity surrounded by the inner wall of the guide cylinder, the partition and the baffle, and flows along the water passage into the guide pipe, and finally flows out through the irrigation pipe and the through hole. When the water in the cavity overflows the gap, the water flows through the gap and the through groove into the connecting pipe of the adjacent irrigation component below.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By burying irrigation pipes inside the dam body, water can be continuously replenished to the fill material below the dam slope, thus mitigating uneven settlement of the dam body.

[0017] 2. By ensuring that the vertical projections of the irrigation pipes located on the same vertical plane do not overlap, it is possible to avoid repeated irrigation of the fill material at the bottom, thereby improving the uniformity of irrigation of the dam fill material.

[0018] 3. By making the vertical projections of the irrigation pipes of adjacent irrigation components form an angle, the working area of ​​the irrigation components can be increased.

[0019] 4. Flexible joints are installed between the irrigation pipe and the diversion pipe, between the diversion pipe and the connecting pipe, and between the connecting pipe and the adjacent vertical pipe below, so as to avoid damage to the irrigation components when the dam body settles.

[0020] 5. The use of sand and gravel layers in trenches can protect the structural safety of irrigation and diversion pipes, ensure uniform load distribution, and prevent sharp stones from directly squeezing or scratching the irrigation and diversion pipes. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a schematic diagram of the arrangement of multiple irrigation components according to the present invention; Figure 3 This is a partial enlarged view of the water-filling component of the present invention; Figure 4 This is a cross-sectional view of the connecting pipe of the present invention; Figure 5 This is a partial enlarged view of the top of the dam body of the present invention; Figure 6 This is a top view of the multiple irrigation components of the present invention. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: The reference numerals in the accompanying drawings include: 10, dam body; 11, trench; 20, water supply pipe; 30, connecting pipe; 31, first pipe section; 32, second pipe section; 33, connecting section; 40, irrigation pipeline; 41, irrigation conduit; 411, through hole; 42, diversion pipe; 50, diversion tube; 51, baffle plate; 52, barrier plate; 521, notch; 53, through groove; 54, water passage hole; 55, receiving plate; 551, diversion hole; 60, vertical pipe; 70, flexible joint; 80, pulse sprinkler head.

[0023] Example: As attached Figure 1-6 As shown, this invention discloses a concrete-faced rockfill dam filling treatment system, installed in the dam body 10, including a water supply pipe 20 and a water injection assembly. The water supply pipe 20 is fixedly installed at the top of the dam body 10. Multiple sets of water injection assemblies are vertically arranged inside the dam body 10. Each water injection assembly includes a connecting pipe 30 and a water injection pipeline 40. The axis of the connecting pipe 30 is arranged vertically. A vertical pipe 60 is connected between the connecting pipes 30 of adjacent water injection assemblies. The water injection pipeline 40 includes a diversion pipe 42 and a water injection pipe 41. Through holes 411 are spaced apart on the radial sidewall of the water injection pipe 41. One end of the water injection pipe 41 is closed, and the other end is fixedly connected to one end of the diversion pipe 42. The other end of the diversion pipe 42 is connected to the connecting pipe 30. The top of the connecting pipe 30 of the uppermost water injection assembly is connected to the water supply pipe 20.

[0024] In this embodiment, the radial sidewall of the connecting pipe 30 has an opening, and the outer radial sidewall of the connecting pipe 30 is integrally formed with a connecting section 33 around the outer circumference of the opening. The water filling assembly also includes a guide tube 50, which is movably inserted into the top of the connecting pipe 30, and the top of the outer sidewall of the guide tube 50 is threadedly connected to the top of the inner sidewall of the connecting pipe 30. A partition 51 is fixedly installed inside the guide tube 50, and an arc-shaped baffle 52 is fixedly installed on the top of the partition 51. A through groove 53 is provided on one side of the baffle 52 of the partition 51. A water passage hole 54 is provided on the radial sidewall of the guide tube 50 on the side of the arc-shaped plate away from the through groove 53.

[0025] In this embodiment, the top of the baffle 52 is provided with a notch 521, and a receiving plate 55 is movably disposed inside the guide tube 50. The receiving plate 55 has a guide hole 551 that runs vertically through it along its axial direction. The guide hole 551 is projected along the axial direction of the connecting pipe 30 and is located outside the through groove 53 along the axial direction of the connecting pipe 30.

[0026] In this embodiment, the vertical projection of the axis of the irrigation pipe 40 of the irrigation assembly in the 3N-1 group from bottom to top forms an angle α with the vertical projection of the axis of the irrigation pipe 40 of the adjacent irrigation assemblies on its upper and lower sides. This angle is set to 15° < α ≤ 45°, where N is a natural number greater than or equal to 1. (See attached diagram.) Figure 2 and appendix Figure 6 As described above, the second group of water-irrigating components from bottom to top in the figure is group (3×1-1), and the fifth group of water-irrigating components is group (3×2-1). Taking the second group of water-irrigating components as the reference, the vertical projection of the axis of the water-irrigating pipe 40 of the first group of water-irrigating components forms an angle with the vertical projection of the axis of the water-irrigating pipe 40 of the second group of water-irrigating components, and the vertical projection of the axis of the water-irrigating pipe 40 of the third group of water-irrigating components forms an angle with the vertical projection of the axis of the water-irrigating pipe 40 of the second group of water-irrigating components. The first group of water-irrigating components and the third group of water-irrigating components are located on both sides of the second group of water-irrigating components. The first group of water-irrigating components and the fourth group of water-irrigating components are located in the same vertical plane, the second group of water-irrigating components and the fifth group of water-irrigating components are located in the same vertical plane, and the third group of water-irrigating components and the sixth group of water-irrigating components are located in the same vertical plane.

[0027] In this embodiment, the distance between one end of each irrigation pipe 41 and the slope surface of the dam body 10 is equal, and the vertical projections of each irrigation pipe 41 located on the same vertical plane do not overlap, as shown in the attached figure. Figure 1 As shown, the first group of water-irrigating components, the fourth group of water-irrigating components, and the seventh group of water-irrigating components from bottom to top are located on the same vertical plane, and the vertical projection of the water-irrigating pipe 41 of the seventh group of water-irrigating components is located within the vertical projection of the guide pipe 42 of the fourth group of water-irrigating components.

[0028] In this embodiment, the dam body 10 is provided with grooves 11 at intervals, and the irrigation pipeline 40 is provided in the corresponding groove 11. The gap between the inner sidewall of the groove 11 and the irrigation pipeline 40 is filled with a layer of sand and gravel.

[0029] In this embodiment, flexible joints 70 are provided between the irrigation pipe 41 and the adjacent diversion pipe 42, between the diversion pipe 42 and the corresponding connecting section 33, and between the connecting pipe 30 and the adjacent vertical pipe 60 below.

[0030] In this embodiment, the connecting pipe 30 includes a first pipe section 31 and a second pipe section 32. The opening is formed on the radial sidewall of the first pipe section 31. The second pipe section 32 is located below the first pipe section 31, and the inner diameter of the second pipe section 32 is smaller than the inner diameter of the first pipe section 31.

[0031] In this embodiment, a pulse nozzle 80 is provided in communication between the radial sidewall of the water supply pipe 20 and two adjacent water irrigation components.

[0032] In this embodiment, a blind ditch is provided at the bottom of the dam body 10, with the lower end of the blind ditch extending to the outside of the backwater side of the dam body 10.

[0033] In this embodiment, a settlement slope is provided at the top of the dam body 10.

[0034] The specific implementation process is as follows: S1: Spread the fill material on the foundation, and then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate the trench 11 on its surface, and then fill the trench 11 with a layer of sand and gravel. S2: Place the irrigation pipe 41 and the diversion pipe 42 in the trench 11, and set a flexible joint 70 between the irrigation pipe 41 and the diversion pipe 42 so that the flexible joint 70 is connected to the irrigation pipe 41 and the diversion pipe 42 respectively. Place the connecting flexible joint 70 and the connecting pipe 30 in sequence at the other end of the diversion pipe 42. Insert the diversion cylinder 50 into the connecting pipe 30 and thread the top of the diversion cylinder 50 to the connecting pipe 30 until the bottom of the diversion cylinder 50 abuts against the radial inner side wall of the connecting pipe 30. The water passage hole 54 is located in the axial projection of the opening along the axial projection of the connecting section 33. Place the receiving plate 55 in the diversion cylinder 50. The baffle plate 52 provides support for the receiving plate 55. Install the vertical pipe 60 on the top of the connecting pipe 30 and install the flexible joint 70 on the top of the vertical pipe 60. Seal the top of the flexible joint 70. S3: Spread the fill material again on the compacted fill material, and then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate the trench 11 on its surface, and then fill the trench 11 with a layer of sand and gravel. Excavate and open the flexible joint 70 installed on the top of the vertical pipe 60. S4: Repeat S2 and S3 until the top surface of the packing reaches the design height; S5: Lay a water supply pipe 20 on the top of the dam body 10 and connect the water supply pipe 20 to the connecting pipe 30 of the uppermost water injection component; S6: Water is supplied to the water supply pipe 20. The water flowing through the pulse nozzle 80 is sprayed onto the surface of the dam body 10 and flows into the uppermost connecting pipe 30. The water first falls onto the top surface of the receiving plate 55, then flows along the guide hole 551 into the cavity surrounded by the inner wall of the guide cylinder 50, the partition plate 51 and the baffle plate 52, and flows along the water passage hole 54 into the guide pipe 42, and finally flows out through the irrigation pipe 41 and the through hole 411. When the water in the cavity overflows the gap 521, the water flows through the gap 521 and the through groove 53 into the connecting pipe 30 of the adjacent irrigation component below.

[0035] The parts of the device not covered herein are the same as or can be implemented using existing technologies.

[0036] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific technical solutions or characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A concrete-faced rockfill dam filling treatment system, installed in the dam body, characterized in that, include: A water supply pipe, which is fixedly installed on the top of the dam body; The irrigation assembly comprises multiple sets arranged vertically within the dam body. Each irrigation assembly includes a connecting pipe and an irrigation pipeline. The connecting pipe is arranged vertically along its axis, and vertical pipes are connected between the connecting pipes of adjacent irrigation assemblies. The irrigation pipeline includes a diversion pipe and an irrigation pipe. Through holes are spaced apart on the radial sidewall of the irrigation pipe. One end of the irrigation pipe is closed, and the other end is fixedly connected to one end of the diversion pipe. The other end of the diversion pipe is connected to the connecting pipe. The top of the connecting pipe of the uppermost irrigation assembly is connected to the water supply pipe.

2. The concrete-faced rockfill dam filling treatment system as described in claim 1, characterized in that: The connecting pipe has an opening on its radial sidewall, and a connecting section is integrally formed on the outer circumference of the radial outer sidewall of the connecting pipe around the opening. The water filling assembly also includes a guide tube, which is movably inserted into the top of the connecting pipe, and the top of the outer sidewall of the guide tube is threadedly connected to the top of the inner sidewall of the connecting pipe. A partition is fixedly installed inside the guide tube, and an arc-shaped baffle is fixedly installed on the top of the partition. A through groove is provided on one side of the partition. A water passage hole is provided on the radial sidewall of the guide tube on the side of the arc-shaped baffle away from the through groove.

3. The concrete-faced rockfill dam filling treatment system as described in claim 2, characterized in that: The top of the baffle is provided with a notch, and a receiving plate is movably arranged inside the guide tube. The receiving plate has a guide hole that runs vertically through it along its axial direction. The axial projection of the guide hole along the connecting pipe is located outside the axial projection of the through groove along the connecting pipe.

4. The concrete-faced rockfill dam filling treatment system as described in claim 3, characterized in that: The vertical projection of the axis of the irrigation pipe of the irrigation component in the 3N-1 group from bottom to top forms an angle α with the vertical projection of the axis of the irrigation pipe of the irrigation component on its upper and lower sides. The angle α is set to 15°<α≤45°, and N is a natural number greater than or equal to 1.

5. The concrete-faced rockfill dam filling treatment system as described in claim 4, characterized in that: The distance between one end of each irrigation pipe and the slope surface of the dam body is equal, and the vertical projections of each irrigation pipe located on the same vertical plane do not overlap.

6. The concrete-faced rockfill dam filling treatment system as described in claim 5, characterized in that: The dam body is provided with grooves at intervals, and the irrigation pipeline is installed in the corresponding groove. The gap between the inner wall of the groove and the irrigation pipeline is filled with a layer of sand and gravel.

7. The concrete-faced rockfill dam filling treatment system as described in claim 6, characterized in that: Flexible joints are provided between the irrigation pipe and the adjacent diversion pipe, between the diversion pipe and the corresponding connecting section, and between the connecting pipe and the adjacent vertical pipe below.

8. The concrete-faced rockfill dam filling treatment system as described in claim 7, characterized in that: The connecting pipe includes a first pipe section and a second pipe section. The opening is formed on the radial sidewall of the first pipe section. The second pipe section is located below the first pipe section, and the inner diameter of the second pipe section is smaller than the inner diameter of the first pipe section.

9. The concrete-faced rockfill dam filling treatment system as described in claim 8, characterized in that: The radial sidewall of the water supply pipe is connected to two adjacent water irrigation components and is equipped with pulse nozzles.

10. A construction method, based on the concrete-faced rockfill dam filling treatment system of claim 9, characterized in that, Includes the following steps: S1: Spread the fill material on the foundation, then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate a trench on its surface, and then fill the trench with a layer of sand and gravel. S2: Place the irrigation pipe and the diversion pipe in the trench, and install a flexible joint between the irrigation pipe and the diversion pipe so that the flexible joint is connected to the irrigation pipe and the diversion pipe respectively. Place the connecting flexible joint and the connecting pipe in sequence at the other end of the diversion pipe. Insert the diversion cylinder into the connecting pipe and thread the top of the diversion cylinder to the connecting pipe until the bottom of the diversion cylinder abuts against the radial inner wall of the connecting pipe. The axial projection of the water passage along the connecting section is located within the axial projection of the opening along the connecting section. Place the receiving plate in the diversion cylinder and the baffle provides support for the receiving plate. Install the vertical pipe on the top of the connecting pipe and install the flexible joint on the top of the vertical pipe. Seal the top of the flexible joint. S3: Spread the fill material again on the compacted fill material, and then roll the fill material multiple times. When the fill material meets the compaction coefficient specified in the design, excavate a trench on its surface, then fill the trench with a layer of sand and gravel, and excavate and open the flexible joint installed at the top of the vertical pipe. S4: Repeat S2 and S3 until the top surface of the packing reaches the design height; S5: Lay a water supply pipe on the top of the dam body and connect the water supply pipe to the connecting pipe of the uppermost water injection component; S6: Water is supplied to the water supply pipe. The water flowing through the pulse nozzle is sprayed onto the surface of the dam body and flows into the uppermost connecting pipe. The water first falls onto the top surface of the receiving plate, then flows along the guide hole into the cavity surrounded by the inner wall of the guide cylinder, the partition and the baffle, and flows along the water passage into the guide pipe, and finally flows out through the irrigation pipe and the through hole. When the water in the cavity overflows the gap, the water flows through the gap and the through groove into the connecting pipe of the adjacent irrigation component below.

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