Impedance type surge shaft structure

Abstract

The utility model discloses an impedance type surge shaft structure which comprises a water delivery tunnel, one side of the water delivery tunnel is communicated with a large surge shaft through a connecting pipe, a connecting section is arranged between the water delivery tunnel and the connecting pipe, and an impedance hole is formed in the connecting section. The impedance hole comprises a first hole channel communicated with the water conveying tunnel and a second hole channel communicated with the connecting pipe, the inner diameter of the first hole channel is smaller than that of the water conveying tunnel, and the inner diameter of the second hole channel is gradually increased in the direction from the water conveying tunnel to the connecting pipe. The construction difficulty and the construction risk are reduced, the impedance holes are formed in the adit section to facilitate formwork erecting and concrete pouring, the connecting pipe vertical shaft can be directly constructed through a sliding formwork, construction safety and convenience are guaranteed, and the defects that a cantilever structure under a high vertical shaft is difficult to construct and large in construction risk are overcome.

Description

Technical Field

[0001] The utility model relates to an impedance-type pressure regulating well structure, belonging to the technical field of water conservancy and hydropower engineering construction. Background Art

[0002] In the design of hydropower stations (pumped storage power stations), when the water delivery system is long, it is necessary to consider setting up a surge tank. Impedance surge tanks are a commonly used surge tank structure due to their simple structure and fast fluctuation attenuation.

[0003] For impedance surge tanks with long connecting pipes, the impedance holes are usually arranged at the connection between the bottom plate of the surge tank and the connecting pipe. This type of structure is often difficult to set up during construction, which is not conducive to the use of slipform construction. The construction difficulty and construction risk of cantilever structures are relatively large.

[0004] Some pressure-regulating wells reduce the diameter of the connecting pipe to the diameter of the impedance hole, and use the connecting pipe also as the impedance hole, avoiding the problem of difficulty in cantilever structure construction. However, for impedance-type pressure-regulating wells with relatively long connecting pipes, the LV value of the connecting pipe cannot be ignored. The reduction in the size of the connecting pipe inevitably increases the inertia of the water flow, which has an adverse effect on the regulation and assurance design of the water delivery system. Utility Model Content

[0005] The utility model aims to provide an impedance hole structure horizontally arranged at the bifurcation of a water conveyance tunnel and a connecting pipe in view of the shortcomings of the existing impedance holes of the long connecting pipe impedance regulating well, such as the difficulty in construction and the great risk in construction.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An impedance-type pressure regulating well structure comprises a water conveyance tunnel, one side of the water conveyance tunnel is connected to a pressure regulating well through a connecting pipe, the water conveyance tunnel and the connecting pipe are connected through a connecting section, an impedance hole is opened inside the connecting section; the impedance hole comprises a first channel connected to the water conveyance tunnel and a second channel connected to the connecting pipe, the inner diameter of the first channel is smaller than the inner diameter of the water conveyance tunnel, and the inner diameter of the second channel gradually increases from the water conveyance tunnel to the connecting pipe.

[0008] Therefore, the utility model arranges the impedance hole structure at the bifurcation of the water conveyance tunnel and the connecting pipe. Compared with the impedance hole arranged at the bottom plate of the surge shaft in the vertical direction of the original axis, the impedance coefficient of the impedance hole and the LV value of the connecting pipe are not affected, and the regulation and protection performance of the power station and the surge in the surge chamber are not adversely affected; at the same time, the construction of the cantilever structure on the high vertical shaft is avoided, reducing the construction difficulty and construction risk.

[0009] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization:

[0010] In a specific embodiment, the connecting pipe includes a vertical section connected to the pressure regulating well and an arc section connected to the water transfer tunnel through the connecting section.

[0011] In a specific embodiment, the inner diameter of the connecting pipe is the same as the inner diameter of the water conveyance tunnel.

[0012] Thus, the inner diameter of the connecting pipe is the same as the inner diameter of the water conveyance tunnel, which facilitates the discharge of gas in the water conveyance tunnel during filling and drainage. When the inner diameter of the water conveyance tunnel is large, the diameter of the connecting pipe is a size that is convenient for construction.

[0013] In a specific embodiment, the impedance hole is arranged horizontally; the inner diameter of the first hole is smaller than the inner diameter of the connecting pipe, one end of the second hole is the same as the inner diameter of the first hole, and the other end of the second hole is the same as the inner diameter of the connecting pipe. The end of the first hole close to the water conveyance tunnel is chamfered. Thus, the impedance hole has better hydraulic and force characteristics.

[0014] In a specific embodiment, a horizontally arranged drainage pipe located below the impedance hole is provided in the connecting section; two ends of the drainage pipe are respectively connected to the water conveyance tunnel and the connecting pipe.

[0015] Therefore, when the water supply system is drained for maintenance, the accumulated water at the bottom of the curved section of the connecting pipe is discharged through the maintenance drain pipe, and the maintenance personnel can enter the connecting pipe for maintenance.

[0016] Specifically, water stop strips are provided between the pressure regulating well and the connecting pipe and between the connecting pipe and the connecting section.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1) The impedance surge tank structure of the utility model is suitable for the impedance hole structure of the impedance surge tank with a long connecting pipe. The impedance hole structure arranged horizontally at the bifurcation of the water conveyance tunnel and the connecting pipe does not affect the impedance coefficient of the impedance hole and the LV value of the connecting pipe, compared with the impedance hole arranged vertically at the bottom plate of the large well, and has no adverse effect on the regulation and protection performance of the power station and the surge in the surge chamber.

[0019] 2) The impedance-type surge tank structure of the utility model avoids the construction of cantilever structures on high vertical shafts, reduces construction difficulty and construction risks, and the impedance holes are arranged in the flat tunnel section to facilitate template erection and concrete pouring. The connecting pipe shaft can be directly constructed using slipforms, ensuring safe and convenient construction. It overcomes the defects of difficult construction and high construction risks of cantilever structures under high vertical shafts, and effectively solves the construction difficulty and construction safety issues of the impedance hole structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the longitudinal section structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the plan section structure of the utility model.

[0022] In the figure

[0023] 1-water conveyance tunnel; 2-impedance hole; 21-first channel; 22-second channel; 3-connecting pipe; 31-vertical section; 32-arc section; 4-pressure regulating well; 5-drainage pipe; 6-water stop; 7-connecting section. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0025] like Figure 1-Figure 2 As shown, the impedance surge tank structure of this embodiment includes a water delivery tunnel 1, one side of the water delivery tunnel 1 is connected to the surge tank 4 through a connecting pipe 3, the connecting pipe 3 includes a vertical section 31 connected to the surge tank 4 and an arc section 32 connected to the water delivery tunnel 1 through the connecting section 7, and the inner diameter of the connecting pipe 3 is the same as the inner diameter of the water delivery tunnel 1. The diameter of the connecting pipe 3 can be the diameter of the water delivery tunnel, and the portion connected to the surge tank 4 is no longer arranged with a cantilever structure.

[0026] A connecting section 7 is provided between the water conveyance tunnel 1 and the connecting pipe 3, and the two are connected through the connecting section 7. An impedance hole 2 is opened inside the connecting section 7; the impedance hole 2 includes a first channel 21 connected to the water conveyance tunnel 1 and a second channel 22 connected to the connecting pipe, the inner diameter of the first channel 21 is smaller than the inner diameter of the water conveyance tunnel 1, and the inner diameter of the second channel 22 gradually increases from the water conveyance tunnel 1 to the connecting pipe 3.

[0027] The impedance hole 2 is arranged horizontally; the inner diameter of the first channel 21 is smaller than the inner diameter of the connecting pipe 3, and the first channel 21 is chamfered at one end close to the water conveyance tunnel 1; the second channel 22 is conical, one end of the second channel 22 is the same as the inner diameter of the first channel 21, and the other end of the second channel 22 is the same as the inner diameter of the connecting pipe 3.

[0028] A horizontally arranged drainage pipe 5 is provided in the connecting section 7 and is located below the impedance hole 2; both ends of the drainage pipe 5 are respectively connected to the water supply tunnel 1 and the connecting pipe 3, and a water stop belt 6 is provided between the pressure regulating well 4 and the connecting pipe 3 and between the connecting pipe 3 and the connecting section 7.

[0029] The impedance hole structure of the present embodiment, which is suitable for a long connecting pipe impedance-type pressure-regulating well, comprises a pressure-regulating well connecting pipe 3 arranged in a "pipe-like" manner and a horizontal impedance hole 2 structure arranged at the bifurcation of the water supply tunnel 1 and the connecting pipe 3; the two ends of the impedance hole 2 are respectively connected to the water supply tunnel 1 and the pressure-regulating well connecting pipe 3, and a maintenance drainage steel pipe is pre-buried at the bottom of the impedance hole 2 to discharge the maintenance water, and a waterstop is arranged between the impedance hole 2 structure and the connecting pipe 3 structure.

[0030] The impedance hole structure of this embodiment is applicable to the impedance type pressure regulating well of the long connecting pipe, see Figure 1 , Figure 2 , including an impedance hole 2 at the junction of the water delivery tunnel and the connecting pipe; the two ends of the impedance hole 2 are respectively connected to the water delivery tunnel 1 and the connecting pipe 3, and a water stop belt 6 is arranged between the impedance hole structure 2 and the connecting pipe 3 to stop water; the connecting pipe 3 is connected to the large well 4 of the pressure regulating chamber; the maintenance drainage pipe 5 is arranged at the bottom of the impedance hole structure 2 and is used for maintenance drainage.

[0031] like Figure 1 , Figure 2 As shown, the axis of the impedance hole structure 2 is arranged horizontally at the junction of the water conveyance tunnel 1 and the connecting pipe 3, and the impedance hole diameter is smaller than the water conveyance tunnel diameter. The connecting pipe 3 can be the water conveyance tunnel diameter, and the cantilever structure is no longer arranged at the junction with the surge chamber well 4.

[0032] like Figure 1 As shown, when the water delivery system is emptied for maintenance, the accumulated water at the bottom of the curved section of the connecting pipe is discharged through the maintenance drain pipe 5, and the maintenance personnel can enter the connecting pipe for maintenance.

[0033] The impedance-type pressure-regulating shaft structure of the present embodiment avoids the construction of a cantilever structure on a high vertical shaft, reduces the construction difficulty and construction risk, and the impedance holes are arranged in the flat tunnel section to facilitate the erection of formwork and concrete pouring. The connecting pipe shaft can be directly constructed using slipforms, ensuring safe and convenient construction. The defects of difficult construction and high construction risks of cantilever structures under high vertical shafts are overcome, and the construction difficulty and construction safety issues of the impedance hole structure are effectively solved.

[0034] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

Claims

1. An impedance-type surge tank structure, comprising a water delivery tunnel (1), one side of the water delivery tunnel (1) being connected to a surge tank (4) via a connecting pipe (3), characterized in that: The water conveyance tunnel (1) and the connecting pipe (3) are connected via a connecting section (7), and an impedance hole (2) is provided inside the connecting section (7); the impedance hole (2) comprises a first hole (21) connected to the water conveyance tunnel (1) and a second hole (22) connected to the connecting pipe (3); the inner diameter of the first hole (21) is smaller than the inner diameter of the water conveyance tunnel (1), and the inner diameter of the second hole (22) gradually increases from the water conveyance tunnel (1) to the connecting pipe (3).

2. The impedance-type surge tank structure according to claim 1, characterized in that: The connecting pipe (3) comprises a vertical section (31) connected to the pressure regulating well (4) and an arc section (32) connected to the water conveyance tunnel (1) via the connecting section (7).

3. The impedance-type surge tank structure according to claim 1, characterized in that: The inner diameter of the connecting pipe (3) is the same as the inner diameter of the water conveyance tunnel (1).

4. The impedance surge tank structure according to any one of claims 1 to 3, characterized in that: The impedance hole (2) is arranged horizontally; the inner diameter of the first hole (21) is smaller than the inner diameter of the connecting tube (3); one end of the second hole (22) has the same inner diameter as the first hole (21); and the other end of the second hole (22) has the same inner diameter as the connecting tube (3).

5. The impedance surge tank structure according to any one of claims 1 to 3, characterized in that: An end of the first hole (21) close to the water conveyance tunnel (1) is chamfered.

6. The impedance-type surge tank structure according to claim 1, characterized in that: A horizontally arranged drainage pipe (5) is provided in the connection section (7) and is located below the impedance hole (2); both ends of the drainage pipe (5) are respectively connected to the water conveyance tunnel (1) and the connection pipe (3).

7. The impedance-type voltage regulating well structure according to claim 1, characterized in that: A water stop belt (6) is provided between the pressure regulating well (4) and the connecting pipe (3), and between the connecting pipe (3) and the connecting section (7).

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