Layered water taking structure based on reservoir drainage diversion tunnel and emptying tunnel

Abstract

The utility model discloses a layered water taking structure based on a reservoir drainage diversion tunnel and an emptying tunnel. The layered water taking structure comprises a combined tower, the diversion tunnel and the emptying tunnel. The rear section of the emptying hole inclines downwards and is communicated with the diversion hole; a low-water-level water supply pipe is arranged at the bottom of the diversion tunnel, the water inlet end of the low-water-level water supply pipe is flush with a water inlet opening of the diversion tunnel, and the water outlet end of the low-water-level water supply pipe extends out of a water outlet opening of the diversion tunnel. A high-water-level water supply pipe is buried in the bottom of the emptying hole, the water inlet end of the high-water-level water supply pipe is located below a water inlet of the emptying hole, and the water outlet end of the high-water-level water supply pipe is communicated with the low-water-level water supply pipe through a three-way connector; a trash rack, a low-water-level gate groove and a high-water-level gate groove are arranged on the combined tower, a low-water-level gate is arranged in the low-water-level gate groove, and a high-water-level gate is arranged in the high-water-level gate groove. The utility model has the advantages that the arrangement structure of one tower and two holes is realized, the combined arrangement problem of the diversion hole and the emptying hole is effectively solved, the excavation length of the emptying hole is greatly reduced, and layered water taking of the reservoir is easily realized.

Description

Technical Field

[0001] This utility model relates to the field of reservoir construction engineering technology, and in particular to a layered water intake structure based on a reservoir spillway and venting tunnel. Background Technology

[0002] Diversion tunnels and venting tunnels are important water discharge facilities in reservoir dam construction, serving to discharge water, empty the reservoir, and facilitate maintenance. Since the actual excavation dimensions of venting tunnels are smaller than those of diversion tunnels, it is suitable to utilize diversion tunnels for venting tunnel construction. However, the elevation requirements for venting tunnels are often greater than the siltation elevation, frequently requiring a separate intake tower design. This makes it difficult to repurpose existing diversion tunnels, resulting in the diversion tunnels excavated during reservoir construction not being utilized effectively. Furthermore, venting tunnels with water diversion functions require separate intake and diversion tunnel designs, increasing concrete engineering investment and necessitating the construction of a separate traffic bridge at the tower top, significantly raising project costs. In addition, ensuring the structural stability of the venting tunnel intake tower (well) often requires additional slope excavation, occupying space for spillways, fish passages, and other structures. In situations with severely limited terrain and geological conditions, such structures may even be impossible to construct, greatly increasing the difficulty of layout and construction period. In conclusion, designing a layered water intake structure that combines diversion tunnels and venting tunnels is an important problem that urgently needs to be solved in current reservoir construction projects. Summary of the Invention

[0003] The purpose of this utility model is to provide a layered water intake structure based on a reservoir spillway and venting tunnel.

[0004] To achieve the above objectives, the present invention can adopt the following technical solution:

[0005] The layered water intake structure based on a reservoir spillway diversion tunnel and a venting tunnel, as described in this utility model, includes a combined tower erected vertically on the reservoir slope, and a diversion tunnel and a venting tunnel located on the reservoir slope behind the combined tower. The diversion tunnel is located at the low water level of the reservoir, and the venting tunnel is located at the high water level of the reservoir above the diversion tunnel. The rear section of the venting tunnel slopes downwards and connects to the diversion tunnel. A low-water-level water supply pipe is installed at the bottom of the diversion tunnel, with its inlet end flush with the inlet of the diversion tunnel and its outlet end extending from the outlet of the diversion tunnel. The high-level water supply pipe is buried at the bottom of the vent hole. The inlet of the high-level water supply pipe is located below the inlet of the vent hole, and its outlet is bent downward and connected to the low-level water supply pipe through a T-junction. The combined tower is provided with a trash rack, a low-level gate slot and a high-level gate slot in sequence from the water-facing side to the water-repellent side. The low-level gate slot is provided with a low-level gate for sealing the diversion hole and the low-level water supply pipe, and the high-level gate slot is provided with a high-level gate for sealing the vent hole and the high-level water supply pipe.

[0006] Furthermore, multiple anchor blocks for fixing the low-water-level water supply pipe can be installed at intervals along the length of the diversion tunnel, so that the low-water-level water supply pipe can be stably fixed in the diversion tunnel.

[0007] The advantages of this utility model are that by setting up a combined tower on the sloping surface of the inner side of the reservoir, and opening a diversion tunnel at the low water level and a discharge tunnel at the high water level on the reservoir slope on the back side of the combined tower, the rear section of the discharge tunnel is connected to the diversion tunnel. This rationally utilizes the combined tower, diversion tunnel, and discharge tunnel to achieve a "one tower, two tunnels" layout structure, effectively solving the problem of the combined layout of the diversion tunnel and the discharge tunnel, greatly reducing the excavation length of the discharge tunnel, reducing the engineering investment and construction period of the reservoir dam, and also facilitating the layout and connection of the low water level water supply pipe and the high water level water supply pipe, easily realizing the stratified water intake of the reservoir. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0010] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0011] like Figure 1 As shown, the layered water intake structure based on the reservoir spillway diversion tunnel and the venting tunnel of this utility model includes a combined tower 1 vertically erected on the reservoir slope 100, and a diversion tunnel 2 and a venting tunnel 3 horizontally excavated on the reservoir slope 100 behind the combined tower 1.

[0012] Specifically, the inlet elevation of diversion tunnel 2 is increased by raising the upstream cofferdam, making it higher than the siltation elevation under the flood standard and located at the low water level of the reservoir. Meanwhile, the venting tunnel 3 is located at the high water level of the reservoir above diversion tunnel 2, and the rear section of venting tunnel 3 extends downward at an angle, connecting with diversion tunnel 2. This rationally utilizes the combined tower 1, diversion tunnel 2, and venting tunnel 3 to achieve a "one tower, two tunnels" layout structure, effectively solving the problem of the combined layout of diversion tunnel 2 and venting tunnel 3, greatly reducing the excavation length of venting tunnel 3, and reducing the engineering investment and construction period of the reservoir dam.

[0013] A low-level water supply pipe 4 is installed at the bottom of the diversion tunnel 2. The low-level water supply pipe 4 is laid along the length of the diversion tunnel 2, with its inlet end flush with the inlet of the diversion tunnel 2, and its outlet end extending outward from the outlet of the diversion tunnel 2. To make the low-level water supply pipe 4 more stable, multiple anchor blocks 5 are installed at intervals along the length of the diversion tunnel 2 to fix the low-level water supply pipe 4, so that the low-level water supply pipe 4 can be stably fixed in the diversion tunnel 2. A high-level water supply pipe 6 is buried at the bottom of the venting tunnel 3. The inlet end of the high-level water supply pipe 6 is located below the inlet of the venting tunnel 3, while the outlet end is bent downward and connected to the low-level water supply pipe 4 through a T-joint 7, which facilitates the arrangement and connection of the low-level water supply pipe 4 and the high-level water supply pipe 6, and easily realizes the stratified water intake of the reservoir.

[0014] In addition, a trash rack 8, a low-water level gate slot 9, and a high-water level gate slot 10 are sequentially installed on the combined tower 1 from the water-facing side to the back-water side. The trash rack 8 is used to prevent debris in the reservoir from entering the low-water level water supply pipe 4 and the high-water level water supply pipe 6. The low-water level gate slot 9 is equipped with a low-water level gate 11 for sealing the diversion tunnel 2 and the low-water level water supply pipe 4. The high-water level gate slot 10 is equipped with a high-water level gate 12 for sealing the venting tunnel 3 and the high-water level water supply pipe 6.

[0015] During actual construction, the slope of the reservoir slope 100 is first cut according to the specific location of the diversion tunnel 2 designed for the construction of the reservoir dam (including clearing the slope overburden and treating dangerous rocks). After the slope cutting is completed, the diversion tunnel 2 can be excavated laterally on the reservoir slope 100 (excavating from both ends towards the middle at the same time). At the same time, the venting tunnel 3 is excavated on the reservoir slope 100 directly above the diversion tunnel 2. After the venting tunnel 3 is excavated to a certain length, it is excavated downwards at an angle until it connects with the diversion tunnel 2 below.

[0016] Then, a combined tower 1 is built on the slope in front of the inlet of the diversion tunnel 2. On the combined tower 1, from the water-facing side to the back water-facing side, a trash rack 8, a low-water level gate slot 9, and a high-water level gate slot 10 are installed in sequence. The low-water level gate slot 9 corresponds to the diversion tunnel 2 and is equipped with a low-water level gate 11 for sealing the diversion tunnel 2 and the low-water level water supply pipe 4. The high-water level gate slot 10 corresponds to the venting tunnel 3 and is equipped with a high-water level gate 12 for sealing the venting tunnel 3 and the high-water level water supply pipe 6.

[0017] Afterwards, the backfilling and reinforcement of the backwater side of the combined tower 1 were completed. At the same time, a low-level water supply pipe 4 was laid along the length direction on the bottom surface of the diversion tunnel 2, and anchor blocks 5 for fixing the low-level water supply pipe 4 were poured at intervals. A high-level water supply pipe 6 was buried at the bottom of the venting tunnel 3. The outlet end of the high-level water supply pipe 6 was bent downwards and connected to the low-level water supply pipe 4 through a T-joint 7. Then, the inlet of the diversion tunnel 2 and the connecting opening of the diversion tunnel 2 connected to the venting tunnel 3 were backfilled and sealed.

[0018] After construction is completed, water can be easily drawn from the low-water-level water supply pipe 4 or the high-water-level water supply pipe 6 by controlling the opening and closing of the low-water-level gate 4 and the high-water-level gate 6, thus realizing stratified water intake from the reservoir.

Claims

1. A layered water intake structure based on reservoir discharge diversion tunnel and venting tunnel, characterized in that: The combined tower is erected vertically on the reservoir slope, and the diversion tunnel and the vent hole are located on the reservoir slope behind the combined tower; the diversion tunnel is located at the low water level of the reservoir, the vent hole is located at the high water level of the reservoir above the diversion tunnel, and the rear section of the vent hole is inclined downward and communicated with the diversion tunnel; a low water level water supply pipe is arranged at the bottom of the diversion tunnel, the water inlet end of the low water level water supply pipe is flush with the water inlet opening of the diversion tunnel, and the water outlet end of the low water level water supply pipe extends out from the water outlet opening of the diversion tunnel; a high water level water supply pipe is embedded at the bottom of the vent hole, the water inlet end of the high water level water supply pipe is located below the water inlet opening of the vent hole, and the water outlet end of the high water level water supply pipe is bent downward and communicated with the low water level water supply pipe through a tee joint; a trash rack, a low water level gate slot and a high water level gate slot are sequentially arranged on the combined tower from the water side to the backwater side, a low water level gate for blocking the diversion tunnel and the low water level water supply pipe is arranged in the low water level gate slot, and a high water level gate for blocking the vent hole and the high water level water supply pipe is arranged in the high water level gate slot.

2. The hierarchical water intake structure based on reservoir release diversion tunnel and venting tunnel according to claim 1, characterized in that: A plurality of abutments for fixing the low water level water supply pipe are arranged in the diversion tunnel along the length direction.

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