Adjusting tank utilizing construction adit as capacity expansion of underground cave depot

Abstract

The invention discloses a regulating reservoir using a construction adit as an underground cave depot capacity expansion. The regulating reservoir comprises a regulating reservoir body, the construction adit, a water delivery tunnel, a surge shaft, a flow control facility and a plugging body. The regulating reservoir is positioned at the downstream of the flow control facility and plays a role in regulating a downstream water delivery pipeline communicated to a water plant; one end of the construction adit is connected with the regulating reservoir, and the other end of the construction adit is connected with a tunnel section of the water delivery tunnel at the upstream of the surge shaft; the water conveying tunnel is a main flow passing channel, and the surge shaft is located on the upstream of the tail end of the water conveying tunnel and arranged close to a flow control facility as much as possible. The flow control facility is located at an outlet of the water delivery tunnel, the upstream is connected with the water delivery tunnel through a branch pipe, the downstream is connected with the regulating reservoir, the flow control facility comprises a flow regulating valve and a power station, and the flow regulating valve and the power station are arranged in parallel; the plugging body is arranged at the intersection of the construction adit and the water delivery tunnel and used for sealing the inner end of the construction adit. The method has the advantages of saving construction land and saving building materials.

Description

Technical Field

[0001] The present invention relates to a regulating pond structure in water conservancy and hydropower projects, specifically to a regulating pond structure in water diversion and regulation projects. To meet the requirements of the regulating pond capacity and reduce the project land occupation of the regulating pond, the construction access tunnel is utilized to concurrently serve as an underground cavern for expanding the regulating pond. Background Art

[0002] At the end of the tunnel in a long-distance water conveyance system, a control gate and a flow regulating valve are generally set for flow control. However, these two facilities cannot recycle the surplus energy of the system, resulting in energy waste. A power station can generate electricity using the remaining water head. However, in water diversion and supply projects, ensuring the water quality and quantity of the water supply is the primary task. To maintain the downstream water level basically constant to meet the water intake level requirements of downstream water plants, the guide vane opening of the unit needs to be frequently adjusted when the flow rate changes. Therefore, in the case of the end of a long-distance large-flow pressurized water conveyance system, the scheme of using a power station to control the flow rate and recycle energy is rather rare.

[0003] Chinese Patent CN214460074U proposes a compound flow control and energy recovery system, including a power station, a flow regulating valve, a control gate, a surge chamber, connecting pipelines, an outlet pool, and a water conveyance tunnel. By operating the power station and the flow regulating valve in parallel, the advantages of the power station unit with mature technology and good durability, high flow control accuracy of the flow regulating valve, large low-water-level flow-through capacity of the control gate, and stable pipeline pressure of the surge chamber can be fully exerted. To eliminate the water hammer effect of the unit load rejection, a surge chamber needs to be set near the outlet of the water conveyance tunnel. After a surge chamber is set at the end of the water conveyance system, to avoid the cross-construction of the surge chamber and the water conveyance tunnel upstream of the surge chamber, especially to reduce the cross-influence of the excavation and lining of the power station and the flow regulating valve chamber at the tunnel outlet and the tunnel and meet the requirements of the project progress, a construction access tunnel often needs to be additionally set upstream of the surge chamber. However, this system does not have a construction access tunnel and fails to utilize the construction access tunnel as a regulating pond.

[0004] To maintain the basic constancy of the downstream water level and meet the requirements of stable water head water supply for water plants, a regulating pond needs to be set downstream of the flow control facility. According to the "Outdoor Water Supply Design Standard" (GB 50013-2018), when there is no regulating structure in the pipe network, the regulating volume of the regulating pond can be determined according to 10% - 20% of the highest daily design volume of the water plant. For projects with a large water conveyance flow rate, when it is necessary to use newly added land to set up a regulating pond, since the lowest water level of the regulating pond is restricted by the water conveyance requirements of the downstream pipe network and the highest water level is restricted by the highest tail water level of the power station, using the tunnel section of the construction access tunnel as part of the regulating pond for regulation and storage during the operation period can not only reduce the actual demand for the land of the regulating pond, but also give full play to the function of the construction access tunnel, which is a creative move of making one hole serve multiple purposes. Summary of the Invention

[0005] In order to reduce the floor area of the regulating pond downstream of the flow control facility at the outlet of the long-distance water conveyance tunnel, the present invention provides a regulating pond that utilizes a construction access tunnel to double as an underground cavern for expansion. The outlet of the construction access tunnel is arranged within the regulating pond, with its elevation matching the water level of the regulating pond, thereby achieving the goals of saving land and materials simultaneously.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A regulating pond that utilizes a construction access tunnel to double as an underground cavern for expansion, comprising a regulating pond, a construction access tunnel, a water conveyance tunnel, a surge shaft, a flow control facility, and a sealing body; the regulating pond is located downstream of the flow control facility and regulates the downstream water conveyance pipeline leading to the water plant; one end of the construction access tunnel is connected to the regulating pond, and the other end is connected to the section of the water conveyance tunnel upstream of the surge shaft; the water conveyance tunnel is the main flow passage, the surge shaft is located upstream of the end of the water conveyance tunnel and is arranged as close as possible to the flow control facility, the flow control facility is located at the outlet of the water conveyance tunnel, and is connected to the water conveyance tunnel through a wye upstream and to the regulating pond downstream; the sealing body is arranged at the intersection of the construction access tunnel and the water conveyance tunnel to seal the inner end of the construction access tunnel.

[0008] Furthermore, the construction access tunnel is both the construction working surface of the water conveyance tunnel. After the sealing body is set at the intersection with the water conveyance tunnel during the operation period, it can also play a regulating and storage role similar to that of an underground cavern.

[0009] Furthermore, the flow control facility includes a flow regulating valve and a power station, and the flow regulating valve and the power station are arranged in parallel.

[0010] The beneficial effects of the present invention are as follows:

[0011] 1. Save construction land. Restricted by the volume requirements and the functional requirements of the fixed upper and lower water level boundaries, the regulating pond has a large area. By using the construction access tunnel as an underground cavern for regulation and storage, a large amount of construction land can be saved.

[0012] 2. Save building materials. After the volume of the regulating pond is reduced, the earthwork excavation volume can be reduced, thereby reducing the earthwork waste volume. As a comprehensive utilization building, the construction access tunnel is mainly composed of rock excavation materials, and the tunnel slag can be processed into coarse aggregates for the concrete of the regulating pond retaining wall, further saving building materials, and the economic benefits are very significant. Description of the Drawings

[0013] Figure 1 is the plan layout diagram of the embodiment of the present invention;

[0014] Figure 2 is Figure 1 the A-A cross-sectional view of

[0015] Figure 3 is Figure 1Cross-sectional view taken along line B-B

[0016] In the figure: 1 - regulating pond; 2 - construction access tunnel; 3 - water conveyance tunnel; 31 - bifurcation pipe; 4 - surge shaft; 5 - flow control facility; 51 - flow regulating valve; 52 - power station; 6 - plugging body. Specific embodiments

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] As Figures 1 to 3 shown, a regulating pond of the present invention that utilizes a construction access tunnel to also serve as an expansion of an underground cavern includes a regulating pond 1, a construction access tunnel 2, a water conveyance tunnel 3, a surge shaft 4, a flow control facility 5, and a plugging body 6; the regulating pond 1 is located downstream of the flow control facility 5 and regulates the downstream water conveyance pipeline leading to the water plant; one end of the construction access tunnel 2 is connected to the regulating pond 1, and the other end is connected to the section of the water conveyance tunnel 3 upstream of the surge shaft 4. It is both a construction working surface of the water conveyance tunnel 3. After a plugging body 6 is set at the intersection with the water conveyance tunnel 3 during the operation period, it can also play a regulating role similar to that of an underground cavern; the water conveyance tunnel 3 is the main flow passage, and the surge shaft 4 is located upstream of the end of the water conveyance tunnel 3 and is arranged as close as possible to the flow control facility 5; the flow control facility 5 is located at the outlet of the water conveyance tunnel 3, connected to the water conveyance tunnel 3 through a bifurcation pipe 31 upstream and to the regulating pond 1 downstream. The flow control facility 5 includes a flow regulating valve 51 and a power station 52, and the flow regulating valve 51 and the power station 52 are arranged in parallel; the plugging body 6 is set at the intersection of the construction access tunnel 2 and the water conveyance tunnel 3 to seal the inner end of the construction access tunnel 2.

[0019] The above embodiments have described the present invention with reference to the accompanying drawings, but it should not be construed as limiting the protection scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the technical solutions obtained by equivalent substitution or equivalent transformation all fall within the protection scope of the present invention.

Claims

1. A regulating pond that utilizes a construction branch tunnel to also serve as an underground cavern expansion, characterized in that: It includes a regulating tank, a construction branch tunnel, a water conveyance tunnel, a pressure regulating well, a flow control facility and a plugging body; the regulating tank is located downstream of the flow control facility and plays a regulating role on the downstream water conveyance pipeline leading to the water plant; one end of the construction branch tunnel is connected to the regulating tank, and the other end is connected to the tunnel section of the water conveyance tunnel upstream of the pressure regulating well; the water conveyance tunnel is the main flow passage, the pressure regulating well is located upstream of the end of the water conveyance tunnel and is arranged close to the flow control facility, the flow control facility is located at the outlet of the water conveyance tunnel, connected to the water conveyance tunnel upstream through a branch pipe, and connected to the regulating tank downstream; the plugging body is arranged at the intersection of the construction branch tunnel and the water conveyance tunnel to close the inner end of the construction branch tunnel.

2. The regulating pond for expanding the underground cavern by utilizing the construction branch tunnel according to claim 1 is characterized in that: The construction branch tunnel serves as the construction working surface of the water conveyance tunnel. After the blocking body is set at the intersection with the water conveyance tunnel during the operation period, it plays a storage and regulation role similar to that of an underground cavern.

3. The regulating pond for expanding the underground cavern by utilizing the construction branch tunnel according to claim 1 is characterized in that: The flow control facility comprises a flow regulating valve and a power station, and the flow regulating valve and the power station are arranged in parallel.

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