Arrangement structure for improving minimum pressure of tail end of upper diversion adit

Abstract

The utility model provides an arrangement structure for increasing the minimum pressure at the tail end of a water diversion upper adit, which comprises an upper reservoir water inlet / outlet, an emergency gate shaft, the water diversion upper adit and a water diversion inclined shaft which are sequentially arranged downwards from upstream, lining concrete is poured in the emergency gate shaft, and a gate groove is formed in the middle of the lining concrete. Gate groove concrete is poured at the four corners of the gate groove respectively, a breast wall is arranged between the two gate groove concrete located on the upstream side, the breast wall is located on the lower portion of the lining concrete, and the bottom face of the breast wall is connected with a water diversion upper adit. Therefore, the size of an orifice at the joint of the lower portion of the gate groove and the water diversion upper adit is reduced, the minimum pressure of the tail end of the water diversion upper adit in the hydraulic transient process is improved, the structure is simple, construction is convenient, the excavation volume of elevation increase of a water inlet and a water outlet is avoided, and engineering investment is saved.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering technology, and in particular to an arrangement structure for increasing the minimum pressure at the end of the water diversion tunnel. Background Technology

[0002] In the design of pumped storage power stations, for water intake systems without a surge tank, a short upper intake tunnel is connected after the upper reservoir emergency gate well, which is then connected to the intake inclined / vertical shaft. To meet the equipment layout requirements for the excavation and construction of the intake inclined / vertical shaft, the distance from the transition section after the upper reservoir emergency gate well to the starting point of the upper bend section of the intake inclined / vertical shaft is generally required to be more than 40m. In this case, during the hydraulic transient process of the water conveyance system, because the end of the upper intake tunnel is far from the upper reservoir and the upper reservoir emergency gate well, the minimum pressure at the end of the upper intake tunnel often fails to meet the specification requirement of 2m pressure, or even negative pressure occurs, endangering the safe operation of the water conveyance system and the generating units.

[0003] To meet the minimum pressure requirements along the water conveyance system, the conventional practice has been to lower the elevation of the bottom plate of the upper reservoir inlet / outlet and simultaneously lower the elevation of the upper horizontal tunnel, thereby increasing the minimum pressure at the end of the upper horizontal tunnel. This would significantly increase the amount of excavation and support work at the upper reservoir inlet / outlet, resulting in a substantial increase in project investment. Furthermore, the increased slope height at the inlet / outlet would raise the risk to slope stability and safety. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an arrangement structure that increases the minimum pressure at the end of the upper water diversion tunnel. This structure can solve the problem of the pressure at the end of the upper water diversion tunnel not meeting the specifications or even negative pressure during the hydraulic transient process of the water conveyance system without adjusting the upper reservoir inlet / outlet and the elevation of the upper water diversion tunnel.

[0005] Therefore, the present invention adopts the following technical solution:

[0006] An arrangement structure for improving the minimum pressure at the end of the water diversion tunnel includes an upper reservoir inlet / outlet, an emergency gate well, a water diversion tunnel, and a water diversion inclined shaft arranged sequentially from upstream to downstream. The emergency gate well is lined with concrete, and a gate slot is provided in the middle of the lining concrete. Gate slot concrete is poured at the four corners of the gate slot. A breast wall is provided between the two gate slot concretes on the upstream side. The breast wall is located at the lower part of the lining concrete, and the bottom surface of the breast wall is connected to the water diversion tunnel.

[0007] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[0008] The height of the breast wall shall not exceed 5m.

[0009] The thickness of the breast wall does not exceed the concrete of the doorway on the same side.

[0010] The longitudinal slope ratio of the water diversion tunnel is 10%.

[0011] A lintel concrete is provided between the two gate slot concretes on the downstream side. The lintel concrete is located at the lower part of the emergency gate well and is in contact with the lower wall of the water diversion tunnel.

[0012] The breast wall and the lining concrete are poured simultaneously and formed as a single unit.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects: by setting a breast wall between the two gate slot concrete on the upstream side, the orifice size at the junction of the lower part of the gate slot and the upper water diversion tunnel is reduced, thereby increasing the minimum pressure at the end of the upper water diversion tunnel during hydraulic transients. The structure is simple, the construction is convenient, and it avoids the excavation volume increase caused by reducing the elevation of the inlet and outlet, thus saving project investment. Attached Figure Description

[0014] Figure 1 This is a typical cross-sectional structural diagram of the present invention.

[0015] Figure 2 This utility model Figure 1 A schematic diagram of the structure at point AA.

[0016] Figure 3 This utility model Figure 1 Enlarged schematic diagram of the structure at point B. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting this utility model. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this utility model.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] This utility model provides an arrangement structure for improving the minimum pressure at the end of the water diversion upper horizontal tunnel, including an upper reservoir inlet / outlet 5, an emergency gate well 4, a water diversion upper horizontal tunnel 3, and a water diversion inclined shaft 6 arranged sequentially from upstream to downstream. The emergency gate well 4 is filled with lining concrete 41, and a gate slot 42 is provided in the middle of the lining concrete 41. Gate slot concrete 43 is poured at the four corners of the gate slot 42. A breast wall 1 is provided between the two gate slot concrete 43 located on the upstream side. The breast wall 1 is located at the lower part of the lining concrete 41, and the bottom surface of the breast wall 1 is connected to the water diversion upper horizontal tunnel 3.

[0020] like Figure 1 As shown, the emergency gate well 4 is vertically arranged downstream of the upper reservoir inlet / outlet 5, and the end of the downstream inclined water diversion tunnel 3 is connected to the water diversion inclined well 6 through a curved section.

[0021] The height of the breast wall 1 shall not exceed 5m.

[0022] The thickness of the breast wall 1 shall not exceed 43 cubic meters of concrete in the doorway on the same side.

[0023] The breast wall 1 protrudes from the lining concrete 41, and its thickness does not affect the operation of the emergency gate in the gate slot 42.

[0024] By setting a breast wall 1 that protrudes into the gate slot 42, the orifice size at the junction of the lower part of the gate slot 42 and the upper horizontal tunnel for water intake is reduced.

[0025] The longitudinal slope ratio of the upper horizontal tunnel 3 is 10%.

[0026] A top lintel concrete 2 is provided between the two gate slot concrete 43 located on the downstream side. The top lintel concrete 2 is located at the lower part of the accident gate well 4 and is connected to the upper wall of the water diversion tunnel 3.

[0027] The breast wall 1 and the lining concrete 41 were poured simultaneously and formed as a single unit.

[0028] In this embodiment, the breast wall 1 and the lining concrete 41 are the first-stage poured concrete, while the door slot concrete 43 and the lintel concrete 2 are the second-stage poured concrete.

[0029] Since the volume of the added breast wall 1 concrete is very limited (not exceeding the thickness of the same side gate slot concrete 43 and the height range not exceeding 5m), the required cost is not large, and it can be poured together with the gate well lining concrete 41, making construction convenient. This avoids the large amount of excavation and support and project investment that would otherwise be increased by lowering the elevation of the inlet and outlet to meet the minimum pressure requirements along the water conveyance system during the hydraulic transition. It effectively increases the minimum pressure at the end of the water diversion tunnel at a very low cost, ensuring that it is within the scope of the specifications and structural control requirements, and ensuring the safety of the water conveyance structure and unit operation.

[0030] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use the arrangement structure of this utility model to increase the minimum pressure at the end of the water diversion tunnel, and can produce the positive effects described in this utility model.

[0031] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "connected," and "sleeve-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0033] Furthermore, in practicing the claims of this utility model, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the present utility model are covered by the scope of the claims of the present utility model, and will not be listed here.

Claims

1. An arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel for water diversion, comprising, in sequence from upstream to downstream, an upper reservoir inlet / outlet (5), an emergency gate well (4), an upper horizontal tunnel for water diversion (3), and an inclined shaft for water diversion (6), characterized in that, The accident gate well (4) is filled with lining concrete (41), and a gate slot (42) is provided in the middle of the lining concrete (41). Gate slot concrete (43) is poured at the four corners of the gate slot (42). A breast wall (1) is provided between the two gate slot concrete (43) on the upstream side. The breast wall (1) is located at the lower part of the lining concrete (41), and the bottom surface of the breast wall (1) is connected to the water diversion tunnel (3).

2. The arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel as described in claim 1, characterized in that, The height of the breast wall (1) shall not exceed 5m.

3. The arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel as described in claim 1, characterized in that, The thickness of the breast wall (1) does not exceed the thickness of the door groove concrete (43) on the same side.

4. The arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel as described in claim 1, characterized in that, The longitudinal slope ratio of the water diversion tunnel (3) is 10%.

5. The arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel as described in claim 1, characterized in that, A top lintel concrete (2) is provided between the two gate slot concrete (43) on the downstream side. The top lintel concrete (2) is located at the lower part of the accident gate well (4) and is connected to the lower wall of the water diversion upper horizontal tunnel (3).

6. The arrangement structure for increasing the minimum pressure at the end of the upper horizontal tunnel as described in claim 1, characterized in that, The breast wall (1) and the lining concrete (41) are poured simultaneously and formed as a single unit.

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