High-water-head power station construction adit plug manhole structure

Abstract

The utility model provides a high-water-head power station construction adit plug manhole structure which comprises a solid section concrete plug located on one side of a water diversion high-pressure tunnel, a manhole hole is formed in the solid section concrete plug, a steel pipe lining is arranged on the inner wall of the manhole hole, a manhole hole choke plug is arranged at the position, close to the water diversion high-pressure tunnel, of the manhole hole, and the steel pipe lining is arranged on the inner wall of the manhole hole. The man entering door is opened towards one side of the water diversion high-pressure tunnel, and the man entering hole is formed in the solid section concrete plug, so that maintainers can conveniently enter water diversion high-pressure maintenance through the man entering hole; meanwhile, the manhole door opened towards one side of the water diversion high-pressure tunnel is arranged on the solid section concrete plug, the sealing performance of the manhole plug can be guaranteed by means of dynamic water pressure, additional auxiliary equipment is not needed to pressurize the manhole plug, and the manhole plug is safe, stable, simple in structure and good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a manhole structure for the plug of a construction access tunnel of a high-head power station. Background Art

[0002] In water conservancy and hydropower projects, the construction access tunnels are generally sealed with permanent concrete plugs before the power station is actually put into operation to resist the water pressure in the tunnel. Since the plug of the construction access tunnel is a permanent building, its design level, stability and anti-seepage requirements are the same as those of the water retaining structure. Therefore, when setting manholes in the solid concrete plug, it is necessary to ensure its strength, impermeability and durability. For example, in the conventional design of the construction access tunnel of a power station, the blind head of the manhole of the construction access tunnel relies on the force of bolts to ensure sealing. This method cannot make full use of the action of the water pressure in the tunnel and is prone to metal fatigue. Once tensile failure occurs and water leakage occurs, it will greatly affect the normal operation of the power station. Moreover, the front end of the blind head in some projects extends into the high-pressure water diversion tunnel, affecting the flow-through capacity, or the design uses manholes with equal diameters, resulting in material waste and excessive strength, or conversely, insufficient strength. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a manhole structure for the plug of a construction access tunnel of a high-head power station, which can solve the problem of easy occurrence of metal fatigue in the conventional method.

[0004] For this purpose, the utility model adopts the following technical solutions:

[0005] A manhole structure for the plug of a construction access tunnel of a high-head power station, comprising a solid-section concrete plug on one side of the high-pressure water diversion tunnel. An access hole is arranged inside the solid-section concrete plug. The inner wall of the access hole is provided with a steel pipe lining. An access hole blind head is arranged at a position of the access hole close to the high-pressure water diversion tunnel, and the access door opens towards the high-pressure water diversion tunnel side.

[0006] On the basis of adopting the above technical solutions, the utility model can also adopt the following further technical solutions, or use a combination of these further technical solutions:

[0007] A hollow-section concrete plug is connected to the side of the solid-section concrete plug away from the high-pressure water diversion tunnel.

[0008] The solid-section concrete plug comprises a first solid section and a second solid section. The first solid section is located on the side of the access hole close to the high-pressure water diversion tunnel, and a construction joint is arranged between the first solid section and the second solid section.

[0009] A water stop is arranged at the upper end of the construction joint.

[0010] The cross-section of the access hole is circular. The access hole includes a small-diameter section, a variable-diameter section, and a large-diameter section. The small-diameter section is located within the first solid section, the large-diameter section is located within the second solid section, the variable-diameter section connects the small-diameter section and the large-diameter section, and the construction joint is located on the side of the variable-diameter section close to the large-diameter section.

[0011] A number of stiffening rings are provided on the outer wall of the steel pipe lining.

[0012] The width of the stiffening ring is equal to the wall thickness of the steel pipe lining, and the distance between two adjacent stiffening rings is 1 - 3 m.

[0013] The front end of the access hole plug does not exceed the inner wall of the high-pressure water diversion tunnel.

[0014] The aperture of the access hole is 1.0 - 1.8 m.

[0015] A stainless steel ladder is provided on the side of the access hole plug close to the high-pressure water diversion tunnel. The stainless steel ladder includes a number of climbing bars, and the height of each climbing bar is 25 - 30 cm.

[0016] Compared with the prior art, the present utility model has the following advantages and beneficial effects: By providing an access hole in the solid-section concrete plug, it is convenient for maintenance personnel to enter the high-pressure water diversion tunnel through the access hole for maintenance; at the same time, an access door opening towards the high-pressure water diversion tunnel is provided in the solid-section concrete plug, and the hydrostatic pressure can be utilized to ensure the sealing of the access hole plug, eliminating the need for additional auxiliary equipment to pressurize the access hole plug. It is safe, stable, simple in structure, and has a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a plan view of the present utility model.

[0018] Figure 2 is a sectional view of the connection part between the construction access tunnel and the high-pressure water diversion tunnel of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the preferred implementation solutions of the present utility model will be described below in conjunction with specific embodiments. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar functional elements throughout. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation to the present utility model; for better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation to the present utility model.

[0020] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments, but it shall not be used as a basis for limiting the present utility model.

[0021] A structure of an access hole for a plug of a construction branch tunnel in a high-head power station provided by the present utility model includes a solid-section concrete plug 1 on one side of a diversion high-pressure tunnel 8. An access hole 2 is provided inside the solid-section concrete plug 1. A steel pipe lining 3 is provided on the inner wall of the access hole 2. An access hole plug 5 is provided at a position of the access hole 2 close to the diversion high-pressure tunnel 8. The access door opens towards the diversion high-pressure tunnel 8.

[0022] Through the access hole plug 5 and with the access door opening towards the diversion high-pressure tunnel 8, it is possible to pressurize the access hole plug 5 without relying on auxiliary facilities, improve the tightness of the access hole plug, and the characteristic of circumferential force bearing avoids the metal fatigue problem that the bolt force-bearing structure usually faces, so as to extend the service life of the project.

[0023] By providing the steel pipe lining 3, it is possible to prevent the water body in the diversion high-pressure tunnel 8 from seeping around through the access door into the access hole 2.

[0024] A hollow-section concrete plug 4 is connected to the side of the solid-section concrete plug 1 away from the diversion high-pressure tunnel 8. By providing the hollow-section concrete plug 4, the seepage path can be extended, and it can jointly resist the internal water pressure with the solid-section concrete plug 1.

[0025] The solid-section concrete plug 1 includes a first solid section 11 and a second solid section 12. The first solid section 11 is located on the side of the access hole 2 close to the diversion high-pressure tunnel 8. A construction joint 9 is provided between the first solid section 11 and the second solid section 12.

[0026] A water stop 10 is provided at the upper end of the construction joint 9. In this embodiment, the water stop 10 is a copper water stop. By providing the water stop 10, the seepage path can be extended, and it can jointly resist the internal water pressure with the solid-section concrete plug 1.

[0027] The cross-section of the access hole 2 is circular. The access hole 2 includes a small-diameter section 21, a variable-diameter section 22, and a large-diameter section 23. The small-diameter section 21 is located inside the first solid section 11, the large-diameter section 21 is located inside the second solid section 12, the variable-diameter section 22 connects the small-diameter section 21 and the large-diameter section 23, and the construction joint 9 is located on the side of the variable-diameter section 22 close to the large-diameter section 23.

[0028] The setting of the variable aperture of the access hole 2 can not only ensure the stability of the access hole 2 under the external water pressure but also facilitate the access of maintenance personnel in the access hole 2.

[0029] A number of stiffening rings 6 are provided on the outer wall of the steel pipe lining 3.

[0030] The ring width of the stiffening ring 6 is equal to the wall thickness of the steel pipe lining 3. The distance between two adjacent stiffening rings 6 is 1 - 3 m. The row spacing is set according to the water head in the water conveyance high-pressure tunnel 8. The higher the water head, the smaller the row spacing.

[0031] The stiffening ring 6 not only improves the overall stability and bearing capacity of the access hole, but also can resist the vibration of the water flow.

[0032] The front end of the access hole plug 5 does not exceed the inner wall of the water conveyance high-pressure tunnel 8. Controlling the front-end size of the access hole plug 5 can effectively prevent water blocking phenomena, so as to improve the water energy utilization efficiency.

[0033] The aperture of the access hole 2 is 1.0 - 1.8 m.

[0034] On one side of the access hole plug 5 close to the water conveyance high-pressure tunnel 8, there is a stainless-steel climbing ladder 7. The stainless-steel climbing ladder 7 includes several climbing bars, and the height of each climbing bar is 25 - 30 cm.

[0035] In this embodiment, the climbing bars of the stainless-steel climbing ladder 7 are embedded into the inner wall concrete of the water conveyance high-pressure tunnel 8, and the embedding depth is not less than 15 cm.

[0036] The design of the stainless-steel climbing ladder 7 facilitates maintenance personnel to enter the water conveyance high-pressure tunnel 8.

[0037] Based on the description and drawings of the present utility model, those skilled in the art can easily manufacture or use a structure of an access hole for the plug of the construction branch tunnel of a high-head power station according to the present utility model, and can produce the positive effects recorded by the present utility model.

[0038] It should be noted that the terms "include" and "have" and any variations thereof in the description, claims and above-mentioned drawings of the present utility model are intended to cover non-exclusive inclusion. The terms "install", "set", "be provided with", "connect", "be connected" and "be sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two mechanisms, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by terms such as "one end", "the other end", "outer side", "inner side", "horizontal", "end portion", "length", "outer end", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated mechanism or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present 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.

[0040] In addition, when practicing the claims of the present utility model, those skilled in the art can understand and affect the variations of the disclosed embodiments through the study of the drawings, the disclosure, and the appended claims. In addition, in the claims and the specification, words such as "comprising", "containing", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0041] The above are only the preferred embodiments of the present utility model, and are not used to limit the scope of implementation of the present utility model. That is, 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 no further examples will be given here.

Claims

1. A plugging manhole structure for a branch hole in a high-head power station construction, characterized in that: The invention comprises a solid section concrete plug (1) located on one side of a water diversion high-pressure tunnel (8), wherein an entry hole (2) is provided inside the solid section concrete plug (1), and the inner wall of the entry hole (2) is provided with a steel pipe lining (3), and a manhole plug (5) is provided at a position of the entry hole (2) close to the water diversion high-pressure tunnel (8), and the entry door opens toward the side of the water diversion high-pressure tunnel (8).

2. A high-head power station construction branch hole plugging manhole structure as claimed in claim 1, characterized in that: The side of the solid section concrete plug (1) away from the water diversion high-pressure tunnel (8) is connected to a hollow section concrete plug (4).

3. A high-head power station construction branch hole plugging manhole structure as claimed in claim 1, characterized in that: The solid section concrete plug (1) comprises a first solid section (11) and a second solid section (12), the first solid section (11) being located on a side of the manhole (2) close to the water diversion high-pressure tunnel (8), and a construction joint (9) being provided between the first solid section (11) and the second solid section (12).

4. A high-head power station construction branch hole plugging manhole structure as claimed in claim 3, characterized in that: A water stop plate (10) is provided at the upper end of the construction joint (9).

5. A high-head power station construction branch hole plugging manhole structure as claimed in claim 3, characterized in that: The cross section of the entry hole (2) is circular. The entry hole (2) comprises a small diameter section (21), a diameter-changing section (22) and a large diameter section (23). The small diameter section (21) is located in the first solid section (11), the large diameter section (23) is located in the second solid section (12), the diameter-changing section (22) connects the small diameter section (21) and the large diameter section (23), and the construction joint (9) is located on a side of the diameter-changing section (22) close to the large diameter section (23).

6. A high-head power station construction branch hole plugging manhole structure as claimed in claim 1, characterized in that: The outer wall of the steel pipe lining (3) is provided with a plurality of stiffening rings (6).

7. A plugging manhole structure for a high-head power station construction branch hole as claimed in claim 6, characterized in that: The ring width of the stiffening ring (6) is equal to the wall thickness of the steel pipe lining (3), and the distance between two adjacent stiffening rings (6) is 1 to 3 m.

8. A plugging manhole structure for a high-head power station construction branch hole as claimed in claim 1, characterized in that: The front end of the manhole plug (5) does not exceed the inner wall of the water diversion high-pressure tunnel (8).

9. A plugging manhole structure for a high-head power station construction branch hole as described in any one of claims 1 to 5, characterized in that: The diameter of the entry hole (2) is 1.0 to 1.8 m.

10. A plugging manhole structure for construction of a branch hole of a high-head power station as claimed in claim 1, characterized in that: A stainless steel ladder (7) is provided on one side of the manhole blind (5) close to the water diversion high-pressure tunnel (8), and the stainless steel ladder (7) includes a plurality of climbing poles, and the height of each climbing pole is 25 to 30 cm.

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