Arrangement structure of mandoor of water delivery tunnel maintenance adit

Abstract

The utility model discloses a water delivery tunnel maintenance adit mandoor arrangement structure in the technical field of water conservancy and hydropower engineering, which comprises a diversion tunnel and a construction adit, a reserved hole is arranged at the intersection of the diversion tunnel and the construction adit, a mandoor hole is arranged inside the construction adit, and the reserved hole is communicated with the mandoor hole. A water sealing gate is arranged on the side, close to the diversion tunnel, of the manhole opening. The reserved hole is reserved in the intersection position of the diversion tunnel and the construction adit, the mandoor hole is formed in the construction adit, the water sealing gate is arranged in the construction adit, the construction adit can be used as an overhaul adit after the power station operates, and operation and maintenance personnel can enter the construction adit through the mandoor hole conveniently. And then the water enters the diversion tunnel through the reserved hole to be overhauled.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a water delivery tunnel maintenance branch tunnel entrance door arrangement structure. Background Art

[0002] The construction of long-distance pressurized water transfer projects across river basins and regions is an effective way to alleviate the contradiction between social water supply and demand. With the large-scale construction of long-distance water transfer projects, the reliability of water diversion tunnels has become increasingly important as a common but complex issue, which may pose a serious threat to the safety of the water transfer system. The water transfer system mainly includes water diversion tunnels, surge chambers, and plant buildings. The downstream of the water diversion tunnel is connected to the surge chamber, and the auxiliary construction channel of the surge chamber mainly includes the surge chamber traffic tunnel and the surge chamber ventilation tunnel construction branch tunnel.

[0003] In order to ensure the construction progress and reduce the construction difficulty, some construction branch tunnels are generally set up, especially for pumped storage power stations with high water heads. In order to reduce the construction difficulty of the inclined shaft or vertical shaft of the water supply system, a construction branch tunnel is usually set up in the horizontal tunnel of the water diversion tunnel to facilitate the excavation of the upper and lower inclined shafts. In the later stage of construction, it is usually necessary to block the construction branch tunnel to ensure the safe operation of the water supply tunnel, which makes it inconvenient to overhaul the water supply system in the later stage. For some projects, when setting up the access channel, the water head loss at the intersection of the construction branch tunnel and the tunnel is too large. Based on this, the present application proposes a layout structure of the access door of the water supply tunnel maintenance branch tunnel. Utility Model Content

[0004] In order to improve the problem in the prior art mentioned above that the water conveyance system usually needs to seal the construction branch tunnel in the later stage of construction to ensure the safe operation of the water conveyance tunnel, which leads to inconvenience in the maintenance of the water conveyance system in the later stage, the utility model provides a water conveyance tunnel maintenance branch tunnel entrance door arrangement structure.

[0005] The utility model provides a water conveyance tunnel maintenance branch tunnel entrance door arrangement structure, adopting the following technical solutions:

[0006] A water diversion tunnel maintenance branch tunnel entrance door arrangement structure comprises a water diversion tunnel and a construction branch tunnel, wherein a reserved opening is provided at the intersection of the water diversion tunnel and the construction branch tunnel, an entrance door opening is provided inside the construction branch tunnel, and a water sealing gate is provided on the side of the entrance door opening close to the water diversion tunnel.

[0007] By adopting the above technical solution, the construction branch tunnel can be used as a maintenance branch tunnel after the power station is put into operation, which can facilitate operation and maintenance personnel to enter the interior of the construction branch tunnel through the entrance hole and then enter the interior of the water diversion tunnel for maintenance.

[0008] Optionally, a side guide wall is provided at the junction of the water diversion tunnel and the construction branch tunnel.

[0009] By adopting the above technical solutions, the head loss during the power generation operation of the power station is reduced as much as possible, the maintenance passage is ensured to be unobstructed, and the maintenance is facilitated.

[0010] Optionally, a hollow plugging body is arranged on the side of the water sealing gate away from the diversion tunnel, and a through hole matching the access door opening is arranged inside the hollow plugging body.

[0011] By adopting the above technical solutions, the stability can be enhanced, and the convenience and safety of maintenance are improved.

[0012] Optionally, a concrete slope surface is cast on the outer side of the hollow plugging body.

[0013] By adopting the above technical solutions, it is convenient for maintenance personnel to enter and exit the inside of the construction access tunnel.

[0014] Optionally, one end of the construction access tunnel connected to the diversion tunnel is inclined upward, and the inclination angle is 45° - 60°.

[0015] By adopting the above technical solutions, the head loss is further reduced, and the adverse effects of this project on the water energy utilization efficiency are eliminated as much as possible.

[0016] Optionally, the width of the reserved orifice is equal to the width of the access door opening.

[0017] By adopting the above technical solutions, it neither affects the normal maintenance passage nor further reduces the head loss.

[0018] In summary, the present utility model has at least the following beneficial effects:

[0019] By leaving a reserved orifice at the intersection of the diversion tunnel and the construction access tunnel, and at the same time opening an access door opening inside the construction access tunnel and arranging a water sealing gate, after the power station operates, the construction access tunnel can be used as a maintenance access tunnel, which enables the operation and maintenance personnel to enter the construction access tunnel through the access door opening and then enter the inside of the diversion tunnel through the reserved orifice for maintenance.

[0020] By arranging side guide walls at the intersection position of the diversion tunnel and the construction access tunnel, the head loss can be effectively reduced, and the adverse effects of this project on the water energy utilization efficiency are eliminated as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is the front view structural schematic diagram of the present utility model;

[0023] Figure 2 is the side view structural schematic diagram of the present utility model;

[0024] Figure 3 is the connection structural schematic diagram of the construction access tunnel and the water sealing gate of the present utility model.

[0025] In the figure: 1, diversion tunnel; 2, side diversion wall; 3, construction access tunnel; 4, access manhole; 5, hollow plug; 6, reserved orifice; 7, water sealing gate; 8, concrete slope surface. Specific embodiments

[0026] The following further elaborates on the present utility model in conjunction with the attached Figures 1-3 drawings.

[0027] Please refer to the drawings in the specification Figure 1 and Figure 2 , an embodiment provided by the present utility model: a layout structure of an access manhole for the overhaul access tunnel of a water conveyance tunnel, including a diversion tunnel 1 and a construction access tunnel 3, and a side diversion wall 2 is arranged at the intersection position of the diversion tunnel 1 and the construction access tunnel 3. The head loss under the power generation condition during the operation of the power station is reduced as much as possible to ensure the smoothness of the overhaul passage and facilitate the overhaul. One end of the construction access tunnel 3 connected to the diversion tunnel 1 slopes upward, and the inclination angle is 45° - 60°. The head loss is further reduced, and the adverse impact of this project on the water energy utilization efficiency is eliminated as much as possible.

[0028] Please refer to the drawings in the specification Figure 1 and Figure 2 , a reserved orifice 6 is opened at the intersection of the diversion tunnel 1 and the construction access tunnel 3, and an access manhole 4 is opened inside the construction access tunnel 3. The width of the reserved orifice 6 is equal to the width of the access manhole 4. It neither affects the normal overhaul passage nor further reduces the head loss.

[0029] Please refer to the drawings in the specification Figure 1 , Figure 2 and Figure 3 , a water sealing gate 7 is arranged on the side of the access manhole 4 close to the diversion tunnel 1, a hollow plug 5 is arranged on the side of the water sealing gate 7 far from the diversion tunnel 1, and a concrete slope surface 8 is poured on the outside of the hollow plug 5. Thus, it is convenient for maintenance personnel to enter and exit the inside of the construction access tunnel 3. A through hole matching the access manhole 4 is opened inside the hollow plug 5. Thus, the stability can be enhanced, and the convenience and safety of the overhaul are improved.

[0030] Working principle: During use, a reserved orifice 6 is left at the intersection of the water diversion tunnel 1 and the construction branch tunnel 3. At the same time, an access door orifice 4 is opened inside the construction branch tunnel 3 and a water sealing gate 7 is installed. After the power station operates, the construction branch tunnel 3 can be used as a maintenance tunnel, facilitating the operation and maintenance personnel to enter the inside of the construction branch tunnel 3 through the access door orifice 4, and then enter the inside of the water diversion tunnel 1 through the reserved orifice 6 for maintenance, improving the convenience during maintenance. At the same time, through the coordinated setting of the side diversion wall 2, the head loss under the power generation condition during the operation of the power station is reduced as much as possible, ensuring the smoothness of the maintenance passage and facilitating the maintenance personnel to carry out maintenance.

[0031] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A water diversion tunnel inspection branch tunnel access door arrangement structure, comprising a water diversion tunnel (1) and a construction branch tunnel (3), characterized in that: A reserved opening (6) is provided at the intersection of the diversion tunnel (1) and the construction branch tunnel (3), an entry door opening (4) is provided inside the construction branch tunnel (3), and a water-sealing gate (7) is provided on a side of the entry door opening (4) close to the diversion tunnel (1).

2. The water conveyance tunnel maintenance branch tunnel access door arrangement structure according to claim 1, characterized in that: A side guide wall (2) is provided at the junction of the water diversion tunnel (1) and the construction branch tunnel (3).

3. The water conveyance tunnel maintenance branch tunnel access door arrangement structure according to claim 1, characterized in that: A hollow blocking body (5) is provided on the side of the water sealing gate (7) away from the water diversion tunnel (1), and a through hole matching the entrance door opening (4) is provided inside the hollow blocking body (5).

4. The water conveyance tunnel maintenance branch tunnel access door arrangement structure according to claim 3, characterized in that: A concrete slope surface (8) is cast on the outer side of the hollow blocking body (5).

5. The water conveyance tunnel maintenance branch tunnel access door arrangement structure according to claim 1, characterized in that: One end of the construction branch tunnel (3) connected to the water diversion tunnel (1) is inclined upward, and the inclination angle is 45° to 60°.

6. The water conveyance tunnel maintenance branch tunnel access door arrangement structure according to claim 1, characterized in that: The width of the reserved opening (6) is equal to the width of the entrance opening (4).

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