Hydraulic sediment removal facilities in the stone collection pit of the water diversion tunnel

Abstract

The present invention relates to a hydraulic sand removal facility for a stone collection pit in a water diversion tunnel, and belongs to the technical field of water diversion tunnel structure design for a hydropower station developed by water diversion. The present invention ingeniously utilizes a hydraulic automatic sand removal system arranged in a construction branch tunnel of the water diversion tunnel, that is, a sand flushing orifice is arranged immediately downstream of the stone collection pit, and the sand flushing orifice converges into a sand flushing channel and turns to enter the bottom of the construction branch tunnel blocking body; a sand flushing gate is arranged behind the blocking body, and a sand discharge channel is formed by partially excavating the construction branch tunnel behind the gate, and the other half is used as a traffic access road. When there is a lot of sand and gravel deposited in the stone collection pit, there is no need to shut down the power station to empty the tunnel and manually enter the tunnel to clean the sand and gravel in the stone collection pit. It only needs to open the sand flushing gate, and use the water pressure difference of the gate to discharge the sand and gravel in the stone collection pit out of the tunnel. The present invention is very conducive to the removal of sand and gravel in the tunnel stone collection pit, and at the same time avoids the safety risk of manually entering the tunnel to remove sand and gravel after the power station is shut down, greatly improving the power generation efficiency of the power station.

Description

Technical Field

[0001] The invention relates to a hydraulic sand removal facility for a water diversion tunnel stone collection pit, belonging to the technical field of water diversion tunnel structure design of a hydropower station developed by water diversion type. Background Art

[0002] In order to concentrate the water head, the diversion tunnels of the diversion hydropower station are generally longer. In recent years, shotcrete + anchor support is more commonly used as a permanent support method in tunnel sections with better surrounding rock, and reinforced concrete lining is only used in tunnel sections with poorer surrounding rock. The shotcrete of the tunnel supported by shotcrete anchor cannot completely prevent cracking and falling during operation. In addition, diversion hydropower stations are often built on rivers in mountainous areas with heavy sediment content. The water inlet of the tunnel cannot completely prevent sediment from entering the tunnel. Therefore, this type of tunnel often has one or more stone collection pits in the tunnel to intercept the falling blocks of shotcrete, sand and gravel entering the water inlet, and uncleaned construction waste. The stone collection pit is generally a rectangular cross-section, and a metal partition is generally set on the top. The water flow drives the sand and gravel to flow along the bottom of the tunnel, and the sand and gravel easily fall into the pit and deposit. The outside of the pit is the standard section of the tunnel, and the stone collection pit does not affect the flow state of the water in the tunnel. See Figure 1 .

[0003] In the above scheme, the sand and gravel deposited in the stone collection pit cannot be automatically discharged from the tunnel. The hydropower station needs to shut down and empty the tunnel, open the sealed door of the construction branch tunnel, enter the tunnel for manual dredging, and clean the sand and gravel deposited in the stone collection pit and transport it out of the tunnel. The traditional method not only requires shutdown and loss of power generation, but also requires a lot of manpower, and the working conditions are poor, which poses a great safety hazard. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a hydraulic sand removal facility for a stone collecting pit in a water diversion tunnel, which can discharge sand and stone deposited in the stone collecting pit without stopping the machine or without emptying the tunnel after stopping the machine.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a hydraulic sand discharge facility for a stone collecting pit in a water diversion tunnel, including a water diversion tunnel, a stone collecting pit is arranged on the bottom plate of the water diversion tunnel, the middle part of the water diversion tunnel is connected with a construction branch tunnel, the construction branch tunnel is provided with a construction branch tunnel blocking body at its connecting end with the water diversion tunnel, the stone collecting pit is arranged on the upstream side of the connecting part of the water diversion tunnel and the construction branch tunnel, one or more sand flushing holes are arranged at the end of the stone collecting pit, and the back of the sand flushing holes converges into a sand flushing channel, the sand flushing channel turns to enter the bottom of the construction branch tunnel blocking body, the sand flushing channel is provided with a sand flushing gate on the downstream side of the construction branch tunnel blocking body, and a sand discharge channel is arranged at the downstream end of the sand flushing gate.

[0006] Furthermore, the water flows behind the multiple sand flushing holes converge into a sand flushing channel.

[0007] Furthermore, a traffic access road is arranged beside the sand discharge road.

[0008] The beneficial effects of the present invention are as follows: the hydraulic automatic sand discharge system is cleverly arranged in the construction branch tunnel of the water diversion tunnel, that is, a sand flushing orifice is set immediately downstream of the stone collecting pit, and the sand flushing orifices converge into a sand flushing channel and turn to enter the bottom of the construction branch tunnel blocking body; a sand flushing gate is set behind the blocking body, and the construction branch tunnel is partially excavated behind the gate to form a sand discharge channel, and the other half is used as a traffic access road. When there is a lot of sand and gravel deposited in the stone collecting pit, there is no need to shut down the power station to empty the tunnel and manually enter the tunnel to clean the sand and gravel in the stone collecting pit. It is only necessary to open the sand flushing gate and use the water pressure difference of the gate to discharge the sand and gravel in the stone collecting pit out of the tunnel. The present invention is very conducive to the removal of sand and gravel in the tunnel stone collecting pit, and at the same time avoids the safety risk of manually entering the tunnel to remove sand and gravel after the power station is shut down, greatly improving the power generation efficiency of the power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the prior art.

[0010] Figure 2 It is a schematic diagram of the plan layout of the present invention.

[0011] Figure 3 It is a schematic longitudinal section view of the present invention.

[0012] Markings in the figure: 1-water diversion tunnel, 2-stone collection pit, 3-construction branch tunnel, 4-construction branch tunnel sealing body, 5-sand flushing hole, 6-sand flushing channel, 7-sand flushing gate, 8-sand discharge channel, 9-steel partition. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 As shown, the present invention includes a water diversion tunnel 1, a stone collecting pit 2 is arranged on the bottom plate of the water diversion tunnel 1, a construction branch tunnel 3 is connected to the middle of the water diversion tunnel 1, and a construction branch tunnel plugging body 4 is arranged at the connection end of the construction branch tunnel 3 with the water diversion tunnel 1, the stone collecting pit 2 is arranged on the upstream side of the connection part of the water diversion tunnel 1 and the construction branch tunnel 3, and one or more sand flushing holes 5 are arranged at the end of the stone collecting pit 2, and the sand flushing holes 5 converge into a sand flushing channel 6 behind the sand flushing holes 5, and the sand flushing channel 6 turns to enter the bottom of the construction branch tunnel plugging body 4, and the sand flushing channel 6 is provided with a sand flushing gate 7 on the downstream side of the construction branch tunnel plugging body 4, and a sand discharge channel 8 is arranged at the downstream end of the sand flushing gate 7. The sand flushing channel 6 and the sand flushing gate 7 are arranged behind the stone collecting pit. Through monitoring, when a lot of sand and stone debris are deposited in the stone collecting pit 2, the sand flushing gate 7 is opened, and the sand and stone in the stone collecting pit 2 can be discharged out of the cave by using the water pressure difference before and after the gate.

[0015] In order to make the structure simple and reliable, the backs of the multiple sand flushing holes 5 converge into a sand flushing channel 6. The specific number of the sand flushing holes 5 is designed according to the scale of the tunnel.

[0016] For the convenience of operation and maintenance of the sand flushing gate 7, a traffic access road is provided on the side of the sand discharge road 8. During construction, the sand discharge road 8 is formed by partially excavating the construction branch hole 3, and the other half is used as a traffic access road.

Claims

1. A hydraulic sediment removal facility for a stone collecting pit in a diversion tunnel, comprising a diversion tunnel (1), a stone collecting pit (2) being arranged on the bottom plate of the diversion tunnel (1), a construction branch tunnel (3) being connected to the middle of the diversion tunnel (1), and a construction branch tunnel plugging body (4) being arranged at the connecting end of the construction branch tunnel (3) and the diversion tunnel (1), characterized in that: A stone collecting pit (2) is arranged at the upstream side of the connection between the water diversion tunnel (1) and the construction branch tunnel (3); one or more sand flushing holes (5) are arranged at the end of the stone collecting pit (2); the sand flushing holes (5) converge into a sand flushing channel (6) behind the sand flushing holes (5); the sand flushing channel (6) turns to enter the bottom of the construction branch tunnel plugging body (4); a sand flushing gate (7) is arranged on the downstream side of the construction branch tunnel plugging body (4); and a sand discharge channel (8) is arranged at the downstream end of the sand flushing gate (7).

2. The hydraulic sediment removal facility for the water diversion tunnel stone collection pit according to claim 1, characterized in that: The multiple sand flushing openings (5) converge into a sand flushing channel (6) at the rear.

3. The hydraulic sediment removal facility for the stone collecting pit of a water diversion tunnel according to claim 1 or 2, characterized in that: A traffic path is arranged beside the sand discharge road (8).

Images