Maintenance channel structure of long-distance water tunnel group

Abstract

The utility model discloses an overhaul channel structure of a long-distance water delivery tunnel group, which is characterized in that water delivery tunnel construction adit is perpendicular to each cavern of the water delivery tunnel group, is crossed with each cavern of the water delivery tunnel group, penetrates through the cavern group, extends and bypasses to the position right above the tunnel group, and forms an annular structure to be crossed on the outer side of a tunnel; the water conveyance tunnel construction adit comprises a low-elevation adit section, a high-elevation adit section and a plurality of inclined tunnel sections. The water delivery tunnels are connected through the annularly-arranged construction adit, the water collection pits are connected through the structure that the water collection pits are arranged in a segmented mode and the drainage pipes are embedded in the bottom plate, the overhaul channel reaches each tunnel in the water delivery tunnel group, the overhaul conditions of the water delivery tunnels are improved, the overhaul duration is shortened, and the engineering benefits are improved; and the hydraulic connection of the water collecting pits in the tunnel is also realized, the arrangement of pumping and draining facilities in each segmented water collecting pit is avoided, the engineering investment is reduced, the operation management is convenient, and favorable conditions are created for the long-term safe operation of the water conveying tunnel.

Description

Technical Field

[0001] The utility model relates to the field of water conveyance tunnel engineering, in particular to a maintenance channel structure of a long-distance water conveyance tunnel group. Background Art

[0002] The water conveyance tunnel is located underground, and the layout of the tunnel line is mainly affected by factors such as the scale of water conveyance, water conveyance distance, water volume distribution, project investment and engineering experience. For large-flow, long-distance water conveyance tunnels, it is generally necessary to arrange them as underground cavern groups, and the water conveyance tunnels are arranged in parallel. For example, a certain water diversion hydropower has two water conveyance tunnels, which are arranged in parallel. The tunnel line length can reach 18km, and the excavation section diameter can reach 13m. Since the tunnel line length of long-distance water conveyance tunnels is long, it is necessary to set up maintenance channels along the line.

[0003] In engineering, permanent and temporary are generally considered. The maintenance passage of water conveyance tunnel is mainly arranged by using the construction branch tunnel built during the construction period. That is, the construction branch tunnel is blocked after the completion of the engineering construction, and a movable flat-push steel gate is set in the blocking body to serve as the maintenance passage of the water conveyance tunnel. When the water conveyance tunnel is under maintenance, the water conveyance tunnel is emptied, and people or dredging machinery and equipment can enter through the maintenance passage.

[0004] The layout of the maintenance passage of a single water diversion tunnel is relatively simple, and the design function can be achieved by adopting the above-mentioned engineering measures. However, the cavern groups of multiple water diversion tunnels arranged in parallel face greater layout difficulties.

[0005] Based on the above situation, the utility model proposes a maintenance channel structure for a long-distance water conveyance tunnel group to effectively solve the above problems. Utility Model Content

[0006] In order to solve the problems existing in the background technology, the utility model provides a maintenance channel structure of a long-distance water conveyance tunnel group.

[0007] The utility model adopts the following technical solutions:

[0008] A maintenance channel structure for a long-distance water conveyance tunnel group. The water conveyance tunnel construction branch tunnel is perpendicular to and crosses the various chambers of the water conveyance tunnel group. After passing through the tunnel group, it extends and detours to the top of the tunnel group, and forms a ring structure to intersect on the outside of the tunnel. The water conveyance tunnel construction branch tunnel is formed to include a low-elevation flat tunnel section, a high-elevation flat tunnel section and multiple inclined tunnel sections.

[0009] Furthermore, the low-elevation flat tunnel section vertically intersects each cavern of the water conveyance tunnel group, and the elevation of the low-elevation flat tunnel section is the same as or lower than the elevation of the bottom plate of the water conveyance tunnel.

[0010] Furthermore, the high-elevation flat tunnel section is arranged above the tunnel group, and the axis of the high-elevation flat tunnel section is perpendicular to the axis of the water transfer tunnel in the plane.

[0011] Furthermore, a maintenance passage gate is provided in the inclined tunnel section, and is connected to the high-elevation flat tunnel section. Both ends of the single inclined tunnel are connected to the flat tunnel section for vehicle passage.

[0012] Furthermore, a maintenance passage gate is provided in the sealing body on one side of each water diversion tunnel.

[0013] Furthermore, a sump is provided outside the gate of the inspection channel to collect leakage water from the surrounding rock of the blocked section or the tunnel.

[0014] Furthermore, a drainage pipe is buried in the bottom plate of the low-elevation flat tunnel section of the branch tunnel, and the elevation of the drainage pipe is lower than the inner section of the concrete lining of the bottom plate of the water transfer tunnel.

[0015] Furthermore, the drainage pipe is connected to each sump outside the gate of the maintenance channel.

[0016] Furthermore, the maintenance channel gate includes a first maintenance channel gate arranged in the sealing body at the intersection of the inner water transfer tunnel and the inclined tunnel section, and a second maintenance channel gate arranged in the sealing body at the intersection of the outer water transfer tunnel and the inclined tunnel section.

[0017] The utility model provides a maintenance channel structure for a long-distance water conveyance tunnel group: the water conveyance tunnels are connected by setting up construction branch tunnels arranged in a ring, the elevation arrangement takes into account both traffic and the stability of the cavern surrounding rock, and the water collection pits are connected by setting up collection pits in sections and the structure of pre-buried drainage pipes in the bottom plate, so that maintenance personnel can drive small vehicles to reach each tunnel in the water conveyance tunnel group through the maintenance channel reconstructed by the construction branch tunnels, which greatly improves the maintenance conditions of the water conveyance tunnels, shortens the maintenance time, and improves the project efficiency; the hydraulic connection of the water collection pits in the tunnel is realized, and it is avoided to set up pumping facilities in each of the segmented water collection pits, and the leakage water can be concentratedly discharged by gravity or pumped by water pumps, which reduces the project investment and facilitates the operation management, creating favorable conditions for the long-term and safe operation of the water conveyance tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 Section view of the middle AA plane.

[0020] The serial numbers marked in the figure are as follows: 1- inclined tunnel section, 2- first maintenance channel gate, 3- first sump, 4- inner water diversion tunnel, 5- high elevation flat tunnel section, 6- construction branch tunnel plug, 7- drainage pipe, 8- outer water diversion tunnel, 9- second maintenance channel gate, 10- second sump, 11- low elevation flat tunnel section, 12- drainage ditch, 13- maintenance channel. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] In the project, a construction branch tunnel is generally arranged to be vertically connected with each water diversion tunnel. After the water diversion tunnel is built, the construction branch tunnel chambers on both sides of the construction branch tunnel need to be blocked. Due to the blocking of each water diversion tunnel, only the outermost water diversion tunnel can be entered through the inspection channel set in the original construction branch tunnel plug 6. The water diversion tunnels on the side far away from the construction branch tunnel entrance do not have the conditions for entering from the construction branch tunnel for maintenance.

[0023] A major feature of entering the water diversion tunnel from the construction branch tunnel for maintenance is that the maintenance passage is suitable for small vehicles to drive directly into. During the maintenance period of the project, it can greatly improve the efficiency of maintenance, shorten the maintenance time, and improve the project benefits.

[0024] Refer to the attached Figure 1-2 A maintenance channel structure for a long-distance water conveyance tunnel group. The water conveyance tunnel construction branch tunnel is vertically arranged to cross the various caverns of the water conveyance tunnel group. After passing through the tunnel group, it extends and detours to the top of the tunnel group, and forms a ring structure to intersect on the outside of the tunnel. The water conveyance tunnel construction branch tunnel includes a low-elevation flat tunnel section 11, a high-elevation flat tunnel section 5 and multiple inclined tunnel sections 1.

[0025] The low-elevation horizontal tunnel section 11 vertically intersects each cavern of the water conveyance tunnel group, and the elevation of the low-elevation horizontal tunnel section 11 is the same as or lower than the elevation of the bottom plate of the water conveyance tunnel.

[0026] The high-elevation flat tunnel section 5 is arranged above the tunnel group to avoid water accumulation in the tunnel. The axis of the high-elevation flat tunnel section 5 is perpendicular to the axis of the water conveyance tunnel in the plane. The elevation of the high-elevation flat tunnel section 5 is determined according to the thickness requirements of the rock pillars between the caverns to ensure the stability and safety of the surrounding rock.

[0027] The inclined tunnel section 1 is provided with a maintenance passage gate, and is connected to the high-elevation horizontal tunnel section 5. Both ends of the single inclined tunnel are connected to the horizontal tunnel section for vehicle passage.

[0028] After the construction of the water diversion tunnel is completed, the construction branch tunnels that intersect with it are blocked. A maintenance gate is installed in the blocking body on one side of each water diversion tunnel. The maintenance gate adopts a flat-push steel gate, and the cross-sectional size needs to meet the requirements for the passage of maintenance vehicles.

[0029] The maintenance channel gate includes a first maintenance channel gate 2 arranged in the sealing body at the intersection of the inner water conveyance tunnel 4 and the inclined tunnel section 1, and a second maintenance channel gate 9 arranged in the sealing body at the intersection of the outer water conveyance tunnel 8 and the inclined tunnel section 1.

[0030] A sump is provided outside the inspection channel gate, and the sump includes a first sump 3 and a second sump 10 as shown in the figure.

[0031] Used to collect seepage water from the surrounding rock or tunnel in the sealing section.

[0032] The branch tunnel low-elevation horizontal tunnel section 11 and the inspection passage 13 are provided with drainage ditches 12 .

[0033] A drainage pipe 7 is buried in the bottom plate of the low-elevation horizontal tunnel section 11 of the branch tunnel, and the elevation of the drainage pipe 7 is lower than the inner section of the concrete lining of the bottom plate of the water conveyance tunnel. The drainage pipe 7 is connected to the water collection pits 3 and 10 outside the gate of the maintenance channel.

[0034] The drainage pipe 7 is connected to the sump 3 and sump 10 outside the gate of the inspection channel, so as to connect the leakage water in the tunnel. The leakage water is discharged centrally at the sump 10 at the outermost side of the water transfer tunnel, that is, close to the inlet side of the construction branch tunnel. If the inlet elevation of the construction branch tunnel is lower than the elevation of the bottom plate of the water transfer tunnel, the leakage water can be discharged by gravity drainage. If the inlet elevation of the construction branch tunnel is higher than the elevation of the bottom plate of the water transfer tunnel, it can be automatically pumped out by setting a water pump or other equipment in the outermost sump 10.

[0035] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A maintenance channel structure for a long-distance water transfer tunnel group, characterized in that: The construction branch tunnel of the water conveyance tunnel is perpendicular to and crosses the various chambers of the water conveyance tunnel group. After passing through the tunnel group, it extends and detours to the top of the tunnel group, and forms a ring structure to intersect on the outside of the tunnel. The construction branch tunnel of the water conveyance tunnel is formed by a low-elevation flat tunnel section, a high-elevation flat tunnel section and multiple inclined tunnel sections.

2. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 1 is characterized in that: The low-elevation flat tunnel section vertically intersects each cavern of the water conveyance tunnel group, and the elevation of the low-elevation flat tunnel section is the same as or lower than the elevation of the bottom plate of the water conveyance tunnel.

3. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 1 is characterized in that: The high-elevation flat tunnel section is arranged above the tunnel group, and the axis of the high-elevation flat tunnel section is perpendicular to the axis of the water conveyance tunnel in the plane.

4. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 1 is characterized in that: The inclined tunnel section is provided with a maintenance passage gate, and is connected to the high-elevation flat tunnel section. Both ends of the single inclined tunnel are connected to the flat tunnel section respectively for vehicle passage.

5. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 1 is characterized in that: A maintenance passage gate is provided inside the sealing body on one side of each water diversion tunnel.

6. A maintenance channel structure for a long-distance water conveyance tunnel group according to claim 4 or 5, characterized in that: A sump is provided outside the gate of the inspection channel to collect leakage water from the surrounding rock of the blocking section or the tunnel.

7. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 1 is characterized in that: A drainage pipe is buried in the bottom plate of the low-elevation flat tunnel section of the branch tunnel, and the elevation of the drainage pipe is lower than the inner section of the concrete lining of the bottom plate of the water conveyance tunnel.

8. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 7, characterized in that: The drainage pipe is connected to each sump outside the gate of the inspection channel.

9. The inspection channel structure of a long-distance water conveyance tunnel group according to claim 5, characterized in that: The inspection channel gate includes a first inspection channel gate arranged in the sealing body at the intersection of the inner water conveyance tunnel and the inclined tunnel section, and a second inspection channel gate arranged in the sealing body at the intersection of the outer water conveyance tunnel and the inclined tunnel section.

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