CN111411980A - A water conveyance tunnel lining structure and construction method capable of withstanding high internal and external water pressure - Google Patents

Abstract

The invention provides a water-conveying tunnel lining structure capable of bearing high internal and external water pressure and a construction method, wherein the structure comprises an outer lining layer and an inner lining layer, wherein the inner lining layer consists of a first lining, a high-strength force-transmission water-permeable grid and a second lining; wherein, the outer lining layer is arranged on the inner wall of the water delivery tunnel; the inner wall of the outer lining layer is provided with the first inner lining, and grouting is carried out between the outer lining layer and the first inner lining to form a grouting layer, and the grouting layer and the outer lining layer form an integrated outer lining layer; the high-strength force transmission water permeable grating is arranged on the inner wall of the first lining; and a second lining is arranged on the inner wall of the high-strength force-transmission water-permeable grid. The water delivery tunnel lining structure provided by the invention strictly controls the overhigh internal and external water pressure which can be possibly born by the lining within an allowable range, avoids the risk of internal water leakage caused by tensile cracking of the lining, simultaneously eliminates the hidden trouble of buckling, deformation and instability of the lining caused by high external water pressure in the emptying period, and fundamentally solves the safety problem of operation of the high internal and external water pressure tunnel lining structure.

Description

A water conveyance tunnel lining structure and construction method capable of withstanding high internal and external water pressure

technical field

The invention belongs to the field of water conservancy and hydropower, and relates to a water conveyance tunnel lining structure and a construction method, in particular to a water conveyance tunnel lining structure and a construction method that can withstand high internal and external water pressures.

Background technique

With my country's economic and social development, the demand for electricity and the peak-to-valley difference in electricity consumption continue to increase, users' requirements for power supply quality continue to increase, and the large-scale development of random and intermittent new energy sources, as well as the increasing demand for emergency backup and adjustment, have increased the demand for hydropower stations. development has put forward higher requirements. In recent years, pumped storage power station, as a power station with high flexibility, not only has the functions of peak regulation, phase regulation and backup of conventional power stations, but also converts low-cost electric energy into high-yield peak load energy. , so as to achieve the efficient use of energy.

The mechanism of hydroelectric power generation is to guide the water stored in the dam to the generator through the tunnel pipeline, as shown in Figure 1, to convert the potential energy into kinetic energy and then into electrical energy. Usually, this kind of tunnel has the characteristics of high internal and external water pressure. Especially in the pumped storage power station project, the operating water head has grown from 500m to 800m or even higher. The high internal and external water pressure diversion tunnel is the key control "throat" project of the pumped storage power station, and its safe operation is related to the whole Project construction and the safety of life and property of the surrounding people. Generally, thin-walled steel pipes are installed inside the tunnels for water diversion tunnels. The steel pipes not only need to withstand the high internal water pressure during the water filling period, the high external water pressure of the mountain water during the venting period, and the deformation load of the surrounding rock, etc. At present, when the traditional thin-walled steel pipe is emptied in the internal water, the thin-walled steel pipe may be buckling and deformed due to the water pressure outside the mountain, which has caused great difficulties in the construction and safe operation of the pumped storage power station. Therefore, when designing the water-conducting steel pipe, it is necessary to consider the damage under the action of the external water pressure when venting while considering the internal water pressure, and in order to prevent landslides and other disasters, it is also necessary to consider the structure type that avoids the external seepage of the internal water. In order to improve the ability of water-conducting tunnels to resist external water pressure, on the one hand, it can be considered to increase the ability to withstand external water pressure by affecting the design by the height and spacing of reinforcement; In terms of internal pressure, there will be excess design, which is uneconomical and wasteful.

Therefore, according to the actual geological structure and structural mechanics mechanism, it is necessary to develop an economical and applicable new type of lining structure type for the water conduction tunnel of the pumped storage power station that can withstand high internal and external water pressures, so as to realize the structural design that reasonably withstands the internal and external water pressures. The excessive internal and external water pressure that the lining may bear is strictly controlled within the allowable range to avoid the risk of internal water seepage caused by the lining cracking under tension, and at the same time eliminate the hidden danger of buckling deformation and instability of the lining caused by high external water pressure during the venting period, and fundamentally solve the problem. The safety of the operation of the tunnel lining structure with high internal and external water pressure provides scientific and technological support for breaking through the technical bottleneck of the pumped storage power station industry and promoting the healthy and rapid development of the industry.

SUMMARY OF THE INVENTION

In order to solve the above problems, the purpose of the present invention is to provide a water conveyance tunnel lining structure that can withstand high internal and external water pressure. The risk of internal water seepage caused by the lining cracking under tension, at the same time, eliminates the hidden danger of buckling deformation and instability of the lining caused by high external water pressure during the venting period, and fundamentally solves the safety problem of the operation of the tunnel lining structure with high internal and external water pressure.

Another object of the present invention is to provide a construction method for the above-mentioned water conveyance tunnel lining structure that can withstand high internal and external water pressure.

In order to achieve the above purpose, the present invention provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure, comprising an outer lining layer and an inner lining layer, the inner lining layer is composed of a first inner lining, a high-strength force-transmitting permeable grille and a second lining layer. Two inner linings;

Wherein, the outer lining layer is arranged on the inner wall of the water conveyance tunnel;

The inner wall of the outer lining layer is provided with the first inner lining, and grouting is performed between the outer lining layer and the first inner lining to form a grouting layer, and the grouting layer and the outer lining layer form an integrated outer lining layer;

The high-strength force-transmitting water-permeable grille is arranged on the inner wall of the first lining;

A second lining is arranged on the inner wall of the high-strength force-transmitting permeable grille.

Preferably, the outer lining layer is concrete or concrete segments.

Preferably, the first inner lining is a steel lining cylinder, a stiffening rib steel cylinder, a PVC pipe, a reinforced ring steel cylinder or a carbon fiber composite steel cylinder.

Preferably, the second lining is plain concrete, prestressed concrete, reinforced concrete, or concrete segment.

Preferably, the high-strength force-transmitting water-permeable grid is a glass fiber reinforced plastic grid or a high-strength steel-plastic geogrid.

Preferably, a plurality of water valves are pierced through the second inner liner.

Preferably, the inner wall of the second inner liner is provided with a roughness reduction coating, and a plurality of water valves are passed through the second inner liner and the roughness reduction coating, and the roughness reduction coating is a silicone coating or Fluorocarbon paint coating.

Preferably, the inner wall of the second inner liner is provided with an impermeable coating, and the impermeable coating is a polyurea elastomer coating.

The present invention also provides the above-mentioned construction method for the lining structure of a water conveyance tunnel that can withstand high internal and external water pressure, comprising the following steps:

1) The tunnel is excavated by TBM or NATM blasting, and then bolts are driven into the surrounding rock of the tunnel to reinforce the surrounding rock;

In the water conveyance tunnel project, the surrounding rock of the water conveyance tunnel is reinforced with bolts before construction, and then the subsequent construction of the lining structure is carried out. Drilling the bolt deeper can play a role in strengthening the surrounding rock of the tunnel.

2) Pouring or spraying concrete on the surrounding rock, or installing concrete segments to form an outer lining layer;

3) Install the first inner lining, then grouting between the first inner lining and the outer lining layer, and bonding the outer lining layer and the grouting layer to form an integrated outer lining;

4) Lay high-strength force-transmitting permeable grille on the inner wall of the first lining;

5) Lay a second lining on the inner wall of the high-strength force-transmitting permeable grille.

Further, adding step 6) setting or prefabricating multiple water valves on the second lining;

Or, step 6) coating a roughness reduction coating on the inner wall of the inner lining layer, and then setting or prefabricating a plurality of water valves on the second inner lining and the roughness reduction coating;

Or, step 6) coating an impermeable layer on the inner wall of the second liner.

The characteristics of the present invention are:

In the present invention, after the first inner lining is installed, grouting is performed between the outer lining layer and the first inner lining, so that the outer lining layer and the grouting layer formed by grouting are bonded into an integrated lining, so that the first inner lining and the outer lining can be avoided. A gap is created between the linings causing movement of the lining.

When the second lining is a well-cast concrete structure, the surface is smooth and there are no pits, and the roughness reduction coating can be chosen not to be applied; If the degree is not high, there will be potholes. For example, at the joints of the segments, a roughness reduction coating needs to be applied to prevent the erosion under the high-speed water flow from damaging the structure of the concrete or segment.

In the prior art, in order to solve the buckling deformation damage of the lining structure of the water conveyance tunnel caused by high internal and external water pressure, in the case of using steel material (steel pipe) as the lining, the thickness of the steel pipe wall needs to be increased to 40-80mm, of which 40mm is located at the elevation. The higher part (near the water storage dam end, the external water pressure is low), 80mm is located in the lower elevation part (near the generator end, the external water pressure is high), so that the steel material can withstand high internal and external water pressure, but When the internal and external water pressure is unbalanced, the huge water pressure difference will still cause the buckling deformation of the steel material, thereby affecting the safety and stability of the inner lining concrete structure. In the present invention, the supporting action of the second inner lining is transmitted to the steel pipe by arranging a high-strength force-transmitting permeable grille, so as to prevent the steel pipe from buckling and deforming, thereby reducing the thickness of the steel lining cylinder.

In the present invention, a water valve that can pass water in both directions can be further arranged on the second inner lining layer, so that when a water pressure difference occurs between the internal and external water pressure, the internal water can flow into the high-strength transmission permeable grille through the water valve or from the high-strength transmission. The force permeable grid flows into the inner lining layer, so that the inner water pressure and the outer water pressure of the second inner lining are almost in a balanced state, which can prevent the concrete of the second inner lining from being damaged by a large pressure difference.

In the structure of the present invention, because the concrete supports the steel pipe through the high-strength force transmission grid, the steel pipe is prevented from being deformed and buckled.

The beneficial effects of the present invention are:

The invention provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure. The water conveyance tunnel lining structure strictly controls the high internal and external water pressure that the lining may bear within an allowable range, and prevents the lining from being stretched and cracked to cause internal water seepage. At the same time, it eliminates the hidden danger of buckling deformation and instability of the lining caused by high external water pressure during the venting period, and fundamentally solves the safety problem of the operation of the high internal and external water pressure tunnel lining structure. At the same time, the above structure can reduce the thickness of the lined steel pipe (40-80mm to 10-40mm), reduce the amount of steel, reduce the cost of raw materials, transportation costs, and reduce the difficulty of construction.

Description of drawings

FIG. 1 is a schematic diagram of the existing water storage dam guiding the water storage dam to the generator through the tunnel pipeline.

FIG. 2 is a schematic diagram of a lining structure of a water conveyance tunnel that can withstand high internal and external water pressure according to a preferred embodiment of the present invention.

3 is a schematic diagram of the lining structure of a water conveyance tunnel that can withstand high internal and external water pressure according to another preferred embodiment of the present invention.

FIG. 4 is a schematic diagram of the lining structure of a water conveyance tunnel that can withstand high internal and external water pressure according to a third preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of the lining structure of a water conveyance tunnel that can withstand high internal and external water pressure according to the fourth preferred embodiment of the present invention.

reference number

1: Outer lining layer; 2: First lining; 3: High-strength force-transmitting permeable grille; 4: Second lining; 5: Grouting layer; 6: Surrounding rock; 7: Anchor rod; 8: Water valve; 9 : Roughness reduction coating; 10: Anti-seepage coating.

Detailed ways

The embodiments of the present invention will be described in detail and complete below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

Setting means that in the case of poured concrete, the concrete can be opened by tools after pouring, and the water valve can be installed; prefabrication means that if the lining is prefabricated in a factory other than the construction site, it can be prefabricated in advance. Reserve the water valve.

TBM is a full-section tunnel boring machine. The hard rock TBM uses the hob on the rotary cutter head to squeeze and shear the rock, pick up the gravel through the bucket teeth on the rotary cutter head, and fall on the main belt conveyor to transport it backwards. Then, the slag is transported to the outside of the tunnel by the traction slag truck or the tunnel continuous belt conveyor.

NATM is the English abbreviation of New Austrian Law. The new Austrian method is a construction method based on the experience of tunnel engineering and the theory of rock mechanics, combining bolts and shotcrete as the main supporting means. Obtained the patent right and officially named it. NATM is inseparable from underground engineering, and the new Austrian method has almost become a basic method for building tunnels in areas with weak and broken surrounding rock.

Because the compressive strength of concrete with different grades is also different, the scope of application in engineering is also different. In hydraulic engineering, concrete with the grade of C25-C50 is mostly used, but the concrete with different grades will also affect the project cost. In order to ensure the safety of the lining structure of the water conveyance tunnel, different grades of concrete will also have an impact on the lining structure when selecting concrete, and the construction method will also have an impact on the lining structure.

The raw materials used in the present invention are all marketed commodities, and the processes not described in detail are all conventional processes in the field.

Example 1

This embodiment provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure, including an outer lining layer 1 and an inner lining layer;

The inner lining layer is composed of a first inner lining 2, a high-strength force-transmitting permeable grille 3 and a second inner lining 4;

Wherein, the outer lining layer 1 is arranged on the inner wall of the water conveyance tunnel;

The inner wall of the outer lining layer 1 is provided with the first inner lining 2, and grouting is performed between the outer lining layer 1 and the first inner lining 2 to form a grouting layer 5. The grouting layer and the outer lining layer form an integrated outer lining layer. lining;

The high-strength force-transmitting permeable grille 3 is arranged on the inner wall of the first lining 2;

A second lining 4 is arranged on the inner wall of the high-strength force-transmitting permeable grille 3 .

In this embodiment, shotcrete is used for the outer lining layer, steel lining cylinder is used for the first inner lining, glass fiber reinforced plastic grating is used for the high-strength force-transmitting permeable grid, and prestressed concrete is used for the second inner lining.

The construction method is:

1) The tunnel is excavated by TBM, and then bolts 7 are driven into the surrounding rock 6 of the tunnel to reinforce the surrounding rock 6;

In the water conveyance tunnel project, it is conventionally necessary to reinforce the surrounding rock of the water conveyance tunnel with bolts before construction, and then carry out the subsequent construction of the lining structure.

2) Pour or spray concrete on the surrounding rock to form the outer lining layer 1;

3) install the first inner lining 2, then grouting is performed between the first inner lining 2 and the outer lining layer 1, and the outer lining layer 1 and the grouting layer 5 are bonded to form an integrated outer lining;

4) Lay high-strength force-transmitting permeable grille 3 on the inner wall of the first lining 2;

5) Lay a second lining 4 on the inner wall of the high-strength force-transmitting permeable grille 3 .

When the second inner lining is made of prestressed concrete with good workability, good buckling deformation and anti-seepage effects can be achieved.

When the structure of this embodiment is adopted, the second inner lining directly bears the internal water pressure, and the first inner lining does not directly bear the inner water pressure. At the same time, because the first inner lining is supported by the second inner lining through the high-strength force-transmitting permeable grille At this time, when the first liner is a steel liner, the thickness can be reduced, about 20mm-40mm.

Example 2

This embodiment provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure, including an outer lining layer 1 and an inner lining layer;

The inner lining layer is composed of a first inner lining 2, a high-strength force-transmitting permeable grille 3 and a second inner lining 4;

Wherein, the outer lining layer 1 is arranged on the inner wall of the water conveyance tunnel;

The inner wall of the outer lining layer 1 is provided with the first inner lining 2, and grouting is performed between the outer lining layer 1 and the first inner lining 2 to form a grouting layer 5. The grouting layer and the outer lining layer form an integrated outer lining layer. lining;

The high-strength force-transmitting permeable grille 3 is arranged on the inner wall of the first lining 2;

A second lining 4 is arranged on the inner wall of the high-strength force-transmitting permeable grille 3;

A plurality of water valves 8 are passed through the second lining 4 .

In this embodiment, the outer lining layer is the attached segment, the first inner lining is a reinforced steel cylinder ring, the high-strength force-transmitting permeable grid is a glass fiber reinforced plastic grid, and the second inner lining is a reinforced concrete.

The construction method is:

1) The tunnel is excavated by NATM blasting, and then bolts 7 are driven into the surrounding rock 6 of the tunnel to reinforce the surrounding rock 6;

In the water conveyance tunnel project, it is conventionally necessary to reinforce the surrounding rock of the water conveyance tunnel with bolts before construction, and then carry out the subsequent construction of the lining structure.

2) Pour or spray concrete on the surrounding rock to form the outer lining layer 1;

3) install the first inner lining 2, then grouting is performed between the first inner lining 2 and the outer lining layer 1, and the outer lining layer 1 and the grouting layer 5 are bonded to form an integrated outer lining;

4) Lay high-strength force-transmitting permeable grille 3 on the inner wall of the first lining 2;

5) Lay the second lining 4 on the inner wall of the high-strength force-transmitting permeable grille 3;

6) A plurality of water valves 8 are provided on the second lining 4

In this embodiment, when the first lining is made of steel cylinder, since the steel cylinder is supported by the second lining through the high-strength force-transmitting permeable grid, the buckling of the steel cylinder can be avoided; The grid and the second lining form a dynamic balance, that is: when the second lining is in a water-filled state, the water inside the second lining flows into the permeable grille to protect the second lining from being damaged by the inner water pressure; When the second inner lining is not filled with water, the water in the high-strength force-transmitting permeable grid flows into the inner lining, and the high-strength force-transmitting permeable grid does not have to be in a water storage state all the time. This arrangement makes it possible to protect the second inner lining through the balance of water pressure when the second inner lining is made of a material with lower strength such as plain concrete.

The number of water valves is designed according to the actual stress of the pipeline. Generally, it is set in the place where the tensile stress of the pipeline is large, that is, the top and bottom of the lining.

When the structure of this embodiment is adopted, due to the balance of water pressure on both sides of the second lining, the safety of the second lining is improved, and the number of steel cylinders supported by the second lining through the high-strength force-transmitting permeable grille can also be reduced. Thickness to 10-30mm.

Example 3

This embodiment provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure, including an outer lining layer 1 and an inner lining layer;

The inner lining layer is composed of a first inner lining 2, a high-strength force-transmitting permeable grille 3 and a second inner lining 4;

Wherein, the outer lining layer 1 is arranged on the inner wall of the water conveyance tunnel;

The inner wall of the outer lining layer 1 is provided with the first inner lining 2, and grouting is performed between the outer lining layer 1 and the first inner lining 2 to form a grouting layer 5. The grouting layer and the outer lining layer form an integrated outer lining layer. lining;

The high-strength force-transmitting permeable grille 3 is arranged on the inner wall of the first lining 2;

A second lining 4 is arranged on the inner wall of the high-strength force-transmitting permeable grille 3 .

The inner wall of the second inner liner is provided with a roughness reduction coating 9 , and a plurality of water valves 8 are passed through the second inner lining 4 and the roughness reduction coating 9

In this embodiment, the outer lining layer is sprayed concrete, the first inner lining layer is a stiffening rib steel cylinder, the high-strength force-transmitting water-permeable grid is a high-strength steel-plastic geogrid, the second lining layer is plain concrete, and the roughness reduction coating is used. For silicone coating.

The construction method is:

1) The tunnel is excavated by NATM blasting, and then bolts 7 are driven into the surrounding rock 6 of the tunnel to reinforce the surrounding rock 6;

In the water conveyance tunnel project, it is conventionally necessary to reinforce the surrounding rock of the water conveyance tunnel with bolts before construction, and then carry out the subsequent construction of the lining structure.

2) Pour or spray concrete on the surrounding rock to form the outer lining layer 1;

3) install the first inner lining 2, then grouting is performed between the first inner lining 2 and the outer lining layer 1, and the outer lining layer 1 and the grouting layer 5 are bonded to form an integrated outer lining;

4) Lay high-strength force-transmitting permeable grille 3 on the inner wall of the first lining 2;

5) Lay the second lining 4 on the inner wall of the high-strength force-transmitting permeable grille 3;

6) Coating a roughness reduction coating 9 on the inner wall of the inner lining layer, and then prefabricating a plurality of water valves 8 on the second inner lining layer and the roughness reduction coating.

In this embodiment, a roughness-reducing coating is added compared with Embodiment 2 to solve the problem that the inner wall of the second lining is not smooth due to the use of shotcrete or the laying of concrete segments. If the inner wall is not smooth, the water flow will be blocked, and the pressure of the water flow at the blocked place will increase, which will cause erosion damage to the second lining. Affect the safety of the entire lining structure. At the same time, as in Embodiment 2, in this embodiment, when the first inner lining is a steel cylinder, the thickness of the steel cylinder can be reduced to 10-30 mm.

Example 4

This embodiment provides a water conveyance tunnel lining structure that can withstand high internal and external water pressure, including an outer lining layer 1 and an inner lining layer;

The inner lining layer is composed of a first inner lining 2, a high-strength force-transmitting permeable grille 3 and a second inner lining 4;

Wherein, the outer lining layer 1 is arranged on the inner wall of the water conveyance tunnel;

The inner wall of the outer lining layer 1 is provided with the first inner lining 2, and grouting is performed between the outer lining layer 1 and the first inner lining 2 to form a grouting layer 5. The grouting layer and the outer lining layer form an integrated outer lining layer. lining;

The high-strength force-transmitting permeable grille 3 is arranged on the inner wall of the first lining 2;

A second lining 4 is arranged on the inner wall of the high-strength force-transmitting permeable grille 3 .

An impermeable coating 10 is provided on the inner wall of the second inner liner 4 .

In this embodiment, the outer lining layer is sprayed concrete, the first inner lining layer is a steel lining cylinder, the high-strength force-transmitting permeable grid is a glass fiber reinforced plastic grid, the second inner lining is prestressed concrete, and the impermeable coating is Polyurea elastomer coating.

The construction method is:

1) The tunnel is excavated by NATM blasting, and then bolts 7 are driven into the surrounding rock 6 of the tunnel to reinforce the surrounding rock 6;

In the water conveyance tunnel project, it is conventionally necessary to reinforce the surrounding rock of the water conveyance tunnel with bolts before construction, and then carry out the subsequent construction of the lining structure.

2) Pour or spray concrete on the surrounding rock to form the outer lining layer 1;

3) install the first inner lining 2, then grouting is performed between the first inner lining 2 and the outer lining layer 1, and the outer lining layer 1 and the grouting layer 5 are bonded to form an integrated outer lining;

4) Lay high-strength force-transmitting permeable grille 3 on the inner wall of the first lining 2;

5) Lay the second lining 4 on the inner wall of the high-strength force-transmitting permeable grille 3;

6) Coating an impermeable layer on the inner wall of the second liner.

When the structure of this embodiment is adopted, the second inner lining directly bears the internal water pressure without a water valve, and the first inner lining does not directly bear the inner water pressure. The grid is supported, and the thickness of the first lining can be reduced to about 1mm-20mm when the first lining is a steel lining.

It can be seen from the above embodiments that the present invention provides a water conveyance tunnel lining structure that can withstand high internal and external water pressures. The risk of internal water seepage caused by the lining cracking under tension, at the same time, eliminates the hidden danger of buckling deformation and instability of the lining caused by high external water pressure during the venting period, and fundamentally solves the safety problem of the operation of the tunnel lining structure with high internal and external water pressure.

Claims (10)

1. A water-conveying tunnel lining structure that can withstand high internal and external water pressures, comprising an outer lining layer and an inner lining layer, is characterized in that: the inner lining layer is composed of a first inner lining, a high-strength force-transmitting permeable grille and a second inner lining. lining composition; Wherein, the outer lining layer is arranged on the inner wall of the water conveyance tunnel; The inner wall of the outer lining layer is provided with the first inner lining, and grouting is performed between the outer lining layer and the first inner lining to form a grouting layer, and the grouting layer and the outer lining layer form an integrated outer lining layer; The high-strength force-transmitting water-permeable grille is arranged on the inner wall of the first lining; A second lining is arranged on the inner wall of the high-strength force-transmitting permeable grille. 2 . The lining structure of a water conveyance tunnel capable of withstanding high internal and external water pressures according to claim 1 , wherein the outer lining layer is concrete or concrete segments. 3 . 3. The water conveyance tunnel lining structure capable of withstanding high internal and external water pressure as claimed in claim 1, wherein the first lining is a steel lining cylinder, a stiffening rib steel cylinder, a PVC pipe, and a reinforced ring steel cylinder Or carbon fiber composite steel drum. 4 . The lining structure of a water conveyance tunnel capable of withstanding high internal and external water pressures according to claim 1 , wherein the second lining is plain concrete, prestressed concrete, reinforced concrete, or concrete segment. 5 . 5 . The lining structure of a water conveyance tunnel capable of withstanding high internal and external water pressures as claimed in claim 1 , wherein the high-strength force-transmitting water-permeable grille is a glass fiber reinforced plastic grille or a high-strength steel-plastic geogrid. 6 . 6. The lining structure of a water conveyance tunnel capable of withstanding high internal and external water pressures according to any one of claims 1 to 5, wherein the second lining is provided with a plurality of water valves. 7. The water conveyance tunnel lining structure capable of withstanding high internal and external water pressures according to any one of claims 1 to 5, wherein the inner wall of the second lining is provided with a roughness reduction coating, and the second The inner lining and the roughness reduction coating pass through a plurality of water valves, and the roughness reduction coating is an organic silicon coating or a fluorocarbon paint. 8. The water conveyance tunnel lining structure capable of withstanding high internal and external water pressures according to any one of claims 1 to 5, wherein the inner wall of the second lining is provided with an anti-seepage coating, and the anti-seepage coating is provided with an anti-seepage coating. The layer is a polyurea elastomer coating. 9. The construction method of the water conveyance tunnel lining structure that can withstand high internal and external water pressure as claimed in any one of claims 1-5, is characterized in that, comprises the following steps: 1) The tunnel is excavated by TBM or NATM blasting, and then bolts are driven into the surrounding rock of the tunnel to reinforce the surrounding rock; 2) Pouring or spraying concrete on the surrounding rock, or installing concrete segments to form an outer lining layer; 3) Install the first inner lining, then grouting between the first inner lining and the outer lining layer, and bonding the outer lining layer and the grouting layer to form an integrated outer lining; 4) Lay high-strength force-transmitting permeable grille on the inner wall of the first lining; 5) Lay a second lining on the inner wall of the high-strength force-transmitting permeable grille. 10. The construction method of the lining structure of a water conveyance tunnel that can withstand high internal and external water pressure as claimed in claim 9 is characterized in that, for the lining structure of the water conveyance tunnel of claim 6, step 6) is added in the second inner Lining or prefabricating multiple water valves; Or, for the water conveyance tunnel lining structure of claim 7: step 6) coating a roughness reduction coating on the inner wall of the inner lining layer, and then setting the second inner lining and the roughness reduction coating or Prefabricated multiple water valves; Or, for the water conveyance tunnel lining structure of claim 8, step 6) coating an anti-seepage layer on the inner wall of the second inner lining.

Images