A hydraulic tunnel plugging body and construction method

Abstract

The present invention discloses a hydraulic tunnel plugging body and a construction method, including a concrete plugging body and a tunnel body; the tunnel body is provided with a plugging position, the bottom of the plugging position is a plane, the upstream cross-section of the water flow at the plugging position is larger than the downstream cross-section of the water flow at the plugging position, the bottom of the plugging position is a concrete leveling layer, the side walls and top of the plugging position are inclined toward the center from upstream to downstream, and the shape of the concrete plugging body is adapted to the shape of the plugging position. This technology utilizes the principle of bottle plugs to cast an extruded concrete plugging body that can slide in a small range, which greatly saves the casting time of the concrete plugging body and solves the problems of long casting time and complex process of the existing diversion tunnel plugging body; at the same time, the concrete plugging body in this technology utilizes the principle of bottle plug structure, which can also make the pressure of the concrete plugging body act evenly on the surrounding rock, giving play to the advantages of concrete pressure resistance, so that the bearing capacity of the surrounding rock is fully utilized.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic construction, and in particular relates to a hydraulic tunnel plugging body and a construction method. Background Art

[0002] When building high dams on rivers in canyon areas, tunnels are generally used for diversion. As a temporary structure, the diversion tunnel must be completely sealed after its function is completed. As a component of the dam's water retaining structure, the sealing body has strict requirements on the time and process of sealing.

[0003] The common practice at present is: after the gate of the diversion tunnel is closed, the water in the tunnel is drained, and a temporary block is first cast upstream of the permanent block. Under its protection, the permanent block is cast in layers according to the process standards of the concrete gravity dam, and the cooling water pipe is pre-buried. After the pouring is completed, while cooling, the top arch is backfilled and grouted, and the surrounding area is consolidated. After 3 to 4 months, when the concrete reaches the allowable temperature for joint grouting, the joint contact grouting is carried out. Under such strict process requirements, the construction period of the block is generally more than 5 months. The problems with the traditional process are: (1) The gate must be closed as soon as possible after the flood season ends, and the time margin for selection is not large. (2) The block is designed according to the stability requirements of the gravity dam, and the length is long, which does not give full play to the bearing capacity of the surrounding rock. Summary of the invention

[0004] The invention provides a hydraulic tunnel plugging body and a construction method, which solves the problems of long pouring time and complicated process of the existing diversion tunnel plugging body.

[0005] The technical solution adopted by the present invention is:

[0006] A hydraulic tunnel plugging body comprises a concrete plugging body and a tunnel body; the tunnel body is provided with a plugging position, the bottom of the plugging position is a plane, the upstream cross-section of the water flow at the plugging position is larger than the downstream cross-section of the water flow at the plugging position, the bottom of the plugging position is a concrete leveling layer, and the side walls and / or top of the plugging position are inclined toward the center from upstream to downstream; the shape of the concrete plugging body is adapted to the shape of the plugging position. In order to completely solve the problems of long construction period and uneven force of the plugging body, this technology uses the principle of bottle plug to cast an extruded concrete plugging body that can slide in a small range. Compared with the traditional concrete plugging body, the concrete plugging body in this technology can have a certain amount of retraction gap between it and the tunnel body. After these gaps are put into use in the later period, in the initial operation, as the internal temperature of the concrete gradually decreases, the concrete plugging body is gradually separated from the surrounding area, and slides downstream under the action of the upstream water pressure, and transmits the water pressure to the surrounding rock; as time goes by, the plugging body and the surrounding area are squeezed tighter and tighter, forming a permanent water retaining structure; therefore, when casting the concrete plugging body in this technology, there is no need to wait until the concrete is completely set before the secondary casting and backfilling grouting, which greatly saves the casting time of the concrete plugging body and solves the problems of long casting time and complex process of the existing diversion tunnel plugging body; at the same time, the concrete plugging body in this technology uses the principle of bottle plug structure, which can also make the pressure of the concrete plugging body act evenly on the surrounding rock, which can give play to the advantages of concrete pressure resistance and make the surrounding rock's bearing capacity fully exerted.

[0007] Furthermore, an aluminum plate is provided on the bottom surface of the blocking position. By providing the aluminum plate on the bottom surface of the blocking position, it is possible to prevent the concrete from being connected with the bottom concrete of the blocking position during pouring and being unable to move under water pressure, resulting in poor blocking.

[0008] Furthermore, the inner wall of the plugging position is provided with a cationic emulsified asphalt layer. Cationic emulsified asphalt is processed by a special process using a variety of surfactants, cationic shale inhibitors and asphalt with a certain range of softening points; its micron-sized positively charged asphalt particles are easily adsorbed on negatively charged solid particles, participate in the formation of mud cakes, and improve the quality of mud cakes. Its particles and cationic shale inhibitors can adhere and aggregate with each other in the gap, thereby playing the role of plugging, bridging, anti-swelling and anti-collapse.

[0009] Furthermore, a drainage steel pipe is provided between the concrete plugging body and the aluminum plate; the drainage steel pipe is provided with a valve. The drainage steel pipe is provided to discharge water seeping from upstream during the pouring of the concrete plugging body, thereby avoiding affecting the construction of the concrete plugging body. By providing a valve, after the concrete plugging body is poured, the drainage channel can be closed by the valve, and then the channel can be backfilled with grouting to form a permanent concrete plugging body.

[0010] Furthermore, a water stop is circumferentially arranged between the concrete plugging body and the tunnel body. When the concrete plugging body is squeezed, the circumferentially arranged water stop is deformed under the squeeze, so that the water stop effect is better.

[0011] Furthermore, the water stop member includes a GB water stop material, which is arranged on the side wall of the concrete plugging body close to the water-facing surface. GB water stop materials generally include GB water stop plates, GB water stop strips, etc. GB water stop materials have the characteristics of good adhesion to concrete and rubber materials, aging resistance, large deformation, etc. By arranging the GB water stop material on the side wall of the concrete plugging body, the sealing effect between the concrete plugging body and the tunnel is better.

[0012] Furthermore, the water stop includes a copper water stop, which is buried in a groove arranged circumferentially on the tunnel body. The copper water stop is also called a water stop copper sheet. During the use of the copper water stop, the corrosion resistance of the water stop copper sheet is due to the reaction of copper with oxygen in the air. Under certain conditions, the Cu produced by the anode reaction 2 O can form a complete protective film on the copper surface. 2 O is partially oxidized to CuO under the action of dissolved oxygen in water. Therefore, the oxide protective film on the copper surface has a double-layer structure, the inner layer of which is Cu 2 O, and the outer layer is made of Cu 2 O and CuO. 2 O and CuO are difficult to react in the presence of weak acids and alkalis, so this is equivalent to adding a protective film to copper. Therefore, the copper waterstop has a particularly strong anti-corrosion ability. The waterstop copper sheet is installed in the groove, and the principle of high tensile strength of the waterstop copper sheet is applied. When the hydraulic structure is deformed due to external reasons, the expansion joint of the waterstop copper sheet can buffer the deformation. At the same time, since the waterstop copper sheet is perfectly integrated with the concrete, it can also prevent the concrete project from cracking, so as to achieve the purpose of anti-seepage.

[0013] Furthermore, the water stop is located between the water-retaining surface of the concrete sealing body and 0.5 meters downstream of the water-retaining surface.

[0014] Furthermore, the blocking position has a square, semicircular or horseshoe-shaped cross section.

[0015] A construction method for a hydraulic tunnel plugging body, comprising the following operations

[0016] 1) When constructing the tunnel body, the blocking position is constructed; copper water stops are pre-buried and protected during the tunnel overcurrent period;

[0017] 2) Tunnel blocking: After the tunnel gate is closed, the water in the tunnel is drained, and then the bottom of the blocking position is leveled with concrete;

[0018] 3) After the concrete of the leveling layer reaches the strength of 3 days, the surface in contact with the concrete plugging body on the plugging position is smoothed and a layer of cationic emulsified asphalt is evenly sprayed; aluminum plates and drainage steel pipes are laid from bottom to top above the bottom of the plugging position; if the pre-buried copper water stop is intact, the protection facilities during the overcurrent period are removed; if the pre-buried copper water stop is damaged, grooves are carved on the plugging position to bury the copper water stop again;

[0019] 4) Continuously pouring concrete plugging body;

[0020] 5) After the top concrete reaches 7-day strength, backfill grouting is carried out;

[0021] 6) After the backfill grouting strength reaches the 7-day strength, close the valve of the drainage pipe and backfill the drainage steel pipe;

[0022] 7) The concrete sealing body is put into water retaining operation.

[0023] The present invention has the following advantages and beneficial effects:

[0024] 1. In order to completely solve the problems of long construction period and uneven force of the plugging body, the present invention uses the principle of bottle plug to cast an extruded concrete plugging body that can slide in a small range. Compared with the traditional concrete plugging body, the concrete plugging body in the present technology can have a certain retraction gap with the tunnel body. After these gaps are put into use in the later period, in the initial operation, as the internal temperature of the concrete gradually decreases, the concrete plugging body is gradually separated from the surrounding area, and slides downstream under the action of the upstream water pressure, and transmits the water pressure to the surrounding rock; as time goes by, the plugging body and the surrounding area are squeezed tighter and tighter, forming a permanent water retaining structure; therefore, when casting the concrete plugging body in the present technology, it is not necessary to cool the concrete in layers and grout the contact joints, which greatly saves the casting time of the concrete plugging body and solves the problems of long casting time and complicated process of the existing diversion tunnel plugging body; at the same time, the concrete plugging body in the present technology uses the principle of bottle plug structure, which can also make the pressure of the concrete plugging body act evenly on the surrounding rock, which can give play to the pressure resistance of concrete and give full play to the bearing capacity of the surrounding rock.

[0025] 2. The present invention can prevent the problem that the concrete is connected with the concrete at the bottom of the blocking position during pouring, cannot move under water pressure, and cannot exert its pressure bearing capacity by arranging an aluminum plate on the bottom surface of the blocking position; by arranging an aluminum plate at the bottom of the concrete blocking body, the freedom of the blocking body to deform in a small range downstream after natural cooling can be increased, thereby transmitting the water pressure borne by the blocking body to the surrounding rock; by arranging a valve, after the concrete blocking body is poured, the drainage channel can be closed by the valve, and then the channel can be backfilled and grouted to form a permanent concrete blocking body;

[0026] 3. The present invention arranges water-stopping parts around the concrete plugging body. When the concrete plugging body is squeezed, the water-stopping parts arranged in the annular direction are deformed under the extrusion, so that the anti-seepage effect is better. During the use of copper water-stopping, the corrosion resistance of the water-stopping copper sheet is due to the reaction of copper with oxygen in the air. Under certain conditions, the Cu generated by the anode reaction 2 O can form a complete protective film on the copper surface. 2 O is partially oxidized to CuO under the action of dissolved oxygen in water. Therefore, the oxide protective film on the copper surface has a double-layer structure, the inner layer of which is Cu 2 O, and the outer layer is made of Cu 2 O and CuO. 2 O and CuO are difficult to react in the presence of weak acids and alkalis, so this is equivalent to adding a protective film to copper. Therefore, the copper waterstop has a particularly strong anti-corrosion ability. The waterstop copper sheet is installed in the expansion joint of the hydraulic structure, and the principle of the high tensile strength of the waterstop copper sheet is applied. When the hydraulic structure is deformed due to external reasons, the expansion joint of the waterstop copper sheet can buffer the deformation. At the same time, since the waterstop copper sheet is perfectly integrated with the concrete, it can also prevent the concrete project from cracking, so as to achieve the purpose of anti-seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Marks and corresponding parts names in the attached drawings:

[0030] 1-concrete sealing body, 2-tunnel body, 3-sealing position, 4-aluminum plate, 5-water stop, 6-concrete leveling layer. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be understood that the terms first, second, etc. are only used to distinguish descriptions and should not be understood as indicating or implying relative importance. Although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit without departing from the scope of the exemplary embodiments of the present invention.

[0033] It should be understood that the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another relationship between associated objects, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0034] It should be understood that in the description of the present invention, the terms "upper", "vertical", "inside", "outside" and the like indicate orientations or positional relationships that are customarily placed when the product of the invention is used, or are orientations or positional relationships that are customarily understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] It should be understood that when an element is referred to as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the opposite meaning. It should also be understood that the terms "include", "comprise", "include", and / or "comprising" when used herein specify the existence of the claimed features, integers, steps, operations, units and / or components, and do not exclude the existence or increase of one or more other features, quantities, steps, operations, units, components and / or their combinations.

[0038] Embodiment 1:

[0039] like Figure 1 As shown, this embodiment provides a hydraulic tunnel plugging body, including a concrete plugging body 1 and a tunnel body 2; the tunnel body 2 is provided with a plugging position 3, the bottom of the plugging position 3 is a plane, the upstream cross-section of the water flow of the plugging position 3 is larger than the downstream cross-section of the water flow of the plugging position 3, the bottom of the plugging position 3 is a concrete leveling layer 6, and the side wall and / or top of the plugging position 3 is inclined toward the center from upstream to downstream; the shape of the concrete plugging body 1 is adapted to the shape of the plugging position 3.

[0040] Preferably, a cationic emulsified asphalt layer is provided on the inner wall of the blocking position 3. The thickness of the cationic emulsified asphalt layer is 10 to 15 mm.

[0041] Preferably, an aluminum plate 4 is provided on the bottom surface of the blocking position 3. In specific implementation, the thickness of the aluminum plate can be 1 to 2 mm.

[0042] Preferably, a drainage steel pipe is provided between the concrete plugging body 1 and the aluminum plate, and the drainage steel pipe is provided with a valve.

[0043] Preferably, a water stop member 5 is circumferentially arranged downstream of the water retaining surface of the concrete sealing body 1 .

[0044] Preferably, the water stop member 5 comprises a GB water stop material, and the GB water stop material is arranged on the side wall of the concrete sealing body 1 close to the water facing surface.

[0045] Preferably, the water stop 5 is a copper water stop, which is buried in a groove arranged circumferentially on the tunnel body 2 .

[0046] Preferably, the water stop member 5 is located between the water retaining surface of the concrete sealing body 1 and 0.5 meters downstream of the water retaining surface.

[0047] During specific implementation, the blocking position 3 has a square, semicircular or horseshoe-shaped cross section.

[0048] The construction method of hydraulic tunnel plugging body includes the following operations

[0049] 1) The blocking position is constructed when the tunnel body is constructed; copper water stops are pre-buried and protected during the tunnel overcurrent period; the protection measures mainly use shielding objects for shielding.

[0050] 2) Tunnel blocking: After the tunnel gate is closed, the water in the tunnel is drained, and then the bottom of the blocking position is leveled with concrete;

[0051] 3) After the concrete of the leveling layer reaches the strength of 3 days, the surface in contact with the concrete plugging body on the plugging position is smoothed and a layer of cationic emulsified asphalt is evenly sprayed; aluminum plates and drainage steel pipes are laid from bottom to top above the bottom of the plugging position; if the pre-buried copper water stop is intact, the protection facilities during the overcurrent period are removed; if the pre-buried copper water stop is damaged, grooves are carved on the plugging position to bury the copper water stop again;

[0052] 4) Continuously pouring concrete plugging body;

[0053] 5) After the top concrete reaches 7-day strength, backfill grouting is carried out;

[0054] 6) After the backfill grouting strength reaches the 7-day strength, close the valve of the drainage pipe and backfill the drainage steel pipe;

[0055] 7) The concrete sealing body is put into water retaining operation.

[0056] Example 2

[0057] A hydraulic tunnel plugging body comprises a concrete plugging body 1 and a tunnel body 2; the tunnel body 2 is provided with a plugging position 3, the water flow upstream cross section of the plugging position 3 is larger than the water flow downstream cross section of the plugging position; the bottom of the plugging position 3 is an inclined surface, the upstream of the plugging position 3 is higher than the downstream of the bottom of the plugging position 3, and the shape of the concrete plugging body 1 is adapted to the shape of the plugging position 3. An aluminum plate 4 is provided on the bottom surface of the plugging position 3, a drainage steel pipe is provided between the concrete plugging body 1 and the aluminum plate, and a valve is provided on the drainage steel pipe. A water stop 5 is provided circumferentially downstream of the water retaining water face of the concrete plugging body 1, and the water stop 5 is a copper water stop, which is buried in a groove provided circumferentially on the tunnel body 2, and the water stop 5 is located between the water retaining water face of the concrete plugging body 1 and 0.5 meters downstream of the water retaining water face.

[0058] The difference between this embodiment and embodiment 1 is that the bottom of the blocking position is different. The inclined bottom surface of the blocking position can make the blocking body easier to slide. However, for the casting of the blocking body, it should be noted that the inclination of the bottom surface of the blocking position 3 should not be too large, and the gravity component of the concrete blocking body in the inclined direction should be smaller than the friction between the bottom surface of the concrete blocking body and the surface of the blocking position.

[0059] To sum up, in order to completely solve the problems of long construction period and uneven force existing in the sealing body, the present invention utilizes the principle of bottle plugs to cast an extruded concrete sealing body that can slide in a small range. Compared with the traditional concrete sealing body, the concrete sealing body in the present technology can have a certain retraction gap with the tunnel body. After these gaps are put into use in the later period, in the initial operation, as the internal temperature of the concrete gradually decreases, the concrete sealing body is gradually separated from the surrounding area, and slides downstream under the action of the upstream water pressure, and transmits the water pressure to the surrounding rock; as time goes by, the sealing body and the surrounding area are squeezed tighter and tighter, forming a permanent water retaining structure; therefore, when casting the concrete sealing body in the present technology, there is no need to wait until the concrete is completely set before performing secondary casting and backfilling grouting, which greatly saves the casting time of the concrete sealing body and solves the problems of long casting time and complicated process of the existing diversion tunnel sealing body; at the same time, the concrete sealing body in the present technology utilizes the principle of bottle plug structure, which can also make the pressure of the concrete sealing body act evenly on the surrounding rock, can give play to the pressure resistance of concrete, and make the bearing capacity of the surrounding rock fully exerted.

[0060] By setting an aluminum plate on the bottom surface of the plugging position, it can be prevented that the concrete is connected with the bottom concrete of the plugging position during pouring, and cannot move under water pressure, resulting in poor plugging. By setting an aluminum plate at the bottom of the concrete plugging body, the degree of freedom of the concrete plugging body to deform downstream after natural cooling can be increased, and the concrete plugging body can be successfully moved and plugged under the action of water pressure. By setting a valve, after the concrete plugging body is poured, the drainage channel can be closed through the valve, and then the channel can be backfilled and grouted to form a permanent concrete plugging body.

[0061] By setting water stoppers around the concrete plugging body, when the concrete plugging body is squeezed, the water stoppers set in the annular direction are deformed under the extrusion, so that the anti-seepage effect is better; by using copper water stoppers, the corrosion resistance of the water stop copper sheet during use comes from the reaction of copper with oxygen in the air. Under certain conditions, the Cu produced by the anode reaction 2 O can form a complete protective film on the copper surface. 2 O is partially oxidized to CuO under the action of dissolved oxygen in water. Therefore, the oxide protective film on the copper surface has a double-layer structure, the inner layer of which is Cu 2 O, and the outer layer is made of Cu 2 O and CuO. 2O and CuO are difficult to react in the presence of weak acids and alkalis, so this is equivalent to adding a protective film to copper. Therefore, the copper waterstop has a particularly strong anti-corrosion ability. The waterstop copper sheet is installed in the expansion joint of the hydraulic structure, and the principle of the high tensile strength of the waterstop copper sheet is applied. When the hydraulic structure is deformed due to external reasons, the expansion joint of the waterstop copper sheet can buffer the deformation. At the same time, since the waterstop copper sheet is perfectly integrated with the concrete, it can also prevent the concrete project from cracking, so as to achieve the purpose of anti-seepage.

[0062] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a hydraulic tunnel plugging body, characterized in that: The hydraulic tunnel plugging body comprises a concrete plugging body (1) and a tunnel body (2); the tunnel body (2) is provided with a plugging position (3); the bottom of the plugging position (3) is a plane; the upstream cross-section of the water flow of the plugging position (3) is larger than the downstream cross-section of the water flow of the plugging position (3); the bottom of the plugging position (3) is a concrete leveling layer (6); the side wall and / or the top of the plugging position (3) are inclined toward the center from upstream to downstream; the shape of the concrete plugging body (1) is adapted to the shape of the plugging position (3); The realization of the hydraulic tunnel plugging body includes the following operations: 1) When constructing the tunnel body, the blocking position is constructed; copper water stops are pre-buried and protected during the tunnel overcurrent period; 2) Tunnel blocking: After the tunnel gate is closed, the water in the tunnel is drained, and then the bottom of the blocking position is leveled with concrete; 3) After the concrete of the leveling layer reaches the strength of 3 days, the surface in contact with the concrete plugging body at the plugging position shall be smoothed and evenly sprayed with a layer of cationic emulsified asphalt; aluminum plates and drainage steel pipes shall be laid from bottom to top above the bottom of the plugging position; if the pre-buried copper water stop is intact, the protection facilities during the overcurrent period shall be removed; if the pre-buried copper water stop is damaged, grooves shall be carved on the plugging position to bury the copper water stop again; 4) Continuously pour the concrete plugging body; 5) After the top concrete reaches 7-day strength, backfill grouting is carried out; 6) After the backfill grouting strength reaches the 7-day strength, close the valve of the drainage pipe and backfill the drainage steel pipe; 7) The concrete sealing body is put into water retaining operation.

2. A construction method for a hydraulic tunnel plugging body according to claim 1, characterized in that: A drainage steel pipe is provided between the concrete sealing body (1) and the aluminum plate (4); the drainage steel pipe is provided with a valve.

3. The construction method of a hydraulic tunnel plugging body according to claim 1, characterized in that: A water stopper (5) is circumferentially arranged between the concrete sealing body (1) and the tunnel body (2).

4. A construction method for a hydraulic tunnel plugging body according to claim 3, characterized in that: The water stop member (5) comprises a GB water stop material, and the GB water stop material is arranged on the side wall of the concrete sealing body (1) close to the water facing surface.

5. The construction method of a hydraulic tunnel plugging body according to claim 3, characterized in that: The water stop member (5) comprises a copper water stop, and the copper water stop is buried in a groove arranged in an annular direction on the tunnel body (2).

6. A construction method for a hydraulic tunnel plugging body according to claim 3, characterized in that: The water stop member (5) is located between the water retaining surface of the concrete sealing body (1) and 0.5 meters downstream of the water retaining surface.

7. The construction method of a hydraulic tunnel plugging body according to claim 3, characterized in that: The blocking position (3) has a square, semicircular or horseshoe-shaped cross section.

Images