Gallery sealing device and method for hydropower underground engineering construction period

Abstract

The invention belongs to the technical field of dust prevention and noise reduction in the construction period of a building, and particularly relates to a corridor sealing device and method in the construction period of hydropower underground engineering. The device comprises an air film door seal, a fixing structure, an inlet and outlet assembly and an inflation assembly. The method comprises the steps that the fixing structure and the inlet and outlet assembly are installed at the underground engineering gallery hole, the gas film is cut and connected according to the shape and profile design of the hole and the inlet and outlet assembly, dehumidification gas is inflated through the inflation assembly, constant pressure is kept, a barrier body is formed, and the hole is closed, and the gas film skirt edge with the wrinkle structure and the rock wall are sealed. Personnel and vehicles enter and exit through the entrance and exit assembly or the non-fully-fixed door seal. Compared with a traditional rigid door seal, the rock wall working face can be effectively sealed without fine chiseling and grinding, propagation of harmful gas and noise can be blocked, the interference range is reduced, and the rigid door seal has the advantages of being efficient in sealing, easy to construct, capable of being stored, resistant to collision, low in cost and the like.

Description

Technical Field

[0001] This invention belongs to the field of dust and noise reduction technology during construction, and particularly relates to a corridor enclosure device and method during the construction of underground hydropower projects. Background Technology

[0002] During the construction phase of underground hydropower projects, frequent excavation, blasting, and mechanical operations often result in underground spaces filled with high-decibel noise, dust, and exhaust fumes from fuel-powered equipment. To protect the health of workers and meet the cleanliness and quietness requirements of specific areas, it is usually necessary to seal off and isolate certain corridors or openings.

[0003] Enclosure and isolation in this field relies on traditional rigid sealing technologies, such as steel doors, rigid barriers, or roller shutters. However, the characteristics of underground hydroelectric engineering projects lie in the fact that the area around the tunnel entrance is usually the original excavated rock wall, with an uneven surface, significant bumps and depressions, and irregular shape. Existing technologies have limitations when using rigid sealing in this situation: to ensure a proper seal between the rigid door frame and the rock wall, construction workers must chisel and level the rock wall around the entrance. This process not only consumes a large amount of manpower and resources, but the chiseling itself also generates new dust and noise pollution. Even after treatment, gaps inevitably remain between the rigid door frame and the rock surface, leading to dust and noise leakage and failing to achieve effective isolation. Furthermore, rigid sealing is cumbersome to disassemble and transport, making it difficult to adapt to the frequently changing sealing needs during hydroelectric engineering construction.

[0004] Relevant patent documents retrieved: Publication country: China, Publication number: CN202108114U, Authorization announcement date: January 11, 2012. This document discloses an installation structure for an opening in a cable-stayed air-supported membrane structure. It mainly relates to the field of air-supported membrane structures. Its technical solution includes an outer membrane, several first cables, and foundation connectors. The outer membrane is positioned below the first cables and has openings. By setting a reversing plate to change the direction of the cables, the stress of the membrane around the opening is transferred to the cables and ultimately to the foundation connectors, thereby solving the stress concentration problem caused by openings in the air-supported membrane.

[0005] The prior art represented by the aforementioned documents has at least the following unresolved technical problems or defects: Although the aforementioned patent documents involve air film and hole structure, their technical concepts and application scenarios are fundamentally different from those of this invention.

[0006] The technical solution in this document is based on a pre-established building foundation, such as a ground ring beam. It does not address how the edges of the air-supported membrane can be sealed to uneven rock walls. Its structure is unsuitable for the complex cross-sectional shape and rough contact surfaces of underground corridors. Furthermore, the air-supported membrane fixation in this document relies on conventional foundation connectors, lacking any accommodating gaps designed to accommodate uneven rock walls. If directly applied to hydroelectric corridors, the edges of the air-supported membrane cannot fill the gaps in the rock surface, necessitating costly rock wall leveling procedures—precisely what this field seeks to avoid.

[0007] Furthermore, existing technologies are typically designed for permanent or semi-permanent buildings and do not take into account the special needs of rapid installation, welding-free operation, and easy disassembly during the construction of water and electricity systems.

[0008] Therefore, there is still an urgent need in this field for a new type of corridor enclosure device and method that can eliminate the requirement for fine grinding of the working surface of the rock wall and use the active deformation capability of the structure to adapt to the irregular rock wall contour; at the same time, through a specific structure, it can achieve efficient dust prevention, noise reduction and gas isolation without the need for complex civil construction, so as to solve the problems of high construction difficulty and poor sealing effect of existing rigid door seals. Summary of the Invention

[0009] In order to solve at least one of the above-mentioned technical problems in the prior art, the present invention provides a corridor closure device and method during the construction period of hydropower underground engineering.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows:

[0011] In a first aspect, the present invention provides a corridor closure device and method for underground hydropower engineering construction, comprising: an air-supported membrane door seal, a fixing structure, an entrance / exit assembly, and an inflation assembly; The fixed structure and entrance / exit components are installed on the rock walls and ground at the entrance of the underground engineering corridor. The fixed structure includes a rigid frame extending along the outline of the corridor entrance. The air-supported membrane door seal is designed according to the shape of the corridor opening and entrance / exit components, and the edge of the air-supported membrane door seal is connected to the fixed structure; The inflation component is connected to the air membrane door seal and is used to inflate gas into the air membrane door seal and maintain air pressure to form a barrier body to seal the opening. The main frame of the fixed structure includes two parallel and spaced angle steels, with an accommodating gap between the two angle steels; The air-supported membrane door seal has a skirt with a pleated structure around its four edges; The skirt is filled into the receiving gap and expands under the action of air pressure inside the air film door seal, thereby squeezing between the angle steel and the working surface of the rock wall at the entrance of the corridor to achieve a seal.

[0012] Furthermore, the two angle steels are arranged in a double-track manner, and each angle steel includes a horizontal side and a vertical side; The two horizontal edges of the angle steel are laid inward in a symmetrical manner, and the horizontal edges of the angle steel are fixed to the working surface of the rock wall. The accommodating gap is located between the vertical edges of the two angle steels, and the width of the accommodating gap is 20 cm to 40 cm. The skirt edge is in direct contact with the working surface of the rock wall through the accommodating gap.

[0013] Furthermore, the air-supported membrane door seal is an air-ribbed or air-pillow membrane structure, with a cavity formed between the two membrane layers, and the average thickness of the cavity is 30-50 cm. The outer wall of the air-supported membrane gate is attached with a mesh cable, and the ends of the mesh cable are provided with anchoring components. The fixed structure is provided with a number of connectors, and the anchoring assembly is connected to the connectors.

[0014] Furthermore, the fixing structure includes a ground beam fixing structure, a tunnel wall fixing structure, and an entrance / exit fixing structure; The ground beam fixing structure is installed in a trench opened in the ground; The cave wall fixing structure is laid according to the shape of the rock wall at the entrance of the corridor, including an arched fixing structure and a side wall fixing structure; The entrance / exit fixing structure is connected to the ground beam fixing structure or the tunnel wall fixing structure.

[0015] Furthermore, it also includes an inlet / outlet assembly disposed within the area of ​​the air-supported membrane gate seal; The entrance / exit assembly includes a door frame, an evacuation door is installed inside the door frame, and the door frame is sealed by being covered with aluminum panels. The door frame is divided in the vertical direction into an upper equipment mounting cavity and a lower passage cavity; The equipment installation cavity has a reserved channel for installing orifice blocks, which are used to install through-wall pipelines or equipment.

[0016] Furthermore, the inflation assembly includes a pressurizing fan, a dehumidifier, and a control module; The dehumidifier is located at the air inlet of the pressurizing fan; the control module is used to monitor the air pressure inside the air membrane door seal and control the pressurizing fan to automatically replenish the pressure.

[0017] Secondly, the present invention also provides a method for closure of corridors during the construction period of underground hydropower projects, comprising the following steps: S1: Construction site preparation: Perform simple treatment on the rock walls around the entrance of the underground engineering corridor, remove protruding rocks to form a working surface for the rock wall, and measure the cross-sectional dimensions; S2: Material processing: Process the fixed structure and air-supported membrane door seal according to the measured dimensions, and cut out the skirt edge of the air-supported membrane door seal; S3: Installation of fixing structure: trenches are dug in the ground to install ground beam fixing structure, and cave wall fixing structure is installed on the rock wall, so that the two angle steels are arranged in parallel to form a accommodating gap; S4: Install the air-supported membrane door seal: Fix the air-supported membrane door seal to the fixed structure, and fill the skirt into the receiving gap formed by the two angle steels; S5: Inflation and sealing: Activate the inflation component to inflate the air membrane door seal, and use the air pressure to expand the skirt and tightly squeeze it between the angle steel and the working surface of the rock wall to achieve a seal.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention discloses a corridor sealing device during the construction of underground hydropower projects. It utilizes a flexible air-supported membrane skirt with a pleated structure. The skirt expands due to internal air pressure after inflation, thus tightly pressing and adhering to the uneven rock face. This sealing method far surpasses the traditional airtightness effect, allowing for efficient sealing of the rock face without the need for time-consuming and laborious fine grinding. Its advantages are particularly significant when dealing with irregularly shaped arched corridors.

[0019] 2. This invention discloses a corridor closure device during the construction period of underground hydropower projects. The device's fixing structure and entrance / exit components are all characterized by standardized components, and the entire process uses conventional mechanical fixing (such as self-tapping screws and anchor bolts), eliminating the need for welding. The prefabricated construction process has low requirements for on-site operating conditions. This makes the device not only easy to assemble and disassemble quickly, but also reusable, greatly saving building materials and construction time.

[0020] 3. This invention discloses a corridor enclosure device for underground hydropower construction. Compared with traditional steel roller shutters, the air-supported membrane door seal of this invention is extremely easy to store after deflation, significantly saving space. Simultaneously, it eliminates the need for a complex top beam structure like roller shutters, thus avoiding negative impacts on vehicle clearance height limits. It is particularly suitable for corridors in hydropower projects where heavy machinery and transport vehicles frequently pass. Furthermore, the air-supported membrane material itself possesses extremely high tear and tensile strength, making it difficult to damage. In the event of an accidental collision between construction vehicles or machinery, the soft air-supported membrane provides excellent elastic cushioning, significantly reducing damage to the vehicles themselves and the attached building structures.

[0021] 4. This invention discloses a corridor enclosure device for underground hydropower construction, which provides targeted and effective isolation during the construction period, completely separating protected areas such as temporary offices from pollution sources, effectively preventing occupational hazards and interference such as noise and dust. It improves the underground environment, protects the physical and mental health of workers, and significantly reduces the energy consumption of ventilation equipment by blocking the flow of polluted air. Furthermore, in construction sites requiring heating or insulation in frigid regions, the device's cavity structure provides excellent insulation and energy-saving effects. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the sealing device provided by the present invention.

[0023] Figure 2 This is an enlarged three-dimensional structural diagram of the sealing device provided by the present invention.

[0024] Figure 3 This is a magnified front view of the enclosed device provided by the present invention.

[0025] Figure 4 This is a schematic diagram of the enlarged side view of the sealing device provided by the present invention.

[0026] Reference numerals: 1. Air-supported membrane door seal; 2. Fixing structure; 3. Entrance / exit assembly; 4. Inflatable assembly; 5. Corridor opening; 11. Air-supported membrane cavity; 12. Mesh cable; 121. Anchoring assembly; 21. Ground beam fixing structure; 22. Tunnel wall fixing structure; 221. Arch fixing structure; 222. Sidewall fixing structure; 23. Entrance / exit fixing structure; 24. Connector; 25. Angle steel; 251. Horizontal edge of angle steel; 252. Vertical edge of angle steel; 31. Doorway frame; 32. Evacuation door; 321. Observation window; 33. Aluminum single panel; 34. Steel tread; 35. Orifice block; 36. Rectangular frame; 361. First frame; 362. Second frame; 363. Third frame; 37. Vertical frame; 41. Pressurized fan; 42. Dehumidifier; 51. Rock face; 52. Temporary office; 53. Trench. Detailed Implementation

[0027] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0028] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of the invention.

[0029] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0030] Example 1 like Figures 1 to 4 As shown, this embodiment provides a sealing device for an office corridor during the construction phase of an underground hydropower project. The device is installed at the corridor entrance 5 to isolate the temporary office space 52 inside from the high-noise, high-dust construction area outside. This embodiment adopts a fully fixed enclosure design, allowing passage only for personnel or small equipment.

[0031] This device mainly consists of four parts: air-supported membrane gate 1, fixed structure 2, inlet / outlet assembly 3, and inflation assembly 4.

[0032] The fixed structure 2 is the foundation of the entire device, and it is bolted to the working surface 51 of the rock wall around the corridor entrance 5 and to the ground. The core innovation of this invention lies in the use of a double-track angle steel design for the fixed structure. The main body of the fixed structure 2 consists of two parallel hot-dip galvanized angle steels 25. (As...) Figure 2 As shown, each angle steel section includes a horizontal edge 251 that conforms to the rock face and a vertical edge 252 that stands perpendicular to the rock face. The two angle steel sections 25 are arranged parallel to the opening outline. Crucially, both horizontal edges 251 face inwards, meaning they are symmetrically laid along their center lines. A 20-40 cm wide installation gap is maintained between the two vertical edges 252. This gap is specifically designed to accommodate the skirt.

[0033] The fixed structure 2 specifically includes: a ground beam fixed structure 21 installed in the ground trench 53; a cave wall fixed structure 22 installed on the arch and sidewall rock walls (which is divided into an arched fixed structure 221 and a sidewall fixed structure 222 according to the contour of the rock wall); and an entrance and exit fixed structure 23 surrounding the entrance and exit. All these structures adopt the aforementioned double-track angle steel form, with further adaptations at the entrance and exit as needed. Evenly arranged connectors 24 are prefabricated on the vertical edges 252 of the angle steel. In this embodiment, the connectors are preferably perforated or anchored for subsequent fixing of the air-supported membrane cable.

[0034] The air-supported membrane door seal 1 adopts an air-cushion membrane structure, consisting of two layers of high-strength membrane material forming a closed air-supported membrane cavity 11. After inflation, its thickness is approximately 30-50 cm, providing excellent sound and heat insulation performance. The edges of the air-supported membrane are not flat cut edges, but rather have wide, pleated skirts. These skirts communicate with the interior of the air-supported membrane cavity 11 or serve as extensions of the membrane, and are made of a soft, wear-resistant material. The outer wall of the air-supported membrane is covered with a mesh cable 12, preferably steel wire rope in this embodiment, with anchoring components 121 at the cable ends. In the fully fixed structure, all anchoring components 121 around the air-supported membrane are connected to the connectors 24 using a fully fixed method that cannot be directly and quickly disassembled.

[0035] In the installed state, the skirt of the air-supported membrane gate 1 is filled into the receiving gap between the two angle steels 25 of the fixed structure 2. When the inflation assembly 4 operates, gas fills the air-supported membrane cavity 11 and extends to the skirt. Under the action of internal air pressure, the flexible skirt expands and deforms within the confined receiving gap, squeezing laterally and bottom. Lateral compression: The skirt expands to both sides, tightly pressing against the inner sides of the two vertical edges 252 of the angle steel.

[0036] Bottom compression: The skirt expands downwards, directly filling the gap between the two horizontal edges 251 of the angle steel, and is compressed onto the uneven working surface 51 of the rock wall. Because the skirt is flexible and wrinkled, it can perfectly conform to the pits and protrusions on the rock wall surface, thus achieving an airtight seal without the need for fine chiseling of the rock wall.

[0037] The entrance / exit component 3 is located in the center of the opening and includes a steel door frame 31. Specifically, the door frame 31 has four angle steels arranged vertically as four corner vertical skeletons 37, and three parallel rectangular skeletons 36 arranged vertically. That is, four angle steels are placed horizontally at the bottom and top to form the first skeleton 361 and the third skeleton 363, respectively, and a second skeleton 362 is placed horizontally at a height of 2.2 meters above the ground. The second skeleton divides the inner perimeter of the door frame into section E (equipment installation cavity) and section F (passage cavity) at different heights.

[0038] Inside section F, a steel tread plate 34 is installed on the upper surface of the first frame 361, and an outward-opening fire escape door 32 is installed for personnel to enter and exit. A safety glass observation window 321 is installed at the top of the escape door. Inside section E, an opening block 35 is reserved for the installation of air conditioning pipes, wall penetration pipes, etc. The door frame is covered with aluminum single panel 33 and sealed to the edge of the air membrane.

[0039] The inflation assembly 4 includes two pressurizing fans 41 (one in use and one on standby) and a dehumidifier 42. The dehumidifier 42 is located at the air inlet to ensure the dryness of the injected gas. The control module monitors the air pressure and automatically controls the fans to start and stop to maintain constant pressure.

[0040] Example 2 This embodiment provides a sealing device for a transport corridor during the construction phase of an underground hydropower project. The connecting areas of the transport corridor are undergoing rock blasting and excavation, requiring the passage of various large vehicles.

[0041] Unlike Embodiment 1, the air-supported membrane door seal 1 in this embodiment adopts a non-fully fixed sealing form. The air-supported membrane door seal is preferably an air-ribbed membrane structure, with two symmetrically installed panels, similar to a regular door curtain that can be lifted to the side and upward.

[0042] Regarding the anchoring connection method, the anchoring components 121 at the bottom edge and partial sides of the air-supported membrane are connected to the connectors 24 (anchor bolts in this embodiment) on the fixed structure 2 in a movable manner. That is, after the anchoring components are looped with the anchor bolts, no tightening nuts are added, and they can be directly and quickly released. The top and other parts are connected in a fully fixed manner. When vehicles need to pass, the bottom and sides of the air-supported membrane gate can be quickly released and opened and closed at any angle. After the vehicle passes, it can be promptly restored to the closed state with the help of cables, so as to meet the basic dust prevention and noise reduction requirements while taking into account high-frequency transportation.

[0043] Example 3 The construction method in this embodiment includes the following steps: S1: Workers only need to remove the overly sharp rocks on the surrounding rock walls of the opening 5 to form a rough working surface 51, without the need for fine leveling and polishing. Measure the cross-sectional dimensions.

[0044] S2: Factory-prefabricated double-track angle steel frame, entrance and exit frame and air-supported membrane with skirt.

[0045] S3: Excavate a shallow trench 53 in the ground and install the ground beam fixing structure 21. Drill holes in the rock wall and install expansion bolts to fix the two angle steels of the cave wall fixing structure 22, ensuring that a predetermined accommodation gap is formed between the two angle steels, and then assemble the entrance and exit components 3.

[0046] S4: Deploy the air-supported membrane and connect the anchoring assembly 121 of the mesh cable 12 to the connector 24 on the angle steel to initially fix the position of the air-supported membrane. Next, carefully fill the pleated skirt around the air-supported membrane into the receiving gap formed by the two angle steels 25.

[0047] S5: Connect the inflation component 4 and start it. As the air pressure increases, the air film inflates, and the skirt located in the gap expands rapidly, filling the gap between the angle steel and the rock wall to achieve an adaptive seal.

[0048] Through the above structure and method, this device effectively solves the problems of difficult rock wall treatment and sealing in hydropower projects, and the entire process is weld-free and modular, making it safe and environmentally friendly.

[0049] The following is an explanation of an actual construction process, specifically the above 5 steps: Step S1: 1. On-site workers simply processed the rock walls surrounding the entrance to the underground office corridor, chiseling away any protruding rocks to create the working surface, meeting the requirements for vertical and horizontal installation of the fixed structure. Relevant professionals measured the outline and cross-sectional dimensions of this working surface, serving as the design basis and construction drawings for processing the fixed structure. 2. Determine the opening size of the entrance / exit component. In this embodiment, the preferred size is 1.5. The 2.7-meter section includes a 0.5-meter-high section E and a 2.2-meter-high section F. The installation position is centered on the cross-section of the corridor opening to meet the requirements for passage and installation of the opening module.

[0050] Step S2: 1. Based on the survey drawings, the steel structure manufacturer designs and processes matching fixed structures, including secondary keels or steel subframes matching the doorway frame; the steel frame is processed in sections to meet the technical requirements of the assembly process, and connection holes are pre-drilled on the vertical sides of the angle steel. In this embodiment, the preferred hot-dip galvanized angle steel is L50. 50 5.

[0051] 2. Based on the data and drawings provided by the steel structure manufacturer, the air-supported membrane manufacturer designs and manufactures an air-supported membrane door seal that matches the opening, reserving a 40 cm thick cavity and pleated skirt edges, and preparing cables and anchoring components; the air-supported membrane manufacturer matches the inflatable components and related electrical materials such as wires and circuits, which can be directly connected to the power supply and signal devices provided on the construction site; the air-supported membrane manufacturer is responsible for providing on-site installation technical support and equipment commissioning services.

[0052] 3. Based on the specifications and drawings provided by the steel structure manufacturer, the decoration company is responsible for designing and procuring matching evacuation doors, aluminum panels, steel treads, and access panel blocks for the entrance and exit components, including wall sleeves, sound insulation filling, emergency lighting fixtures, and other related decorative components and accessories; the evacuation door size is 1.5 meters. 2.2 meters; the aluminum single-panel veneer is coated with red fluorocarbon.

[0053] All building materials described in S2 above shall be sorted, packaged, and transported to the power station construction site.

[0054] Step S3: 1. On-site workers determine the installation position of the fixed structure and lay out the lines on-site according to the dimensions and drawings in step S1.

[0055] 2. A neat trench is excavated in the ground rock to match the length of the ground angle steel, with a width of 40 cm and a depth of 5 cm, which also matches the vertical side length of the angle steel. A ground beam fixing structure, including the first skeleton of the door frame, is installed in the trench. The two do not need to be connected end to end but are spliced ​​together.

[0056] 3. Install the arched fixing structure and the side wall fixing structure, and fix the horizontal edge of the angle steel to the rock wall of the opening; the steel frame above the ground of the door frame and its connection with the first frame are all fixed by bolts to form a stable frame structure.

[0057] 4. The decoration company is responsible for installing the decorative aluminum panels and fire doors on the door frame, as well as the wall sleeves, sound insulation cotton filling, emergency lighting fixtures, and related circuit and signal line installation.

[0058] Step S4: 1. Under the guidance of the air-supported membrane manufacturer, the on-site workers installed the anchoring components on the steel frame of the fixed structure and completed the corresponding connection methods according to the different installation positions of the air-supported membrane door seal.

[0059] 2. Fill the gap between the two horizontal edges of the air-supported membrane skirt.

[0060] 3. Install the inflatable components inside the enclosed space of the office corridor.

[0061] Step S5: 1. Based on the basis and drawings described in S1, the on-site workers will connect the pressurizing fan, dehumidifier and control module to the existing circuit and signal system of the enclosed space in a conventional manner.

[0062] 2. Start the pressurizing fan and dehumidifier to fill the air membrane cavity with dehumidified and purified air. The control module intelligently adjusts the operation of the pressurizing fan. After the air membrane reaches the design pressure, it maintains constant pressure to form a barrier and seal the opening. The skirt relies on air pressure to squeeze together with each steel frame and rock wall in different shapes to achieve sealing.

[0063] The steel connection and fixing processes described above all use conventional self-tapping screws, anchors, or stainless steel expansion bolts; the assembly of the door frame and the covering of the aluminum panels also preferably use prefabricated connectors, and are installed using conventional construction techniques; the related circuits and signal lines are laid out and connected using conventional electrical connection methods; there is no welding process on the construction site.

[0064] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A corridor closure device during the construction period of underground hydropower projects, characterized in that: include: Air-supported membrane door seal, fixing structure, inlet / outlet components, and inflation components; The fixed structure and entrance / exit components are installed on the working face of the rock wall and the ground at the entrance of the underground engineering corridor. The fixed structure includes a main frame extending along the outline of the corridor entrance. The air-supported membrane door seal is designed according to the shape of the corridor opening and entrance / exit components, and the edge of the air-supported membrane door seal is connected to the fixed structure; The inflation component is connected to the air membrane door seal and is used to inflate gas into the air membrane door seal and maintain air pressure to form a barrier body to seal the opening. The main frame of the fixed structure includes two parallel and spaced angle steels, with an accommodating gap between the two angle steels. The air-supported membrane door seal has a skirt with a pleated structure around its four edges; The skirt is filled into the receiving gap and expands under the action of air pressure inside the air film door seal, thereby squeezing between the angle steel and the working surface of the rock wall at the entrance of the corridor to achieve a seal.

2. The corridor closure device during the construction period of a hydropower underground project according to claim 1, characterized in that: The two angle steels are arranged in a double-track manner, and each angle steel includes a horizontal side and a vertical side; The two horizontal edges of the angle steel are laid inward in a symmetrical manner, and the horizontal edges of the angle steel are fixed to the working surface of the rock wall. The accommodating gap is located between the vertical edges of the two angle steels, and the width of the accommodating gap is 20 cm to 40 cm. The skirt edge is in direct contact with the working surface of the rock wall through the accommodating gap.

3. The corridor closure device during the construction period of an underground hydropower project according to claim 2, characterized in that: The air-supported membrane door seal is an air-ribbed or air-pillow membrane structure. The membrane structure consists of two membrane layers, with a cavity formed between the two membrane layers. The average thickness of the cavity is 30-50 cm. The outer wall of the air-supported membrane gate is attached with a mesh cable, and the ends of the mesh cable are provided with anchoring components. The fixed structure is provided with a number of connectors, and the anchoring assembly is connected to the connectors.

4. The corridor closure device during the construction period of an underground hydropower project according to claim 1, characterized in that: The fixed structure includes a ground beam fixed structure, a tunnel wall fixed structure, and an entrance / exit fixed structure; The ground beam fixing structure is installed in a trench opened in the ground; The cave wall fixing structure is laid according to the shape of the rock wall at the entrance of the corridor, including an arched fixing structure and a side wall fixing structure; The entrance / exit fixing structure is connected to the ground beam fixing structure or the tunnel wall fixing structure.

5. A corridor closure device during the construction period of an underground hydropower project according to claim 4, characterized in that: The entrance / exit components are located within the area of ​​the air-supported membrane gate seal; The entrance / exit assembly includes a door frame, an evacuation door is installed inside the door frame, and the door frame is sealed by being covered with aluminum panels. The door frame is divided in the vertical direction into an upper equipment mounting cavity and a lower passage cavity; The equipment installation cavity has a reserved channel for installing orifice blocks, which are used to install through-wall pipelines or equipment.

6. A corridor closure device during the construction period of an underground hydropower project according to claim 1, characterized in that: The inflation assembly includes a pressurizing fan, a dehumidifier, and a control module; The dehumidifier is located at the air inlet of the pressurizing fan; the control module is used to monitor the air pressure inside the air membrane door seal and control the pressurizing fan to automatically replenish the pressure.

7. A construction method for a corridor closure device during the construction period of an underground hydropower project according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Construction site preparation: Perform simple treatment on the rock walls around the entrance of the underground engineering corridor, remove protruding rocks to form a working surface for the rock wall, and measure the cross-sectional dimensions; S2: Material processing: Process the fixed structure and air-supported membrane door seal according to the measured dimensions, and cut out the skirt edge of the air-supported membrane door seal; S3: Installation of fixing structure: trenches are dug in the ground to install ground beam fixing structure, and cave wall fixing structure is installed on the rock wall, so that the two angle steels are arranged in parallel to form a accommodating gap; S4: Install the air-supported membrane door seal: Fix the air-supported membrane door seal to the fixed structure, and fill the skirt into the receiving gap formed by the two angle steels; S5: Inflation and sealing: Activate the inflation component to inflate the air membrane door seal, and use the air pressure to expand the skirt and tightly squeeze it between the angle steel and the working surface of the rock wall to achieve a seal.

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