A waterproof and drainage structure for a corrugated steel tunnel support system and a construction method thereof

Abstract

A kind of waterproof and drainage structure for corrugated steel tunnel support system and its construction method, waterproof and drainage structure, including corrugated steel plate, annular drain pipe, advanced drain pipe, longitudinal drain pipe and the bottom drain of being set along the extension direction of tunnel, the surface of corrugated steel plate is sprayed with waterproof material, annular drain pipe is installed in filled cavity, annular drain pipe is longitudinally communicated with longitudinal drain pipe and advanced drain pipe by tee pipe, annular drain pipe, longitudinal drain pipe and advanced drain pipe are all by from outside to inside sequentially arranged plastic blind ditch, geotextile and water inlet pipe with water inlet hole, construction method is first marked laying position;Annular drain pipe, advanced drain pipe and longitudinal drain pipe are laid and connected;Corrugated steel plate is sprayed with waterproof material, and concrete is poured.The present application constructs new waterproof and drainage structure, prevents blockage, and reasonably improves drainage effect.

Description

Technical Field

[0001] This invention relates to the field of tunnel initial support technology, specifically to a drainage and waterproofing structure for corrugated steel tunnel support systems and its construction method. Background Technology

[0002] Tunnels are often located in mountainous areas where the rock mass contains a large amount of water. If proper waterproofing and drainage are not implemented, water leakage and dripping can occur, affecting traffic safety. Furthermore, the long-term erosion and corrosion of the tunnel support structure by water, especially with corrugated steel support structures, can affect the tunnel's stability and safety. In addition, in water-rich areas, timely waterproofing and drainage can ensure the smooth progress of tunnel construction, saving manpower, financial resources, and time. Therefore, tunnel waterproofing and drainage are of paramount importance.

[0003] Traditional sprayed concrete support structures are typically in a regular, arc-shaped form. In drainage systems, waterproof membranes are commonly used to drain water seeping from the rock mass. However, in the new corrugated steel support system, traditional waterproof membranes struggle to conform well to the curved surfaces of the corrugated steel plates, hindering effective rock support. Furthermore, the gaps between the waterproof membrane and the corrugated steel plate cause uneven stress on the membrane, thus affecting its lifespan.

[0004] Therefore, a completely new waterproofing and drainage structure was invented for initial support structures with special shapes, such as corrugated steel plates. This invention adopts a "point-line-surface" approach, taking points from the rock mass and using drainage pipes to promptly remove moisture from the rock mass. At the same time, it eliminates the need for traditional waterproofing boards, applying waterproofing materials by spraying or brushing onto the surface of the corrugated steel plates, creating a new type of integrated waterproofing board-support structure. This structure not only ensures the waterproof and airtight seal of the structure but also allows for a tight bond between the materials.

[0005] The traditional tunnel drainage construction process involves initial support after tunnel excavation, followed by the laying of drainage pipes after the concrete has hardened, and finally the installation of waterproofing membranes against the initial support. Because the drainage pipes are laid after the concrete has solidified, blockage is avoided. However, in construction using corrugated steel plates as initial support, to ensure better contact between the corrugated steel plates and the concrete filling layer behind them, the corrugated steel plates must be installed first, followed by the drainage pipes, and then the concrete pouring. Due to this different installation sequence compared to traditional drainage pipes, the drainage pipes are already installed when the concrete filling is poured. At this point, fine concrete debris can enter the drainage pipes through openings, causing blockages. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a drainage and waterproofing structure for a corrugated steel plate tunnel support system and its construction method. The novel drainage and waterproofing structure prevents blockages, and the rational construction improves the drainage effect.

[0007] To achieve the aforementioned technical objectives, the adopted technical solution is: a drainage structure for a corrugated steel plate tunnel support system, comprising corrugated steel plates, circumferential drainage pipes, longitudinal drainage pipes, and two bottom drainage ditches arranged along the tunnel extension direction. Multiple corrugated steel plates are connected circumferentially along the tunnel inner wall to form an arched structure. The bottom of the arched structure is supported on the tunnel floor. The arched structure and the surrounding rock of the tunnel form a cavity that can be filled with concrete. The drainage structure also includes advanced drainage pipes. Waterproof material is sprayed onto both sides of the corrugated steel plates before filling. The cavity is equipped with a circumferential drainage pipe that runs along the inner wall of the tunnel. The two ends of the circumferential drainage pipe extend into the bottom drainage ditch on the corresponding side. The circumferential drainage pipe is longitudinally connected to multiple longitudinal drainage pipes inserted into the surrounding rock of the tunnel through a T-junction. The circumferential drainage pipe is also connected to an advanced drainage pipe that is inclined towards the tunnel face and inserted into the surrounding rock of the tunnel. The circumferential drainage pipe, longitudinal drainage pipe and advanced drainage pipe are all composed of plastic blind drain, geotextile and water inlet pipe with water inlet hole. The surface of the water inlet pipe is covered with geotextile and plastic blind drain from the inside to the outside.

[0008] The water inlet hole of the present invention is filled with polyurethane filler that is dissolved in acetone after the concrete has solidified.

[0009] The advanced drainage pipe of the present invention is connected to the circumferential drainage pipe through a tee pipe, and the part where the advanced drainage pipe and the tee pipe are connected has a matching thread structure.

[0010] The corrugated steel plate and the circumferential drainage pipe of the present invention are prefabricated as an integral structure. The corrugated steel plate is provided with pipe holes for the circumferential drainage pipe to pass through, and the corrugated steel plate is provided with connecting rings for fixing and binding the circumferential drainage pipe.

[0011] The present invention has a flexible waterproof cloth wrapped around the circumferential drainage pipe, longitudinal drainage pipe and advanced drainage pipe located in the corrugated steel plate.

[0012] The corrugated steel plate of the present invention has grouting bags extending to the bottom of the tunnel at both ends on the side facing the surrounding rock, and a circumferential drainage pipe is fixed above the grouting bags.

[0013] A construction method for a drainage structure used in a corrugated steel plate tunnel support system includes the following steps: Step 1: Mark the locations of longitudinal drainage pipes, advanced drainage pipes, and corrugated steel plates on the surrounding rock. Step 2: Lay out advanced drainage pipes and excavate the tunnel; Step 3: Drill holes in the surrounding rock and install longitudinal drainage pipes; Step 4: Spray waterproof material onto the side of the corrugated steel plate facing the surrounding rock; Step 5: The circumferential drainage pipe is laid on the corrugated steel plate; Step 6: Lay corrugated steel plates on the surrounding rock, and connect the circumferential drainage pipe to the longitudinal drainage pipe and the advanced drainage pipe embedded in the surrounding rock. Step 7: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time. Step 8: Pour concrete between the corrugated steel plate and the surrounding rock.

[0014] The construction method for the drainage structure of the corrugated steel plate tunnel support system also includes step 9: after the concrete has solidified, pumping acetone solvent to dissolve the polyurethane filler into the circumferential drainage pipe, longitudinal drainage pipe and advanced drainage pipe.

[0015] A construction method for the drainage structure of the corrugated steel plate tunnel support system includes the following steps: Step 1: Mark the locations of the longitudinal drainage pipes, the advanced drainage pipes, and the corrugated steel plates on the surrounding rock. Step 2: Laying out and constructing advanced drainage pipes, and excavating tunnels; Step 3: Drill holes in the surrounding rock and install longitudinal drainage pipes for the surrounding rock; Step 4: Install a flexible waterproof cloth on the tail end of the pre-drainage pipe exposed in the surrounding rock; Step 5: Install the circumferential drainage pipe and connect it to the longitudinal drainage pipe and the advance drainage pipe; Step 6: Completely wrap the flexible waterproof cloth around the ring drainage pipe, expose the longitudinal drainage pipe and the pre-drainage pipe exposed by the surrounding rock, and fix the waterproof cloth to the surface of the surrounding rock. Step 7: Spray waterproof material onto the surface of the corrugated steel sheet facing the surrounding rock, and lay and install the corrugated steel sheet according to the marked laying position; Step 8: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time. Step 9: Pour concrete between the corrugated steel plate and the surrounding rock.

[0016] A construction method for a drainage structure used in a corrugated steel plate tunnel support system includes the following steps: Step 1: Mark the longitudinal drainage pipe laying device, the advanced drainage pipe laying position, the grouting bag laying position and the direct concrete pouring position on the surrounding rock. Step 2: Directly pour concrete into the area: Step 2.1: Spray waterproof material onto the side of the corrugated steel plate facing the surrounding rock and install it at the marked position. Then spray waterproof material onto the side of the corrugated steel plate facing the driveway and seal the holes on the surface of the corrugated steel plate. Pour concrete between the corrugated steel plate and the surrounding rock. Step 2.2: Wait for the concrete to harden; Step 3: Area for grouting bag placement: Step 3.1: Lay out and construct advanced drainage pipes according to the marked locations, and excavate the tunnel; Step 3.2: Drill holes in the surrounding rock and install longitudinal drainage pipes for the surrounding rock; Step 3.3: Lay grouting bags with the circumferential drainage pipes tied together between the areas where concrete is directly poured, and connect the circumferential drainage pipes to the longitudinal drainage pipes and the advance drainage pipes; Step 3.4: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass and place it under the grouting bag. Then spray waterproof material onto the side of the corrugated steel plate facing the driveway and seal the holes on the corrugated steel plate at the same time. Step 3.5: Pump concrete into the grouting bag.

[0017] The beneficial effects of this invention are: 1. This drainage structure increases the collection effect of rock water in the tunnel by adding advanced drainage pipes, reduces the impact of blockage of water inlet holes on the circumferential drainage pipes, and wraps geotextile and plastic blind drains around the three types of drainage pipes to prevent fine concrete debris from entering the drainage pipes without affecting water entry.

[0018] 2. To prevent fine concrete debris from entering the drainage pipe, polyurethane foam is first filled into the inlet hole to prevent residual fine debris that has been filtered by geotextile and plastic blind drain from entering the drainage pipe during concrete pouring.

[0019] 3. The connection structure between the advanced drainage pipe and the circumferential drainage pipe is designed as a threaded structure to facilitate the installation of the advanced drainage pipe.

[0020] 4. The circumferential drainage pipe and the corrugated steel plate are assembled as a single unit, which facilitates the formation of the waterproof structure.

[0021] 5. To prevent concrete debris from entering the drainage pipe, the drainage pipe inside the corrugated steel plate can be wrapped in advance. This flexible waterproof cloth is easy to use, and when the concrete is poured, it can further adhere to the drainage pipe, providing a cooperative reinforcement effect for the concrete. It does not affect water inflow and also serves to isolate the concrete.

[0022] 6. Lay the drainage pipe section that needs to be filled with concrete inside the corrugated steel separately. Set up an independent grouting bag below the circumferential drainage pipe. Inject concrete into the grouting bag and prevent fine concrete debris from entering the drainage pipe. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the drain pipe connection according to the present invention; Figure 3 This is a schematic diagram of the drainage pipe of the present invention; Figure 4 This is a schematic diagram of the water inlet pipe of the present invention; Figure 5 This is a schematic diagram of the installation of the circumferential drainage pipe of the present invention; Figure 6 This is an exploded view of the connection between the circumferential drainage pipe and the longitudinal drainage pipe of the present invention. Figure 7 This is a schematic diagram showing the connection between the circumferential drainage pipe and the advanced drainage pipe of the present invention; Figure 8 This is a schematic diagram of the inlet pipe of the advanced drainage pipe of the present invention; Figure 9 This is an exploded view of the connection between the circumferential drainage pipe and the advanced drainage pipe of the present invention. Figure 10 This is a schematic diagram showing the connection between the advanced drainage pipe and the flexible waterproof cloth of the present invention; Figure 11 This is a diagram of the grouting bag-type drainage structure of the present invention; Figure 12 This is a schematic diagram of the grouting bag structure of the present invention; In the diagram: 1. Corrugated steel plate, 101. Connecting ring, 102. Pipe hole, 2. Circumferential drainage pipe, 3. Longitudinal drainage pipe, 4. Drainage ditch, 5. Filling cavity, 6. Advance drainage pipe, 7. Plastic blind drain, 8. Geotextile, 9. Water inlet pipe, 901. Water inlet hole, 10. Flexible waterproof cloth, 11. Grouting bag, 1101. Grouting port. Detailed Implementation

[0024] To address the issue that traditional drainage structures cannot meet the requirements of corrugated steel support conditions, this application proposes a drainage structure that ensures drainage pipes are not blocked before concrete hardens. Furthermore, for water-rich mountain tunnels, pre-construction drainage of the rock mass facilitates smooth construction and ensures site safety. Therefore, in addition to the traditional longitudinal drainage pipes embedded in the rock mass, a pre-excavation drainage pipe system is added. Depending on the geological conditions and design strength, some or all of these pre-excavation small guide pipes simultaneously function as drainage pipes and are connected to the initial support drainage system. This allows the structure to provide initial rock mass support and remove moisture from the rock mass, while continuing to serve as a drainage system later. Furthermore, it reduces construction steps and material usage, resulting in economic benefits.

[0025] 1. Main structure for waterproofing and drainage Compared to traditional drainage pipes, the corrugated steel support structure requires consideration of the potential blockage caused by concrete filling during later construction. This structure replaces the traditional single-pipe drainage system in concrete pouring areas. For example... Figure 1 , Figure 2 As shown, a drainage structure for a corrugated steel plate tunnel support system includes a corrugated steel plate 1, a circumferential drainage pipe 2, a longitudinal drainage pipe 3 for insertion into the surrounding rock of the tunnel, an advanced drainage pipe 6 for insertion into the surrounding rock of the tunnel, and two bottom drainage ditches 4 set along the tunnel extension direction. The corrugated steel plate 1 has an arc-shaped structure. During construction, waterproof material is sprayed on both the top and bottom surfaces of the corrugated steel plate. The corrugated steel plates 1 can be connected by bolts or welding. Multiple corrugated steel plates 1 are connected around the tunnel wall to form an arch structure. The bottom of the arch structure is supported on the tunnel bottom surface. The arch structure and the surrounding rock of the tunnel form a filling cavity 5 that can be filled with concrete. A circumferential drainage pipe 2 is installed in the filling cavity 5, which is laid around the tunnel wall. The two ends of the circumferential drainage pipe 2 extend into the bottom drainage ditch 4 on the corresponding side. The circumferential drainage pipe 2 is longitudinally connected to multiple longitudinal drainage pipes 3 inserted into the surrounding rock of the tunnel through a T-junction. The circumferential drainage pipe 2 is also connected to an advanced drainage pipe 6 that is inclined towards the tunnel face and inserted into the surrounding rock of the tunnel. Concrete is filled into the filling cavity 5 after installation.

[0026] like Figure 3 As shown, the circumferential drainage pipe 2, the longitudinal ring water pipe 3, and the advanced drainage pipe 6 are all composed of 3 parts, which are, from the outside to the inside, a mesh rigid plastic blind drain 7, a geotextile 8, and an inlet pipe 9.

[0027] Rigid mesh plastic blind drain: This mesh plastic blind drain 7 has a certain strength and can produce a certain amount of bending deformation. It can effectively block larger sand and gravel particles. It can be made of polyethylene material and is insoluble in propanol.

[0028] Geotextile 8: The material is relatively soft, corrosion-resistant and has good water permeability. It can filter small sand and gravel particles. Geotextile is mainly made of polyester (polyester fiber), acrylic fiber (polyacrylonitrile fiber), and nylon / polypropylene fiber (polypropylene fiber). It is insoluble in propanol.

[0029] Water inlet pipe 9: The water inlet pipe of the advanced drainage pipe is made of steel, the same material as the traditional advanced small guide pipe. The water inlet pipe of the longitudinal drainage pipe and the circumferential drainage pipe is made of polyethylene. Water inlet holes 901 are arranged in a cross-shaped staggered pattern along the length of the pipe wall to facilitate the inflow of water in the rock mass during the later operation of the drainage pipe. To further improve the anti-clogging effect, anti-clogging agents can be pre-filled on the water inlet holes 901.

[0030] The anti-clogging agent is made of an organic reagent-soluble solid substance, insoluble in water, such as polyurethane filler. It is injected into the inlet hole 901 and dissolved in an organic solvent, such as propanol. The polyurethane filler is pre-filled into the inlet hole 901 of the water inlet pipe to prevent fine aggregate particles from entering the pipe and causing blockage before the poured concrete sets. After the concrete has set, the corresponding organic solvent is pumped into the lower side of the inlet pipe to dissolve the anti-clogging agent, which is then discharged outside the pipe without any corrosive effect on the drainage pipe.

[0031] 2. Corrugated steel plate self-waterproof structure Traditional waterproofing membranes offer the advantage of complete sealing. In structures with corrugated steel as the initial support, the corrugated steel provides excellent circumferential sealing within the tunnel. Therefore, this characteristic of corrugated steel plates can be utilized as the framework for the waterproofing membrane, with waterproofing material sprayed onto both sides, forming an integrated waterproofing membrane-support structure. Simultaneously, if... Figure 5 As shown, the corrugated steel support is a prefabricated assembly structure, which directly integrates the circumferential drainage pipe with the corrugated steel to form an integrated prefabricated assembly structure. It only needs to be assembled on site, which shortens the construction period.

[0032] The corrugated steel plate 1 is prefabricated, and pipe holes 102 are arranged on the corrugated steel plate to facilitate the passage and assembly of the circumferential drainage pipe. At the same time, the connecting ring 101 on the corrugated steel plate 1 is used to bind and fix the circumferential drainage pipe 2, and can be bound together with the connecting ring of the tee pipe used to assemble other drainage pipes.

[0033] A circumferential drainage pipe 2 is installed within the trough of the arc-shaped outer side of the corrugated steel plate 1. This pipe can be connected to the longitudinal drainage pipe 3 within the surrounding rock via a tee. The joint is reinforced with a rubber ring. Figure 6 As shown.

[0034] 3. Advanced drainage pipe structure Construction in water-rich areas often results in water inrush and sudden water flow. Controlling the flow of water in the rock mass of the water-rich area ahead and draining it can ensure the smooth progress of subsequent construction and also avoid the collapse of the tunnel caused by the pressure imbalance due to the discharge of a large amount of water at once.

[0035] Therefore, under favorable rock conditions, the pre-drainage pipe does not require grouting and can be directly used as a drainage structure due to its hollow structure with small holes. After the pre-drainage pipe has completed excavation and maintained the stability of the surrounding rock during the initial support period, it is connected to the tunnel circumferential drainage pipe via a tee pipe to form pre-drainage pipe 6, as shown. Figure 7 As shown.

[0036] To better connect the advanced drainage pipe 6 to the circumferential drainage pipe 2, a knob-type connector is designed, such as... Figure 8As shown. The tail end of the pre-conduit pipe is pre-threaded, and the tee pipe facing the pre-conduit pipe (vertical pipe) also has matching threads pre-threaded. During later construction, installation can be completed simply by tightening the knob. The horizontal pipe section of the tee pipe is connected to the circumferential drain pipe 2 via a rubber ring.

[0037] 4. Flexible waterproof fabric anti-clogging structure To prevent leakage into the drainage pipes and blockage before the poured concrete sets, after the drainage pipes are installed, a layer of flexible waterproof fabric is laid only around the circumferential drainage pipes 2, longitudinal drainage pipes 3, and advanced drainage pipes 6 located within the corrugated steel plate 1. This flexible waterproof fabric 10 is flexible and adaptable; during subsequent concrete pouring, it can deform with changes in the amount of concrete injected, thus tightly wrapping the exposed portion of the drainage pipe outside the rock body. This prevents the concrete from directly contacting the drainage pipe and provides excellent reinforcement.

[0038] I-beams can be used for support at locations requiring it. The I-beams are positioned in front of the tunnel face, with small holes of the same diameter as the advance drainage pipe made in the web. The advance drainage pipe 6 is then driven into the tunnel face through these holes. This serves two purposes: supporting the tunnel arch and securing the advance drainage pipe 6 in place.

[0039] The flexible waterproof fabric 10 is made of soft, waterproof, and corrosion-resistant material. A small hole is made on one side of the flexible waterproof fabric 10, through which the pre-drainage pipe 6 is inserted, and the flexible waterproof fabric 10 is then tied and secured in place. The other side completely wraps around the circumferential drainage pipe 2 and the longitudinal drainage pipe 3 connected to the circumferential drainage pipe 2, ensuring that there are no exposed areas of the drainage pipes in the concrete-filled area.

[0040] The corrugated steel plate used in conjunction with the flexible waterproof fabric 10 is a self-waterproof corrugated steel. The corrugated steel plate 1 serves as the skeleton, and waterproof material is sprayed on it, so that the corrugated steel plate 1 forms a self-waterproof corrugated steel system after installation.

[0041] 5. Anti-clogging structure of grouting bag To isolate the poured concrete from the drainage pipes and prevent the drainage pipes from clogging before the concrete sets, a grouting bag-type drainage structure has been invented. This structure is used for drainage in areas where drainage pipes are laid. In areas where drainage pipes are not laid, concrete is poured directly, with space reserved for the grouting bag. The overall structure is as follows: Figure 11 As shown:

[0042] like Figure 12 As shown, the grouting bag 11 is a soft, water-permeable, and air-permeable material, but impermeable to concrete, and is in the form of a wrap-around container. One end of the bag has a grouting port 1101, through which concrete can be pumped into the bag. The side of the grouting bag closest to the tunnel rock mass is equipped with binding straps to secure the drainage pipe.

[0043] The corrugated steel plate used in conjunction with the grouting bag 11 is a self-waterproof corrugated steel. The corrugated steel plate 1 serves as the skeleton, and waterproof material is sprayed on it, so that the corrugated steel plate 1 forms a self-waterproof corrugated steel system after installation.

[0044] Example 1 A construction method for a drainage structure for a corrugated steel plate tunnel support system, based on a novel drainage structure, includes corrugated steel plates 1, circumferential drainage pipes 2, longitudinal drainage pipes 3, advanced drainage pipes 6, and two bottom drainage ditches 4 set along the tunnel extension direction. Multiple corrugated steel plates 1 are connected circumferentially along the inner wall of the tunnel to form an arched structure. The bottom of the arched structure is supported on the bottom surface of the tunnel. The arched structure and the surrounding rock of the tunnel form a filling cavity 5 that can be filled with concrete. A circumferential drainage pipe (2) is installed in the filling cavity 5, which is arranged circumferentially along the inner wall of the tunnel. Both ends of the water pipe 2 extend into the bottom drainage ditch 4 on the corresponding side. Multiple longitudinal drainage pipes 3, inserted into the tunnel surrounding rock, are longitudinally connected to the circumferential drainage pipe 2 via a T-junction. An advanced drainage pipe 6, inclined towards the tunnel face and inserted into the tunnel surrounding rock, is also connected to the circumferential drainage pipe 2. The circumferential drainage pipe 2, longitudinal drainage pipes 3, and advanced drainage pipe 6 are all composed of a plastic blind drain 7, geotextile 8, and an inlet pipe 9 with an inlet hole 901. The surface of the inlet pipe 9 is covered from the inside out with geotextile 8 and the plastic blind drain 7. The specific construction method includes the following steps: Step 1: Mark the locations of longitudinal drainage pipes, advanced drainage pipes, and corrugated steel plates on the surrounding rock using infrared positioning. Step 2: Drill holes at the marked locations on the surrounding rock to lay the advance drainage pipes, and then excavate the tunnel. Step 3: Drill holes at the marked locations on the surrounding rock for laying the longitudinal drainage pipes, and insert the longitudinal drainage pipes into the holes. Step 4: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass; Step 5: The circumferential drainage pipe is laid on the corrugated steel plate; Step 6: Lay the corrugated steel plates at the marked corrugated steel plate laying positions, and connect the circumferential drainage pipe to the longitudinal drainage pipe and the advanced drainage pipe embedded in the surrounding rock. Step 7: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes (openings or gaps between plate joints) on the corrugated steel plate at the same time. Step 8: Pour concrete between the corrugated steel plate and the rock mass.

[0045] Example 2 A construction method for a drainage structure for a corrugated steel plate tunnel support system is provided. Based on a novel drainage structure, this drainage structure is the same as that in Example 1, except that the inlet hole 901 is filled with polyurethane filler that is dissolved by acetone after the concrete has solidified. Therefore, in the specific implementation method, step 9 is added to steps 1-8 of Example 1. In step 9, after the concrete has solidified, acetone solvent to dissolve the polyurethane filler is pumped into the circumferential drainage pipe, the vertical drainage pipe and the advanced drainage pipe.

[0046] Example 3 A construction method for a drainage and waterproofing structure for a corrugated steel plate tunnel support system, based on a novel drainage and waterproofing structure, which is the same as in Example 1, but with the addition that the circumferential drainage pipe 2, longitudinal drainage pipe 3, and advanced drainage pipe 6 located within the corrugated steel plate 1 are wrapped with a flexible waterproof cloth 10. The specific construction method includes the following steps: Step 1: Mark the installation positions of longitudinal drainage pipes, advanced drainage pipes, and corrugated steel plates on the surrounding rock using infrared positioning. Step 2: Excavate holes according to the installation location of the advance drainage pipes, lay the advance drainage pipes in the holes, and excavate tunnels; Step 3: Drill holes in the surrounding rock according to the installation location of the longitudinal drainage pipe, and install the longitudinal drainage pipe in the surrounding rock. Step 4: Install a flexible waterproof cloth on the end of the pre-drainage pipe that is exposed in the surrounding rock; Step 5: Install the circumferential drainage pipe and connect it to the longitudinal drainage pipe and the advance drainage pipe; Step 6: Completely wrap the flexible waterproof cloth around the circumferential drainage pipe, expose the vertical drainage pipe and the pre-lead drainage pipe exposed by the surrounding rock, and fix the waterproof cloth to the surface of the surrounding rock with a pneumatic nail gun. Step 7: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass; Step 8: Lay out and install the corrugated steel sheets according to their location. Step 9: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time. Step 10: Pour concrete between the corrugated steel plate and the surrounding rock.

[0047] Example 4 A construction method for a drainage structure in a corrugated steel plate tunnel support system, based on a novel drainage structure, which is the same as in Example 1, but with the addition of a grouting bag 11 extending to the tunnel bottom at both ends on the side of the corrugated steel plate 1 facing the surrounding rock. A circumferential drainage pipe 2 is fixed above the grouting bag 11. The specific construction method includes the following steps: Step 1: Mark the installation positions of the longitudinal drainage pipes, the pre-drainage pipes, the grouting bag placement positions, and the direct concrete pouring positions using infrared positioning.

[0048] Step 2: Directly pour concrete into the area: Step 2.1: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass; Step 2.2: Install and lay corrugated steel plates according to the location of the directly poured concrete; Step 2.3: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time; Step 2.4: Pour concrete between the corrugated steel plate and the surrounding rock; Step 2.5: Wait for the concrete to solidify.

[0049] Step 3: Pour the grouting bag placement area: Step 3.1: Drill holes in the surrounding rock according to the marked locations for laying the advance drainage pipes, install the advance drainage pipes, and excavate the tunnel; Step 3.2: Drill holes in the surrounding rock according to the marked longitudinal drainage pipe installation positions, and install the longitudinal drainage pipes in the surrounding rock. Step 3.3: Install the grouting bags according to the marked placement positions, and simultaneously secure the circumferential drainage pipes; Step 3.4: Connection of the circumferential drainage pipe with the longitudinal drainage pipe and the advance drainage pipe; Step 3.5: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass; Step 3.6: Lay and install corrugated steel plates below the grouting bag; Step 3.7: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time; Step 3.8: Pump concrete into the grouting bag.

Claims

1. A drainage structure for a corrugated steel plate tunnel support system, comprising corrugated steel plates (1), circumferential drainage pipes (2), longitudinal drainage pipes (3), and two bottom drainage ditches (4) arranged along the tunnel extension direction, wherein multiple corrugated steel plates (1) are connected circumferentially along the inner wall of the tunnel to form an arched structure, the bottom of the arched structure is supported on the bottom surface of the tunnel, and the arched structure and the surrounding rock of the tunnel form a filling cavity (5) that can be filled with concrete, characterized in that: The drainage structure also includes an advanced drainage pipe (6), and the corrugated steel plate (1) is sprayed with waterproof material on both sides. A circumferential drainage pipe (2) is installed in the cavity (5) along the circumferential direction of the tunnel wall. The two ends of the circumferential drainage pipe (2) extend into the bottom drainage ditch (4) on the corresponding side. The circumferential drainage pipe (2) is connected longitudinally to multiple longitudinal drainage pipes (3) inserted into the surrounding rock of the tunnel through a three-way pipe. The circumferential drainage pipe (2) is also connected to an advanced drainage pipe (6) inserted into the surrounding rock of the tunnel at an incline towards the face. The circumferential drainage pipe (2), longitudinal drainage pipe (3) and advanced drainage pipe (6) are all composed of plastic blind drain (7), geotextile (8) and water inlet pipe (9) with water inlet hole (901). The surface of the water inlet pipe (9) is covered with geotextile (8) and plastic blind drain (7) from the inside to the outside. The water inlet (901) is filled with polyurethane filler that is dissolved in acetone after the concrete has solidified. The advanced drainage pipe (6) is connected to the circumferential drainage pipe (2) through a tee pipe, and the part where the advanced drainage pipe (6) is connected to the tee pipe has a matching thread structure.

2. The drainage and waterproofing structure for a corrugated steel plate tunnel support system as described in claim 1, characterized in that: The corrugated steel plate (1) and the circumferential drainage pipe (2) are prefabricated as an integral structure. The corrugated steel plate (1) is provided with pipe holes for the circumferential drainage pipe (2) to pass through, and a connecting ring (101) for fixing and binding the circumferential drainage pipe (2) is provided inside the corrugated steel plate (1).

3. The drainage and waterproofing structure for a corrugated steel plate tunnel support system as described in claim 1, characterized in that: Flexible waterproof cloth (10) is wrapped around the circumferential drainage pipe (2), longitudinal drainage pipe (3) and advanced drainage pipe (6) located in the corrugated steel plate (1).

4. The drainage and waterproofing structure for a corrugated steel plate tunnel support system as described in claim 1, characterized in that: The corrugated steel plate (1) has grouting bags (11) extending to the bottom of the tunnel at both ends on the side facing the surrounding rock. A circumferential drainage pipe (2) is fixed above the grouting bags (11).

5. A construction method for a drainage and waterproofing structure based on the corrugated steel plate tunnel support system as described in claim 1 or 2, characterized in that, Includes the following steps: Step 1: Mark the locations of vertical drainage pipes, advanced drainage pipes, and corrugated steel plates on the surrounding rock. Step 2: Lay out advanced drainage pipes and excavate the tunnel; Step 3: Drill holes in the surrounding rock and install vertical drainage pipes; Step 4: Spray waterproof material onto the side of the corrugated steel plate facing the surrounding rock; Step 5: The circumferential drainage pipe is laid on the corrugated steel plate; Step 6: Lay corrugated steel plates on the surrounding rock, and connect the circumferential drainage pipe to the vertical drainage pipe and the advanced drainage pipe embedded in the surrounding rock. Step 7: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time. Step 8: Pour concrete between the corrugated steel plate and the surrounding rock.

6. The construction method of the drainage structure for the corrugated steel plate tunnel support system as described in claim 5, characterized in that: It also includes step 9, after the concrete has solidified, pumping acetone solvent to dissolve the polyurethane filler into the circumferential drainage pipe, vertical drainage pipe and advanced drainage pipe.

7. A construction method for a drainage and waterproofing structure based on the corrugated steel plate tunnel support system according to claim 3, characterized in that, Includes the following steps: Step 1: Mark the locations of vertical drainage pipes, advanced drainage pipes, and corrugated steel on the surrounding rock. Step 2: Laying out and constructing advanced drainage pipes, and excavating tunnels; Step 3: Drill holes in the surrounding rock and install vertical drainage pipes for the surrounding rock; Step 4: Install a flexible waterproof cloth on the tail end of the pre-drainage pipe exposed in the surrounding rock; Step 5: Install the circumferential drainage pipe and connect it to the vertical drainage pipe and the advance drainage pipe; Step 6: Completely wrap the flexible waterproof cloth around the ring drain pipe, leaving the vertical drain pipe and the pre-drain pipe exposed in the surrounding rock, and fix the waterproof cloth to the surface of the surrounding rock. Step 7: Spray waterproof material onto the surface of the corrugated steel sheet facing the surrounding rock, and lay and install the corrugated steel sheet according to the marked laying position; Step 8: Spray waterproof material onto the corrugated steel plate facing the driveway, and seal the holes in the corrugated steel plate at the same time. Step 9: Pour concrete between the corrugated steel plate and the surrounding rock.

8. A construction method for a drainage and waterproofing structure based on the corrugated steel plate tunnel support system according to claim 4, characterized in that, Includes the following steps: Step 1: Mark the vertical drainage pipe laying device, the pre-drainage pipe laying position, the grouting bag laying position, and the direct concrete pouring position on the surrounding rock. Step 2: Directly pour concrete into the area: Step 2.1: Spray waterproof material onto the side of the corrugated steel plate facing the surrounding rock and install it at the marked position. Then spray waterproof material onto the side of the corrugated steel plate facing the driveway and seal the holes on the surface of the corrugated steel plate. Pour concrete between the corrugated steel plate and the surrounding rock. Step 2.2: Wait for the concrete to harden; Step 3: Area for grouting bag placement: Step 3.1: Lay out and construct advanced drainage pipes according to the marked locations, and excavate the tunnel; Step 3.2: Drill holes in the surrounding rock and install vertical drainage pipes for the surrounding rock; Step 3.3: Lay grouting bags with the circumferential drainage pipes tied together between the areas where concrete is directly poured, and connect the circumferential drainage pipes to the vertical drainage pipes and the pre-drainage pipes; Step 3.4: Spray waterproof material onto the side of the corrugated steel plate facing the rock mass and place it under the grouting bag. Then spray waterproof material onto the side of the corrugated steel plate facing the driveway and seal the holes on the corrugated steel plate at the same time. Step 3.5: Pump concrete into the grouting bag.

9. The construction method of the drainage structure for the corrugated steel plate tunnel support system as described in claim 7, characterized in that, After the drainage pipes are installed, a layer of flexible waterproof cloth (10) is laid around the circumferential drainage pipe (2) and the longitudinal drainage pipe (3) and the advanced drainage pipe (6) located in the corrugated steel plate (1).

10. The construction method of the drainage structure for the corrugated steel plate tunnel support system as described in claim 8, characterized in that, The grouting bag (11) has a grouting port (1101) at one end. Concrete is pumped into the bag from the opening. The side of the grouting bag that is close to the tunnel rock mass is equipped with a binding strap to fix the drainage pipe.

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