Composite chute for tunnel secondary lining concrete pouring and method of use

Abstract

The application discloses a composite chute for tunnel secondary lining concrete pouring and a use method thereof. The composite chute is composed of a plurality of composite chute units and extends from a discharge port of a secondary lining trolley to a trolley window. Each composite chute unit comprises a foldable chute main body, a reinforcing steel plate, a side screw rod, a perforated steel pipe and a perforated flat steel. The composite chute unit is detachably installed on an internal steel beam of the secondary lining trolley through a mounting support. The application relates to the technical field of tunnel engineering and can solve the problems of the heavy weight, the unadjustable size and the poor flexibility of the traditional chute.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, and in particular to a composite chute for pouring secondary lining concrete in tunnels and its application method. Background Technology

[0002] In recent years, tunnel construction technology in my country has advanced rapidly, and information technology has been widely applied and promoted in tunnel construction, such as the introduction of automatic concrete placing devices for secondary lining trolleys. These devices consist of a placing disc and a placing guide pipe, with the guide pipe being a steel cylindrical pipe. Concrete is introduced into the trolley window through the steel pipe, but the closed steel pipe is prone to concrete adhesion, leading to blockages. Furthermore, the steel pipe is heavy, making it difficult to disassemble and clean as a closed pipeline, and long-term use can easily cause serious quality defects such as cold joints in the tunnel arch. Therefore, some construction workers have adopted chutes instead of conveying steel pipes. However, traditional chutes are heavy, have non-adjustable dimensions, and lack flexibility, making them difficult to adapt to complex construction environments.

[0003] Chinese invention patent CN110924988B discloses a tunnel secondary lining concrete chute pouring system and construction method. The chute system of this invention includes a main hopper, a distribution hopper, a plate, a steel formwork, a fixed chute, a movable chute, a pouring window, and other devices. Although the chute system can successfully complete the pouring of secondary lining concrete, the entire device has a complex structure, is difficult to install, and involves the use of electronic components, resulting in high costs and making it unsuitable for widespread application in actual engineering projects.

[0004] Chinese utility model patent CN212535688U discloses a simple chute for subway construction. Although the simple chute has a simple structure, it is not adjustable and lacks flexibility, which increases the difficulty of construction operations.

[0005] Chinese utility model patent CN217128996U discloses a telescopic concrete chute device. Although the chute has a telescopic function and high flexibility, it is made of only steel and bolts, resulting in a large self-weight. Moreover, steel is prone to rust, leading to a short service life, which is not conducive to its widespread application in practical engineering.

[0006] Therefore, there is a need to provide a composite chute and its application method for pouring concrete for the secondary lining of tunnels, which can solve the problems of heavy weight, non-adjustable size, and poor flexibility of traditional chutes. Summary of the Invention

[0007] The purpose of this invention is to provide a composite chute for pouring concrete for the secondary lining of tunnels and its application method, which can solve the problems of traditional chutes being heavy, having non-adjustable dimensions, and having poor flexibility.

[0008] This invention is implemented as follows:

[0009] A composite chute for pouring secondary lining concrete in tunnels is disclosed. The composite chute is composed of several composite chute units, extending from the discharge port of the secondary lining trolley to the trolley window. Each composite chute unit includes a foldable chute body, reinforcing steel plates, side bolts, perforated steel pipes, and perforated flat steel. Several reinforcing steel plates are spaced apart and installed on the bottom surface of the foldable chute body. The perforated flat steel is detachably installed on the reinforcing steel plates, with both ends extending to the outer sides of the foldable chute body. One end of the perforated steel pipe is detachably connected to the end of the perforated flat steel, and the other end is detachably connected to the outer wall of the foldable chute body. A pair of perforated steel pipes are located on both sides of the foldable chute body. A pair of perforated steel pipes and the perforated flat steel form a U-shaped mounting bracket that surrounds the foldable chute body on three sides. The composite chute unit is detachably installed on the internal steel beam of the secondary lining trolley via the mounting bracket.

[0010] The perforated flat steel has several mounting holes spaced apart, and these mounting holes are arranged in a straight line along the length of the perforated flat steel. The reinforcing steel plate and the perforated steel pipe are connected to the mounting holes of the perforated flat steel.

[0011] The reinforcing steel plate is provided with a steel plate screw, and two nuts are screwed onto the steel plate screw. The steel plate screw can pass through one of the mounting holes of the perforated flat steel, and the two nuts on the steel plate screw are pressed against the two surfaces of the perforated flat steel, so that the reinforcing steel plate is connected and fixed to the perforated flat steel.

[0012] The perforated steel pipe has an external thread section formed on the outer wall of one end, and two nuts are screwed onto the external thread section; one end of the perforated steel pipe can pass through one of the mounting holes of the perforated flat steel, and the two nuts on the perforated steel pipe are pressed against the two surfaces of the perforated flat steel, so that one end of the perforated steel pipe is connected and fixed to the perforated flat steel.

[0013] The other end of the perforated steel pipe has a through hole formed radially. A side screw is provided on the outer side surface of the foldable chute body. The side screw passes through the through hole at the other end of the perforated steel pipe and is fitted with a nut, so that the nut on the side screw is tightened on the perforated steel pipe, thereby connecting and fixing the perforated steel pipe to the foldable chute body.

[0014] The length direction of the reinforcing steel plate is consistent with the length direction of the foldable chute body, and a pair of reinforcing steel plates are symmetrically arranged on both sides of the bottom surface of the foldable chute body.

[0015] The width of the reinforcing steel plate is one-third of the width of the bottom surface of the foldable chute body, leaving a gap between the pair of reinforcing steel plates.

[0016] The pair of perforated steel pipes and perforated flat steel of the mounting bracket are located in the same plane, and the plane is perpendicular to the length direction of the foldable chute body. Several mounting brackets are arranged at intervals along the length direction of the foldable chute body.

[0017] The foldable chute body is formed by bending EVA waterproof membrane to create a U-shaped chute.

[0018] A method for using a composite chute for pouring secondary lining concrete in tunnels includes the following steps:

[0019] Step 1: Attach two reinforcing steel plates to the bottom of the foldable chute body, weld steel plate bolts to the bottom of the reinforcing steel plates, and screw two nuts onto the steel plate bolts;

[0020] Step 2: Based on the width of the composite chute unit, determine the insertion position of the steel plate screw in the perforated flat steel. After the steel plate screw is inserted into the mounting hole of the perforated flat steel, tighten the two nuts on the steel plate screw to fix the perforated flat steel on the two reinforcing steel plates.

[0021] Step 3: Insert one end of a pair of perforated steel pipes into the mounting holes of the perforated flat steel, so that the side bolts on the outer walls of the left and right sides of the foldable chute body pass through the through holes at the other ends of the pair of perforated steel pipes, and screw them onto the perforated steel pipes with nuts, so that the pair of perforated steel pipes are fixed to both sides of the foldable chute body.

[0022] Step 4: Detachably install and fix the mounting bracket to the internal steel beam of the secondary lining trolley; the mounting bracket rests against the discharge port of the secondary lining trolley;

[0023] Step 5: Through the coordinated arrangement of multiple composite chute units, concrete can be smoothly guided from the discharge port to the discharge window, thereby completing the pouring of the secondary lining concrete.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention uses multiple lightweight composite chute units combined together and installed on the internal steel beams of the trolley by binding with steel wires. The secondary lining concrete is guided from the discharge port of the trolley to the trolley window. The combination arrangement is convenient, which can enable the secondary lining concrete to be poured quickly, eliminate problems such as uneven material distribution, and the size is adjustable and the structure is stable. It provides a lightweight and highly adaptable solution for secondary lining concrete pouring, which is conducive to improving the construction quality and efficiency of tunnel secondary lining concrete.

[0026] 2. The present invention uses an installation bracket composed of perforated steel pipes and perforated flat steel, which has the characteristics of convenient disassembly and assembly, easy material sourcing and manufacturing, strong installation adaptability, flexibility and versatility, and high turnover rate. Combined with the foldable chute body, it can meet the size adjustment requirements of the composite chute unit and reduce construction costs to a certain extent.

[0027] 3. This invention uses a foldable chute body made of bent EVA waterproof membrane, which ensures that concrete can flow quickly and non-stick in the composite chute, improving pouring efficiency while being easy to clean, not easy to rust, with strong ductility and fatigue resistance, and long service life. It solves the problems of easy pipe blockage, heavy weight, easy storage, and space saving in the existing secondary lining concrete pouring chute. Attached Figure Description

[0028] Figure 1 This is a perspective view of the composite chute used for pouring secondary concrete in tunnels according to the present invention.

[0029] Figure 2 This is a front view of the composite chute used for pouring secondary concrete in tunnels according to the present invention.

[0030] Figure 3 This is a side view of the composite chute used for pouring secondary concrete in tunnels according to the present invention.

[0031] Figure 4 This is a bottom view of the composite chute used for pouring secondary concrete in tunnels according to the present invention.

[0032] Figure 5 This is a top view of the installation of the composite chute used for pouring secondary concrete in tunnels according to the present invention.

[0033] In the figure, 1. Foldable chute body, 2. Reinforcing steel plate, 3. Side screw, 4. Nut, 5. Perforated steel pipe, 6. Perforated flat steel, 7. Steel plate screw, 8. Secondary lining trolley template, 9. Discharge port, 10. Secondary lining concrete, 11. Internal steel beam, 12. Composite chute unit, 13. Trolley window. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Please see the appendix Figure 1 To be continued Figure 5A composite chute for pouring secondary lining concrete in tunnels is disclosed. The composite chute is composed of several composite chute units 12, extending from the discharge port 9 of the secondary lining trolley to the trolley window 13. Each composite chute unit 12 includes a foldable chute body 1, reinforcing steel plates 2, side bolts 3, perforated steel pipes 5, and perforated flat steel 6. Several reinforcing steel plates 2 are spaced apart and installed on the bottom surface of the foldable chute body 1. The perforated flat steel 6 is detachably installed on the reinforcing steel plates 2. The ends extend to the outer sides of the foldable chute body 1 respectively; one end of the perforated steel pipe 5 is detachably connected to the end of the perforated flat steel 6, and the other end of the perforated steel pipe 5 is detachably connected to the outer side wall of the foldable chute body 1. A pair of perforated steel pipes 5 are located on both sides of the foldable chute body 1 respectively; a pair of perforated steel pipes 5 and perforated flat steel 6 form a U-shaped structure mounting bracket that surrounds the foldable chute body 1 on three sides. The composite chute unit 12 is detachably installed on the inner steel beam 11 of the secondary lining trolley through the mounting bracket.

[0036] The reinforcing steel plate 2 can be made of steel plate, the perforated steel pipe 5 can be made of round steel pipe, and the perforated flat steel 6 can be made of flat steel. All of these are materials commonly used on construction sites in this field. They are easy to obtain and manufacture, and have a small volume, which makes the self-weight of the composite chute unit 12 lighter. Its specifications can be selected according to actual usage requirements.

[0037] The foldable chute body 1 is supported by an installation bracket formed by a pair of perforated steel pipes 5 and perforated flat steel 6, ensuring the flow of the secondary lining concrete 10 within the foldable chute body 1. This also facilitates the installation of the composite chute unit 12 onto the internal steel beams 11 of the secondary lining trolley, allowing for convenient assembly and disassembly. The entire composite chute unit 12 is lightweight, and its detachable assembly method makes installation and reuse easier, offering high flexibility. The flexible connection of the installation bracket allows for size adjustments to the composite chute unit 12.

[0038] Please see the appendix Figure 1 To be continued Figure 4 The perforated flat steel 6 has a number of mounting holes (not shown in the figure) spaced apart. The mounting holes are arranged in a straight line along the length of the perforated flat steel 6. The reinforcing steel plate 2 and the perforated steel pipe 5 are connected to the mounting holes of the perforated flat steel 6.

[0039] The number and spacing of the mounting holes on the perforated flat steel 6 can be adjusted according to actual usage requirements, which facilitates the connection of the reinforcing steel plate 2 and the perforated steel pipe 5, so that the mounting bracket can adapt to the foldable chute body 1 of different sizes, and has good installation versatility and adaptability.

[0040] Please see the appendix Figure 1 To be continued Figure 4The reinforcing steel plate 2 is provided with a steel plate screw 7, and two nuts 4 are screwed onto the steel plate screw 7. The steel plate screw 7 can pass through one of the mounting holes of the perforated flat steel 6, and the two nuts 4 on the steel plate screw 7 are pressed against the two surfaces of the perforated flat steel 6, so that the reinforcing steel plate 2 and the perforated flat steel 6 are connected and fixed.

[0041] Two nuts 4 are tightened onto the two sides of the perforated flat steel 6, and the threaded engagement ensures the reliable connection between the reinforcing steel plate 2 and the perforated flat steel 6. At the same time, the connection spacing between the reinforcing steel plate 2 and the perforated flat steel 6 can be adjusted by rotating the two nuts 4 on the steel plate screw 7 to meet the different installation height and angle requirements of the composite chute unit 12.

[0042] Preferably, the steel plate screw 7 can be welded onto the reinforcing steel plate 2 to ensure the reliability of the connection node.

[0043] Please see the appendix Figure 1 To be continued Figure 4 The outer wall of one end of the perforated steel pipe 5 has an external thread section, and two nuts 4 are screwed onto the external thread section; one end of the perforated steel pipe 5 can pass through one of the mounting holes of the perforated flat steel 6, and the two nuts 4 on the perforated steel pipe 5 are pressed against the two surfaces of the perforated flat steel 6, so that one end of the perforated steel pipe 5 is connected and fixed to the perforated flat steel 6.

[0044] Two nuts 4 are tightened onto the two sides of the perforated flat steel 6, and the threaded engagement ensures the reliable connection between one end of the perforated steel pipe 5 and the perforated flat steel 6. At the same time, by rotating the two nuts 4 on one end of the perforated steel pipe 5, the height of the other end of the perforated steel pipe 5 can be adjusted, so that it can be connected to the foldable chute body 1 of different heights.

[0045] Please see the appendix Figure 1 To be continued Figure 4 The other end of the perforated steel pipe 5 has a through hole (not shown in the figure) formed radially. The outer side surface of the foldable chute body 1 is provided with a side screw 3. The side screw 3 passes through the through hole at the other end of the perforated steel pipe 5 and is matched with a nut 4, so that the nut on the side screw 3 is tightened on the perforated steel pipe 5, thereby connecting and fixing the perforated steel pipe 5 to the foldable chute body 1.

[0046] After the height of the other end of the perforated steel pipe 5 is adjusted to the correct position, its through hole is aligned with the side screw 3 on the outer side of the foldable chute body 1, so that the side screw 3 passes through the through hole and is matched with the screw-on nut 4, thereby making the foldable chute body 1 and the side screw 3 reliably connected to the perforated steel pipe 5 under the action of thread engagement.

[0047] The length direction of the reinforcing steel plate 2 is consistent with the length direction of the foldable chute body 1, and a pair of reinforcing steel plates 2 are symmetrically arranged on both sides of the bottom surface of the foldable chute body 1.

[0048] Preferably, the length of the reinforcing steel plate 2 can be the same as the length of the foldable chute body 1, in order to improve the strength of the foldable chute body 1 and ensure that the composite chute unit can bear the weight of the secondary lining concrete 10.

[0049] Preferably, the width of the reinforcing steel plate 2 is one-third of the bottom width of the foldable chute body 1, so that there is a gap between the pair of reinforcing steel plates 2.

[0050] Since the required flow rate of the secondary lining concrete 10 may vary at different locations, the width of the composite chute unit 12 will also vary accordingly. Through the gap reserved between a pair of reinforcing steel plates 2, the width adjustment requirements of the composite chute unit 12 can be met while ensuring the reinforcement of the bottom of the foldable chute body 1.

[0051] The quantity and size of the reinforcing steel plate 2 can also be adjusted according to actual load requirements.

[0052] The pair of perforated steel pipes 5 and perforated flat steel 6 of the mounting bracket are located in the same plane, and the plane is perpendicular to the length direction of the foldable chute body 1. Several mounting brackets are arranged at intervals along the length direction of the foldable chute body 1.

[0053] The mounting bracket is used for the installation of the composite chute unit 12 on the internal steel beam 11 of the secondary lining trolley. The mounting bracket is arranged along the width section of the foldable chute body 1, and its arrangement direction is perpendicular to the flow direction of the secondary lining concrete 10 in the foldable chute body 1. The U-shaped mounting bracket can stably support the foldable chute body 1 from the bottom and sides.

[0054] Preferably, the distance between two adjacent mounting brackets is 0.5m.

[0055] The number of mounting brackets and their spacing can be adjusted adaptively according to actual installation and load-bearing requirements.

[0056] The foldable chute body 1 is formed by bending EVA waterproof membrane to form a U-shaped chute.

[0057] EVA waterproof membrane is a water-repellent material that ensures concrete flows quickly and non-stick within the foldable chute body 1, improving pouring efficiency and facilitating cleaning. Compared to the steel used in traditional chutes, EVA waterproof membrane is less prone to rust, has higher ductility and fatigue resistance, and a longer service life. Furthermore, its foldability allows the foldable chute body 1 to be disassembled and folded for storage when pouring is not required, effectively saving storage space.

[0058] Please see the appendix Figure 1 To be continued Figure 5 A method for using a composite chute for pouring secondary lining concrete in tunnels includes the following steps:

[0059] Step 1: Two reinforcing steel plates 2 can be glued to the bottom of the foldable chute body 1 using epoxy resin, and steel plate screws 7 are welded to the bottom of the reinforcing steel plates 2, and two nuts 4 are screwed onto the steel plate screws 7.

[0060] Step 2: Based on the width of the composite chute unit 12, determine the insertion position of the steel plate screw 7 in the perforated flat steel 6. After the steel plate screw 7 is inserted into the mounting hole of the perforated flat steel 6, tighten the two nuts 4 on the steel plate screw 7 to make the perforated flat steel 6 firmly fixed on the two reinforcing steel plates 2, thereby completing the lateral fixation of the mounting bracket.

[0061] Step 3: Insert one end of a pair of perforated steel pipes 5 into the mounting holes at appropriate positions on both ends of the perforated flat steel 6, so that the side screws 3 on the outer walls of the left and right sides of the foldable chute body 1 pass through the through holes at the other ends of the pair of perforated steel pipes 5, and screw them onto the perforated steel pipes 5 with nuts 4, so that the pair of perforated steel pipes 5 are firmly fixed to both sides of the foldable chute body 1, thereby achieving vertical fixation of the mounting bracket.

[0062] Step 4: The mounting bracket can be detachably installed and fixed to the internal steel beam 11 of the secondary lining trolley by steel wire binding.

[0063] Preferably, the mounting bracket can be placed against the discharge port 9 of the secondary lining trolley to strengthen the fixation. After being tied with steel wire, the entire composite chute unit 12 and the secondary lining trolley are combined into a stable pouring system, which facilitates the pouring operation of the secondary lining concrete 10.

[0064] Step 5: Through the coordinated arrangement of multiple composite chute units 12, the concrete 10 can be smoothly diverted from the discharge port 9 to the discharge window 13, thereby completing the pouring operation of the secondary lining concrete 10.

[0065] Multiple composite chute units 12 can be arranged adaptively according to the actual flow path of the secondary lining concrete 10 to ensure that the secondary lining concrete 10 flows according to the designed pouring path, which will not be elaborated here.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite chute for pouring concrete for tunnel secondary lining, characterized in that: The composite chute is composed of several composite chute units (12). The composite chute extends from the discharge port (9) of the secondary lining trolley to the trolley window (13). Each composite chute unit (12) includes a foldable chute body (1), a reinforcing steel plate (2), a side screw (3), a perforated steel pipe (5), and a perforated flat steel (6). Several reinforcing steel plates (2) are installed at intervals on the bottom surface of the foldable chute body (1). The perforated flat steel (6) is detachably installed on several reinforcing steel plates (2). The two ends of the perforated flat steel (6) extend to the outside of both sides of the foldable chute body (1). One end of the perforated steel pipe (5) is detachably connected to the end of the perforated flat steel (6), and the other end of the perforated steel pipe (5) is detachably connected to the outer wall of the foldable chute body (1). A pair of perforated steel pipes (5) are located on both sides of the foldable chute body (1). A pair of perforated steel pipes (5) and perforated flat steel (6) form a U-shaped mounting bracket that surrounds the foldable chute body (1) on three sides. The composite chute unit (12) is detachably mounted on the internal steel beam (11) of the secondary lining trolley through the mounting bracket.

2. The composite chute for pouring secondary lining concrete in tunnels according to claim 1, characterized in that: The perforated flat steel (6) has several mounting holes spaced apart. The mounting holes are arranged in a straight line along the length of the perforated flat steel (6). The reinforcing steel plate (2) and the perforated steel pipe (5) are connected to the mounting holes of the perforated flat steel (6).

3. The composite chute for pouring secondary lining concrete in tunnels according to claim 2, characterized in that: The reinforcing steel plate (2) is provided with a steel plate screw (7), and two nuts (4) are screwed onto the steel plate screw (7); the steel plate screw (7) can pass through one of the mounting holes of the perforated flat steel (6), and the two nuts (4) on the steel plate screw (7) are pressed against the two surfaces of the perforated flat steel (6), so that the reinforcing steel plate (2) and the perforated flat steel (6) are connected and fixed.

4. The composite chute for pouring secondary lining concrete in tunnels according to claim 2, characterized in that: The outer wall of one end of the perforated steel pipe (5) has an external thread section, and two nuts (4) are screwed onto the external thread section; one end of the perforated steel pipe (5) can pass through one of the mounting holes of the perforated flat steel (6), and the two nuts (4) on the perforated steel pipe (5) are pressed against the two surfaces of the perforated flat steel (6), so that one end of the perforated steel pipe (5) is connected and fixed to the perforated flat steel (6).

5. The composite chute for pouring secondary lining concrete in tunnels according to claim 4, characterized in that: The other end of the perforated steel pipe (5) has a through hole formed radially. The outer side of the foldable chute body (1) is provided with a side screw (3). The side screw (3) passes through the through hole at the other end of the perforated steel pipe (5) and is fitted with a nut (4). The nut on the side screw (3) is tightened on the perforated steel pipe (5), thereby connecting and fixing the perforated steel pipe (5) to the foldable chute body (1).

6. The composite chute for pouring secondary lining concrete in tunnels according to any one of claims 1-3, characterized in that: The length direction of the reinforcing steel plate (2) is consistent with the length direction of the foldable chute body (1), and a pair of reinforcing steel plates (2) are symmetrically arranged on both sides of the bottom surface of the foldable chute body (1).

7. The composite chute for pouring secondary lining concrete in tunnels according to claim 6, characterized in that: The width of the reinforcing steel plate (2) is one-third of the bottom width of the foldable chute body (1), so that there is a gap between the pair of reinforcing steel plates (2).

8. The composite chute for pouring secondary lining concrete in tunnels according to claim 1, characterized in that: The pair of perforated steel pipes (5) and perforated flat steel (6) of the mounting bracket are located in the same plane, and the plane is perpendicular to the length direction of the foldable chute body (1). Several mounting brackets are arranged at intervals along the length direction of the foldable chute body (1).

9. The composite chute for pouring secondary lining concrete in tunnels according to claim 1 or 8, characterized in that: The foldable chute body (1) is formed by bending EVA waterproof membrane to form a U-shaped chute.

10. A method of using the composite chute for pouring secondary lining concrete in tunnels as described in claim 5, characterized in that: Includes the following steps: Step 1: Attach two reinforcing steel plates (2) to the bottom of the foldable chute body (1), weld steel plate screws (7) to the bottom of the reinforcing steel plates (2), and screw two nuts (4) onto the steel plate screws (7). Step 2: Based on the width of the composite chute unit (12), determine the insertion position of the steel plate screw (7) in the perforated flat steel (6). After the steel plate screw (7) is inserted into the mounting hole of the perforated flat steel (6), tighten the two nuts (4) on the steel plate screw (7) so that the perforated flat steel (6) is fixed on the two reinforcing steel plates (2). Step 3: Insert one end of a pair of perforated steel pipes (5) into the mounting hole of the perforated flat steel (6), so that the side screws (3) on the outer walls of the left and right sides of the foldable chute body (1) pass through the through holes at the other end of the pair of perforated steel pipes (5), and screw them onto the perforated steel pipes (5) with nuts (4), so that the pair of perforated steel pipes (5) are fixed on both sides of the foldable chute body (1); Step 4: The mounting bracket is detachably installed and fixed on the internal steel beam (11) of the secondary lining trolley; the mounting bracket is placed against the discharge port (9) of the secondary lining trolley; Step 5: Through the coordinated arrangement of multiple composite chute units (12), the concrete (10) can be smoothly diverted from the discharge port (9) to the discharge window (13), thereby completing the pouring operation of the secondary lining concrete (10).

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