Intelligent pouring secondary lining trolley system for large-section tunnel

Abstract

The invention provides an intelligent secondary lining pouring trolley system for a large-section tunnel, which belongs to the technical field of tunnel trolleys and comprises a steel formwork unit used for bearing poured concrete, and a pouring space is formed between the steel formwork unit and the side wall of the tunnel. A plurality of pouring ports are formed in the top position and the positions, close to the bottom, of the two sides of each steel formwork unit; the pouring unit is used for uniformly conveying concrete into the pouring space from the pouring opening; the bag body is laid on the steel formwork unit and is hollow, the expansion distance of the top of the bag body is gradually reduced towards the two sides, and an anti-sticking layer is arranged on the side, close to the side wall of the tunnel, of the bag body; and the driving unit is used for injecting a liquid medium into the bag body to expand the bag body, or extracting the liquid medium to contract the bag body. The forming quality of the concrete arched supporting surface can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel jumbo, and in particular, to an intelligent casting secondary lining jumbo system for large-section tunnels. Background Art

[0002] In the construction of large-section tunnels, intelligent casting secondary lining jumbos are usually used for the secondary lining construction of concrete. Due to the large volume of the jumbo and the large amount of concrete to be cast, the casting and compaction processes are relatively complex. To ensure uniform casting of concrete, a method of gradually casting upward from the bottom slowly is usually adopted. However, this casting method not only takes a long time for casting, but also requires a large number of vibrators to be installed on the steel formwork supported by the jumbo to help compact the concrete during casting and avoid the formation of air holes.

[0003] Despite taking various vibration measures, through long-term practice by the applicant, it is found that after the cement mortar is cast and compacted, there are still some air holes that are not fully compacted inside, and they are very difficult to handle. These air holes will not only significantly affect the forming quality of the concrete arch support surface, but also may reduce the overall strength and durability of the lining structure. The existence of air holes results in insufficient compactness of the concrete, thereby affecting the bonding property and bearing capacity of the secondary lining layer, and ultimately endangering the safety and long-term service performance of the tunnel structure. At the same time, the continuous use of vibrators will impose an additional burden on the structure of the jumbo, thus shortening the service life of the jumbo. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent casting secondary lining jumbo system for large-section tunnels, which can effectively improve the forming quality of the concrete arch support surface.

[0005] The embodiments of the present invention are achieved by the following technical solutions:

[0006] An intelligent casting secondary lining jumbo system for large-section tunnels, characterized in that:

[0007] A steel formwork unit, the steel formwork unit is used to carry the cast concrete, a casting space is formed between the steel formwork unit and the tunnel side wall, and a plurality of casting ports are arranged at the top position of the steel formwork unit and at positions on both sides close to the bottom;

[0008] A casting unit, the casting unit is used to uniformly transport the concrete from the casting port into the interior of the casting space;

[0009] An airbag, the airbag is laid on the steel formwork unit, the airbag is hollowly arranged, and the expansion distance at its top gradually decreases towards both sides, and an anti-sticking layer is arranged on the side of the airbag close to the tunnel side wall;

[0010] A driving unit, which is used to inject a liquid medium into the bladder to make it expand, or extract the liquid medium to make the bladder contract.

[0011] Further, the bladder is divided into a plurality of bladder units from both sides to the top. There are isolation bladder plates arranged between the plurality of bladder units, and the plurality of bladder units are separated from each other by the plurality of isolation bladder plates. The heights of the plurality of isolation bladder plates gradually decrease from the top of the tunnel to both sides, and the plurality of bladder units are respectively controlled to expand or contract by the driving unit.

[0012] Further, a plurality of pulling lines are arranged in the bladder. The pulling lines can be straightened following the expansion of the bladder, and the lengths of the plurality of pulling lines gradually decrease from the top of the tunnel to both sides to limit the deformation amount of the bladder.

[0013] Further, each bladder unit is also divided into a plurality of bladder monomers by the isolation bladder plates. The driving unit includes a pipeline, and the pipeline connects the spaced bladder monomers in series and realizes communication.

[0014] Further, an isolation layer is arranged in each bladder monomer. The isolation layer divides the bladder monomer into two liquid storage spaces. A plurality of linear holes are formed in the isolation layer. When one of the liquid storage spaces expands to a preset size, the linear holes will expand and open accordingly, so that the two liquid storage spaces communicate with each other.

[0015] Further, each isolation layer is thickened on both sides at the position of the linear holes.

[0016] Further, the pipeline includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is communicated with one of the liquid storage spaces, and the liquid outlet pipe is communicated with the two liquid storage spaces in each bladder monomer at the same time.

[0017] Further, the driving unit includes a pulse pump, and the pulse pump is arranged on the liquid inlet pipe.

[0018] Further, a water chiller or a water heater is also arranged on the liquid inlet pipe.

[0019] Further, a flocked rib is arranged on one side of the bladder close to the side wall of the tunnel.

[0020] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0021] 1. By reasonably configuring the position and quantity of the pouring openings, the present invention significantly reduces the number of pouring openings, thereby lowering the construction cost. Meanwhile, during the concrete pouring process, the present invention innovatively injects a liquid medium into the bladder through a driving unit, enabling the bladder to expand or continuously contract, and then effectively realizing the vibration and extrusion of the concrete. During this process, the incompressibility of the liquid medium ensures that the bladder can continuously apply an extrusion force to the concrete, avoiding the problem that the bladder cannot provide effective support due to the compression of the concrete on the bladder, and the shape of the bladder can better disperse the concrete to both sides, ensuring the pouring quality of the concrete on both sides of the formwork in the early stage.

[0022] In addition, the bladder is designed with a relatively large coverage area, which can adapt to different construction requirements and can be appropriately deformed to penetrate into the steel bar gaps, thereby further improving the extrusion efficiency of the concrete, helping to fill the voids in the concrete, preventing the appearance of air holes, and thus improving the compactness of the concrete. The side wall of the bladder is provided with an anti-adhesion layer, which can effectively avoid the adhesion phenomenon between the concrete and the bladder, ensuring that the bladder can be smoothly separated from the concrete during the demoulding process.

[0023] During the entire pouring process, the bladder can provide high-quality protection when the formwork is demoulded, preventing unnecessary deformation or damage to the concrete caused by the rigid pulling between the formwork and the concrete surface. Finally, this innovative design greatly improves the forming quality of the concrete arch support surface, ensures the flatness and strength of the tunnel lining structure, and effectively improves the overall quality and durability of the tunnel structure.

[0024] 2. By arranging multiple pulling wires inside the bladder, the present invention effectively controls the deformation of the bladder during the expansion process. When a liquid medium is injected into the bladder and it expands, the pulling wires can be gradually straightened as the bladder expands, ensuring a certain morphological stability of the bladder during the expansion process. In particular, the length of the pulling wires gradually decreases from the top of the tunnel to both sides. This design can limit the lateral deformation of the bladder during expansion, preventing it from expanding excessively to both sides, and thus ensuring the uniform expansion of the bladder inside the tunnel structure.

[0025] This design effectively reduces the structural deformation of the bladder caused by excessive expansion, improving the pouring quality of the concrete. The control function of the pulling wires enables the bladder to more precisely match the structural shape of the tunnel, avoiding the problem of non-uniform expansion causing the compactness of the concrete. In addition, the arrangement of the pulling wires enables the expansion force of the bladder to be evenly distributed, avoiding stress concentration caused by local excessive expansion, and thus ensuring the uniform vibration compaction of the concrete layer and the stability of the support surface forming. Finally, this design can effectively improve the forming quality of the concrete arch support surface, thereby enhancing the overall strength and durability of the tunnel lining and reducing the risks and costs during the construction process. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the overall structure of the intelligent casting secondary lining trolley system for large-section tunnels provided by the present invention;

[0028] Figure 2 It is a schematic diagram showing the structures of the steel formwork unit and the bladder provided by the present invention;

[0029] Figure 3 It is a schematic diagram showing the structure of a single bladder monomer provided by the present invention;

[0030] Figure 4 It is a schematic diagram showing the structure of the isolation layer inside the bladder monomer provided by the present invention.

[0031] Icons: 1 - steel formwork unit, 11 - casting space, 12 - casting port, 2 - casting unit, 3 - bladder, 31 - anti-adhesion layer, 32 - bladder unit, 321 - bladder monomer, 351 - isolation layer, 3511 - one-hole, 352 - liquid storage space, 33 - isolation bladder plate, 34 - pulling wire, 35 - roughening rib, 4 - driving unit, 41 - pipeline, 411 - liquid inlet pipe, 412 - liquid outlet pipe, 42 - pulse pump, 51 - water chiller, 52 - water heater, 6 - support frame, 61 - guiding device. Specific Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] Embodiment

[0035] The following will be further described with specific embodiments. Refer to Figures 1 - 4As shown in the figure, the present invention is an intelligent casting secondary lining trolley system for large-section tunnels, which includes a steel formwork unit 1 and a support frame 6. The steel formwork unit 1 is used to carry the cast concrete. The steel formwork unit 1 is prefabricated from steel plates in the factory, and the support frame 6 supports the entire steel formwork unit 1. A casting space 11 is formed between the steel formwork unit 1 and the tunnel sidewall, providing sufficient space for concrete casting to ensure the smooth progress of the casting process. Reinforcement bars are tied in the casting space 11 to ensure the overall strength of the concrete. In order to improve construction efficiency, save material costs, and match the overall structure of the bladder 3, several casting ports 12 are provided at the top position of the steel formwork unit 1 and at positions near the bottom on both sides. The setting of multiple casting ports 12 can effectively distribute the concrete evenly, reduce the unevenness during the concrete casting process, and thus improve the overall quality of the lining surface.

[0036] The trolley also includes a guiding device 61, which is used to ensure the smooth operation of the trolley in the tunnel and maintain the correct track. The guiding device 61 can adopt rails, rollers or other common guiding components to ensure that the trolley can be accurately positioned and prevent deviation or instability during the construction process. This design not only improves the operation efficiency of the trolley in the tunnel, but also effectively reduces the construction errors caused by deviation, ensuring the smooth progress of the entire construction process.

[0037] Refer to Figure 1 and Figure 2 As shown in the figure, the casting unit 2 is responsible for evenly transporting the concrete from the casting port 12 into the casting space 11. To achieve this goal, the casting unit 2 usually includes multiple equipment modules such as mixing, conveying, and distributing. The concrete mixing device ensures the uniformity of the concrete. The conveying pump and the conveying pipeline 41 smoothly transport the concrete into the formwork, and the distributing device ensures that the concrete can be evenly distributed in each part of the formwork. The configuration of the casting unit 2 can effectively improve the casting efficiency and avoid structural defects caused by uneven concrete distribution.

[0038] In some embodiments, in order to further improve the casting quality, the casting unit 2 can also be equipped with a pressurizing device. The pressurizing device provides sufficient pressure to ensure that the concrete can fully fill every part of the mold during the casting process, preventing problems such as voids and bubbles that affect the quality of the concrete. This pressurizing device can not only ensure the compactness of the concrete, but also effectively improve the overall strength and durability of the lining layer, avoiding cracks or collapses after the concrete is cast.

[0039] Refer to Figure 1 and Figure 2As shown, the bladder 3 is laid on the steel formwork unit 1 and fixed by bonding with strong glue. The bladder 3 has a hollow structure, and the expansion distance at its top gradually decreases towards both sides. The bladder 3 is provided with through holes through which concrete can pass at the position corresponding to the pouring port 12. This design can effectively seal the steel formwork unit 1 through the expansion and contraction of the bladder 3, prevent concrete leakage during the pouring process, and ensure the integrity and quality of the concrete. The expansion characteristics of the bladder 3 enable it to closely fit the formwork during the pouring process, thereby playing a better sealing role and avoiding the problem of concrete leakage caused by formwork gaps or poor contact.

[0040] It should be emphasized that the expansion distance at the top of the bladder 3 gradually decreases towards both sides, and this design effectively distributes the expansion force to both sides of the bladder 3. During the concrete pouring process, this structure can distribute the concrete more evenly into the steel formwork unit 1, and at the same time, a jitter effect is generated through the expansion and contraction of the bladder 3, further promoting the compaction of the concrete. As the bladder 3 expands towards both sides, it can act on the concrete in a larger range, promoting the uniform distribution and compaction of the concrete in the formwork, reducing the generation of pores and voids, and thus improving the compactness of the concrete and the overall quality of the structure.

[0041] This design also helps the bladder 3 to better contact the concrete during the pouring process, ensuring the compaction effect of the concrete and improving the forming quality of the concrete arch support surface. By reasonably distributing the expansion force, it can more effectively avoid the situation of local non-uniformity or insufficient compaction of the concrete.

[0042] Refer to Figure 4 As shown, an anti-adhesion layer 31 is provided on one side of the surface of the bladder 3 close to the tunnel side wall. The anti-adhesion layer 31 can effectively prevent the adhesion between the bladder 3 and the concrete, enabling the bladder 3 to smoothly separate from the steel formwork unit 1 and the concrete during the entire demoulding process. The anti-adhesion layer 31 is pre-bonded to the bladder 3 to ensure its stable performance during the entire use process. The anti-adhesion layer 31 is usually made of materials such as polytetrafluoroethylene (PTFE) with excellent high-temperature resistance, corrosion resistance, and low-friction characteristics. These materials have excellent demoulding performance and can avoid the adhesion between the bladder 3 and the concrete during the concrete setting process, effectively reducing the construction difficulty caused by adhesion.

[0043] Refer to Figure 1 and Figure 2As shown, the driving unit 4 is used to inject a liquid medium into the bladder 3 to expand the bladder 3, or to contract the bladder 3 by pumping out the liquid medium. The function of the driving unit 4 is to precisely control the expansion and contraction of the bladder 3, thereby regulating the extrusion and support effects of the bladder 3 on the concrete. The liquid medium is usually incompressible and can evenly transmit pressure, ensuring a stable expansion effect and a certain stiffness of the bladder 3. Through the control of the driving unit 4, precise adjustment of the expansion degree of the bladder 3 can be achieved, thereby optimizing the compaction effect of the concrete, improving the density of the concrete, and further enhancing the quality and durability of the tunnel lining structure.

[0044] Among them, the bladder 3 is divided into multiple bladder units 32 from both sides to the top. These bladder units 32 are separated by multiple isolation bladder plates 33 to form structurally independent units. The heights of the multiple isolation bladder plates 33 are designed to gradually decrease from the top of the tunnel to both sides. Such a design helps the bladder 3 maintain a reasonable shape during expansion and avoid out-of-control deformation caused by excessive expansion of the bladder 3. Each bladder unit 32 can be individually controlled by the driving unit 4 to expand or contract according to actual needs, thereby precisely adjusting the pressure and vibration effects required during the pouring process to ensure the uniform distribution and full compaction of the concrete.

[0045] Inside the bladder 3, multiple pulling lines 34 are provided, usually made of strong silk threads such as nylon, to ensure that the pulling lines 34 have sufficient strength during the expansion process. The pulling lines 34 are processed and fixed inside the bladder 3 in advance according to actual needs. The lengths of the pulling lines 34 gradually decrease from the top of the tunnel to both sides, ensuring that the deformation amount of the bladder 3 can be effectively limited during the expansion of the bladder 3 and preventing the bladder 3 from expanding excessively in an undesired direction. In this way, the pulling lines 34 can coordinate the expansion process of the bladder 3, thereby ensuring that its shape and expansion amplitude are maintained within a reasonable range and avoiding affecting the compaction effect of the concrete or disturbing the surrounding structure due to excessive expansion.

[0046] Through the reasonable division of the bladder 3, the adjustment of the height of the isolation plates, and the control of the pulling lines 34, this design not only ensures the stability and controllability of the bladder 3 but also ensures the uniform action of the bladder 3 during the concrete pouring process, effectively improving the density of the concrete, reducing the generation of voids and pores, and significantly enhancing the forming quality and structural strength of the tunnel lining.

[0047] Refer to Figure 2 and Figure 3As shown, each bladder unit 32 is further divided into a plurality of bladder monomers 321 by a separating bladder plate 33. These bladder monomers 321 exist independently within the bladder body 3 and are separated from each other by the separating bladder plate 33. The design of the separating bladder plate 33 not only helps the bladder body 3 maintain a stable shape but also ensures that during the expansion or contraction of each bladder monomer 321, its deformation and expansion amplitude can be precisely controlled, avoiding uneven expansion between different bladder monomers 321 and affecting the ramming effect.

[0048] The driving unit 4 includes a pipeline 41 that connects the spaced-apart bladder monomers 321 in series and enables the communication of the liquid medium. Through this pipeline 41 system, the liquid medium can be injected or withdrawn, thereby controlling the expansion or contraction of the bladder monomers 321. When the liquid medium is injected into the bladder monomers 321, each bladder monomer 321 will expand synchronously. Conversely, when the liquid medium is withdrawn, the bladder monomers 321 will contract simultaneously. By precisely controlling the expansion and contraction of these bladder monomers 321, the ramming effect can be effectively improved, ensuring that the concrete is evenly extruded during the pouring process and avoiding the occurrence of unrammed voids or pores.

[0049] Refer to Figure 3 and Figure 4 As shown, a separating layer 351 is provided within each bladder monomer 321. The separating layer 351 divides the bladder monomer 321 into two independent liquid storage spaces 352. A plurality of linear holes 3511 are provided on the separating layer 351. When one of the liquid storage spaces 352 expands to a preset size, the linear holes 3511 will expand and open accordingly, thereby realizing the communication between the two liquid storage spaces 352. This design can effectively control the flow and distribution of the liquid medium, ensuring that the expansion process of the bladder monomer 321 meets the predetermined working requirements.

[0050] As an alternative embodiment, each separating layer 351 is thickened on both sides of the position of the linear holes 3511, and in particular, the cross-section of the thickened part is in an elliptical structure. In this embodiment, when one of the liquid storage spaces 352 expands, the linear holes 3511 will not immediately expand and open. Only when the internal liquid storage space 352 expands to a certain pressure value will the linear holes 3511 gradually expand and open. This design can effectively delay the communication between the two liquid storage spaces 352, thereby generating a strong pulse effect within the liquid storage space 352.

[0051] The generation of the pulse effect will cause the rapid flow of the liquid medium within the liquid storage space 352, thereby causing the bladder body 3 to expand or contract more violently. This process can enhance the vibration and extrusion effect of the bladder body 3, further improving the ramming degree of the concrete, helping to eliminate the pores in the concrete, and improving the density of the concrete and the stability of the overall structure.

[0052] Refer to Figure 1 andFigure 3 As shown, the pipeline 41 includes a liquid inlet pipe 411 and a liquid outlet pipe 412. The liquid inlet pipe 411 is connected to one of the liquid storage spaces 352 for injecting a liquid medium into the liquid storage space 352; the liquid outlet pipe 412 is connected to the two liquid storage spaces 352 in each bladder monomer 321 at the same time, ensuring that the liquid can quickly flow out from the two liquid storage spaces 352.

[0053] The advantage of this design is that the injection process of the liquid inlet pipe 411 and the drainage process of the liquid outlet pipe 412 cooperate with each other to ensure that the liquid medium can flow efficiently and quickly inside the bladder monomer 321, avoiding the influence on the liquid discharge due to the existence of the one-word holes 3511 on the isolation layer 351. If only relying on the expansion and opening of the one-word holes 3511, it may cause certain obstacles to the liquid flow. Especially in a high-pressure environment, the discharge speed of the liquid may be limited. By the way of the simultaneous operation of the liquid inlet and the liquid outlet pipe 412, the liquid flow rate can be effectively increased, ensuring the uniform distribution and quick discharge of the liquid medium in the liquid storage space 352.

[0054] This structural design not only improves the response speed and deformation accuracy of the bladder 3, but also avoids potential problems caused by poor liquid discharge, ensures the rapid injection and outflow of the liquid, further enhances the vibration effect, helps to efficiently vibrate the concrete, and thus improves the pouring quality and the strength and durability of the concrete structure.

[0055] Refer to Figure 1 As shown, refer to Figure 1 and Figure 2 As shown, the driving unit 4 includes a pulse pump 42. The pulse pump 42 is arranged on the liquid inlet pipe 411. By periodically injecting the liquid medium, the pulse pump 42 generates a pulse effect to increase the expansion or contraction speed of the bladder 3, thereby enhancing the concrete vibration effect. The setting of the pulse pump 42 can significantly improve the vibration ability, ensure the compactness of the concrete. At the same time, its structure is simple, easy to install and maintain, reducing the complexity and cost of the system.

[0056] As an alternative embodiment, a water chiller 51 or a water heater 52 is also arranged on the liquid inlet pipe 411. The introduction of the water chiller 51 or the water heater 52 can be flexibly adjusted according to different environmental conditions and the temperature requirements of the concrete. In summer or high-temperature environments, the water chiller 51 can effectively remove the excessive heat generated in the concrete, avoiding the rapid setting of the concrete due to too high temperature, which affects the vibration effect; while in winter or low-temperature environments, the water heater 52 can heat the liquid medium to maintain the required temperature of the concrete, prevent the concrete from freezing, and ensure the normal pouring and vibration of the concrete.

[0057] Through the comprehensive application of the chiller and the water heater 52, the present invention achieves precise control of the liquid temperature, providing a more reliable and adaptable technical means for concrete construction. This setting not only optimizes the temperature control of the liquid medium but also improves the temperature control ability during the concrete compaction process, ensuring high-quality forming of concrete under different climatic conditions.

[0058] Referring to Figure 2 As shown, in the embodiment of the present invention, a roughening rib 35 is provided on one side of the bladder 3 close to the tunnel side wall. The design of the roughening rib 35 aims to enhance the contact effect between the bladder 3 and the concrete, ensure the tight adhesion of the concrete during the pouring process, and prevent slippage between the bladder 3 and the concrete during the demolding process. Specifically, through its protruding structure, the roughening rib 35 increases the surface area of contact between the bladder 3 and the concrete, thereby effectively improving the adhesion between the concrete and the bladder 3, improving the compactness of the concrete, and enhancing the forming quality of the concrete arch support surface.

[0059] In addition, during the concrete compaction process, the roughening rib 35 can further promote the discharge of air bubbles inside the concrete through local vibration of the concrete, improve its compactness, and reduce the generation of pores. Due to the structural characteristics of the roughening rib 35 and the surface of the bladder 3, this rib not only plays an important role during the pouring and compaction processes but also provides better support during the entire demolding process, preventing defects or uneven compaction on the concrete surface caused by excessive expansion or sliding of the bladder 3.

[0060] During specific implementation, the roughening rib 35 can be manufactured by processes such as molding, injection molding, or other forming processes on the surface of the bladder 3. Its shape can be adjusted according to the structural requirements of the tunnel, for example, using regular linear, dot-like, or grid structures to meet the requirements of different-shaped concrete side walls and support surfaces. When the bladder 3 expands and contacts the concrete, the roughening rib 35 will have close physical contact with the concrete surface, further enhancing the compaction effect of the concrete and ensuring the forming quality and stability of the concrete arch support surface. This design not only improves the compactness of the concrete during the pouring process but also enhances the adhesion between the bladder 3 and the concrete, further improving the construction quality and ensuring the long-term stability and durability of the tunnel lining structure.

[0061] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent casting secondary lining trolley system for large-section tunnels, characterized in that: A steel formwork unit (1), the steel formwork unit (1) is used to carry the cast concrete, a casting space (11) is formed between the steel formwork unit (1) and the tunnel side wall, and a plurality of casting ports (12) are arranged at the top position and the positions near the bottom on both sides of the steel formwork unit (1); A casting unit (2), the casting unit (2) is used to uniformly transport the concrete into the interior of the casting space (11) from the casting ports (12); An airbag (3), the airbag (3) is laid on the steel formwork unit (1), the airbag (3) is hollow, and the expansion distance at its top gradually decreases towards both sides, and an anti-sticking layer (31) is arranged on the side of the airbag (3) close to the tunnel side wall; A driving unit (4), the driving unit (4) is used to inject a liquid medium into the airbag (3) to make it expand, or extract the liquid medium to make the airbag (3) contract.

2. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 1, wherein: The airbag (3) is divided into a plurality of airbag units (32) from both sides to the top, isolation airbag plates (33) are arranged between the plurality of airbag units (32), the plurality of airbag units (32) are separated from each other by the plurality of isolation airbag plates (33), the heights of the plurality of isolation airbag plates (33) gradually decrease from the top of the tunnel to both sides, and the plurality of airbag units (32) are respectively controlled to expand or contract by the driving unit (4).

3. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 2, wherein: A plurality of pulling wires (34) are arranged in the airbag (3), the pulling wires (34) can be straightened following the expansion of the airbag (3), and the lengths of the plurality of pulling wires (34) gradually decrease from the top of the tunnel to both sides to limit the deformation amount of the airbag (3).

4. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 3, characterized in that: Each airbag unit (32) is also divided into a plurality of airbag monomers (321) by the isolation airbag plate (33), the driving unit (4) includes a pipeline (41), and the pipeline (41) connects and communicates the spaced airbag monomers (321) in series.

5. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 4, characterized in that: An isolation layer (351) is arranged in each airbag monomer (321), the isolation layer (351) divides the airbag monomer (321) into two liquid storage spaces (352), a plurality of linear holes (3511) are formed in the isolation layer (351), when one of the liquid storage spaces (352) expands to a preset size, the linear holes (3511) will expand and open accordingly, so that the two liquid storage spaces (352) communicate with each other.

6. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 5, characterized in that: Each isolation layer (351) is thickened towards both sides at the position of the linear hole (3511).

7. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 5, characterized in that: The pipeline (41) includes a liquid inlet pipe (411) and a liquid outlet pipe (412), the liquid inlet pipe (411) communicates with one of the liquid storage spaces (352), and the liquid outlet pipe (412) communicates with the two liquid storage spaces (352) in each airbag monomer (321) at the same time.

8. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 7, wherein: The driving unit (4) includes a pulse pump (42), and the pulse pump (42) is arranged on the liquid inlet pipe (411).

9. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 8, characterized in that: A water chiller (51) or a water heater (52) is further provided on the liquid inlet pipe (411).

10. The intelligent casting secondary lining trolley system for large-section tunnels according to claim 1, characterized in that: Roughened ridges (35) are provided on one side of the bladder (3) close to the tunnel side wall.

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