A prefabricated assembly type TBM arc-shaped segment maintenance device

Abstract

The present application relates to the technical field of tunnel construction equipment, and discloses a prefabricated assembly type TBM arc-shaped segment maintenance device, which comprises an assembly framework, a plurality of prefabricated maintenance warehouses are arranged at mounting positions of the assembly framework, a heat and humidity self-circulation assembly is arranged in the prefabricated maintenance warehouse, a floating support assembly is arranged in the assembly framework, the prefabricated maintenance warehouse is indirectly supported on the assembly framework through the floating support assembly, and a steam injection quick plug assembly is arranged in the prefabricated maintenance warehouse; the heat and humidity self-circulation assembly comprises a steam distribution row, the steam distribution row is mounted at the bottom of the inner wall of the prefabricated maintenance warehouse, and a plurality of Laval nozzles are mounted at the output end of the steam distribution row. The present application realizes the heat and humidity self-circulation based on fluid mechanics without motor, the structural thermal decoupling based on floating support, and the automatic and quick energy connection based on gravity actuation, so that the operation reliability, structural durability and on-site assembly efficiency of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction equipment technology, specifically to a prefabricated assembled TBM arc segment maintenance device. Background Technology

[0002] TBM (Tunnel Boring Machine) arched segments are key components of tunnel lining. Their production process typically requires steam curing to ensure concrete strength. Existing curing devices usually employ a rigid structure where a steel frame is welded to the lining panels. During operation, steam is introduced through external pipes, and internal mechanical fans force the hot, humid air to circulate, maintaining the temperature and humidity environment required for concrete curing. However, existing curing devices have some problems in practical applications.

[0003] First, the internal environmental control components have low reliability and uneven temperature distribution. The curing chamber is in a high-temperature, high-humidity and weakly alkaline environment for a long time. The built-in mechanical fan and its electrical circuit are prone to corrosion or aging, leading to equipment failure. At the same time, the point-source forced air supply method of the mechanical fan can easily create airflow dead zones in the chamber, resulting in uneven temperature distribution, which in turn causes temperature difference cracks in the tube segments.

[0004] Secondly, the overall rigid structure is susceptible to thermal stress damage. Due to the use of an integral welded structure, the high-temperature curing chamber and the load-bearing frame are rigidly connected. During the heating and cooling cycle, the thermal expansion and contraction deformation of the metal material is limited, resulting in the accumulation of thermal stress inside the structure. This can easily cause deformation of the prefabricated curing chamber wall panel or cracking of the weld, affecting the sealing performance and structural safety of the device.

[0005] Finally, on-site assembly and energy connection efficiency is low. Existing equipment relies on manual welding and complex pipeline laying, especially the connection of steam pipelines, which usually requires manual alignment and tightening in narrow spaces, which is time-consuming. This method increases construction costs and is not conducive to the rapid transfer of equipment between different projects. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a prefabricated assembled TBM arc segment maintenance device, which solves the problems of mechanical circulation being prone to failure in harsh environments and uneven temperature field, rigid connection structure being susceptible to thermal stress damage, and low efficiency of on-site assembly and pipeline connection in existing technologies.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated TBM arc segment curing device, comprising an assembly frame, wherein multiple prefabricated curing chambers are provided at the installation positions of the assembly frame, a heat and humidity self-circulation component is provided inside the prefabricated curing chamber, a floating support component is provided inside the assembly frame, the prefabricated curing chamber is indirectly supported on the assembly frame through the floating support component, and a steam injection quick-connect component is provided inside the prefabricated curing chamber; The heat and humidity self-circulation assembly includes a steam distributor, which is installed at the bottom of the inner wall of the prefabricated curing chamber. Multiple Laval nozzles are installed at the output end of the steam distributor. A fixing block is fixedly connected to the rear side of the inner wall of the prefabricated curing chamber. A Coanda guide plate is fixedly connected to the front side of the fixing block. The injection port of the Laval nozzle is vertically upward and close to the front surface of the bottom of the Coanda guide plate.

[0008] Preferably, the prefabricated curing chamber includes a carbon steel layer, a rock wool insulation layer, and a stainless steel layer, wherein the stainless steel layer is disposed inside the carbon steel layer, and a rock wool insulation layer is disposed between the carbon steel layer and the stainless steel layer.

[0009] Preferably, the assembly frame includes multiple mounting brackets and docking brackets, and the multiple docking brackets are interconnected vertically through the mounting brackets. The prefabricated curing compartment is disposed inside the mounting brackets. The top and front sides of the mounting brackets are provided with through holes for passing through pipelines.

[0010] Preferably, the rear side of the Kornda deflector is fixedly connected with longitudinal reinforcing ribs and transverse reinforcing ribs, and the Kornda deflector, the longitudinal reinforcing ribs and the transverse reinforcing ribs are all made of stainless steel.

[0011] Preferably, the internal flow channel of the Laval nozzle is composed of a constriction section, a throat, and an expansion section connected sequentially along the gas flow direction, wherein the cross-sectional area of ​​the throat is smaller than the cross-sectional area of ​​the inlet of the constriction section and the outlet of the expansion section, and the Laval nozzle is made of stainless steel.

[0012] Preferably, the floating support assembly includes multiple self-lubricating sliders, which are arranged in an array and fixedly connected to the bottom of the inner wall of the mounting frame. A buffer gap is provided between the perimeter of the prefabricated curing chamber and the inner wall of the mounting frame, and the buffer gap is filled with a flexible heat-resistant filling layer.

[0013] Preferably, the self-lubricating slider is made of polytetrafluoroethylene (PTFE) material, and the flexible heat-resistant filler layer is made of EPDM rubber material.

[0014] Preferably, the steam injection quick-connect assembly includes a delivery pipe disposed inside the base of the prefabricated curing chamber. The output end of the delivery pipe is fixedly connected to the input end of the steam distributor. The input end of the delivery pipe is fixedly connected to a steam injection quick connector. The steam injection quick connector is fixedly connected to the bottom of the prefabricated curing chamber. A steam quick-connect seat is provided at the bottom of the inner wall of the mounting frame. The steam quick-connect seat has a normally closed valve built in it. When the steam injection quick connector is inserted into the steam quick-connect seat, the normally closed valve is opened.

[0015] Preferably, a positioning column is fixedly connected to the bottom of the inner wall of the mounting frame, and a positioning groove is provided at the bottom of the prefabricated curing chamber, with the positioning column and the positioning groove being interlocked.

[0016] Preferably, the prefabricated curing chamber is slidably connected to a sliding placement rack inside, and a slide rail is fixedly connected to the bottom of the inner wall of the prefabricated curing chamber. The bottom end of the sliding placement rack is slidably connected to the middle of the slide rail.

[0017] This invention provides a prefabricated assembled TBM arc segment curing device. It has the following beneficial effects: 1. This invention achieves motor-free thermal and humidity circulation through a thermal and humidity self-circulation component. By utilizing the jet generated by the Laval nozzle and the wall adhesion effect of the Coanda guide plate, a large-flow circulating airflow that climbs along the wall is formed in the curing chamber. The pure fluid dynamics structure avoids the risk of electrical failure that is prone to occur in mechanical fans under high temperature and high humidity environments. At the same time, the lateral entrainment and bottom Venturi effect are used to improve the airflow mixing efficiency, ensuring the uniformity of the temperature field required for the curing of TBM arc-shaped tube segments.

[0018] 2. This invention achieves thermal decoupling between the prefabricated curing chamber and the assembled frame through floating support components. It uses arrayed PTFE self-lubricating sliders to provide multi-point uniform support for the prefabricated curing chamber, reducing the deformation of the prefabricated curing chamber bottom plate under heavy load. At the same time, the sliders, together with the surrounding flexible heat-resistant filling layer, allow the high-temperature prefabricated curing chamber to slide relative to the low-temperature frame due to thermal expansion, effectively blocking the transmission of thermal stress, preventing structural damage caused by temperature difference, and helping to extend the service life of the equipment.

[0019] 3. This invention achieves rapid assembly and automatic energy connection of the device through the steam injection quick-connect assembly. Utilizing the self-weight of the prefabricated curing chamber, the positioning column is guided and the steam pipeline is opened and connected simultaneously during the hoisting and placement process. The design of the delivery pipe built into the base can preheat the base plate and eliminate the need for manual pipe connection work in confined spaces. By reducing on-site welding and wiring procedures, construction efficiency is improved. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the assembly frame of the present invention; Figure 3 This is a schematic diagram of the internal structure of the prefabricated curing chamber of the present invention; Figure 4 This is a cross-sectional structural diagram of the prefabricated curing chamber of the present invention; Figure 5 This is a schematic diagram of the structure of the Coanda deflector plate of the present invention; Figure 6 This is a cross-sectional structural diagram of the prefabricated curing chamber of the present invention; Figure 7 This is a schematic diagram of the internal structure of the mounting bracket of the present invention; Figure 8 This is a schematic diagram of the bottom structure of the prefabricated curing chamber of the present invention; Figure 9 This is a schematic diagram of the structure of the steam injection quick connector and steam quick connector base of the present invention when connected; Figure 10 This is a schematic diagram of the structure of the TBM arc-shaped tube segment of the present invention placed in a prefabricated curing chamber.

[0021] Among them, 1. Prefabricated curing chamber; 101. Carbon steel layer; 102. Rock wool insulation layer; 103. Stainless steel layer; 2. Assembly frame; 201. Mounting bracket; 202. Connecting bracket; 203. Through hole; 3. Heat and humidity self-circulation assembly; 301. Steam distributor; 302. Laval nozzle; 303. Fixing block; 304. Coanda baffle; 305. Longitudinal reinforcing rib; 306. Transverse reinforcing rib; 4. Floating support assembly; 401. Self-lubricating slider; 402. Flexible heat-resistant filler layer; 5. Steam injection quick-connect assembly; 501. Delivery pipe; 502. Steam injection quick connector; 503. Steam quick connector base; 504. Positioning post; 505. Positioning groove; 6. Sliding rack; 7. Slide rail. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 - Appendix Figure 4This invention provides a prefabricated TBM arc segment curing device, including an assembly frame 2. The installation position of the assembly frame 2 is provided with multiple prefabricated curing chambers 1. The interior of the prefabricated curing chamber 1 is provided with a heat and humidity self-circulation component 3. The interior of the assembly frame 2 is provided with a floating support component 4. The prefabricated curing chamber 1 is indirectly supported on the assembly frame 2 through the floating support component 4. The interior of the prefabricated curing chamber 1 is provided with a steam injection quick-connect component 5. The hot and humid self-circulating assembly 3 includes a steam distributor 301, which is installed at the bottom of the inner wall of the prefabricated curing chamber 1. Multiple Laval nozzles 302 are installed at the output end of the steam distributor 301. A fixing block 303 is fixedly connected to the rear side of the inner wall of the prefabricated curing chamber 1. A Coanda guide plate 304 is fixedly connected to the front side of the fixing block 303. The spray nozzles of the Laval nozzles 302 are vertically upward and are close to the front surface of the bottom of the Coanda guide plate 304.

[0024] Specifically, the steam distribution outlet 301, as a pressure stabilizing container and distribution channel for steam, is made of high-pressure resistant and corrosion-resistant stainless steel pipe. The steam distribution outlet 301 has a sufficiently large internal volume to buffer the incoming steam flow rate, eliminate pressure fluctuations along the flow path, and ensure that the inlet pressure of each Laval nozzle 302 installed on it remains consistent, thereby ensuring the uniformity of the air curtain across the entire width.

[0025] The Kornda deflector 304 is vertically installed above and behind the Laval nozzle 302 array. Its main body is a thin stainless steel plate with a specific aerodynamic curvature. The Kornda deflector 304 presents an inverted J-shape or logarithmic spiral shape with a straight bottom and a curved top in the longitudinal section, and the whole protrudes into the internal space of the prefabricated curing chamber 1. The lower part of the Kornda deflector 304 is mainly a vertical plane or a large radius of curvature arc surface, which gradually transitions to a small radius of curvature arc surface upward. Its top end extends towards the center of the prefabricated curing chamber 1, forming an eave structure that guides the airflow. The Kornda deflector 304 is suspended on the rear wall of the prefabricated curing chamber 1 by the fixing block 303 on the back. The left and right edges of the deflector do not contact the side wall of the prefabricated curing chamber 1, leaving a slit-like lateral suction channel. The lateral suction channel allows the cold air on both sides of the Kornda deflector 304 to be drawn in under the negative pressure of the main jet, improving the efficiency of airflow mixing.

[0026] The outer edge of the Laval nozzle 302 (closer to the inside of the chamber) is tangentially aligned with or slightly offset from the working surface of the bottom of the Coanda guide plate 304 (facing the inside of the chamber). This ensures that the high-speed steam jet can immediately adhere to the surface of the Coanda guide plate 304 at the moment it exits the nozzle and climb upward along the curvature of the guide plate. At the same time, the outer wall of the steam distribution outlet 301 and the Laval nozzle 302, the lower suspended area of ​​the Coanda guide plate 304, and the bottom wall of the prefabricated curing chamber 1 form an open Venturi channel, which uses the negative pressure generated by the jet to draw in the cold air at the bottom of the chamber for circulation.

[0027] Please see the appendix Figure 1 and attached Figure 6 In a preferred embodiment of the present invention, the prefabricated curing chamber 1 includes a carbon steel layer 101, a rock wool insulation layer 102 and a stainless steel layer 103. The stainless steel layer 103 is disposed inside the carbon steel layer 101, and the rock wool insulation layer 102 is disposed between the carbon steel layer 101 and the stainless steel layer 103.

[0028] Specifically, the prefabricated curing chamber 1 adopts a sandwich composite structure for its wall panels to adapt to the high temperature and high humidity curing environment and reduce heat loss. The innermost layer of the prefabricated curing chamber 1 is a stainless steel layer 103, preferably made of 304 or 316L stainless steel sheet, which serves as the inner liner that is in direct contact with steam. Its corrosion resistance prevents the chamber wall from rusting in a weakly alkaline and humid environment. The outermost layer is a carbon steel layer 101, which serves as the outer frame skin and provides structural rigidity. The space between the carbon steel layer 101 and the stainless steel layer 103 is filled with a rock wool insulation layer 102. The rock wool insulation layer 102 has a low thermal conductivity, which blocks the heat transfer from the inner liner to the outer shell, ensuring that the external assembly frame 2 is always in a relatively low temperature state, thus achieving structural thermal isolation.

[0029] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 7 In a preferred embodiment of the present invention, the assembly frame 2 includes multiple mounting frames 201 and docking frames 202. The multiple docking frames 202 are interconnected vertically through the mounting frames 201. The prefabricated curing chamber 1 is disposed inside the mounting frame 201. Through holes 203 are provided on the front and rear sides of the top of the mounting frame 201 for passing through pipelines.

[0030] Specifically, the assembly frame 2 constitutes the load-bearing main body and external protective frame of the entire device. It adopts a standardized modular design. The assembly frame 2 is assembled from multiple rectangular frame structures of mounting frames 201 and docking frames 202. In the vertical direction, the docking frame 202 is located between two adjacent mounting frames 201. The upper and lower adjacent mounting frames 201 are fixed by bolt connection or snap connection to form a multi-layer stacked array structure. This allows the device to flexibly adjust the number of layers according to the production capacity requirements of the TBM arc segment production site, and is easy to disassemble and transport. The prefabricated curing chamber 1, as an independent functional unit, is housed in the internal space defined by the mounting frame 201.

[0031] Through holes 203 are opened on the front and rear sides of the top crossbeam of the mounting bracket 201, penetrating the profile wall of the mounting bracket 201 to form pipeline channels. In practical applications, steam transmission pipelines, temperature sensor cables and control signal cables can all be run through the through holes 203, integrating the pipelines into the frame structure, avoiding the pipelines from hanging messily outside the equipment, and protecting the pipelines from accidental scratches during on-site operations.

[0032] Please see the appendix Figure 3 - Appendix Figure 5 In a preferred embodiment of the present invention, the rear side of the Coanda deflector 304 is fixedly connected with a longitudinal reinforcing rib 305 and a transverse reinforcing rib 306, and the Coanda deflector 304, the longitudinal reinforcing rib 305 and the transverse reinforcing rib 306 are all made of stainless steel.

[0033] Specifically, longitudinal stiffeners 305 and transverse stiffeners 306 are welded to the non-working surface (i.e. the side facing away from the internal space) of the Coanda deflector 304. The longitudinal stiffeners 305 are arranged along the airflow direction, and the transverse stiffeners 306 are arranged along the horizontal width direction. The two intersect to form a grid-like support frame, which improves the overall structural rigidity of the deflector and prevents flutter without damaging the aerodynamic shape of the working surface.

[0034] Please see the appendix Figure 3 and attached Figure 4 In a preferred embodiment of the present invention, the internal flow channel of the Laval nozzle 302 is composed of a constriction section, a throat and an expansion section connected in sequence along the gas flow direction, wherein the cross-sectional area of ​​the throat is smaller than the cross-sectional area of ​​the inlet of the constriction section and the outlet of the expansion section, and the Laval nozzle 302 is made of stainless steel.

[0035] Specifically, multiple Laval nozzles 302 are arranged in a linear array at equal intervals along the axial length of the steam distributor 301, forming a row of upward jet sources. The Laval nozzles 302 are made of 304 or 316L austenitic stainless steel through precision machining to resist the scouring of high-temperature water vapor and the corrosion of weakly alkaline environment. In terms of geometric structure, the Laval nozzles 302 are zoom nozzles, and their internal flow channels include a smoothly connected contraction section, throat and expansion section. The steam is accelerated in the contraction section and reaches the critical velocity in the throat. Then it expands and accelerates in the expansion section to form a high-speed jet. The ejection port axis of the Laval nozzles 302 is perpendicular to the horizontal plane, so that the ejected high-speed steam flow direction is vertically upward.

[0036] Please see the appendix Figure 2 and attached Figure 7 In a preferred embodiment of the present invention, the floating support assembly 4 includes a plurality of self-lubricating sliders 401, which are arranged in an array and fixedly connected to the bottom of the inner wall of the mounting frame 201. A buffer gap is provided between the perimeter of the prefabricated curing chamber 1 and the inner wall of the mounting frame 201, and the buffer gap is filled with a flexible heat-resistant filling layer 402. The self-lubricating sliders 401 are made of polytetrafluoroethylene (PTFE), and the flexible heat-resistant filling layer 402 is made of EPDM rubber.

[0037] Specifically, the self-lubricating slider 401 is made of high-density polytetrafluoroethylene (PTFE) material, which has a low coefficient of friction (typically less than 0.04) and excellent high-temperature resistance.

[0038] Multiple self-lubricating sliders 401 are fixed to the load-bearing crossbeam at the bottom of the mounting frame 201 in a multi-point evenly distributed array layout. For example, self-lubricating sliders 401 are arranged at the midpoint of the long side, the midpoint of the short side, and other key stress areas of the precast curing chamber 1. The array-type multi-point support design reduces the stress span of the bottom plate of the precast curing chamber 1, effectively preventing the bottom plate of the precast curing chamber 1 from collapsing or deflecting when bearing the TBM arc segment mold weighing several tons, ensuring the horizontality of the internal mold placement, and the bottom surface of the precast curing chamber 1 directly rests on the upper surface of all the self-lubricating sliders 401, forming a horizontal load-bearing interface that can slide freely.

[0039] The outer wall size of the prefabricated curing chamber 1 is designed to be smaller than the inner frame size of the mounting frame 201, thereby leaving a buffer gap with a width of 20 mm to 50 mm between the two side walls, and a flexible heat-resistant filling layer 402 is filled in the buffer gap.

[0040] The flexible heat-resistant filling layer 402 is preferably made of EPDM rubber with a closed-cell foam structure. EPDM rubber has excellent water vapor resistance and aging resistance, and can maintain its elasticity without degradation in high temperature and high humidity environments for a long time. The flexible heat-resistant filling layer 402 has good compression rebound characteristics and heat insulation performance. When the prefabricated curing chamber 1 expands outward due to internal steam heating, the flexible heat-resistant filling layer 402 is compressed to absorb the size increase of the prefabricated curing chamber 1, preventing the prefabricated curing chamber 1 from hitting the assembly frame 2 hard. At the same time, the flexible heat-resistant filling layer 402 generates a certain elastic reaction force on the prefabricated curing chamber 1, which plays an anti-torsional damping role and limits the prefabricated curing chamber 1 from excessive rotational displacement. The flexible heat-resistant filling layer 402 can also act as a thermal break insulation layer to block heat from being transferred to the outer assembly frame 2 through air convection or radiation, and maintain the low temperature state of the frame.

[0041] Please see the appendix Figure 7 - Appendix Figure 9 In a preferred embodiment of the present invention, the steam injection quick-connect assembly 5 includes a delivery pipe 501, which is disposed inside the base of the prefabricated curing chamber 1. The output end of the delivery pipe 501 is fixedly connected to the input end of the steam distributor 301. The input end of the delivery pipe 501 is fixedly connected to a steam injection quick connector 502, which is fixedly connected to the bottom of the prefabricated curing chamber 1. A steam quick connector seat 503 is provided at the bottom of the inner wall of the mounting bracket 201. The steam quick connector seat 503 has a normally closed valve built in it. When the steam injection quick connector 502 is inserted into the steam quick connector seat 503, the normally closed valve is opened.

[0042] Specifically, the steam quick-connect bracket 503 serves as the output socket of the steam source and is installed in the central load-bearing area at the bottom of the mounting bracket 201. It is connected to the external main steam pipe through a corrugated pipe or a flexible hose.

[0043] The steam quick-connect fitting 503 can be a female connector of a quick-connect fitting that integrates a one-way shut-off valve core and a return spring. Without external force, the return spring presses the shut-off valve core against the valve seat sealing surface, maintaining a normally closed state to prevent steam leakage. The steam injection quick-connect fitting 502 can be a male connector of a quick-connect fitting, serving as a steam input male connector fixed vertically downwards to the center of the bottom surface of the prefabricated curing chamber 1.

[0044] When the prefabricated curing chamber 1 is hoisted into the mounting frame 201, the steam injection quick connector 502 is inserted into the guide hole of the steam quick connector 503. As the height of the prefabricated curing chamber 1 decreases, the huge self-weight of the prefabricated curing chamber 1 overcomes the resistance of the return spring and the steam pressure, forcibly pushing open the shut-off valve core, thereby connecting the steam supply circuit. At the same time, the inner wall of the steam quick connector 503 is provided with a high-temperature resistant fluororubber O-ring or Glyd ring, which forms a radial seal with the outer wall of the steam injection quick connector 502 before the valve is opened.

[0045] The conveying pipe 501 is horizontally installed in the structural interlayer of the base of the prefabricated curing chamber 1 using a concealed method. This built-in pipe design utilizes the high-temperature steam flowing through it to conduct and radiate preheat the bottom plate of the prefabricated curing chamber 1, preventing condensation from forming on the bottom plate. On the other hand, it avoids the conveying pipe 501 occupying the effective curing space inside the chamber.

[0046] To ensure the uniformity of the jet airflow from the Laval nozzle 302 in the terminal heat and humidity self-circulation assembly 3, the cross-sectional area of ​​the delivery pipe 501 is much larger than the cross-sectional area of ​​the steam distribution channel 301, so as to create a pressure stabilizing cavity effect.

[0047] Please see the appendix Figure 7 - Appendix Figure 9 In a preferred embodiment of the present invention, a positioning post 504 is fixedly connected to the bottom of the inner wall of the mounting frame 201, and a positioning groove 505 is provided at the bottom of the prefabricated curing chamber 1, with the positioning post 504 and the positioning groove 505 being inserted into each other.

[0048] Specifically, the positioning column 504 is made of high-strength solid steel column, which is arranged in an array (e.g., 4 columns) and tightly surrounds the steam quick connector 503. The top of the column is machined into a bullet-shaped or large-cone-angled guide head. During the hoisting and descent process, the positioning column 504 is first inserted into the positioning groove 505 at the bottom of the prefabricated curing chamber 1 to limit the swing freedom of the prefabricated curing chamber 1 in the horizontal plane and complete the coarse positioning. Then, as the prefabricated curing chamber 1 continues to descend smoothly, the steam injection quick connector 502 is precisely inserted into the steam quick connector 503.

[0049] Please see the appendix Figure 3 and attached Figure 10 In a preferred embodiment of the present invention, a sliding placement rack 6 is slidably connected inside the prefabricated curing chamber 1, and a slide rail 7 is fixedly connected to the bottom of the inner wall of the prefabricated curing chamber 1. The bottom end of the sliding placement rack 6 is slidably connected to the middle of the slide rail 7.

[0050] Specifically, the slide rail 7 is made of wear-resistant steel, and the sliding placement rack 6 is set above the slide rail 7. Its bottom is equipped with rollers or sliders that cooperate with the slide rail 7, so that the sliding placement rack 6 can slide back and forth along the slide rail 7 in the depth direction of the prefabricated curing chamber 1. The sliding placement rack 6 adopts a hollow frame structure to stably place the TBM arc segment mold, allowing operators or driving machinery to push or pull the mold into or out of the curing chamber, simplifying the loading and unloading difficulty caused by three-dimensional stacking. At the same time, the hollow design of the sliding placement rack 6 reduces the obstruction of the airflow at the bottom, which is conducive to the circulation of hot and humid air.

[0051] Working principle: The operator uses a lifting device to lift the prefabricated curing chamber 1 to the installation position above the assembly frame 2. During the descent, the positioning column 504 at the bottom of the mounting frame 201 first inserts into the positioning groove 505 at the bottom of the prefabricated curing chamber 1. Since the top of the positioning column 504 is provided with a guide cone surface, its cooperation with the positioning groove 505 prevents the prefabricated curing chamber 1 from deviating in the horizontal plane, realizing the coarse positioning of the prefabricated curing chamber 1 and the assembly frame 2. As the prefabricated curing chamber 1 continues to descend vertically by its own weight, the steam injection quick connector 502 located at the center of the bottom of the chamber aligns with and is inserted into the steam quick connector seat 503 on the mounting frame 201. The weight of the prefabricated curing chamber 1 is greater than the resistance of the return spring in the steam quick connector seat 503, forcing the normally closed valve to open. At the same time as the physical placement, the connection of the steam pipeline is completed. The prefabricated curing chamber 1 is smoothly placed on the array of self-lubricating sliders 401, completing the installation.

[0052] During the curing stage, an external high-temperature steam source enters the conveying pipe 501 inside the base of the precast curing chamber 1 through the steam quick-connect fitting 503 and the steam injection quick-connect fitting 502. As the high-temperature steam flows within the conveying pipe 501, it preheats the bottom plate of the precast curing chamber 1 through heat conduction, preventing condensation buildup due to temperature differences. The steam then enters the steam distributor 301, and the pressurized steam is distributed to each Laval nozzle 302. It is accelerated as it flows through the contraction section, throat, and expansion section, and is ejected vertically upwards from the nozzle. When the high-speed steam jet is ejected, because the nozzle is close to the working surface of the Coanda guide plate 304, the fluid between the jet and the wall is carried away, forming a local low-pressure zone. This causes the jet to deflect under the influence of the environmental pressure difference and adhere closely to the Coanda guide plate. The surface of the flow plate 304 flows upward, generating the Coanda effect. During the upward climb of the high-speed jet, the cold air at the bottom is drawn into the main jet through the Venturi channel below the steam distributor 301, and the cold air on the side is drawn in through the slits on both sides of the Coanda guide plate 304. The mixed hot and humid airflow rises to the top along the curved surface of the Coanda guide plate 304. Guided by the top protruding structure, it turns and flows towards the front of the prefabricated curing chamber 1, forming an airflow that covers the TBM arc-shaped tube mold on the sliding placement rack 6. After the airflow exchanges heat with the tube mold, the temperature decreases and the density increases. It sinks down along the inner wall of the front door and flows back to the bottom, where it is once again drawn in by the Laval nozzle 302 at the bottom, realizing a large-flow hot and humid circulation throughout the chamber without mechanical power drive.

[0053] As the curing process continues, the overall temperature of the prefabricated curing chamber 1 rises, and the stainless steel layer 103 and carbon steel layer 101 expand in volume due to heat. Since the prefabricated curing chamber 1 is located on the polytetrafluoroethylene self-lubricating slider 401, the prefabricated curing chamber 1 can slide freely in all directions with the bottom surface as the center. At this time, the flexible heat-resistant filling layer 402 filled in the buffer gap is squeezed and deformed, absorbing the expansion of the prefabricated curing chamber 1 while blocking the transfer of heat to the assembly frame 2.

Claims

1. A prefabricated assembled TBM arc segment curing device, comprising an assembly frame (2), characterized in that, The mounting position of the assembly frame (2) is provided with multiple prefabricated curing chambers (1). The prefabricated curing chamber (1) is provided with a heat and humidity self-circulation component (3). The assembly frame (2) is provided with a floating support component (4). The prefabricated curing chamber (1) is indirectly supported on the assembly frame (2) through the floating support component (4). The prefabricated curing chamber (1) is provided with a steam injection quick-connect component (5). The heat and humidity self-circulation assembly (3) includes a steam distribution manifold (301), which is installed at the bottom of the inner wall of the prefabricated curing chamber (1). Multiple Laval nozzles (302) are installed at the output end of the steam distribution manifold (301). A fixing block (303) is fixedly connected to the rear side of the inner wall of the prefabricated curing chamber (1). A Coanda guide plate (304) is fixedly connected to the front side of the fixing block (303). The spray nozzle (302) has its spray port vertically upward and is close to the front surface of the bottom of the Coanda guide plate (304).

2. The prefabricated assembled TBM arc-shaped segment curing device according to claim 1, characterized in that, The prefabricated curing chamber (1) includes a carbon steel layer (101), a rock wool insulation layer (102) and a stainless steel layer (103). The stainless steel layer (103) is disposed inside the carbon steel layer (101), and a rock wool insulation layer (102) is disposed between the carbon steel layer (101) and the stainless steel layer (103).

3. The prefabricated assembled TBM arc-shaped segment curing device according to claim 1, characterized in that, The assembly frame (2) includes multiple mounting frames (201) and docking frames (202). The multiple docking frames (202) are connected to each other vertically through the mounting frames (201). The prefabricated curing chamber (1) is located inside the mounting frame (201). The top and front sides of the mounting frame (201) are provided with through holes (203), which are used to run pipelines.

4. The prefabricated assembled TBM arc-shaped segment curing device according to claim 1, characterized in that, The rear side of the Coanda deflector (304) is fixedly connected with a longitudinal reinforcing rib (305) and a transverse reinforcing rib (306). The Coanda deflector (304), the longitudinal reinforcing rib (305) and the transverse reinforcing rib (306) are all made of stainless steel.

5. A prefabricated assembled TBM arc-shaped segment curing device according to claim 1, characterized in that, The internal flow channel of the Laval nozzle (302) is composed of a constriction section, a throat and an expansion section connected in sequence along the gas flow direction, wherein the cross-sectional area of ​​the throat is smaller than the cross-sectional area of ​​the inlet of the constriction section and the outlet of the expansion section, and the Laval nozzle (302) is made of stainless steel.

6. A prefabricated assembled TBM arc-shaped segment curing device according to claim 3, characterized in that, The floating support assembly (4) includes multiple self-lubricating sliders (401), which are arranged in an array and fixedly connected to the bottom of the inner wall of the mounting frame (201). A buffer gap is provided between the periphery of the prefabricated curing chamber (1) and the inner wall of the mounting frame (201), and the buffer gap is filled with a flexible heat-resistant filling layer (402).

7. A prefabricated assembled TBM arc-shaped segment curing device according to claim 6, characterized in that, The self-lubricating slider (401) is made of polytetrafluoroethylene, and the flexible heat-resistant filler layer (402) is made of ethylene propylene diene monomer (EPDM) rubber.

8. A prefabricated assembled TBM arc-shaped segment curing device according to claim 3, characterized in that, The steam injection quick-connect assembly (5) includes a delivery pipe (501), which is located inside the base of the prefabricated curing chamber (1). The output end of the delivery pipe (501) is fixedly connected to the input end of the steam distributor (301). The input end of the delivery pipe (501) is fixedly connected to a steam injection quick connector (502), which is fixedly connected to the bottom of the prefabricated curing chamber (1). A steam quick connector seat (503) is provided at the bottom of the inner wall of the mounting bracket (201). The steam quick connector seat (503) has a normally closed valve built in it. When the steam injection quick connector (502) is inserted into the steam quick connector seat (503), the normally closed valve is opened.

9. A prefabricated assembled TBM arc-shaped segment curing device according to claim 3, characterized in that, The bottom of the inner wall of the mounting bracket (201) is fixedly connected to a positioning column (504), and the bottom of the prefabricated curing chamber (1) is provided with a positioning groove (505). The positioning column (504) and the positioning groove (505) are interlocked.

10. A prefabricated assembled TBM arc-shaped segment curing device according to claim 1, characterized in that, The prefabricated curing chamber (1) is slidably connected to a sliding placement rack (6), and a slide rail (7) is fixedly connected to the bottom of the inner wall of the prefabricated curing chamber (1). The bottom end of the sliding placement rack (6) is slidably connected to the middle of the slide rail (7).

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