Shield receiving steel sleeve device with moving structure and shield receiving construction method

Abstract

The present application relates to the technical field of shield tunnel construction equipment, and discloses a shield receiving steel sleeve device with a mobile structure and a shield receiving construction method, which comprises a steel sleeve main body, a portal connecting assembly, a movable support base, a rear end counterforce support assembly, a sealing and pressure maintaining system and a posture adjusting mechanism. The steel sleeve main body is composed of multiple cylinder units through flange sealing butt joint; the movable support base contains a track assembly and a sliding support; the posture adjusting mechanism realizes accurate adjustment of the three-dimensional posture of the steel sleeve through multiple independent lifting assemblies; and the sealing and pressure maintaining system can maintain the pressure balance in the cylinder in a closed loop. Through modular collaborative design, the present application solves the problems of difficult on-site disassembly, low posture adjustment precision and poor sealing and pressure maintaining effect of the traditional steel sleeve, and is suitable for the construction scenes of water-rich silt stratum, small-diameter shield and close proximity sensitive structures, can effectively prevent and control the risk of water and sand gushing, control stratum settlement, and improve construction efficiency and device reusability.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel construction equipment technology, specifically to a shield receiving steel sleeve device with a movable structure and a shield receiving construction method. Background Technology

[0002] In urban underground tunnel construction, shield receiving is a high-risk procedure in shield tunneling, directly affecting construction safety and the safety of the surrounding environment. Especially in water-rich silty sand, high-pressure water, soft strata, and small-diameter shield tunneling conditions, shield receiving is highly prone to engineering accidents such as water and sand inrush, and excessive ground settlement.

[0003] Existing traditional shield tunneling receiving steel sleeves are mostly fixed installation structures, which have many technical defects in practical engineering applications:

[0004] Firstly, traditional steel sleeves cannot be moved along the tunnel axis after being in place, and the internal space of the working shaft corresponding to small-diameter shield tunnels is usually relatively small, which limits the space for hoisting, relocation, and dismantling operations, resulting in high difficulty and low efficiency in construction operations.

[0005] Secondly, the installation posture of the steel sleeve is difficult to adjust precisely, and the axis of the steel sleeve is prone to deviation from the tunnel boring machine's axis. This can cause the shield to get stuck, or even lead to the failure of the sealing structure due to uneven wear, resulting in the risk of water and sand inrush.

[0006] Third, the reaction support system and the sealing and pressure-maintaining system have poor coordination during the receiving process, and the pressure control accuracy is insufficient. They cannot adapt to the construction requirements of long-distance crossing of sensitive structures and strict settlement control, which can easily cause the settlement of surrounding structures to exceed the limit.

[0007] Fourth, the existing steel sleeve structure has poor versatility and insufficient disassembly and reuse, making it difficult to meet the safe receiving requirements in complex environments such as small-diameter shield tunnels, proximity to subways, bridges, and rivers.

[0008] Therefore, developing a shield receiving steel sleeve device with axial movement function, precise attitude adjustment, and reliable sealing and pressure holding performance is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0009] This invention provides a shield receiving steel sleeve device with a movable structure and a shield receiving construction method. The purpose is to solve the technical problems of traditional steel sleeves, such as difficulty in axial movement, difficulty in attitude adjustment, poor sealing and pressure holding effect, and low safety of small-diameter shield receiving. It is suitable for the stringent construction requirements of water-rich silty sand strata, small-diameter shields, and proximity to sensitive structures.

[0010] The present invention is achieved through the following technical solution.

[0011] The shield receiving steel sleeve device with a movable structure of the present invention includes a steel sleeve body, a portal connection assembly, a movable support base, a rear reaction support assembly, a sealing and pressure holding system, and an attitude adjustment mechanism.

[0012] The main body of the steel sleeve is composed of multiple cylindrical units connected in sequence, and adjacent cylindrical units are connected by flange sealing and fastening.

[0013] The portal connection assembly is fixedly connected to the front end of the steel sleeve body and is used for a sealed connection with the pre-embedded structure of the working shaft portal.

[0014] The movable support base includes a track assembly laid along the axis of the shield tunnel, a sliding support slidably mounted on the track assembly, and a locking assembly for locking the position of the sliding support. The steel sleeve body is supported on the sliding support and can reciprocate along the tunnel axis with the sliding support.

[0015] The rear reaction force support assembly is located at the rear end of the steel sleeve body and is used to provide axial reaction force support for the shield receiving process;

[0016] The attitude adjustment mechanism is used to adjust the vertical height, horizontal offset and axial tilt angle of the steel sleeve body. The attitude adjustment mechanism can move synchronously with the sliding support. The attitude adjustment mechanism includes multiple sets of symmetrically arranged lifting components. The lifting end of the lifting component contacts the outer surface of the steel sleeve body. The attitude adjustment of the steel sleeve body can be realized by independently controlling the displacement of each set of lifting components.

[0017] The sealing and pressure-maintaining system is integrated into the main body of the steel sleeve and is used to inject filling grout into the sleeve and maintain the pressure balance inside the sleeve. The sealing and pressure-maintaining system includes a grouting port, an exhaust port and a pressure monitoring component. The grouting port and the exhaust port are respectively arranged at the lower part and the upper part of the main body of the steel sleeve. The pressure monitoring component is used to collect the grout pressure inside the sleeve in real time.

[0018] The movable support base and sliding support structure enable the steel sleeve to move smoothly back and forth along the tunnel axis, effectively solving the problems of limited space in the working shaft of small-diameter shield tunnels, and difficulties in hoisting, relocation, and dismantling, thus improving the efficiency of construction positioning and dismantling. Multiple independently controlled lifting components form a posture adjustment mechanism, enabling precise three-dimensional adjustment of the steel sleeve's vertical height, horizontal offset, and axial tilt angle, ensuring accurate alignment between the steel sleeve axis and the shield tunneling axis, preventing shield jamming and seal wear failure. An integrated sealing and pressure-maintaining system maintains pressure balance within the sleeve, and, in conjunction with the rear reaction support components, provides stable axial reaction force, forming a complete receiving and protection system. This effectively controls the risk of water and sand inrush in water-rich silty sand strata and meets stringent settlement control requirements. Multi-section sleeve units are connected by flange seals, facilitating modular assembly, disassembly, and recycling on-site, improving the reusability of the device and reducing construction costs.

[0019] Furthermore, the track assembly uses heavy-duty I-beams or rails, which are fixedly laid on the bottom plate of the working shaft. The sliding support includes a support saddle and a slider, with the slider engaging with the track assembly. The top of the support saddle has a groove that matches the bottom of the flange of the steel sleeve body. Using heavy-duty I-beams or rails as the track assembly provides strong load-bearing capacity and high structural rigidity, capable of withstanding the overall weight of the steel sleeve and the tunnel boring machine, ensuring stability during movement. The engaging assembly of the slider and the rail provides good guiding performance and reduces the likelihood of derailment. The groove on the top of the support saddle that matches the bottom of the flange limits the movement of the steel sleeve body, ensuring synchronous movement of the steel sleeve and the sliding support without relative slippage, thus improving the reliability and safety of the movement process.

[0020] Furthermore, the locking component includes multiple sets of positioning pin holes opened along the length of the track component, and through holes opened on the slider for corresponding to the positioning pin holes. After moving into position, rigid locking is achieved by inserting positioning pins into the through holes and positioning pin holes. The rigid locking structure with positioning pins and pin holes has high positioning accuracy and strong locking reliability, and can effectively withstand the axial thrust generated during shield receiving, preventing axial displacement of the steel sleeve body. The structure is simple and easy to operate, requiring no complex operating tools, and is suitable for the working environment of limited space in the well. Multiple sets of positioning pin holes can adapt to different positioning positions, improving the scene adaptability of the device.

[0021] Furthermore, the lifting assembly includes a hydraulic jack, the base of which is fixed to the slider. The lifting end of the hydraulic jack is provided with an arc-shaped contact body that fits the outer surface of the steel sleeve body. Using a hydraulic jack as the lifting actuator provides strong load-bearing capacity, controllable adjustment stroke, and high adjustment precision. By independently controlling the extension and retraction of each set of jacks, the three-dimensional posture of the steel sleeve can be flexibly and precisely adjusted. The arc-shaped contact body at the lifting end has good fit with the arc-shaped outer surface of the steel sleeve, which can increase the contact area, avoid local stress concentration causing damage to the surface of the sleeve, and improve the stability of the steel sleeve during posture adjustment.

[0022] Furthermore, the inner wall of the steel sleeve body is provided with a wear-resistant liner; this prevents the shield body from directly abrading the inner wall of the sleeve, reduces the deformation and wear of the sleeve body, effectively extends the service life of the steel sleeve body, and enhances the reuse value of the device.

[0023] Furthermore, the rear end of the steel sleeve body is sealed with a detachable closed end cap, which is equipped with an inspection door and a transparent observation window. Multiple sets of inspection manholes and grouting reinforcement holes are symmetrically opened on the side walls of the steel sleeve body. The detachable closed end cap facilitates the disassembly and maintenance of the rear end of the steel sleeve, adapting to the needs of different construction scenarios. The transparent observation window allows construction personnel to observe the shield machine's entry status in real time, facilitating timely adjustments to construction parameters. The inspection door and inspection manhole provide access for internal maintenance and cleaning operations, improving operational convenience. The grouting reinforcement holes allow for the injection of reinforcing grout into the surrounding strata after the shield machine has been fully received, further sealing seepage channels, reinforcing the strata, strengthening the water sealing effect, and controlling ground settlement within a smaller range.

[0024] Furthermore, the portal connection assembly includes a transition ring and a portal seal; the front end of the transition ring is sealed and welded to the front flange of the steel sleeve body, and the rear end is used for full welding connection with the pre-embedded steel ring of the working shaft portal; the portal seal adopts a rubber curtain sealing structure or an airbag sealing structure to form a ring seal tightly against the outer wall of the shield machine; the two structures of rubber curtain sealing and airbag sealing are optional and can be flexibly selected according to the ground pressure conditions and shield diameter to adapt to different engineering scenarios; the seal forms a ring dynamic seal tightly against the outer wall of the shield machine, which can effectively block groundwater and quicksand from flowing into the working shaft in water-rich silty sand strata, and prevent the risk of water and sand inrush from the source.

[0025] Furthermore, the rear reaction support assembly includes a reaction support and a reaction strut; the reaction support is pre-embedded and cast in the rear foundation of the working shaft, one end of the reaction strut is hinged to the rear flange of the steel sleeve body, and the other end is connected to the reaction support; the reaction strut adopts a telescopic module; the pre-embedded reaction support is integrated with the working shaft foundation, the foundation has sufficient bearing capacity, and can stably withstand the axial reaction force of the shield receiving; the telescopic reaction strut can adapt to different installation distances and construction errors, and is easy to adjust; the hinged connection can adapt to the small angular deviation of the steel sleeve, ensure uniform force transmission, avoid stress concentration, effectively offset the axial thrust when the shield machine enters the sleeve, prevent the steel sleeve from axial displacement, and ensure the stability and controllability of the receiving process.

[0026] Furthermore, the sealing and pressure-maintaining system also includes a pressure-maintaining pump group connected to the grouting port via a grout delivery pipeline. The pressure-maintaining pump group is signal-connected to the pressure monitoring component and automatically starts and stops based on pressure data to maintain the pressure inside the cylinder slightly higher than the external water and soil pressure. Through the signal linkage between the pressure monitoring component and the pressure-maintaining pump group, closed-loop automatic control of the pressure inside the cylinder is achieved, which can maintain the pressure inside the cylinder slightly higher than the external water and soil pressure in real time, forming a stable pressure balance system, effectively suppressing ground disturbance, preventing water and sand inrush, and meeting the stringent settlement control requirements of nearby sensitive structures. The automatic pressure-maintaining mode reduces the frequency of manual operation, improves the stability and accuracy of pressure control, and reduces the risk of manual operation.

[0027] A shield tunneling receiving construction method, based on the aforementioned shield tunneling receiving steel sleeve device with a movable structure, is characterized by comprising the following steps:

[0028] S1: Lay the track assembly, assemble the main body of the steel sleeve and install it on the sliding support;

[0029] S2: Move the main body of the steel sleeve to the portal position using the movable support base, install the portal connection components and complete the sealing connection;

[0030] S3: Adjust the attitude adjustment mechanism to align and calibrate the axis of the steel sleeve body with the tunnel boring machine axis;

[0031] S4: Install the rear reaction force support component and tighten it securely;

[0032] S5: Start the sealing and pressure-maintaining system, inject grout into the steel sleeve body and purge the air to maintain stable pressure inside the sleeve;

[0033] S6: The tunnel boring machine breaks through the tunnel portal and enters the main body of the steel sleeve to complete the reception;

[0034] S7: After receiving the equipment, depressurize it, remove the rear reaction support components, move the main body of the steel sleeve to the hoisting position, and disassemble and recycle it.

[0035] The beneficial effects of this invention are:

[0036] Significantly improved spatial adaptability: The track-type movable support structure allows the steel sleeve to move back and forth along the tunnel axis, perfectly adapting to the narrow space of the small-diameter shield tunnel working shaft. This solves the pain points of traditional structures, such as difficulty in hoisting and positioning, and inconvenience in disassembly and transportation, greatly improving construction efficiency and operational safety.

[0037] The accuracy and reliability of the receiver are greatly improved: multiple sets of independent and controllable lifting components can achieve precise adjustment of the vertical height, horizontal offset and axis tilt of the steel sleeve, ensuring high-precision alignment between the steel sleeve and the tunnel boring machine axis, and eliminating the hidden dangers of shield entry jamming and seal wear failure from the root.

[0038] It has outstanding risk prevention and control capabilities in complex strata: the closed-loop automatic pressure-maintaining system, combined with the rigid reaction support system, can stably maintain the pressure inside the cylinder slightly higher than the external water and soil pressure, effectively blocking the channels for water and sand inrush in water-rich silt and highly confined water strata, controlling the stratum settlement to the millimeter level, and meeting the stringent settlement control requirements of nearby sensitive structures.

[0039] Enhanced equipment economy and versatility: The cylinder adopts a modular structure with multi-section flange connections, which is convenient for on-site assembly, can be recycled and reused as a whole, and is suitable for various shield diameters and engineering scenarios, significantly reducing the cost of equipment use. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0043] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0044] Figure 3 This is a schematic diagram of the bottom structure of the present invention;

[0045] Figure 4 This is a schematic diagram of the main assembly structure of the steel sleeve of the present invention;

[0046] Figure 5 This is a three-dimensional structural diagram of the movable support base of the present invention;

[0047] Figure 6 This is a schematic diagram of the top structure of the cylindrical unit of the present invention;

[0048] Figure 7 This is a schematic diagram of the bottom structure of the cylindrical unit of the present invention.

[0049] The components are as follows: 1-Steel sleeve body; 11-Cylinder unit; 12-Flange; 13-Wear-resistant liner; 14-Closed end cap; 141-Inspection door; 142-Observation window; 15-Inspection manhole; 16-Grouting reinforcement hole; 2-Tunnel portal connection assembly; 21-Transition ring; 22-Tunnel portal seal; 3-Modible support base; 31-Railway assembly; 311-Positioning pin hole; 32-Sliding support; 321-Support saddle; 322-Slider; 4-Rear end reaction support assembly; 41-Reaction support pipe; 42-Reaction support; 51-Grouting port; 52-Exhaust port; 53-Pressure monitoring assembly; 6-Attitude adjustment mechanism; 61-Hydraulic jack. Detailed Implementation

[0050] The following is combined with Figures 1-7 The present invention will be described in detail below.

[0051] This implementation method uses the Hangzhou Zhongxing 110 kV power transmission and transformation tunnel project (Phase I) as the construction application scenario. It details the installation, commissioning, operation, and collaborative work processes of the device, addressing the stringent conditions of a small-diameter shield tunnel (4.0m inner diameter), water-rich silty sand strata, tunneling over the operational Metro Line 6, tunneling under a permanent river, and being close to the Zhongxing interchange complex.

[0052] like Figures 1-7 As shown, the proposed solution is a shield receiving steel sleeve device with a movable structure. The whole is composed of six core modules: steel sleeve body 1, tunnel portal connection component 2, movable support base 3, rear reaction force support component 4, sealing and pressure holding system, and attitude adjustment mechanism 6. Each module adopts on-site modular assembly and integrated collaborative operation to meet the requirements of safe reception and high-precision settlement control of small diameter shields.

[0053] The steel sleeve body 1 adopts a segmented prefabricated factory and on-site assembly structure, consisting of multiple cylinder units 11 connected sequentially. Adjacent cylinder units 11 are fastened together by high-strength flanges 12 and rubber sealing gaskets with bolts. After assembly, the entire structure undergoes an airtightness test to ensure no leakage. The inner diameter of the steel sleeve body 1 is adapted to the outer diameter of a 4.0m small-diameter tunnel boring machine (TBM), and the inner wall is fully welded with wear-resistant lining plates 13 to reduce frictional resistance during TBM shield advancement and prevent wear and deformation of the inner wall of the cylinder. The rear end of the steel sleeve body 1 is detachably enclosed. End cap 14 is sealed to the rear flange. An inspection door 141 and a transparent observation window 142 are opened in the middle of the end cap. Construction personnel can observe the status of the tunnel boring machine entering the tunnel in real time through the observation window and complete the internal maintenance and cleaning operations through the inspection door. Multiple sets of inspection manholes 15 and grouting reinforcement holes 16 are symmetrically opened on the side wall of the tunnel body. After the tunnel boring machine is fully received and sealed, dual-liquid grout is injected into the stratum around the tunnel entrance through the grouting reinforcement holes 16 to further reinforce the stratum, block the seepage channels, and control the stratum settlement within 5mm.

[0054] Among them, the portal connection component 2 serves as the connection hub between the steel sleeve and the working shaft, and consists of a transition ring 21 and a portal seal 22. The front end of the transition ring 21 is sealed and welded to the front flange of the steel sleeve body 1, and the rear end is fully welded to the pre-embedded steel ring of the working shaft portal to ensure connection rigidity and sealing reliability. The portal seal 22 adopts a rubber curtain seal or an airbag seal structure, which is tightly attached to the outer wall of the shield machine to form a ring seal, completely blocking the inflow of groundwater and quicksand from the water-rich silty sand strata into the working shaft, and preventing the risk of water and sand inrush from the source.

[0055] The movable support base 3 provides axial movement and foundation support for the device. The track assembly 31 is made of heavy-duty I-beams or steel rails, which are precisely laid along the axis of the shield tunnel and fixed to the bottom plate of the working shaft. The track laying deviation is controlled within ±2mm. The track assembly 31 has multiple sets of positioning pin holes 311 along its length, and a travel limit device is installed at the end to prevent the sliding support 32 from overtravel and shifting. The sliding support 32 is welded from the support saddle 321 and the slider 322. The slider 322 is locked on the top surface of the two sets of track assemblies 31. The steel sleeve body 1 can move smoothly back and forth along the axis through the sliding support 32. The slider 322 is provided with through holes to correspond to the positioning pin holes 311. After moving into place, the positioning pin is inserted into the through hole and the positioning pin hole 311 on the slider 322 to complete the rigid locking, which solves the problem of small diameter shield working shaft space and difficulty in hoisting and moving.

[0056] The support saddle 321 is provided with a groove for connecting with the steel sleeve body 1. The bottom of the flange 12 of the steel sleeve body 1 is inserted into this groove, so that when the slider 322 moves, it can drive the steel sleeve body 1 to move together.

[0057] Among them, the rear reaction support component 4 provides axial reaction support for shield receiving. The reaction support 42 is pre-embedded and cast in the rear foundation of the working shaft to ensure that the foundation bearing capacity meets the shield propulsion reaction requirements. The reaction support pipe 41 adopts a telescopic hydraulic support pipe or a combination structure of steel pipe and hydraulic jack. One end is hinged to the rear flange of the steel sleeve body 1, and the other end is pressed against the reaction support 42. The axial thrust generated when the shield enters the tube is transmitted to the working shaft structure through the reaction support pipe 41 to avoid axial displacement of the steel sleeve body 1 and ensure that the receiving process is stable and controllable.

[0058] The attitude adjustment mechanism 6 is arranged on the slider 322 and adopts multiple sets of symmetrically arranged hydraulic jacks 61. Two hydraulic jacks 61 are symmetrically arranged on each slider 322. The jack base is fixed to the slider 322. The top of the jack is detachably equipped with a contact mating body with an arc surface, which can contact and fit with the outer surface of the steel sleeve body 1. By independently controlling the extension and retraction of each set of hydraulic jacks 61, the vertical height, horizontal offset and axial tilt angle of the steel sleeve body 1 can be precisely adjusted in three dimensions. The alignment deviation between the steel sleeve axis and the shield tunneling axis is controlled within ±3mm, which completely avoids problems such as jamming and seal failure when the shield machine enters the sleeve.

[0059] The sealing and pressure-maintaining system is adapted to the high-pressure water and easy-flowing sand characteristics of water-rich silty sand strata. The grouting port 51 and the vent port 52 are respectively arranged at the upper and lower parts of the cylinder. During grouting, the air in the cylinder is first vented through the vent port 52, and then bentonite grout or inert filling grout is injected through the grouting port 51. The pressure monitoring component 53 collects the grout pressure in the cylinder in real time and transmits the pressure data to the construction control console. The pressure-maintaining pump group automatically starts and stops according to the pressure data to maintain the pressure in the cylinder slightly higher than the external water and soil pressure, forming a stable pressure balance system. This effectively suppresses stratum disturbance, prevents water and sand inrush, and meets the stringent settlement control requirements of sensitive structures.

[0060] The shield receiving construction method based on the above-mentioned device specifically includes the following steps:

[0061] S1: Lay and fix the track assembly 31 along the tunnel axis on the bottom plate of the working shaft. At the same time, prefabricate each section of the cylindrical unit 11. In the working shaft, assemble the multiple sections of the cylindrical unit 11 into a steel sleeve body 1 by connecting them with flange bolts. Then, hoist and install the steel sleeve body 1 onto the support saddle 321 of the sliding support 32.

[0062] S2: Drive the sliding support 32 along the track assembly 31 through the traction equipment, move the steel sleeve body 1 to the corresponding position of the tunnel portal, install the transition ring 21 and fully weld it to the pre-embedded steel ring of the tunnel portal, install the tunnel portal sealing component 22, and complete the sealing connection at the tunnel portal.

[0063] S3: Adjust each set of hydraulic jacks 61. By independently adjusting the extension and retraction of each jack, fine-tune the vertical height, horizontal position and axis inclination of the steel sleeve body 1. Align and calibrate the axis of the steel sleeve body with the shield tunneling axis, and control the deviation within ±3mm.

[0064] S4: Install the reaction support pipe 41, connect both ends of the reaction support pipe to the rear flange of the steel sleeve and the pre-embedded reaction support 42 respectively, adjust the length of the reaction support pipe and tighten it to fix it, and complete the installation of the rear reaction support system;

[0065] S5: Start the sealing and pressure-maintaining system, inject bentonite slurry into the steel sleeve body 1 through the grouting port 51, and at the same time, purge the air in the cylinder through the exhaust port 52. The pressure monitoring component 53 is linked with the pressure-maintaining pump group to maintain the pressure in the cylinder at the set value, which is slightly higher than the external water and soil pressure.

[0066] S6: The tunnel boring machine (TBM) excavates and breaks through the tunnel portal according to the set parameters and smoothly enters the interior of the steel sleeve body 1. Construction personnel monitor the entry status of the sleeve in real time through the observation window and complete the TBM receiving operation.

[0067] S7: After the shield tunneling machine is received, the pressure inside the steel sleeve is released, the welded parts of the rear reaction support component 4 and the portal connection component are removed, the locking of the sliding support component is released, the main body 1 of the steel sleeve is moved to the hoisting position in the working shaft, the cylinder unit is disassembled in sections and recycled for reuse.

[0068] This implementation method successfully solves the core problem of receiving small-diameter shield tunnels in water-rich silty sand strata by coordinating five major functions: movement, posture adjustment, sealing, pressure holding, and reaction force. It has achieved safe shield tunneling in the Hangzhou Zhongxing 110 kV power transmission and transformation tunnel project, with ground settlement controlled within 5 mm. It can provide a standardized technical solution for the construction of similar small-diameter shield tunnels and tunnels near sensitive structures.

[0069] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A shield receiving steel sleeve device with a movable structure, characterized in that: It includes a steel sleeve body, a portal connection assembly, a movable support base, a rear reaction support assembly, a sealing and pressure holding system, and an attitude adjustment mechanism; The main body of the steel sleeve is composed of multiple cylindrical units connected in sequence, and adjacent cylindrical units are connected by flange sealing and fastening. The portal connection assembly is fixedly connected to the front end of the steel sleeve body and is used for a sealed connection with the pre-embedded structure of the working shaft portal. The movable support base includes a track assembly laid along the axis of the shield tunnel, a sliding support slidably mounted on the track assembly, and a locking assembly for locking the position of the sliding support. The steel sleeve body is supported on the sliding support and can reciprocate along the tunnel axis with the sliding support. The rear reaction force support assembly is located at the rear end of the steel sleeve body and is used to provide axial reaction force support for the shield receiving process; The attitude adjustment mechanism is used to adjust the vertical height, horizontal offset and axial tilt angle of the steel sleeve body. The attitude adjustment mechanism can move synchronously with the sliding support. The attitude adjustment mechanism includes multiple sets of symmetrically arranged lifting components. The lifting end of the lifting component contacts the outer surface of the steel sleeve body. The attitude adjustment of the steel sleeve body can be realized by independently controlling the displacement of each set of lifting components. The sealing and pressure-maintaining system is integrated into the main body of the steel sleeve and is used to inject filling grout into the sleeve and maintain the pressure balance inside the sleeve. The sealing and pressure-maintaining system includes a grouting port, an exhaust port and a pressure monitoring component. The grouting port and the exhaust port are respectively arranged at the lower part and the upper part of the main body of the steel sleeve. The pressure monitoring component is used to collect the grout pressure inside the sleeve in real time.

2. The shield receiving steel sleeve device with a movable structure according to claim 1, characterized in that: The track assembly uses heavy-duty I-beams or rails and is fixedly laid on the bottom plate of the working well. The sliding support includes a support saddle and a slider. The slider is engaged and assembled on the track assembly. The top of the support saddle is provided with a groove that matches the bottom of the flange of the main body of the steel sleeve.

3. The shield receiving steel sleeve device with a movable structure according to claim 2, characterized in that: The locking component includes multiple sets of positioning pin holes opened along the length of the track component, and through holes opened on the slider for corresponding to the positioning pin holes. After moving into position, rigid locking is achieved by inserting positioning pins into the through holes and positioning pin holes.

4. The shield receiving steel sleeve device with a movable structure according to claim 2 or 3, characterized in that: The lifting assembly includes a hydraulic jack, the base of which is fixed to the slider, and the lifting end of the hydraulic jack is provided with an arc-shaped contact body that is adapted to the outer surface of the steel sleeve body.

5. The shield receiving steel sleeve device with a movable structure according to claim 4, characterized in that: The inner wall of the steel sleeve body is provided with a wear-resistant lining plate.

6. The shield receiving steel sleeve device with a movable structure according to claim 4, characterized in that: The rear end of the steel sleeve body is sealed with a detachable closed end cap, which is equipped with an inspection door and a transparent observation window; the side wall of the steel sleeve body is symmetrically provided with multiple sets of inspection manholes and grouting reinforcement holes.

7. The shield receiving steel sleeve device with a movable structure according to any one of claims 1-3, characterized in that: The portal connection assembly includes a transition ring and a portal seal; the front end of the transition ring is sealed and welded to the front flange of the steel sleeve body, and the rear end is used to fully weld to the pre-embedded steel ring of the working shaft portal; the portal seal adopts a rubber curtain sealing structure or an airbag sealing structure to form an annular seal tightly against the outer wall of the shield machine.

8. The shield receiving steel sleeve device with a movable structure according to any one of claims 1-3, characterized in that: The rear reaction force support assembly includes a reaction force support and a reaction force support pipe; the reaction force support is pre-embedded and cast in the rear foundation of the working well, one end of the reaction force support pipe is hinged to the rear flange of the steel sleeve body, and the other end is connected to the reaction force support; the reaction force support pipe adopts a telescopic module.

9. The shield receiving steel sleeve device with a movable structure according to any one of claims 1-3, characterized in that: The sealing and pressure-maintaining system also includes a pressure-maintaining pump group connected to the grouting port. The pressure-maintaining pump group is signal-connected to the pressure monitoring component and automatically starts and stops according to the pressure data to maintain the pressure inside the cylinder slightly higher than the external water and soil pressure.

10. A shield tunneling receiving construction method, based on the shield tunneling receiving steel sleeve device with a movable structure as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: Lay the track assembly, assemble the main body of the steel sleeve and install it on the sliding support; S2: Move the main body of the steel sleeve to the portal position using the movable support base, install the portal connection components and complete the sealing connection; S3: Adjust the attitude adjustment mechanism to align and calibrate the axis of the steel sleeve body with the tunnel boring machine axis; S4: Install the rear reaction force support component and tighten it securely; S5: Start the sealing and pressure-maintaining system, inject grout into the steel sleeve body and purge the air to maintain stable pressure inside the sleeve; S6: The tunnel boring machine breaks through the tunnel portal and enters the main body of the steel sleeve to complete the reception; S7: After receiving the equipment, depressurize it, remove the rear reaction support components, move the main body of the steel sleeve to the hoisting position, and disassemble and recycle it.

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