Split half ring shield starting under segment full state monitoring reaction frame device

Abstract

A kind of whole state monitoring reaction frame device suitable for split half-ring shield starting under segment, reaction frame force support rod is fixed at the rear of reaction frame main frame, steel support segment base one end is fixedly connected with the front of reaction frame main frame, segment weight detector is located in the middle of steel support segment base, piezoresistive pressure sensor instrument is located between reaction frame main frame and half-ring segment, piezoresistive pressure sensor instrument is fixedly connected with reaction frame main frame, perpendicularity test system is located above piezoresistive pressure sensor instrument, perpendicularity test system is fixedly connected with reaction frame main frame, segment internal performance checking assembly is installed on reaction frame main frame for measuring segment internal stress performance.The present application automatically checks the perpendicularity of half-ring segment, tests the pressure on half-ring segment in the direction of shield propulsion, monitors the performance indicators of half-ring segment weight and bearing state, checks the internal mechanical properties of segment, and is simple to operate, recyclable and widely applicable.

Description

Technical Field

[0001] This invention belongs to the field of subway tunnel construction technology, and relates to a reaction frame device for full-state monitoring of segment launching and lowering of a split-type semi-ring shield tunnel, and provides a method for monitoring the performance of segment launching and lowering of a shield tunnel based on this support system. It is mainly used to solve the problem of difficulty in quantifying the performance of segment launching and lowering of shield tunnels in confined spaces. Background Technology

[0002] With the rapid development of urban rail transit, the construction of subway tunnels has become increasingly important. In subway tunnel construction, the shield tunneling method is widely used as an efficient and safe construction method. However, the shield launching process, as a key step in shield tunneling, often encounters numerous problems. Therefore, selecting a safe, reliable, technically feasible, and economically reasonable shield launching method based on the characteristics of the project is of great significance.

[0003] In large cities where subway construction sites are limited, confined working shafts are often used for tunnel boring machine (TBM) launches. This method offers advantages such as reduced investment and smaller footprint. However, compared to small- and medium-diameter earth pressure balance (EPB) TBMs, the confined working shafts significantly impact the construction of micro-slurry balance TBMs. These shafts present disadvantages including higher equipment requirements, greater technical difficulty, higher implementation risks, and lower construction efficiency, leading to challenges in TBM launches. Therefore, careful planning and deployment are crucial to avoid impacting project schedules.

[0004] Meanwhile, when the shield body is lowered into the confined space of the launching shaft for assembly, the space behind it is often insufficient to accommodate the arrangement of subsequent trolleys and other work areas due to the limitations of the shield shaft's length, width, and hoisting holes. Therefore, a special launching method is required to meet the launching requirements. The shield split semi-ring launching method involves connecting the shield machine and the supporting trolleys separately, extending the pipelines and lines, and lowering the shield machine and part of the trolleys into the tunnel. The semi-ring refers to the installation of only half of the negative ring, without installing the top segment, leaving space for hoisting, so that the shield shaft can be hoisted normally during construction.

[0005] Semi-ring launching, as a novel launching method, can ensure construction quality and progress while conducting normal construction in confined spaces, making it well-suited to the needs of current urban subway development. However, because semi-ring launching has a different stress structure than traditional launching, effective stress analysis of the launched semi-ring segments and obtaining specific data can provide efficient guarantees for improving segment safety performance, subsequent normal tunneling, and even the safe operation of the subway. It can also provide parameter guidance for tunnel launching projects in cities with limited construction sites. However, the limited operating space of semi-ring launching makes segment performance testing extremely difficult. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a reaction frame device for full-state monitoring of segments under the launching of a split semi-ring shield machine. Semi-ring launching has the characteristics of high performance requirements for the rear support system, high technical control accuracy requirements for tunneling parameters, high assembly requirements for semi-ring segments, and high construction efficiency. Meanwhile, in view of the problems such as narrow operation space during the semi-ring launching of the shield machine in subway construction and the inability to accurately read various segment data, monitoring and deviation correction of the semi-ring shield segments are carried out.

[0007] The technical solution adopted by the present invention to solve its technical problems is:

[0008] A reaction frame device suitable for full-state monitoring of segments under the launching of a split semi-ring shield machine, comprising a reaction frame main body, reaction frame force-bearing support rods, a steel support segment base, a segment weight detector, a piezoresistive pressure sensor, a verticality test system, and a segment internal performance verification assembly. The reaction frame force-bearing support rods are fixed at the rear of the reaction frame main body. One end of the steel support segment base is fixedly connected to the front of the reaction frame main body. The segment weight detector is located in the middle of the steel support segment base. The piezoresistive pressure sensor is arranged between the reaction frame main body and the semi-ring segment, and is fixedly connected to the reaction frame main body. The verticality test system is located above the piezoresistive pressure sensor, and is fixedly connected to the reaction frame main body. The segment internal performance verification assembly is mounted on the reaction frame main body for measuring the internal mechanical performance of the segments.

[0009] The reaction frame main body functions to support all components of the device, and simultaneously provides reverse pressure for the shield machine to advance forward.

[0010] Further, there are four reaction frame force-bearing support rods in total, and the four bilaterally symmetrical steel rods are respectively arranged on both sides of the rear of the reaction frame main body, so as to ensure the provision of reverse supporting pressure for the shield machine during launching, and ensure that the supporting surface of the reaction frame always remains vertical.

[0011] Still further, the side surface of the steel support segment base is in a "U" shape, one end is connected to the reaction frame main body through bolts, and it is detachable for recycling, functioning to stably mount the semi-ring segments.

[0012] Still further, the segment weight detector performs segmented measurement according to the number of rings of the negative-ring segments, and each segment of the weight monitor is set with a rated segment weight m and a maximum segment load-bearing capacity mmax; m refers to the rated weight of each segment in the semi-ring installation stage, m_segment refers to the self-weight of the semi-ring segment, F refers to the pressure exerted by the supports on both sides on the segment, and the above parameters satisfy the formula m = m_segment - Fy / g; mmax refers to the maximum load-bearing capacity of the segment, m0 refers to the dynamic weight applied to the segment during the entry of large-scale equipment after the completion of semi-ring installation, and the above parameters satisfy the formula mmax = m + m0.

[0013] The piezoresistive pressure sensor uses a piezoresistive resistor, which is composed of small piezoresistive resistors arranged in a regular pattern. The resistance value of different areas will change with the pressure value, thereby reflecting the pressure state of the semi-circular tube segment on the reaction frame.

[0014] The verticality testing system includes an infrared transmitter, an infrared emission angle adjuster, an infrared reflector, and a verticality verification plate. It is a segment verticality testing system installed on the reaction frame for full-state monitoring of the split semi-ring shield tunnel segments at the starting point. The infrared transmitter is located above the varistor and is connected to the main frame of the reaction frame by bolts. After installing a battery inside, it can emit infrared beams outward. The infrared emission angle adjuster is connected to the light source of the infrared transmitter to ensure that the emitted light always changes angle on the same plane. The infrared reflector is made of high-definition mirror material and is directly laid on the cross-section of the semi-ring segment. It can be reused repeatedly and is used to receive the infrared light emitted by the infrared transmitter and reflect it onto the verticality verification plate. The verticality verification plate is located on both sides of the tunnel entrance and is fixed to the tunnel entrance by bolts. It can be installed and removed at any time. The verticality verification plate is marked with a vertical centerline, and there are scales on both sides of the centerline for reading verticality deviation data.

[0015] The internal performance verification assembly of the tube segment includes a connecting rod, a detachable fixing frame, an extension rod, an elastic pressure sensor, and a strain gauge. It is a verification device installed on the main frame of the reaction frame for measuring the internal stress performance of the tube segment.

[0016] The number of segments in the connecting rod is equal to the number of negative rings. Each segment is connected by a threaded rotation. The tail end of the connecting rod is directly welded to a detachable fixing frame. The detachable fixing frame is "X"-shaped and is connected to the rectangular frame of the reaction frame main body using bolts, serving to fix the connecting rod. The extension rod is connected to the connecting rod by threads. Each connecting rod segment has a circumferentially distributed extension rod, which, together with the elastic pressure sensor, verifies the pressure data in each direction inside the semi-ring segment. The elastic pressure sensor, located at the end of the extension rod, is made of micro-elastic rubber material and can deform slightly according to pressure changes. The strain gauge is attached to the surface of the elastic pressure sensor to record its deformation, and calculations are used to determine whether the forces in each direction inside the segment are balanced.

[0017] In this invention, the reaction frame, as an important force-bearing component for shield tunneling, provides strong thrust for shield tunneling and has sufficient rigidity and strength. Through structural innovation of the reaction frame, a reaction frame device suitable for full-state monitoring of tunnel segments under the starting of a split semi-ring shield tunnel is designed, which plays the role of monitoring various performance characteristics of tunnel segments under the starting of a semi-ring tunnel.

[0018] Automatic verticality verification of the semi-ring segment: Infrared transmitters are installed on both sides of the reaction frame. Adjusting the angle, they emit infrared light to the center of the cross-section of each ring segment during the installation of the lower negative ring semi-ring segment at the shield tunneling start. A receiving device is installed on the semi-ring cross-section to receive the infrared signal and reflect it onto the verticality verification plate installed on the shield tunneling start portal. When the verticality meets the requirements, the infrared signal will be received on the centerline of the verticality verification plate; when the verticality does not meet the requirements and a deviation occurs, the determination is based on the measured receiving position. The following formula is used to determine the angle of the left and right verticality deviation of the semi-ring segment along the shield tunneling direction:

[0019]

[0020] After correcting the left and right verticality of the semi-circular tunnel segments in the direction of tunnel boring machine advancement, the following formula is used to determine the angle of verticality offset of the semi-circular tunnel segments:

[0021]

[0022] In the formula:

[0023] Θ1: The angle of left-right vertical offset of the upper half-ring segment in the forward direction;

[0024] Θ2: The angle of vertical offset of the semi-circular segment in the forward direction;

[0025] L x : Distance from the receiving position to the center line;

[0026] L y : Vertical distance from the receiving position to the base point;

[0027] A: The height of the infrared emitter relative to the semi-circular cross-section;

[0028] n 总 Total number of negative rings;

[0029] n0: The ring number where the measurement location is located.

[0030] Automatic inspection of the pressure on the semi-circular tunnel segments in the direction of shield tunneling: As the shield advances, the shield jacks push the semi-circular tunnel segments, generating a reverse pressure on the reaction frame. A piezoresistive pressure sensor is installed at the front of the reaction frame's main body. When the tunnel segment position deviates, the uneven pressure on the reaction frame causes a change in the resistance value of the piezoresistive resistor on the piezoresistive pressure sensor. By analyzing the current data, the specific pressure distribution location is determined, thereby verifying whether the shield's reverse thrust is balanced. This, in turn, verifies whether the reaction frame is under balanced force. Based on the feedback data, the jacking force of the shield is adjusted in a timely manner to ensure uniform stress on the tunnel segments.

[0031] Monitoring the weight and performance indicators of the semi-ring segments under load: The original process of pouring the launching platform in the shield tunneling starting shaft has been upgraded. A steel base that can be directly connected to the reaction frame is used, saving time while installing segment weight detectors on the base. This allows for weight verification of each segment in the negative ring, verifying the weight of the negative ring shield segments throughout the entire shield tunneling semi-ring starting construction process. The pressure of the segment on both sides of the steel base support is obtained by subtracting the verification weight from the segment's own weight. Simultaneously, the dynamic load on the segments caused by the entry of large construction machinery during the installation of the negative ring segments can be monitored in real time.

[0032] Internal mechanical property verification of the tunnel segments: An innovative internal performance verification component for the tunnel segments is installed on the reaction frame. The installation of each ring of the negative ring is accompanied by the installation of a corresponding segment verification device. Four verification and correction rods are arranged around the verification device, and elastic pressure sensors are installed at the ends of the rods. The strain gauges attached to the elastic pressure sensors read the force data at various positions inside the half-ring tunnel segment to check whether they are balanced.

[0033] The device of this invention enables rapid assembly of its components, facilitating the construction process of semi-ring shield tunneling launches in confined launching environments. It achieves full-state monitoring and analysis of the tunnel segments under launch in a semi-ring shield, thereby reducing the impact of insufficient launch shaft space on shield construction under confined launching conditions. Furthermore, after construction, the components of the reaction frame device for full-state monitoring of the semi-ring shield tunnel segments under launch can be disassembled to ensure reuse, providing valuable insights for subway construction in relevant cities.

[0034] The beneficial effects of this invention are mainly reflected in: 1. Automatically checking the verticality of the semi-ring segment; 2. Automatically checking the pressure on the semi-ring segment in the shield tunneling direction; 3. Monitoring the weight of the semi-ring segment and its performance indicators under load; 4. Checking the internal mechanical properties of the segment; 5. Simple operation, recyclability and wide applicability. Attached Figure Description

[0035] Figure 1 This is a side view of the reaction frame device for full-state monitoring of the segments during the initial launch of a split-ring shield tunnel.

[0036] Figure 2 yes Figure 1 Top view of the device shown.

[0037] Figure 3 yes Figure 1 Front view of the device shown.

[0038] Figure 4 yes Figure 1 The device shown is a side view of the monitoring process.

[0039] Figure 5 yes Figure 1Front view of the shown device during the usage and monitoring process.

[0040] Figure 6 is Figure 1 Rear view of the shown device during the usage and monitoring process.

[0041] Figure 7 is a schematic diagram of the verticality test system.

[0042] Figure 8 is a schematic diagram of the segment internal performance verification assembly.

[0043] Figure 9 is a three-dimensional schematic diagram of the tunneling operation of the device.

[0044] Figure 10 is a three-dimensional schematic diagram of the tunneling operation of the device.

[0045] The reference numerals in the accompanying drawings are as follows: 1 denotes the main reaction frame body, 2 denotes the force-bearing support rod of the reaction frame, 3 denotes the steel bracket segment base, 4 denotes the segment weight detector, 5 denotes the piezoresistive pressure sensor, 6 denotes the verticality test system, 601 denotes the infrared emitter, 602 denotes the infrared emission angle adjuster, 603 denotes the infrared reflection plate, 604 denotes the verticality verification plate, 7 denotes the segment internal performance verification assembly, 701 denotes the connecting rod, 702 denotes the detachable fixing frame, 703 denotes the extension rod, 704 denotes the elastic pressure sensor, 705 denotes the strain gauge, and 8 denotes the segment. Detailed Description of the Embodiments

[0046] The present invention is further described below with reference to the accompanying drawings.

[0047] With reference to Figures 1-10 , a full-state monitoring reaction frame device for segments suitable for split semi-ring shield launching comprises a main reaction frame body 1, force-bearing support rods 2 of the reaction frame, a steel bracket segment base 3, a segment weight detector 4, a piezoresistive pressure sensor 5, a verticality test system 6 and a segment internal performance verification assembly 7;

[0048] The main reaction frame body 1 functions to support all components of the device, and simultaneously provides reverse pressure for the forward propulsion of the shield machine.

[0049] There are four force-bearing support rods 2 of the reaction frame in total, and the four bilaterally symmetrical steel rods are respectively arranged on two sides of the rear part of the main reaction frame body 1, which ensures that reverse pressure for launching support is provided for the shield machine, and simultaneously ensures that the supporting surface of the reaction frame always remains vertical.

[0050] The steel bracket segment base 3 has a "U"-shaped side surface, one end of which is connected to the main reaction frame body 1 through bolts and is detachable for recycling, and functions to stably mount the semi-ring segment.

[0051] The segment weight detector 4 is located in the middle of the steel support segment base 3. It measures the weight in segments according to the number of rings of the negative ring segment. Each segment weight detector is equipped with the segment's rated weight m and the segment's maximum load mmax. m is the rated weight of each ring segment during the half-ring installation stage, msegment is the self-weight of the half-ring segment, and F is the pressure exerted on the segment by the supports on both sides. The above parameters conform to the formula m = msegment - Fy / g; mmax is the segment's maximum load, and m0 is the dynamic weight of the segment on the segment during the entry of large equipment after the half-ring installation is completed. The above parameters conform to the formula mmax = m + m0.

[0052] The piezoresistive pressure sensor 5 uses a piezoresistor and is located between the main frame 1 of the reaction frame and the semi-circular tube segment. It is connected to the main frame 1 of the reaction frame by bolts. The piezoresistor is composed of small piezoresistors arranged in a regular pattern. The resistance value of different areas will change with the pressure value, thereby reflecting the pressure state of the semi-circular tube segment on the reaction frame.

[0053] The verticality testing system 6 consists of an infrared transmitter 601, an infrared emission angle adjuster 602, an infrared reflector 603, and a verticality verification plate 604. It is a segment verticality testing system installed on the segment full-state monitoring reaction frame under the starting point of the split semi-ring shield tunnel.

[0054] The infrared emitter 601 is located above the varistor 5 and is connected to the main body frame 1 of the reaction frame by bolts. After a storage battery is installed inside, it can emit an infrared beam.

[0055] The infrared emission angle adjuster 602 is connected to the light source of the infrared emitter 601 to ensure that the emitted light always changes angle on the same plane.

[0056] The infrared reflector 603 is made of high-definition mirror material and is directly laid on the cross-section of the semi-circular tube. It can be reused repeatedly and is used to receive infrared light emitted by the infrared emitter 601 and reflect it onto the verticality calibration plate 604.

[0057] The verticality check plate 604 is located on both sides of the tunnel entrance and is fixed to the entrance with bolts, allowing for easy installation and removal. The verticality check plate is marked with a vertical centerline, and graduations are marked on both sides of the centerline for reading verticality deviation data.

[0058] The internal performance verification component 7 of the tube segment consists of a connecting rod 701, a detachable fixing frame 702, an extension rod 703, an elastic pressure sensor 704, and a strain gauge 705. It is a verification device installed on the main frame 1 of the reaction frame for measuring the internal stress performance of the tube segment.

[0059] The connecting rod 701 has the same number of segments as the negative rings. The segments are connected by a threaded rotation. The tail end of the connecting rod is directly welded to the detachable fixing bracket 702.

[0060] The detachable fixing bracket 702 is "X" shaped and is connected to the inside of the rectangular frame of the reaction frame main body 1 with bolts, serving to fix the connecting rod 701.

[0061] The extension rod 703 is connected to the connecting rod 701 by a thread. Each connecting rod 701 has four extension rods distributed circumferentially. Together with the elastic pressure sensor 704, they verify the pressure data in each direction inside the semi-annular tube segment.

[0062] The elastic pressure sensor 704, located at the end of the extension rod 703, is made of a micro-elastic rubber material and can deform slightly according to pressure changes.

[0063] Strain gauge 705 is attached to the surface of elastic pressure sensor 704 to record the deformation of elastic pressure sensor 704 and calculate whether the forces inside the tube segment are balanced in each direction.

[0064] The implementation process of this embodiment is as follows:

[0065] (1) Initial preparation

[0066] Before the tunnel boring machine (TBM) is transported to the site for assembly, the starting site layout, the reinforcement of the starting shaft end, and the arrangement of the starting base within the starting shaft are carried out first. After the completion of the station end shaft structure, the original construction process, which required the cast-in-place reinforced concrete structure, was upgraded. Based on the design length of the shield tail and shield body, the new steel support starting base 3 was directly installed in front of the tunnel portal. The steel support starting base 3 plays a crucial role in bearing the weight of the TBM and positioning it for starting. The steel support starting base 3 has a significant impact on the accuracy of the initial segment assembly and the final segment assembly. To ensure accuracy and guarantee that the TBM installed on the steel support starting base 3 is aligned with the center of the tunnel portal and consistent with the tunnel axis, the position, direction, and height of the steel support starting base 3 were correctly measured and laid out according to the design axis before processing and manufacturing. During installation, the steel support starting base 3 was hoisted into the shaft for positioning, installation, and welding according to the measured and laid-out baseline.

[0067] (2) Reaction frame installation

[0068] The reaction frame is a steel reaction frame, consisting of two main parts: the main reaction frame 1 and the reaction frame support rod 2. Together, they provide solid support for the shield tunneling machine's launch and ensure that the shield jacks have sufficient counterforce to propel the machine forward. According to design requirements, the main reaction frame 1 is installed in a suitable position and fixedly connected to the steel support launch base 3 using bolts.

[0069] (3) Semi-circular segment verticality test

[0070] After the semi-ring segment is installed, the verticality testing system 6 is adjusted and tested. The infrared emission angle adjuster 602 ensures that the emitted light is always on the same plane, and the emission angle of the infrared emitter 601 is adjusted according to the actual position of the segment to be tested, so that the infrared light source can illuminate the infrared reflector 603 on the upper part of the segment being tested. The infrared reflector 603 receives the infrared signal and reflects it onto the verticality check plate installed on the shield tunnel portal. When the verticality meets the requirements, the infrared signal will be received on the centerline of the verticality check plate; when the verticality does not meet the requirements and a deviation occurs, the determination is based on the measured receiving position. The following formula is used to determine the angle of the left and right verticality deviation of the semi-ring segment along the shield's forward direction:

[0071]

[0072] After correcting the left and right verticality of the semi-circular tunnel segments in the direction of tunnel boring machine advancement, the following formula is used to determine the angle of verticality offset of the semi-circular tunnel segments:

[0073]

[0074] In the formula:

[0075] Θ1: The angle of left-right vertical offset of the upper half-ring segment in the forward direction;

[0076] Θ2: The angle of vertical offset of the semi-circular segment in the forward direction;

[0077] L x : Distance from the receiving position to the center line;

[0078] L y : Vertical distance from the receiving position to the base point;

[0079] A: The height of the infrared emitter relative to the semi-circular cross-section (normally taken as 30cm);

[0080] n 总 Total number of negative rings;

[0081] n0: The ring number where the measurement location is located;

[0082] (4) Pressure monitoring in the tunnel segment advancement direction

[0083] As the tunnel boring machine (TBM) advances, the jacking of the semi-circular tunnel segments by the TBM jacks generates a reverse pressure on the reaction frame main body 1. A piezoresistive pressure sensor 5 is installed at the front of the reaction frame main body 1. When the tunnel segment position deviates, the uneven pressure on the reaction frame main body 1 causes a change in the resistance value of the piezoresistive resistor on the piezoresistive pressure sensor 5. By analyzing the current data, the specific distribution location of the pressure is determined, thereby verifying whether the TBM's reverse thrust is balanced, and further verifying whether the reaction frame is under force balance. Based on the feedback data, the jacking force of the TBM jacks is adjusted in a timely manner to ensure uniform force on the tunnel segments.

[0084] (5) Measurement of segments and load on segments

[0085] A segment weight detector 4 is installed on the steel support launching base 3 to verify the weight of each segment in the negative ring during installation and use. This verifies whether the weight of the shield tunnel segments in the negative ring is within the theoretical range throughout the entire shield tunneling half-ring launching process. Each segment weight monitor is equipped with the segment's rated weight m and the segment's maximum load-bearing capacity m. max m represents the rated weight of each ring segment during the semi-ring installation phase. 管片 The weight of the semi-circular tunnel segment is given by the self-weight of the segment, and the pressure F exerted by the segment on both sides of the steel base support is obtained by subtracting the check weight from the self-weight of the segment. The above parameters conform to the formula m = m 管片 -F y / g. Simultaneously, it can monitor in real time the dynamic load m0 caused to the segments by large construction machinery during the entry of large construction equipment after the negative ring segment installation is completed, where m... max For the maximum load-bearing capacity of the tunnel segment, the above parameters conform to the formula m. max =m+m0.

[0086] (6) Verification of internal mechanical properties of tunnel segments

[0087] An innovative segment internal performance verification component 7 is installed on the reaction frame main frame 1. First, a detachable fixing bracket 702 is installed on the reaction frame main frame 1 for the installation of connecting rods 701. The installation of each segment of the negative ring is accompanied by the installation of the corresponding segment connecting rod 701. The connecting rods 701 are fixed together by screw rotation. Four verification rods are arranged circumferentially on the connecting rods 701. The verification rods are composed of extension rods 703 and elastic pressure sensors 704. The strain gauges 705 attached to the elastic pressure sensors 704 are used to read the force data at various positions inside the semi-ring segment to determine whether they are balanced.

[0088] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A reaction frame device for full-state monitoring of segments during the initial launch of a split-type semi-ring shield tunnel, characterized in that, The device includes a reaction frame main body frame, reaction frame force-bearing support rods, a steel support segment base, a segment weight detector, a piezoresistive pressure sensor, a perpendicularity test system, and a segment internal performance verification assembly. The reaction frame force-bearing support rods are fixed to the rear of the reaction frame main body frame. One end of the steel support segment base is fixedly connected to the front of the reaction frame main body frame. The segment weight detector is located in the middle of the steel support segment base. The piezoresistive pressure sensor is positioned between the reaction frame main body frame and the half-ring segment, and is fixedly connected to the reaction frame main body frame. The perpendicularity test system is located above the piezoresistive pressure sensor, and is fixedly connected to the reaction frame main body frame. The segment internal performance verification assembly is installed on the reaction frame main body frame for measuring the internal force performance of the segment. The segment internal performance verification assembly comprises a connecting rod, a detachable fixing frame, extension rods, elastic pressure sensors, and strain gauges. The number of segments of the connecting rod is equal to the number of negative rings, each segment is connected by threaded rotation, and the tail-end connecting rod is directly welded to the detachable fixing frame. The detachable fixing frame is in an "X" shape, and is connected to the inside of the rectangular frame of the reaction frame main body frame using bolts to fix the connecting rod. The extension rods are connected to the connecting rod by threads, 4 extension rods are annularly distributed on each segment of the connecting rod, and cooperate with the elastic pressure sensors to jointly verify the omnidirectional pressure data inside the half-ring segment. The elastic pressure sensor is located at the end of the extension rod, is made of micro-elastic rubber material, and undergoes slight deformation according to pressure changes. The strain gauge is attached to the surface of the elastic pressure sensor, configured to record the deformation of the elastic pressure sensor, and calculate whether the forces in all directions inside the segment are balanced.

2. The reaction frame device for full-state monitoring of segments during the initial launch of a split-ring shield tunnel as described in claim 1, characterized in that, There are four reaction frame force-bearing support rods in total, four symmetric steel rods on the left and right are respectively arranged on both sides of the rear of the reaction frame main body frame, which ensures to provide the reverse pressure for the shield machine to start supporting, and ensures that the supporting surface of the reaction frame always remains perpendicular.

3. The reaction frame device for full-state monitoring of segments during the initial launch of a split-ring shield tunnel as described in claim 1 or 2, characterized in that, The side surface of the steel support segment base is in a "U" shape, one end is connected to the reaction frame main body frame through bolts, and is detachable for recycling, playing the role of stably installing the half-ring segment.

4. The reaction frame device for full-state monitoring of segments during the initial launch of a split-type semi-ring shield tunnel, as described in claim 1 or 2, is characterized in that... The segment weight detector performs segmented measurement according to the number of rings of the negative ring segment, and each segment of the weight monitor is configured with a segment approved weight m and a segment maximum load-bearing weight mmax.

5. The reaction frame device for full-state monitoring of segments during the initial launch of a split-ring shield tunnel as described in claim 1 or 2, characterized in that, The piezoresistive pressure sensor adopts piezoresistors, which are composed of regularly arranged small piezoresistors. The resistance values of different areas change with the change of pressure values, so as to reflect the pressure state of the half-ring segment acting on the reaction frame.

6. The reaction frame device for full-state monitoring of segments during the initial launch of a split-type semi-ring shield tunnel, as described in claim 1 or 2, is characterized in that... The verticality testing system includes an infrared transmitter, an infrared emission angle adjuster, an infrared reflector, and a verticality verification plate. It is a segment verticality testing system installed on the reaction frame for full-state monitoring of the split semi-ring shield tunnel segments during launch. The infrared transmitter is located above a varistor and is bolted to the main frame of the reaction frame. It emits an infrared beam after installing a battery inside. The infrared emission angle adjuster is connected to the light source of the infrared transmitter, ensuring that the emitted light always changes angle on the same plane. The infrared reflector is made of high-definition mirror material and is directly laid on the cross-section of the semi-ring segment. It is repeatedly used to receive the infrared light emitted by the infrared transmitter and reflect it onto the verticality verification plate. The verticality verification plate is located on both sides of the tunnel entrance and is fixed to the entrance with bolts, allowing for easy installation and removal. The verticality verification plate is marked with a vertical centerline, and graduations are marked on both sides of the centerline for reading verticality deviation data.

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