Superlarge-diameter shield underground butt joint surrounding rock stress monitoring device

Abstract

The utility model discloses a super-large-diameter shield underground butt joint surrounding rock stress monitoring device, and belongs to the technical field of surrounding rock stress monitoring. Comprising a propelling mechanism, a frame structure installed on the propelling mechanism, a transmission mechanism arranged in the frame structure and a plurality of pressure sensors connected to the transmission mechanism. And the plurality of pressure sensors move oppositely or reversely along the radial direction of the supporting pipe under the action of the transmission mechanism. According to the utility model, the sensor can be accurately installed at a specified position through the propelling mechanism, so that deviation in a manual installation process is avoided; and a conical drill bit is arranged in the propelling mechanism, so that the sensor device is helped to move and adjust in a narrow or irregular space.

Description

Technical Field

[0001] This utility model relates to the field of surrounding rock stress monitoring technology, and more specifically to a device for monitoring the surrounding rock stress during underground docking of ultra-large diameter shield tunnels. Background Technology

[0002] With the construction of numerous underground tunnels and roadways, the requirements for working environment safety, especially the stability of the surrounding rock, are constantly increasing. As underground engineering excavation or mining work continues, the stress in the surrounding rock will be redistributed and unloaded deformation will occur. According to the basic principles of the New Austrian Tunneling Method (NATM), a large number of intuitive and reliable measurements and statistical data need to be carried out during the construction process to accurately evaluate the stability of the surrounding rock or judge its dynamic development trend, evaluate the safety of the construction project, prevent the surrounding rock from collapsing, and avoid safety accidents.

[0003] Current technology has shortcomings: When using manual monitoring, if rock fragments fall in the roadway, it will pose a safety hazard to the operators and monitoring equipment; moreover, due to the height of the roadway, it is not convenient for people to quickly monitor various locations in the roadway, resulting in low monitoring efficiency.

[0004] Therefore, automated stress monitoring devices have emerged. For example, CN105606278A describes a borehole monitoring probe for surrounding rock stress field. This probe utilizes a flexible rod to continuously adapt to the deformation of the surrounding rock, maintaining its own usability while simultaneously monitoring the stress field distribution in real time during rock deformation, thus reflecting the stability of the surrounding rock. However, the sensor's position is fixed, meaning the monitoring points cannot be adaptively adjusted to different geological conditions, such as alternating soft and hard rock formations, or complex geological conditions like fissures and faults. Furthermore, it cannot collect stress values ​​from different radial points for data acquisition and comparative analysis. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a stress monitoring device for the surrounding rock of ultra-large diameter shield tunneling underground docking, so as to solve the problems existing in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine in the ground, comprising: a propulsion mechanism; the propulsion mechanism comprises: a support pipe, and a solenoid sleeved on the support pipe; wherein, the forward end of the support pipe is provided with a conical drill bit with a hollow structure;

[0007] The stress monitoring device further includes: a frame structure mounted on the solenoid;

[0008] A transmission mechanism is disposed within the frame structure; the transmission mechanism has at least two sets of output ends.

[0009] Several pressure sensors are installed at the output end; the pressure sensors move in opposite directions or in the opposite direction along the radial direction of the support tube under the action of the transmission mechanism.

[0010] In a further embodiment, the framework structure includes:

[0011] A connecting frame has a connecting groove of a predetermined diameter at its center along the axial direction; the connecting groove is adapted to the solenoid.

[0012] Several guide grooves are radially formed on the outer edge of the connecting frame; the number of the guide grooves corresponds to the output end of the transmission mechanism.

[0013] In a further embodiment, the transmission mechanism includes:

[0014] Several racks are radially movably disposed in corresponding guide grooves; the outer end face of each rack is configured to mount the pressure sensor.

[0015] Several rotating gears are installed axially within the connecting frame; the several rotating gears are correspondingly meshed with adjacent racks.

[0016] In a further embodiment, the support tube is connected to the conical drill bit to form a collection frame.

[0017] In a further embodiment, the transmission mechanism further includes:

[0018] A micro motor is disposed within the connecting frame; the output shaft of the micro motor is drivenly connected to one of the rotating gears.

[0019] In a further embodiment, the transmission mechanism further includes:

[0020] A gear ring is rotatably mounted within the connecting frame; the gear ring simultaneously meshes with a rotating gear.

[0021] A protective ring is fitted onto the outer wall of the gear ring.

[0022] In a further embodiment, the transmission mechanism further includes a guide plate, which is correspondingly mounted on the side wall of the rack.

[0023] In a further embodiment, the outer wall of the support tube and the inner wall of the solenoid are connected by threads.

[0024] In a further embodiment, each set of rotating gears has a predetermined height, and the gear ring and the rack are offset.

[0025] The beneficial effects of this invention are as follows: The device of this invention is equipped with a transmission mechanism, which has at least two sets of output ends and correspondingly installs multiple pressure sensors. These pressure sensors can move in opposite directions or in the opposite direction along the radial direction of the support pipe under the action of the transmission mechanism. This allows for monitoring of the surrounding rock stress from multiple different radial directions. Compared with traditional single-location or unidirectional monitoring methods, it can more comprehensively and accurately obtain the stress situation of the surrounding rock in all directions, which helps to accurately grasp the overall picture of the stress distribution of the surrounding rock during the shield tunneling docking in the ground, and provides detailed and reliable data support for subsequent construction decisions. Since the changes in surrounding rock stress during shield tunneling are complex and comprehensive, the design of this device, which allows for flexible adjustment of sensor positions, can better adapt to different geological conditions and the characteristics of surrounding rock stress changes at different stages of shield tunneling construction. This ensures that stress change information can still be accurately captured in complex and ever-changing underground environments, improving the effectiveness and practicality of monitoring results.

[0026] The propulsion mechanism consists of a support tube and a connected solenoid. The forward end of the support tube is equipped with a hollowed-out conical drill bit. On the one hand, this structure facilitates the device's advancement into the surrounding rock environment for stress monitoring operations. The conical drill bit helps to break through the rock and soil, while the hollowed-out structure avoids excessive compression or other obstructions during the advancement process. On the other hand, the cooperation between the support tube and the solenoid, such as the use of a threaded connection, ensures a stable and reliable structural connection during advancement, guaranteeing that the entire monitoring device can stably reach the designated monitoring position and creating favorable conditions for subsequent accurate stress monitoring. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the stress monitoring device for the underground docking of an ultra-large diameter shield tunnel in Example 1.

[0028] Figure 2 This is an internal structural diagram of the propulsion mechanism in Example 1.

[0029] Figure 3 This is a framework structure diagram of Example 1.

[0030] Figure 4 This is a structural diagram of the transmission mechanism in Example 1.

[0031] Figure 5 This is a partially enlarged view of the transmission mechanism in Example 1.

[0032] Figures 1 to 5The components are labeled as follows: support tube 1, solenoid 2, tapered drill bit 3, spiral groove 4, frame structure 5, pressure sensor 6, transmission mechanism 7, connecting frame 501, connecting groove 502, guide groove 503, mounting hole 504, slot 505, rack 701, guide plate 702, rotating gear 703, micro motor 704, gear ring 705, and protective ring 706. Detailed Implementation

[0033] The present invention will be further analyzed below with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment discloses a stress monitoring device for the surrounding rock during underground docking of an ultra-large diameter shield tunnel, and a propulsion mechanism. Combined with... Figure 2 The propulsion mechanism in this embodiment includes a support tube 1 and a solenoid 2 sleeved on the support tube 1. In this embodiment, the outer wall of the support tube 1 and the inner wall of the solenoid 2 are connected by threads.

[0036] To facilitate the breaking of media such as rock and soil and provide a better monitoring environment for the pressure sensor 6, the forward end of the support tube 1 is equipped with a hollowed-out conical drill bit 3. It is worth mentioning that the side of the conical drill bit 3 is provided with a spiral groove 4 to realize the hollowed-out structure design of the conical drill bit 3.

[0037] Furthermore, the inner wall of the support tube 1 is also a hollow structure, so the support tube 1 is connected to the conical drill bit 3 to form a collection frame, which is used to store dust and impurities during the rock breaking process or monitoring process.

[0038] In a further embodiment, a frame structure 5 is also installed on the solenoid, and a transmission mechanism 7 is provided inside the frame structure 5. The transmission mechanism 7 has at least two sets of output ends, and in this embodiment, there are four sets of output ends. Correspondingly, a pressure sensor 6 is installed at each output end. Therefore, the four sets of pressure sensors 6 move in opposite directions or in the opposite direction along the radial direction of the support pipe 1 under the action of the transmission mechanism 7. In this embodiment, the pressure sensors are signal-connected to the data acquisition unit, and the data from each pressure sensor is output in real time by the data acquisition unit. For example, the wireless access system or network in a multi-parameter roadway surrounding rock dynamic monitoring substation as described in patent CN214464409U can realize the transmission between the pressure sensors and the data acquisition unit in this embodiment.

[0039] By adjusting the radial position of the pressure sensor 6 through opposite or reverse movements, the stress of the surrounding rock can be monitored from multiple different radial directions. Compared with the traditional single-position or single-direction monitoring method, it can obtain the stress situation of the surrounding rock in various directions more comprehensively and accurately.

[0040] like Figure 3 As shown, the frame structure 5 includes a connecting frame 501. It is worth noting that in this embodiment, the connecting frame 501 is a frame with a predetermined thickness, and a connecting groove 502 of a predetermined diameter is formed at its center along the axial direction. The inner wall of the connecting groove 502 is provided with internal threads to realize the connection between the connecting frame 501 and the solenoid. Therefore, external threads are provided at a designated position on the outer wall of the solenoid for easy disassembly. It is also worth mentioning that the threaded connection directions of the connecting frame 501 and the solenoid, and the threaded connection directions of the support tube 1 and the solenoid 2 are the same.

[0041] Furthermore, a plurality of guide grooves 503 are radially formed at the outer edge of the connecting frame 501, and the number and location of the guide grooves 503 correspond to the output end of the transmission mechanism 7. Referring to the above example, in this embodiment, there are four sets of guide grooves 503.

[0042] Combination Figure 4 and Figure 5 In this embodiment, the transmission mechanism 7 consists of four racks 701 that are radially movably disposed within the corresponding guide grooves 503. These four racks 701 are the four output ends mentioned above. Therefore, the outer end faces of the racks 701 are configured to mount the pressure sensor 6.

[0043] In order to increase the stability of the reciprocating motion of the rack 701 in the corresponding guide groove 503, guide plates 702 are respectively arranged on the side wall of the rack 701.

[0044] To synchronously drive the four sensors to perform the same movements, the transmission mechanism 7 further includes four rotating gears 703 mounted axially within the connecting frame 501, each set of rotating gears 703 being meshed with an adjacent rack 701. Furthermore, the rotation shafts of the four rotating gears 703 are correspondingly mounted within four mounting holes 504 in the connecting frame 501.

[0045] One of the rotating gears 703 is equipped with a micro motor 704; in other words, the output shaft of the micro motor 704 is drivenly connected to one of the rotating gears 703. The micro motor 704 is fixed in the slot 505 of the connecting frame 501.

[0046] Correspondingly, the transmission mechanism 7 also includes:

[0047] A gear ring 705 is rotatably mounted within the connecting frame 501; the gear ring 705 also meshes with the rotating gear 703.

[0048] The protective ring 706 is fitted onto the outer wall of the gear ring 705.

[0049] Therefore, in order to ensure that the same rotating gear 703 simultaneously meshes with the gear ring 705 and the rack 701 without spatial interference, each set of rotating gears 703 has a predetermined height, and the gear ring 705 and the rack 701 are staggered.

[0050] Its working principle is as follows: The entire device enters the surrounding rock area to be monitored by means of a propulsion mechanism. The propulsion mechanism consists of a support pipe 1 and a solenoid 2 sleeved on the outside of it. The outer wall of the support pipe 1 and the inner wall of the solenoid 2 are connected by threads. When the solenoid 2 rotates (under the action of external force, its rotation direction is opposite to the direction of the threaded connection between the support pipe 1 and the solenoid 2), the support pipe 1 will be pushed forward axially due to the threaded engagement.

[0051] The transmission mechanism 7 is housed within the frame structure 5. When the device reaches the predetermined monitoring position, the micro motor 704 of the transmission mechanism 7 starts, and its output shaft drives one of the rotating gears 703 connected to it to rotate. The rotation of this rotating gear 703 drives the gear ring 705 that meshes with it to rotate. Because the gear ring 705 meshes with all the rotating gears 703 simultaneously, the gear ring 705 drives all the rotating gears 703 to rotate synchronously. The rotating gears 703 also mesh with adjacent racks 701. Since the racks 701 are radially movable within the guide grooves 503 on the outer edge of the connecting frame 501, the rotation of the rotating gears 703 causes the racks 701 to move radially within the guide grooves 503.

[0052] Several pressure sensors 6 are installed on the outer end face of the rack 701. As the rack 701 moves radially towards or in opposite directions along the support tube 1 under the action of the transmission mechanism 7, the pressure sensors 6 gradually come into contact with the surrounding rock. The pressure sensors 6 convert the sensed surrounding rock pressure into electrical signals and other data, and transmit these data to external monitoring equipment through a corresponding data transmission system. Construction personnel can then use this data to understand the stress condition of the surrounding rock in real time.

[0053] During the device's advancement, the collection frame formed by the connection between the support pipe 1 and the conical drill bit 3 collects soil and rock samples from the surrounding rock. These samples can be used for subsequent analysis of the surrounding rock's composition, physical properties, etc., assisting construction personnel in gaining a more comprehensive understanding of the surrounding rock's characteristics and, in conjunction with stress monitoring data, further accurately assessing the stability of the surrounding rock.

[0054] The guide plate 702 in the transmission mechanism 7 is installed on the side wall of the rack 701, which can ensure that the rack 701 moves smoothly in the guide groove 503, reduce shaking and deviation, and improve the accuracy of transmission. The protective ring 706 is sleeved on the outer wall of the gear ring 705, which can prevent the gear ring 705 from being worn and collided with by impurities, particles and other materials in the surrounding rock, and extend the service life of the transmission mechanism 7.

Claims

1. A stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking, characterized in that, include: Promotion agency; The propulsion mechanism includes: a support tube and a solenoid sleeved on the support tube; wherein, the forward end of the support tube is provided with a conical drill bit with a hollow structure; The stress monitoring device further includes: a frame structure mounted on the solenoid; A transmission mechanism is disposed within the frame structure; the transmission mechanism has at least two sets of output ends. Several pressure sensors are installed at the output end; the pressure sensors move in opposite directions or in the opposite direction along the radial direction of the support tube under the action of the transmission mechanism.

2. The stress monitoring device for the surrounding rock of ultra-large diameter shield tunneling underground docking as described in claim 1, characterized in that, The framework structure includes: A connecting frame has a connecting groove of a predetermined diameter at its center along the axial direction; the connecting groove is adapted to the solenoid. Several guide grooves are radially formed on the outer edge of the connecting frame; the number of the guide grooves corresponds to the output end of the transmission mechanism.

3. The stress monitoring device for the surrounding rock of ultra-large diameter shield tunneling underground docking as described in claim 2, characterized in that, The transmission mechanism includes: Several racks are radially movably disposed in corresponding guide grooves; the outer end face of each rack is configured to mount the pressure sensor. Several rotating gears are installed axially within the connecting frame; the several rotating gears are correspondingly meshed with adjacent racks.

4. The stress monitoring device for the surrounding rock of ultra-large diameter shield tunneling underground docking as described in claim 1, characterized in that, The support tube is connected to the conical drill bit to form a collection frame.

5. A stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking, as described in claim 3, is characterized in that... The transmission mechanism also includes: A micro motor is disposed within the connecting frame; the output shaft of the micro motor is drivenly connected to one of the rotating gears.

6. The stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking according to claim 3, characterized in that, The transmission mechanism also includes: A gear ring is rotatably mounted within the connecting frame; the gear ring simultaneously meshes with a rotating gear. A protective ring is fitted onto the outer wall of the gear ring.

7. A stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking, as described in claim 3, is characterized in that... The transmission mechanism further includes a guide plate, which is correspondingly installed on the side wall of the rack.

8. The stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking according to claim 1, characterized in that, The outer wall of the support tube is threadedly connected to the inner wall of the solenoid.

9. A stress monitoring device for the surrounding rock of an ultra-large diameter shield tunneling machine during underground docking, as described in claim 6, is characterized in that... Each set of rotating gears has a predetermined height, and the gear ring and the rack are offset.

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