An automatic closing model shield tunneling machine cutterhead earth pressure sensor installation device

Abstract

The application discloses an automatic closing type model shield machine cutter disc soil pressure sensor mounting device which is composed of an installation hole sealing mechanism and a sensor mounting mechanism. The installation hole sealing mechanism is fixed on the back of a cutter disc panel, and a circular hole on a fixed plate is concentric with a cutter disc sensor mounting hole. After the sensor mounting mechanism passes through the circular hole on the fixed plate, the sensor mounting mechanism is embedded into the cutter disc sensor mounting hole and fixed on the sensor mounting hole sealing mechanism. After installation is completed, a spring of the sensor mounting hole sealing mechanism is in a compressed state. When sensor replacement is completed and the sensor mounting mechanism is reinstalled, a sealing block is opened by pushing a conical top-in block with the sensor mounting mechanism, and then the sensor mounting mechanism is installed into the cutter disc sensor reserved hole. With rotation of the cutter disc, the conical top-in block falls into soil, a force bearing surface of the soil pressure sensor is in contact with the soil, and continuous monitoring of the cutter disc soil pressure is realized.

Description

TECHNICAL FIELD

[0001] The application relates to a device capable of realizing replacement of a model shield cutter head soil pressure sensor and automatic closure of a sensor mounting hole, and belongs to the technical field of shield testing. BACKGROUND

[0002] In the process of shield tunneling, the stability of the excavation face is crucial to the safety of shield construction, and real-time monitoring of the soil pressure on the excavation face is the key to determining the shield construction parameters and ensuring the stability of the excavation face. At the same time, the disturbance of the stratum in front of the excavation face, the change of the soil pressure, and the matching of the construction parameters are closely related to the size of the pressure on the excavation face, and therefore, stable monitoring of the soil pressure of the shield cutter head is of great significance to shield construction. Tunnel excavation simulation tests are carried out by using model shield machines, and in order to better study the influence of shield tunneling construction on the surrounding environment in the laboratory, many scholars at home and abroad have studied model shield testing machines, such as the earth pressure balance shield device developed by Beijing University of Technology in 2007, the small-diameter slurry balance shield machine developed by He Chuan in 2013, and the small-diameter slurry balance shield developed by Shandong University in 2016. He Chuan (2008, 2014) developed an earth pressure balance shield machine that can simulate the whole process of shield construction, and these shield machines only realize the monitoring of the soil pressure of the earth pressure chamber panel. Beijing University of Technology developed a model shield machine capable of monitoring the soil pressure of the cutter head in 2020, but the soil pressure sensor is fixed on the shield machine cutter head, and it is difficult to replace it during the test process. During shield construction, the soil pressure sensor of the cutter head is continuously rubbed with the soil, which is prone to damage, and it is necessary to replace the damaged soil pressure sensor during the test process. At the same time, when the stratum contains water, the replacement of the soil pressure sensor will cause water loss, and even gushing, and therefore, it is necessary to design a soil pressure sensor mounting device that can easily disassemble the soil pressure sensor and automatically close the mounting hole after disassembly. SUMMARY

[0003] The application aims to provide a device capable of conveniently replacing the soil pressure sensor of a model shield cutter head and automatically closing the sensor mounting hole after disassembly, thereby providing protection for the stable collection of cutter head soil pressure data during shield construction and the safety of shield excavation tests.

[0004] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] An automatic closure type model shield machine cutter head soil pressure box mounting device comprises a mounting hole closing mechanism 1 and a sensor mounting mechanism 2.

[0006] In the sensor mounting mechanism 2: the earth pressure sensor 13 is placed inside the protective shell 14, and the earth pressure sensor 13 is fixed at the top of the protective shell 14 by the sensor fixing part 15, the top of the protective shell 14 is provided with a limiting mechanism to prevent the earth pressure sensor 13 from sliding out of the protective shell 14. The signal line of the earth pressure sensor 13 is led out from the lead hole A19 of the sensor fixing part 15.

[0007] In the mounting hole sealing mechanism 1: the sealing block 6 is embedded in the slide rail 4 and can slide along the slide rail 4, the slide rail 4 is fixed on the position fixing block 3 by the first bolt 5, a group of springs 7 are installed at both ends of the slide rail 4, a group of springs 7 are installed between the counterforce beam 8 and the sealing block 6, and spring limiting rods 9 are arranged inside the springs to prevent the springs 7 from being bent and deformed; one end of the spring limiting rod 9 is fixed on the counterforce beam 8, and the other end is deeply inserted into the reserved hole at the top of the sealing block 6, so that when the sealing block 6 moves up and down, the spring limiting rod 9 can extend in and out of the reserved hole of the sealing block 6.

[0008] The mounting hole sealing mechanism 1 is fixed on the back of the panel of the cutter head 20 by the second bolt 11, and the center hole 10 on the fixing block 3 is concentric with the earth pressure sensor mounting hole of the shield cutter head 20. The sensor mounting mechanism 2 is fixed in the earth pressure sensor mounting hole of the shield cutter head 20 through the mounting hole sealing mechanism 1. The signal line of the earth pressure sensor 13 is led to the rear of the bearing 21 from the lead hole B22 reserved in the shield cutter head 20 and the bearing 21, and then led out from the lead hole B, and then connected with the wireless transmission module 23. After the cutter head driving motor 24 is started, the wireless transmission module 23 rotates synchronously with the shield cutter head 20, avoiding the signal line of the earth pressure sensor being twisted off. The wireless transmission module 23 converts the electrical signal of the earth pressure sensor 13 into a wireless signal and transmits it, which is received by an external receiving device, realizing the monitoring of the earth pressure of the shield cutter head 20.

[0009] When the sensor mounting mechanism 2 is fixed to the mounting hole sealing mechanism 1, the spring 7 is in a compressed state. When replacing a damaged earth pressure sensor, the sensor mounting mechanism 2 is disassembled. Under the action of the spring 7's reaction force, the sealing block 6 moves along the slide rail 4, thereby sealing the mounting hole of the earth pressure sensor on the shield cutterhead 20. After replacing the earth pressure sensor 13 and assembling the sensor mounting mechanism 2, the conical push-in block 25 is placed into the center hole 10 of the fixing block 3. The protruding conical surface of the conical push-in block 25 is the same as the concave conical surface of the sealing block 6. Then, the top of the protective shell 14 of the sensor mounting mechanism 2 is brought into contact with the plane of the conical push-in block 25. The sensor mounting mechanism 2 pushes the conical push-in block 25, causing the sealing block 6 to open. The sensor mounting mechanism 2 is then pushed into the sensor mounting hole of the shield cutterhead 20 and fixed to the fixing block 3 of the mounting hole sealing mechanism 1 with bolts 18. After installation, the conical jacking block 25 reaches the outer side of the shield cutterhead 20 panel. When the shield cutterhead 20 rotates, the soil friction causes the conical jacking block 25 to fall into the soil, and the force-bearing surface of the earth pressure sensor 13 begins to contact the soil, enabling continued monitoring of earth pressure.

[0010] Before the construction of the model tunnel boring machine (TBM), the sensor mounting hole sealing mechanism is fixed to the back of the cutterhead panel with bolts. The circular hole on the fixing plate is concentric with the sensor mounting hole on the cutterhead. The sensor mounting mechanism is connected to the mounting hole sealing mechanism with bolts and fixed inside the sensor mounting hole on the cutterhead. After installation, the spring of the mounting hole sealing mechanism is in a compressed state. If the earth pressure sensor on the cutterhead is damaged during TBM construction, the sensor mounting mechanism can be disassembled. Under the action of the spring reaction force of the mounting hole sealing mechanism, the sealing block moves along the slide rail, thus sealing the sensor mounting hole on the cutterhead. After the earth pressure sensor is replaced and the sensor mounting mechanism is reassembled, a conical jacking block is placed at the front end of the sensor mounting mechanism. By pushing the conical jacking block forward with the sensor mounting mechanism, the sealing block is opened, allowing the sensor mounting mechanism to be installed into the earth pressure sensor mounting hole on the cutterhead. Then, it is fixed to the TBM cutterhead by the mounting hole sealing mechanism. As the TBM cutterhead rotates, the conical jacking block falls into the soil, and the force-bearing surface of the earth pressure sensor contacts the soil, enabling continued monitoring of the earth pressure on the cutterhead.

[0011] This automatic closed-type model shield tunneling machine cutterhead earth pressure sensor installation device can facilitate the replacement of damaged earth pressure sensors on the shield cutterhead.

[0012] This automatic closing model shield machine cutterhead earth pressure sensor installation device can automatically close the installation hole of the earth pressure sensor in the cutterhead during the replacement of a damaged earth pressure sensor, preventing groundwater from flowing into the shield.

[0013] This automatic closing model shield tunneling machine cutterhead earth pressure sensor installation device facilitates the installation of the sensor mounting mechanism on the shield cutterhead after the earth pressure sensor is replaced. During the installation process, it can protect the force-bearing surface of the earth pressure sensor and prevent damage to the earth pressure sensor due to excessive installation thrust. Attached Figure Description

[0014] Figure 1 This is an overall view of the soil pressure sensor mounting device described in this invention.

[0015] Figure 2 This is an overall view of the sensor mounting hole sealing mechanism described in this invention.

[0016] Figure 3 This is an overall view of the soil pressure sensor installation mechanism described in this invention.

[0017] Figure 4 This is a side view of the soil pressure sensor mounting mechanism described in this invention.

[0018] Figure 5 This is an exploded view of the earth pressure sensor installation mechanism described in this invention.

[0019] Figure 6 This is a diagram of the shield cutterhead installation of the earth pressure sensor installation device described in this invention.

[0020] Figure 7 This is a diagram showing the location of the earth pressure sensor installation device described in this invention on the cutterhead of a tunnel boring machine.

[0021] Figure 8 This is a diagram showing the arrangement of earth pressure sensors on the cutterhead of the model tunnel boring machine described in this invention.

[0022] Figure 9 This is an overall view of the model shield tunneling machine excavation system in this invention.

[0023] Figure 10 This is a diagram illustrating the installation process of the earth pressure sensor installation device described in this invention. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings:

[0025] like Figures 1-4 As shown, the automatic closing model shield tunneling machine cutterhead earth pressure box installation device of the present invention includes: a mounting hole sealing mechanism 1 and a sensor installation mechanism 2.

[0026] like Figure 5The diagram shown is an exploded view of the soil pressure sensor mounting mechanism of the present invention. The sensor mounting mechanism 2 consists of a protective shell 14, a sensor fixing member 15, a first sealing ring 16, and a second sealing ring 17. The soil pressure sensor 13 is placed inside the protective shell 14 and fixed to the top of the protective shell 14 by the sensor fixing member 15. A limiting mechanism is provided at the top of the protective shell 14 to prevent the soil pressure sensor 13 from sliding out of the protective shell 14. The signal line of the soil pressure sensor 13 is led out from the lead hole A19 of the sensor fixing member 15. The connection between the sensor fixing member 15 and the protective shell 14 is provided with a first sealing ring 16 and a second sealing ring 17.

[0027] like Figure 6 The diagram shows the installation of the shield cutterhead of the earth pressure sensor installation device according to the present invention. The mounting hole sealing mechanism 1 includes a fixing block 3, a sealing block 6, a slide rail 4, a spring 7, and a reaction beam 8. The slide rail 4 is fixed to the fixing block 3 by bolts 5, and the sealing block 6 is embedded inside the slide rail 4 and can slide along the slide rail 4. The reaction beam 8 is installed at both ends of the slide rail 4, and a set of springs 7 is installed between the reaction beam 8 and the sealing block 6. At the same time, a spring limiting rod 9 is provided inside the spring to prevent the spring 7 from bending and deforming. One end of the spring limiting rod 9 is fixed to the reaction beam 8, and the other end extends into the reserved hole at the top of the sealing block 6. When the sealing block 6 moves up and down, the spring limiting rod 9 can extend into and out of the reserved hole of the sealing block 6.

[0028] like Figure 7 The diagram shows the position of the earth pressure sensor mounting device of the present invention on the shield cutterhead. After the sensor mounting mechanism 2 is assembled, it is connected to the mounting hole 12 by bolts 18, fixing the sensor mounting mechanism 2 to the earth pressure sensor mounting hole sealing mechanism 1. At this time, the spring 7 is in a compressed state. After the sensor mounting mechanism 2 is disassembled, under the action of the reaction force of the spring 7, the sealing block 6 moves along the slide rail 4, thereby sealing the earth pressure sensor mounting hole of the shield cutterhead 20.

[0029] like Figure 8 This is a diagram showing the arrangement of earth pressure sensors on the cutterhead of a model tunnel boring machine according to the present invention. The mounting hole sealing mechanism 2 is fixed to the back of the cutterhead 20 panel by bolts 11. The center hole 10 on the fixing block 3 is concentric with the earth pressure sensor mounting hole of the cutterhead 20. The sensor mounting mechanism 2 is fixed inside the sensor mounting hole of the cutterhead 20 by the earth pressure sensor mounting hole sealing mechanism 1.

[0030] like Figure 9The diagram shows an overall view of the tunnel boring machine excavation system in this invention. The signal line of the earth pressure sensor 13 is led from the lead hole B22 reserved in the cutterhead 20 and bearing 21 to the rear of the bearing 21, and then leads out from the outlet hole to connect with the wireless transmission module 23. After the cutterhead drive motor 24 starts, the wireless transmission module 23 rotates synchronously with the cutterhead 20, preventing the earth pressure sensor signal line from being twisted. The wireless transmission module 23 converts the electrical signal of the earth pressure sensor 13 into a wireless signal and transmits it, which is received by an external receiving device, thus realizing the monitoring of the earth pressure on the cutterhead 20.

[0031] like Figure 10 The diagram shows the installation process of the earth pressure sensor installation device of the present invention. After replacing the earth pressure sensor 13 and assembling the sensor installation mechanism 2, the conical jacking block 25 is placed into the central hole 10 of the fixing block 3. The protruding conical surface of the conical jacking block 25 is the same as the concave conical surface of the sealing block 6. Then, the top of the protective shell 14 of the sensor installation mechanism 2 is brought into contact with the plane of the jacking block. The conical jacking block 25 is pushed by the sensor installation mechanism 2, causing the sealing block 6 to open. The earth pressure sensor installation mechanism 2 is then pushed into the sensor installation hole of the shield cutterhead 20 and fixed to the fixing block 3 of the installation hole sealing mechanism 1 with bolts 18. After installation, the conical jacking block 25 reaches the outside of the shield cutterhead 20 panel. When the shield cutterhead 20 rotates, the soil friction causes the conical jacking block 25 to fall into the soil, and the force-bearing surface of the earth pressure sensor 13 begins to contact the soil, enabling continued monitoring of earth pressure.

Claims

1. An automatic closure type model shield machine cutterhead earth pressure sensor mounting device, characterized by, The utility model relates to a shield cutter disc soil pressure sensor installation hole sealing mechanism, including: Mounting hole sealing mechanism (1) and sensor installation mechanism (2);Sensor installation mechanism (2) is fixed on mounting hole sealing mechanism (1) through bolt; Mounting hole sealing mechanism (1) includes fixed block (3), slide rail (4), slide rail fixed bolt (5), sealing block (6), spring (7), counterforce beam (8), limiting rod (9);The center of fixed block (3) is equipped with center hole (10), is equipped with mounting hole (12) along the circumference of center hole (10);Slide rail (4) is fixed on fixed block (3) through bolt, sealing block (6) is embedded inside slide rail (4) and can slide along slide rail (4);The both ends of slide rail (4) are installed with counterforce beam (8), spring (7) is installed between counterforce beam (8) and sealing block (6), and limiting rod (9) is arranged in spring (7); Sensor installation mechanism (2) includes pressure sensor (13), protective shell (14), sensor fixing piece (15), sealing ring, and the center of sensor fixing piece (15) is provided with lead hole A (19);Soil pressure sensor (13) is placed inside protective shell (14), and soil pressure sensor is fixed at the top of protective shell (14) through sensor fixing piece (15), and limiting mechanism is arranged at the top of protective shell (14);The signal line of soil pressure sensor (13) is led out from the lead hole A (19) of sensor fixing piece (15);The connecting place of sensor fixing piece (15) and protective shell (14) is equipped with sealing ring; After mounting hole sealing mechanism (1) is installed, spring (7) is in compression state, when sensor installation mechanism (2) is disassembled, fixed block (3) moves along slide rail (4) under the action of spring (7) counterforce, realizes the sealing of soil pressure sensor installation hole on shield cutter disc (20);After completing the replacement of soil pressure sensor (13) and the assembly of sensor installation mechanism (2), conical top-in block (25) is placed in the center hole (10) of fixed block (3), the top of protective shell (14) of sensor installation mechanism (2) contacts with the plane of conical top-in block (25), and sensor installation mechanism (2) pushes conical top-in block (25), so that sealing block (6) opens, and force sensor installation mechanism (2) is pushed into the soil pressure sensor installation hole of shield cutter disc (20); Mounting hole sealing mechanism (1) is fixed on the back of shield cutter disc (20) panel through bolt, and sensor installation mechanism (2) is fixed on mounting hole sealing mechanism (1) through bolt;After completing the replacement of soil pressure sensor (13) and the reinstallation of sensor installation mechanism (2), conical top-in block (25) reaches the outside of shield cutter disc (20) panel, and conical top-in block (25) falls into the soil along with the rotation of cutter disc, and the stress surface of soil pressure sensor contacts with the soil body, so that the continuous monitoring of cutter disc soil pressure is realized.

2. The earth pressure sensor mounting device for an automatically closed model shield machine cutterhead according to claim 1, characterized in that, Shield cutterhead (20) is a component of model shield machine, the mounting hole sealing mechanism (1) is fixed in the face plate back of shield cutterhead (20) through mounting hole (12) and bolt, the center hole (10) on fixed block (3) is concentric with earth pressure sensor mounting hole of shield cutterhead (20);Sensor mounting mechanism (2) is fixed in earth pressure sensor mounting hole of shield cutterhead (20) through mounting hole sealing mechanism (1).

3. The earth pressure sensor mounting device for an automatically closed model shield machine cutterhead according to claim 1, characterized in that, Spring limit rod (9) one end is fixed in counter-force beam (8), the other end is in-depth reserved hole in the top of sealing block (6), sealing block (6) moves up and down, spring limit rod (9) can be from the reserved hole of sealing block (6) in and out.

4. The earth pressure sensor mounting device for an automatically closed model shield machine cutterhead according to claim 1, characterized in that, The protruding conical surface of the conical top block (25) is the same as the recessed conical surface of the sealing block (6).

5. The earth pressure sensor mounting device for an automatically closed model shield machine cutterhead according to claim 1, characterized in that, The outer diameter of the protective shell (14), the inner diameter of the fixed block (3) reserved center hole (10) and the diameter of the earth pressure sensor mounting hole of the shield cutterhead (20) are the same.

6. The earth pressure sensor mounting device for an automatically closed model shield machine cutterhead according to claim 2, characterized in that, The outer side of the shield cutterhead (20) is provided with a bearing (21), and a lead hole B (22) is reserved in the middle of the bearing (21);The signal line of the earth pressure sensor (13) is led from the shield cutterhead (20) and the lead hole B (22) to the rear of the cutterhead bearing (21), and then connected with the wireless transmission module (23) after being led out from the lead hole B (22);The shield cutterhead is started by the driving motor (24), the wireless transmission module (23) rotates synchronously with the shield cutterhead (20), so as to avoid the signal line of the earth pressure sensor being twisted off;The wireless transmission module (23) converts the electric signal of the earth pressure sensor (13) into wireless signal and transmits it out, which is received by the external receiving device, so as to realize the earth pressure monitoring of the shield cutterhead (20).

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