A model shield cutter disc soil pressure sensor installation device

Abstract

The application discloses a model shield cutter disc soil pressure sensor mounting device, which comprises a mounting hole sealing mechanism and a sensor mounting mechanism. The mounting hole sealing mechanism is fixed on the back of the cutter disc panel, and the sensor mounting mechanism is embedded into the cutter disc sensor mounting hole through the round hole on the fixing plate and is fixed on the sensor mounting hole sealing mechanism. After installation, the spring of the sensor mounting hole sealing mechanism is in a compressed state. When the sensor mounting mechanism is disassembled and the damaged sensor is replaced, the sealing block moves along the slide rail under the action of the spring tension force, and the cutter disc sensor mounting hole is sealed. After the sensor is replaced, the sensor mounting mechanism is reinstalled. The sensor mounting mechanism pushes the conical top-in block to open the sealing block, and then the sensor mounting mechanism is installed into the cutter disc sensor reserved hole. With the rotation of the cutter disc, the conical top-in block falls into the soil, the soil pressure sensor stress surface is in contact with the soil, and the continuous monitoring of the cutter disc soil pressure is realized.

Description

TECHNICAL FIELD

[0001] The application relates to a device capable of replacing a model shield cutterhead soil pressure sensor and automatically sealing a sensor mounting hole. 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 the stable monitoring of the soil pressure of the shield cutterhead is of great significance to the shield construction. Tunnel excavation simulation tests are an important research method, 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 test 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 monitor the soil pressure of the soil pressure cabin panel. Beijing University of Technology developed a model shield machine capable of monitoring the soil pressure of the cutterhead in 2020, but the soil pressure sensor is fixed on the shield machine cutterhead, and it is difficult to replace it during the test process. During the shield construction process, the soil pressure sensor of the cutterhead continuously rubs against 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 it is necessary to design a soil pressure sensor mounting device that can easily disassemble the soil pressure sensor and automatically seal the mounting hole after disassembly. SUMMARY

[0003] The purpose of the present application is to provide a device that can easily replace the soil pressure sensor of a model shield cutterhead and automatically seal the sensor mounting hole after disassembly, which provides a guarantee for the stable collection of cutterhead soil pressure data during shield construction and the safety of shield excavation tests.

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

[0005] The utility model provides a kind of model shield cutterhead earth pressure sensor installation device, including: sensor installation mechanism 2 and installation hole sealing mechanism 1.Sensor installation mechanism 2 is made of protective shell 14, sensor fixing piece 15, sealing ring.Earth pressure sensor 13 is placed inside protective shell 14, and earth pressure sensor is fixed in protective shell 14 top by sensor fixing piece 15, and the top of protective shell 14 is provided with limiting mechanism, to prevent earth pressure sensor 13 from sliding out of protective shell 14.The signal line of earth pressure sensor 13 is led out from the first lead hole 19 of sensor fixing piece 15.The installation hole sealing mechanism 1 of earth pressure sensor 13 is made of position fixing block 3, sealing block 6, slide rail 4, spring 7, spring fixed end 8 and sealing block limiting block 9.Slide rail 4 is anchored on fixed block 3 by bolt 5.Sealing block 6 is embedded inside slide rail 4 and can slide along slide rail 4.Sealing block 6 is provided with the installation hole of spring 7 on both sides, and the installation hole penetrates both ends of sealing block 6.The inner side of slide rail 4 is provided with sealing block limiting block 9, spring 7 is placed in the installation hole of sealing block 6, and the both ends of spring 7 are connected with spring fixed end 8 and sealing block limiting block 9 respectively.When two sealing blocks 6 move to the outside, spring 7 is stretched and deformed, and after the external force is removed, spring 7 pulls two sealing blocks 6 back to the initial position, and sealing block limiting block 9 is provided with clamping groove on sealing block 6, and when two sealing blocks 6 return to the initial position, sealing block limiting block 9 can be completely embedded inside sealing block 6, to realize the closure of sensor installation hole.

[0006] Installation hole sealing mechanism 1 is fixed on the back of cutterhead 20 panel by bolt, and the reserved hole 10 on fixed block 3 is concentric with earth pressure sensor installation hole of cutterhead 20.Sensor installation mechanism 2 is fixed in sensor installation hole of cutterhead 20 through earth pressure sensor installation hole sealing mechanism 1.Sensor installation mechanism 2 enters sensor installation hole of cutterhead 20 through the reserved hole 10 on fixed block 3 of installation hole sealing mechanism 1, and then is fixed on fixed block 3 by third bolt 18.The signal line of earth pressure sensor 13 is led to the rear of cutterhead bearing 21 from the second lead hole 22 reserved in cutterhead 20 and bearing 21, and is led out from lead-out hole, and then is connected with wireless transmission module 23.After the start of cutterhead drive motor 24, wireless transmission module 23 rotates synchronously with shield cutterhead 20, to avoid the signal line of earth pressure sensor being twisted off.Wireless transmission module 23 converts the electric signal of earth pressure sensor 13 into wireless signal and emits, and is received by external receiving device, to realize the monitoring of earth pressure of cutterhead 20.

[0007] After the replacement of the sensor 13 is completed and the sensor installation mechanism 2 is assembled, the conical top block 12 is placed in the reserved hole 10 of the fixed block 3, and the conical surface of the protrusion of the conical top block 12 is the same as the conical surface of the recess of the sealing block 6. Then, the top end of the protective shell 14 of the sensor installation mechanism 2 is brought into contact with the flat surface of the top block, the conical top block 14 is pushed by the sensor installation mechanism 2, the sealing block 6 is opened, the soil pressure sensor installation mechanism 2 is pushed into the sensor installation hole of the cutter head 20, and the sensor installation mechanism 2 is fixed on the fixed block 3 of the installation hole sealing mechanism 1 through the third bolt 18. After the installation is completed, the conical top block 12 reaches the outside of the panel of the cutter head 20, and the friction of the soil body when the cutter head 20 rotates causes the conical top block 12 to fall into the soil, so that the stress surface of the soil pressure sensor 13 starts to contact the soil body, and the continuous monitoring of the soil pressure is realized.

[0008] Before the model shield machine is constructed, the sensor installation hole sealing mechanism is fixed on the back of the cutter head panel through bolts, and the circular hole on the fixed block is concentric with the cutter head sensor installation hole. The sensor installation mechanism is connected with the installation hole sealing mechanism through bolts and is fixed in the sensor installation hole of the cutter head. After the installation is completed, the spring of the installation hole sealing mechanism is in a compressed state, and after the cutter head soil pressure sensor is damaged during shield construction, the sensor installation mechanism can be disassembled, and under the action of the reaction force of the spring of the installation hole sealing mechanism, the sealing block moves along the slide rail to realize the sealing of the cutter head sensor installation hole. After the replacement of the soil pressure sensor is completed and the sensor installation mechanism is assembled, the conical top block is placed at the front end of the sensor installation mechanism, the conical top block is pushed forward by the sensor installation mechanism, the sealing block is opened, the sensor installation mechanism is installed into the cutter head sensor installation hole, and then the sensor installation mechanism is fixed on the cutter head through the installation hole sealing mechanism. With the rotation of the cutter head, the conical top block falls into the soil, the stress surface of the soil pressure sensor contacts the soil body, and the continuous monitoring of the cutter head soil pressure is realized.

[0009] 1、The model shield cutter head soil pressure sensor installation device can conveniently realize the replacement of the damaged soil pressure sensor of the shield cutter head.

[0010] 2、The model shield cutter head soil pressure sensor installation device can automatically realize the sealing of the cutter head soil pressure sensor installation hole during the replacement of the damaged soil pressure sensor, and prevent underground water from flowing into the shield.

[0011] 3、After the replacement of the soil pressure sensor is completed, the sensor installation mechanism can be conveniently installed on the shield cutter head, and the stress surface of the soil pressure sensor can be protected during the installation process, so that the soil pressure sensor is prevented from being damaged due to excessive installation thrust. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1It is the model shield cutterhead earth pressure sensor installation device overall view of the present application.

[0013] Figure 2 It is the sensor installation hole sealing mechanism overall view of the present application.

[0014] Figure 3 It is the earth pressure sensor installation mechanism overall view of the present application.

[0015] Figure 4 It is the earth pressure sensor installation mechanism side view of the present application.

[0016] Figure 5 It is the earth pressure sensor installation mechanism assembly explosion view of the present application.

[0017] Figure 6 It is the model shield cutterhead earth pressure sensor installation device installation view of the present application.

[0018] Figure 7 It is the model shield cutterhead earth pressure sensor installation device position view of the present application.

[0019] Figure 8 It is the shield machine cutterhead earth pressure sensor arrangement view of the present application.

[0020] Figure 9 It is the model shield machine excavation system overall view of the present application.

[0021] Figure 10 It is the sensor installation mechanism into the installation hole sealing mechanism process view of the present application. DETAILED DESCRIPTION

[0022] The present application is further specifically described below in conjunction with the drawings:

[0023] As shown in Figures 1-10 The model shield cutterhead earth pressure sensor installation device of the present application comprises: a sensor installation mechanism 2 and an installation hole sealing mechanism 1.

[0024] The sensor installation mechanism 2 is composed of a protective shell 14, a sensor fixing part 15 and a sealing ring. The earth pressure sensor 13 is put into the protective shell 15, and the earth pressure sensor is fixed at the top of the protective shell 17 through the sensor fixing part 15. The top of the protective shell 17 is provided with a limiting mechanism to prevent the earth pressure sensor 16 from sliding out of the protective shell 15. The signal line of the earth pressure sensor 13 is led out from the first lead hole 19 of the sensor fixing part 15.

[0025] The sensor mounting hole sealing mechanism 1 is composed of a position fixing block 3, a sealing block 6, a sliding rail 4, a spring 7, a spring fixing end 8, and a sealing block limiting block 9. The side of the fixing block 3 is provided with a bolt hole, and the sliding rail 4 is anchored on the bolt hole of the side of the fixing block 3 through a first bolt 5. The sealing block 6 is embedded in the inside of the sliding rail 4 and can slide along the sliding rail 4. The spring 7 mounting hole is arranged on both sides of the sealing block 6, and the mounting hole penetrates both ends of the sealing block 6. The inside of the sliding rail 4 is provided with a sealing block limiting block 9, and the spring 7 is placed in the sealing block 6 mounting hole, and the two sections of the spring 7 are connected with the spring fixing end 8 and the sealing block limiting block 9 respectively. When the two sealing blocks 6 move outward, the spring 7 is stretched and deformed, and after the external force is removed, the spring 7 pulls the two sealing blocks 6 back to the initial position. The sealing block limiting block 9 is arranged on the sealing block 6, and when the two sealing blocks 6 return to the initial position, the sealing block limiting block 9 can be completely embedded in the inside of the sealing block 6, so that the sealing of the sensor mounting hole is realized. The mounting hole sealing mechanism 1 is fixed on the back of the face plate of the cutter head 20 through a second bolt 11, and the round hole on the fixing block 3 is concentric with the earth pressure sensor mounting hole of the cutter head 20. The cutter head 20 is a component part of a model shield tunneling machine.

[0026] The sensor mounting mechanism 2 is composed of a protective shell 14, a sensor fixing part 15, a first sealing ring 16, and a second sealing ring 17. The earth pressure sensor 13 is placed in the inside of the protective shell 14, and the earth pressure sensor is fixed at the top end of the protective shell 14 through 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 front end of the protective shell 14. The signal line of the earth pressure sensor 13 is led out from the second lead hole 19 of the sensor fixing part 15. The connection part of the sensor fixing part 15 and the protective shell 14 is provided with the first sealing ring 16 and the second sealing ring 17.

[0027] The mounting hole sealing mechanism 2 is fixed on the back of the face plate of the cutter head 20 through a bolt, and the reserved hole 10 on the fixing block 3 is concentric with the earth pressure sensor mounting hole of the cutter head 20. The sensor mounting mechanism 2 is fixed in the sensor mounting hole of the cutter head 20 through the earth pressure sensor mounting hole sealing mechanism 1.

[0028] The signal line of the earth pressure sensor 13 is led to the rear part of the cutter head bearing 21 from the second lead hole 22 reserved in the cutter head 20 and the bearing 21, and then led out from the lead-out hole, 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, so that the signal line of the earth pressure sensor is not twisted and broken. 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, so that the earth pressure of the cutter head 20 is monitored.

[0029] After the sensor 13 replacement is completed and the sensor installation mechanism 2 is assembled, the conical top block 12 is placed in the reserved hole 10 of the fixed block 3, and the protruding conical surface of the conical top block 12 is the same as the recessed conical surface of the sealing block 6. Then, the top end of the protective shell 14 of the sensor installation mechanism 2 is in contact with the flat surface of the top block, the conical top block 14 is pushed by the sensor installation mechanism 2, the sealing block 6 is opened, the soil pressure sensor installation mechanism 2 is pushed into the sensor installation hole of the cutter head 20, and the sensor installation mechanism 2 is fixed on the fixed block 3 of the installation hole sealing mechanism 1 through the third bolt 18. After the installation is completed, the conical top block 12 reaches the outside of the panel of the cutter head 20, and the friction of the soil body when the cutter head 20 rotates makes the conical top block 12 fall into the soil, the force surface of the soil pressure sensor 13 starts to contact the soil body, and the continuous monitoring of the soil pressure is realized.

Claims

1. A device for installing an earth pressure sensor on a model shield tunnel cutterhead, characterized in that, include: Sensor mounting mechanism (2) and mounting hole sealing mechanism (1); After the sensor mounting mechanism (2) is assembled, it is fixed to the mounting hole sealing mechanism (1) by the third bolt (18); The mounting hole sealing mechanism (1) is fixed to the back of the panel of the shield cutterhead (20) by the second bolt (11), and the round hole on the fixing block (3) is concentric with the earth pressure sensor mounting hole of the cutterhead (20); The shield cutterhead (20) is a component of the model shield machine; The sensor mounting hole sealing mechanism (1) includes a position fixing block (3), a sealing block (6), a slide rail (4), a spring (7), a spring fixing end (8), and a sealing block limiting block (9); the slide rail (4) is anchored to the fixing block (3) by a first bolt (5); the sealing block (6) is embedded in the slide rail (4) and can slide along the slide rail (4); the sealing block (6) has spring (7) mounting holes on both sides, and the mounting holes pass through both ends of the sealing block (6); the inner side of the slide rail (4) is provided with a sealing block limiting block (9), the spring (7) is placed in the mounting hole of the sealing block (6), and the two ends of the spring (7) are respectively connected to the spring fixing end (8) and the sealing block limiting block (9); The sensor mounting mechanism (2) and the mounting hole sealing mechanism (1) are fixed in the sensor mounting hole of the shield cutterhead (20); the spring (7) is in a stretched state. When the sensor mounting mechanism (2) is disassembled, the sealing block (6) moves along the slide rail (4) under the action of the spring (7) tension, thereby closing the earth pressure sensor mounting hole of the shield cutterhead (20); after the earth pressure sensor (13) is replaced and the sensor mounting mechanism (2) is assembled, the conical push block (12) is placed into the reserved hole (10) of the fixing block (3), and then the top of the protective shell (14) of the force sensor mounting mechanism (2) contacts the plane of the conical push block (12). The conical push block (14) is pushed by the sensor mounting mechanism (2) so that the sealing block (6) is opened and the sensor mounting mechanism (2) is pushed into the sensor mounting hole of the shield cutterhead (20); The sensor mounting mechanism (2) consists of a protective shell (14), a sensor fixing component (15), and a sealing ring. 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 component (15). A limiting mechanism is provided at the top of the protective shell (14) to prevent the soil pressure sensor (13) from sliding out from the front end of the protective shell (14). The signal line of the soil pressure sensor (13) is led out from the first lead hole (19) of the sensor fixing component (15). A sealing ring is provided at the connection between the sensor fixing component (15) and the protective shell (14). The outer diameter of the protective shell (14), the inner diameter of the reserved hole (10), and the diameter of the sensor mounting hole of the cutter head (20) are the same.

2. The earth pressure sensor installation device for a model shield cutterhead as described in claim 1, characterized in that, When the two sealing blocks (6) move outward, the spring (7) is stretched and deformed. After the external force is removed, the spring (7) pulls the two sealing blocks (6) back to the initial position. The sealing block (6) is provided with a sealing block limiting block (9) slot. When the two sealing blocks (6) return to the initial position, the sealing block limiting block (9) is completely embedded in the sealing block (6), thereby closing the sensor mounting hole.

3. The earth pressure sensor installation device for a model shield cutterhead as described in claim 1, characterized in that, The mounting hole sealing mechanism (1) is fixed to the back of the shield cutterhead (20) panel by bolts, and the sensor mounting mechanism (2) is fixed to the mounting hole sealing mechanism (1) by bolts.

4. The earth pressure sensor installation device for a model shield cutterhead as described in claim 1, characterized in that, After the earth pressure sensor (13) is replaced and the sensor installation mechanism (2) is reinstalled, the conical top block (12) reaches the outside of the shield cutterhead (20) panel. As the shield cutterhead rotates, the conical top block (12) falls into the soil, and the earth pressure sensor's force-bearing surface comes into contact with the soil, thus enabling the continued monitoring of the earth pressure on the shield cutterhead.

5. The earth pressure sensor installation device for a model shield cutterhead as described in claim 1, characterized in that, The conical surface of the conical top block (12) is the same as the concave surface of the sealing block (6).

6. The earth pressure sensor installation device for a model shield tunnel cutterhead as described in claim 1, characterized in that, The earth pressure sensor (13) signal line is led from the second lead hole (22) reserved in the shield cutterhead (20) and the cutterhead bearing (21) to the rear of the cutterhead bearing (21), and then led out from the outlet hole and connected to the wireless transmission module (23); after the shield cutterhead drive motor (24) is started, the wireless transmission module (23) rotates synchronously with the shield cutterhead (20) to avoid the earth pressure sensor signal line 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 out, which is received by an external receiving device to realize the monitoring of earth pressure on the shield cutterhead (20).

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