Shield tunneling machine soil pressure sensor detection device

Abstract

The utility model relates to a shield tunneling machine soil pressure sensor detection device which comprises an outer cylinder with one closed end and an inner cylinder located in the outer cylinder, an adsorption cavity is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder, a detection cavity is formed in the inner cylinder, the adsorption cavity and the detection cavity are provided with openings facing the same side, an adsorption opening corresponds to the adsorption cavity, and a detection opening corresponds to the detection cavity. The detection cavity and the adsorption cavity are mutually independent; an air tap is arranged on the adsorption cavity and connected with a negative pressure pump through an air pipe, and an air tap is arranged on the detection cavity and connected with a positive pressure pump through an air pipe. When the device is used, the soil pressure sensor does not need to be detached or moved, detection is carried out directly according to the working state of the soil pressure sensor, and it is ensured that the soil pressure sensor cannot go wrong due to detection; the detection device is small in size, light in overall weight, convenient to take and labor-saving in detection.

Description

Technical Field

[0001] The utility model belongs to the field of shield machine detection, in particular to a detection device for the earth pressure sensor of a shield machine. Background Technique

[0002] A shield machine is a special large-scale engineering equipment used for underground tunnel excavation construction, with functions such as excavating and cutting soil bodies, transporting soil residues, assembling tunnel linings, and measuring and guiding deviation correction. The earth pressure balance shield machine realizes the stability of the excavation face through the earth pressure balance system, uses the excavated soil to support the excavation face, controls the pressure in the soil bin by adjusting the shield propulsion speed and the rotation speed of the screw conveyor, so that the soil pressure in the soil bin is balanced with the underground water and soil pressure, and prevents the excavation face from collapsing or the ground surface from subsiding. At this time, an earth pressure sensor is required. The earth pressure sensor of the shield machine is mainly used to detect the soil bin pressure. The shield machine operator takes corresponding measures to adjust the soil bin pressure according to the data fed back by the earth pressure sensor until it reaches the set range, so as to achieve the earth pressure balance and effectively control the ground surface settlement.

[0003] Before the shield equipment enters the site, it is necessary to confirm the accuracy of each pressure sensor. The currently commonly used method is to remove the earth pressure sensor from the shield head and then send it to the manufacturer of the sensor for detection and calibration. However, the disassembly and installation of the earth pressure sensor are both troublesome, and the existing detection is time-consuming and laborious. Moreover, the earth pressure sensor is prone to changes in accuracy when it is collided, which is difficult to avoid during the disassembly and installation process. Even if the manufacturer has completed the detection and calibration, it is still unknown whether the accuracy is guaranteed after installation. Therefore, a device that can detect without disassembling and installing the earth pressure sensor is needed to realize the on-line detection of the earth pressure sensor. Summary of the Invention

[0004] The utility model provides a detection device for the earth pressure sensor of a shield machine, which adopts an adsorption-type fixed structure, uses positive pressure to simulate the soil pressure applied to the earth pressure sensor, and compares the pressure data obtained from the earth pressure sensor with the actually applied pressure data, so as to determine whether the earth pressure sensor meets the requirements.

[0005] The specific technical solution of the utility model is as follows: A detection device for the earth pressure sensor of a shield machine includes an outer cylinder with one end closed and an inner cylinder located inside the outer cylinder. An adsorption cavity is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder. The inside of the inner cylinder is a detection cavity. The adsorption cavity and the detection cavity have openings facing the same side, the adsorption port corresponding to the adsorption cavity, and the detection port corresponding to the detection cavity. The detection cavity and the adsorption cavity are independent of each other; a nozzle is arranged on the adsorption cavity, and the nozzle is connected to a negative pressure pump through a trachea. A nozzle is arranged on the detection cavity, and the nozzle is connected to a positive pressure pump through a trachea.

[0006] Both the outer cylinder and the inner cylinder are structured with one end closed and one end open. The adsorption chamber is connected to a negative pressure pump through a nozzle, thereby establishing a negative pressure within the adsorption chamber. Once the open end of the outer cylinder closely adheres to the surface of the shield head, leveraging the characteristics of negative pressure, the outer cylinder is firmly fixed to the surface of the shield head. Once the outer cylinder is fixed to the surface of the shield head, the end of the inner cylinder also closely adheres to the surface of the shield head, and the opening of the inner cylinder precisely covers the position of the earth pressure sensor installation hole on the shield head. The detection chamber is connected to a positive pressure pump through a nozzle, thereby establishing a positive pressure within the detection chamber. The positive pressure in the detection chamber precisely simulates the earth pressure environment borne by the earth pressure sensor. Through the detection circuit connected to the earth pressure sensor, the measurement data of the earth pressure sensor can be obtained. By comparing this data with the positive pressure data of the detection chamber, it can be determined whether the accuracy of the earth pressure sensor meets the requirements; during use, the pressure value in the adsorption chamber should be greater than the pressure value in the detection chamber, so as to ensure that the outer cylinder always fits and is fixed to the outer surface of the shield head and normally simulates the earth pressure environment; the detection chamber and the adsorption chamber are independent of each other, so that the positive pressure and the negative pressure do not interfere with each other and each plays its role; the detection circuit can adopt the circuit connected when the earth pressure sensor is in use. This circuit can transmit the data of the earth pressure sensor to the operation cabin of the shield machine, and the real-time data of the earth pressure sensor can be known in the operation cabin. It is also possible to prepare another circuit connected to the earth pressure sensor with reference to the circuit in use, such as a data cable and a display; when this device is in use, there is no need to remove the earth pressure sensor and no need to move the earth pressure sensor. The detection is directly carried out with reference to the state when the earth pressure sensor is working, ensuring that the earth pressure sensor will not have problems due to detection; this detection device is small in size, relatively light in overall weight, convenient to pick up, and labor-saving in detection.

[0007] Preferably, the inner cylinder and the outer cylinder are of an integral structure. The inner cylinder is cylindrical, and the outer cylinder is cylindrical. The two cylinders are coaxially arranged, and the distance between the inner wall of the outer cylinder and the outer wall of the inner cylinder is equal. The integral structure of the inner cylinder and the outer cylinder can be integrally formed. This detection device can be directly integrally injection-molded with high-strength plastic or made of metal that meets the strength requirements; the inner cylinder and the outer cylinder are coaxially arranged, and the radial dimensions of the adsorption chamber outside the inner cylinder are equal, and the adsorption force is relatively balanced; at the same time, the position of the detection chamber can be determined according to the outer diameter of the outer cylinder to ensure accurate detection positioning.

[0008] Preferably, connection columns are arranged between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the connection columns are arranged radially. Through the radially arranged connection columns, the strength and positional accuracy between the inner cylinder and the outer cylinder are improved.

[0009] Preferably, one end of the inner cylinder is closed, and the closed end of the inner cylinder coincides with the closed end of the outer cylinder, and the closed end is hemispherical in shape. The closed end being hemispherical in shape can increase the area of the closed end.

[0010] Preferably, the nozzle on the detection chamber is arranged at the center position of the closed end and is coaxially arranged with the inner cylinder.

[0011] Preferably, the nozzle on the adsorption chamber is arranged at an eccentric position of the closed end, and the nozzle is radially arranged relative to the closed end.

[0012] The nozzles on the detection chamber and the adsorption chamber adopt a quick-insert structure for convenient connection, and the flanging is connected to the trachea.

[0013] Preferably, a pressure gauge is connected to the outer cylinder, and the detection part of the pressure gauge is located in the adsorption chamber. The pressure in the adsorption chamber can be obtained through the pressure gauge, so as to determine whether the adsorption force of the negative pressure meets the requirements and avoid air leakage in the adsorption chamber.

[0014] Preferably, a one-way safety valve is connected to the detection chamber. The one-way safety valve plays a role in protecting the detection chamber. The working pressure of the one-way safety valve is at the upper limit value of the working pressure of the earth pressure sensor. Once the provided positive pressure exceeds this safety value, the detection chamber will be relieved of pressure, thus ensuring work safety.

[0015] Preferably, the end of the outer cylinder corresponding to the adsorption port and the end of the inner cylinder corresponding to the detection port are flush. An outer sealing component is arranged on the end of the outer cylinder corresponding to the adsorption port, and an inner sealing component is arranged on the end of the inner cylinder corresponding to the detection port. The outer sealing component is arranged at the end of the outer cylinder, and the inner sealing component is arranged at the end of the inner cylinder. After the detection device is fixedly attached to the surface of the shield head, the sealing of the adsorption chamber and the detection chamber is ensured.

[0016] Preferably, the cross-section of the outer sealing component is in a groove shape, and the outer sealing component is buckled on the end of the outer cylinder; a clamping groove is arranged on the inner sealing component, and the clamping groove is buckled with the end of the inner cylinder. A ring flap is arranged on the radial inner side of the clamping groove of the inner sealing component, and an inner hole is arranged at the central part of the ring flap. The aperture of the inner hole is smaller than the inner diameter of the inner cylinder and larger than the aperture of the installation hole of the earth pressure sensor on the shield head. The ring flap enables the positive pressure in the detection chamber to act on the inner side of the ring flap, pressing the inner sealing component against the surface of the shield head, thereby improving the sealing effect of the inner sealing component.

[0017] The beneficial effects of the present utility model are as follows: When the device is in use, it is not necessary to remove the earth pressure sensor, nor to move the earth pressure sensor. The detection can be directly carried out with reference to the state when the earth pressure sensor is working, ensuring that the earth pressure sensor will not have problems due to detection; the detection device is small in size, relatively light in overall weight, convenient to pick up, and labor-saving in detection. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a sectional view of the present utility model;

[0020] Figure 3 is a schematic diagram of the position of the earth pressure sensor on the surface of the shield head of the present utility model;

[0021] Figure 4 is a schematic diagram of the use of the utility model;

[0022] In the figure: 1. Outer cylinder, 2. Detection chamber air nozzle, 3. Adsorption chamber air nozzle, 4. Pressure gauge, 5. Outer sealing member, 6. Adsorption chamber, 7. Inner cylinder, 8. Inner sealing member, 9. Detection chamber, 10. Connecting column, 11. Ring flap, 12. Inner hole, 13. One-way safety valve, 14. Closed end, 15. Shield head, 16. Earth pressure sensor, 17. Air pipe, 18. Control valve, 19. Positive pressure pump, 20. Negative pressure pump. Specific embodiments

[0023] The following will further describe the present utility model through specific embodiments in conjunction with the drawings. Embodiment

[0024] As Figure 1 Figure 2 shown, an earth pressure sensor detection device for a shield machine includes an outer cylinder 1 and an inner cylinder 7. The outer cylinder is cylindrical, one end of the outer cylinder is closed to form a hemispherical closed end 14, the inner cylinder is cylindrical, one end of the inner cylinder is connected to the closed end to form an integral structure, and the closed end also closes the end of the inner cylinder. The other ends of the inner cylinder and the outer cylinder are open and flush.

[0025] The outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder. The inner cylinder is located inside the outer cylinder, and the inner cylinder and the outer cylinder are coaxially arranged. The distance between the inner wall of the outer cylinder and the outer wall of the inner cylinder is equal. A cylindrical connecting column 10 is provided between the outer wall of the inner cylinder and the inner wall of the outer cylinder. The connecting column is arranged radially. In this embodiment, there are four connecting columns, and the adjacent connecting columns are spaced 90°. The inside of the inner cylinder is a detection chamber 9, one end corresponding to the opening of the detection item is a detection port, and the gap between the outer cylinder and the inner cylinder is an adsorption chamber 6, and one end corresponding to the opening of the adsorption chamber is an adsorption port.

[0026] A detection chamber air nozzle 2 is provided at the central position of the closed end. The detection chamber air nozzle communicates with the detection chamber, and the detection chamber air nozzle adopts a quick-insert structure convenient for connecting with the air pipe 17. An adsorption chamber air nozzle 3 is provided at the eccentric part of the closed end. The adsorption chamber air nozzle communicates with the adsorption chamber radially, and the adsorption chamber air nozzle adopts a quick-insert structure convenient for connecting with the air pipe. A one-way safety valve 13 is provided on the closed end, and the one-way safety valve communicates with the detection chamber. A pressure gauge 4 is provided on the barrel wall of the outer cylinder, and the detection part of the pressure gauge is located inside the adsorption chamber.

[0027] An outer sealing member 5 is provided at the end of the outer cylinder corresponding to the adsorption port. The cross-section of the outer sealing member is in a groove shape, and the outer sealing member is buckled on the end of the outer cylinder. An inner sealing member 8 is provided at the end of the inner cylinder corresponding to the detection port. A clamping groove is provided on the inner sealing member, and the clamping groove is buckled with the end of the inner cylinder. An annular flap 11 is provided on the inner side in the radial direction of the clamping groove of the inner sealing member. An inner hole 12 is provided at the central part of the annular flap. The aperture of the inner hole is smaller than the inner diameter of the inner cylinder and larger than the aperture of the mounting hole of the earth pressure sensor on the shield head. The end faces of the outer sealing member and the inner sealing member are flush and in the same plane.

[0028] As Figure 3 shown, the shield head 15 of the shield machine is circular. A plurality of mounting holes are provided in the upper part of the circle. An earth pressure sensor 16 is hermetically installed in the mounting hole. The earth pressure sensor is connected with a detection circuit, and the detection circuit includes a data line and a display.

[0029] As Figure 4 shown, the usage method of this detection device: Connect the detection chamber air nozzle of the detection device to the positive pressure pump 19 through the air pipe 17. A control valve 18 and a pressure gauge are provided on the air pipe. The adsorption chamber air nozzle is connected to the negative pressure pump 20 through the air pipe, and a control valve is provided on the air pipe. One open end of the detection device is attached to the surface of the shield head. Before attachment, determine the position of the outer cylinder so that the inner hole is aligned with the detection end of the earth pressure sensor. Then start the negative pressure pump to create a negative pressure in the adsorption chamber and adsorb and fix it on the surface of the shield head. Observe the value of the pressure gauge on the outer cylinder until the pressure in the adsorption chamber meets the adsorption and fixation requirements. Then start the positive pressure pump to create a positive pressure in the detection chamber, form a working environment simulation of the earth pressure sensor in the detection chamber, observe the detection data of the earth pressure sensor through the display on the detection circuit, and compare it with the pressure gauge on the air pipe to judge the accuracy of the earth pressure sensor to determine whether the earth pressure sensor meets the usage requirements.

[0030] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention. Any simple modification, change, and equivalent transformation made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A shield machine soil pressure sensor detection device, characterized in that: The invention comprises an outer cylinder (1) with one end closed and an inner cylinder (7) in the outer cylinder, an adsorption chamber (6) is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder, a detection chamber (9) is in the inner cylinder, the adsorption chamber and the detection chamber have openings facing the same side, the adsorption chamber is the adsorption port, the detection chamber is the detection port, and the detection chamber and the adsorption chamber are independent of each other; an air nozzle is provided on the adsorption chamber, the air nozzle is connected to a negative pressure pump (20) through an air pipe, and an air nozzle is provided on the detection chamber, the air nozzle is connected to a positive pressure pump (19) through an air pipe; and a detection circuit connected to the soil pressure sensor is also included.

2. A shield machine soil pressure sensor detection device according to claim 1, characterized in that: The inner cylinder and the outer cylinder are an integrated structure. The inner cylinder is cylindrical, the outer cylinder is cylindrical, the two cylinders are coaxially arranged, and the distance between the inner wall of the outer cylinder and the outer wall of the inner cylinder is equal.

3. A shield machine soil pressure sensor detection device according to claim 1, characterized in that: A connecting column (10) is provided between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the connecting column is arranged radially.

4. A shield machine soil pressure sensor detection device according to claim 1, 2 or 3, characterized in that: One end of the inner cylinder is closed, the closed end of the inner cylinder coincides with the closed end of the outer cylinder, and the closed end is in a hemispherical shape.

5. A shield machine soil pressure sensor detection device according to claim 4, characterized in that: The air nozzle on the detection cavity is arranged at the center of the closed end and is coaxially arranged with the inner cylinder.

6. A shield machine soil pressure sensor detection device according to claim 4, characterized in that: The air nozzle on the adsorption chamber is arranged at an eccentric position of the closed end, and the air nozzle is arranged radially relative to the closed end.

7. The shield machine soil pressure sensor detection device according to claim 1, characterized in that: The outer cylinder is connected to a pressure gauge (4), and a detection portion of the pressure gauge is located in the adsorption chamber.

8. The shield machine soil pressure sensor detection device according to claim 1, characterized in that: The detection chamber is connected to a one-way safety valve (13).

9. The shield machine soil pressure sensor detection device according to claim 1, characterized in that: The end of the outer tube corresponding to the adsorption port is flush with the end of the inner tube corresponding to the detection port. An outer sealing component (5) is provided on the end of the outer tube corresponding to the adsorption port, and an inner sealing component (8) is provided on the end of the inner tube corresponding to the detection port.

10. A shield machine soil pressure sensor detection device according to claim 9, characterized in that: The cross section of the outer sealing component is groove-shaped, and the outer sealing component is buckled on the end of the outer tube; the inner sealing component is provided with a slot, which is buckled with the end of the inner tube, and the inner sealing component is provided with a ring petal (11) on the radial inner side of the slot, and an inner hole (12) is provided at the center of the ring petal, and the aperture of the inner hole is smaller than the inner diameter of the inner tube and larger than the aperture of the mounting hole of the earth pressure sensor on the shield head.

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