Attitude adjustment device for double shield hard rock tunnel boring machine

Abstract

The present invention relates to a posture adjustment device applied to a double-shield hard rock tunnel boring machine, comprising a machine body, characterized in that on the outer side of the tail shield of the machine body, several distance measuring sensors are arranged along the circumferential direction of the tail shield, and several main push cylinders are installed between the support shield and the front shield of the machine body, the cylinder body of each main push cylinder is hinged on the support shield, and the rod body is hinged on the front shield; all the main push cylinders are distributed in a circular shape as a whole, and a spacing is formed between two adjacent main push cylinders; all the main push cylinders are divided into four areas, specifically the upper cylinder area, the lower cylinder area, the left cylinder area and the right cylinder area. The advantages of the present invention are: a speed regulating throttle valve is arranged on the piston rod side of the main push cylinder, and the throttle valves of each group of main push cylinders are adjusted during step change to make the gap between the tail shield and the rock wall normal, thereby achieving the purpose of adjusting the shield body posture. The method is easy to operate, does not affect the excavation efficiency, and the posture adjustment process is relatively direct, accurate and relatively fast.

Description

Technical Field

[0001] The invention relates to a posture adjusting device for a double-shield hard rock tunnel boring machine. Background Art

[0002] During the TBM excavation process, geological conditions or problems with the equipment itself may cause the TBM head to sink, roll, or take an abnormal V-shape or reverse V-shape. The posture here refers to the relative position of the TBM front shield (head) and the support shield. If it is not adjusted in time, it will cause great damage to the equipment. It will also cause quality problems in tunnel forming, such as deviation from the tunnel design axis, difficulty in segment installation, misalignment and collapse, cylinder damage, and shield deformation.

[0003] Normally, the rolling of the TBM shield is mainly adjusted by the TBM's own anti-torque system. The offset of the shield, especially the offset of the support shield and the tail shield, is usually achieved by relying on the operator's experience to control the various groups of cylinders in the auxiliary thrust system. There is little reference information during the adjustment process, and the requirements for the operator are high. The posture adjustment process is relatively slow.

[0004] The main machine of the double-shield hard rock tunnel boring machine (TBM) is relatively long. During normal excavation, due to inertia, the TBM cutterhead will cause the shield to deviate to the right or even roll; when the surrounding rock support is insufficient, the TBM main machine will deviate downward as a whole under its own gravity. If the deviation of the TBM shield is not adjusted in time, it will cause a large deviation of the entire tunnel axis, and even cause problems such as tunnel forming quality, difficulty in segment installation, misalignment and collapse, cylinder damage, and shield deformation.

[0005] Normally, the rolling of the TBM shield is mainly adjusted by the TBM's own anti-torque system. The shield offset adjustment is usually achieved by controlling the auxiliary thrust system cylinders through feedback information from the guidance system (shield pitch angle, auxiliary thrust cylinder stroke difference, shield tail segment gap, etc.) during the step-changing process, relying on the operator's experience. This places high demands on the operator. The attitude data comes from the guidance system, which cannot well reflect the relative position relationship between the TBM shield (especially the support shield and tail shield) and the tunnel surrounding rock, and the adjustment process is relatively complicated. Summary of the invention

[0006] In order to overcome the defects of the prior art, the present invention provides a posture adjustment device for a double-shield hard rock tunnel boring machine. The technical solution of the present invention is:

[0007] A posture adjustment device applied to a double-shield hard rock tunnel boring machine comprises a machine body, on the outer side of the tail shield of the machine body, a plurality of distance measuring sensors are arranged along the circumferential direction of the tail shield, a plurality of main thrust cylinders are installed between the support shield and the front shield of the machine body, the cylinder body of each main thrust cylinder is hinged on the support shield, and the rod body is hinged on the front shield; all the main thrust cylinders are distributed in a circular shape as a whole, and a spacing is formed between two adjacent main thrust cylinders; all the main thrust cylinders are divided into four areas, specifically an upper cylinder area, a lower cylinder area, a left cylinder area and a right cylinder area, wherein the main thrust cylinders in the upper cylinder area, the main thrust cylinders in the lower cylinder area, the main thrust cylinders in the left cylinder area and the main thrust cylinders in the right cylinder area are connected to a cylinder control system, a displacement sensor is installed in each of the upper cylinder area, the lower cylinder area, the left cylinder area and the right cylinder area, and all the distance measuring sensors, the displacement sensors and the cylinder control system are connected to a control box.

[0008] The cylinder control system includes a balancing valve, a pressure sensor, a safety valve, a solenoid valve, a speed regulating throttle valve and an R-gear shift cylinder. A balancing valve is installed on the first line between the A port of the solenoid valve and the first control interface of the main push cylinder. The first line is connected to two of the ports of the balancing valve, and a pressure sensor is installed on the first line; the B port of the solenoid valve is connected to the second control interface of the main push cylinder through a second line, and the second line is connected to the other two ports of the balancing valve; a safety valve and a speed regulating throttle valve are installed in sequence on the line between the B port and the T port of the solenoid valve, and the B port of the speed regulating throttle valve is connected to the R-gear shift cylinder; the P port of the solenoid valve is connected to the control box.

[0009] The advantages of the present invention are: a speed regulating throttle valve is arranged on the piston rod side of the main push oil cylinder, and the throttle valves of each group of main push oil cylinders are adjusted during the step change so that the gap between the tail shield and the rock wall is normal, thereby achieving the purpose of adjusting the shield body posture. The method is easy to operate, does not affect the excavation efficiency, and the posture adjustment process is relatively direct, accurate and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0011] Figure 2 yes Figure 1 Schematic diagram of the structure of the oil cylinder control system.

[0012] Figure 3 yes Figure 1 AA section view.

[0013] Figure 4 yes Figure 1 Right view of .

[0014] Among them, 1-cutterhead; 2-front shield; 3-main push cylinder; 4-support shield; 5-tail shield; 6-tunnel surrounding rock; 7-distance measuring sensor; 8-prefabricated segment. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0016] See also Figures 1 to 4 The present invention relates to a posture adjustment device applied to a double-shield hard rock tunnel boring machine, comprising a machine body, on the outer side of the tail shield 5 of the machine body, a plurality of distance measuring sensors 7 are arranged along the circumferential direction of the tail shield 5, a plurality of main thrust cylinders are installed between the support shield and the front shield of the machine body, the cylinder body of each main thrust cylinder 3 is hinged on the support shield 4, and the rod body is hinged on the front shield 2; all the main thrust cylinders 3 are distributed in a circular shape as a whole, and a spacing is formed between two adjacent main thrust cylinders 3; all the main thrust cylinders are divided into four areas, specifically an upper cylinder area, a lower cylinder area, a left cylinder area and a right cylinder area, wherein the main thrust cylinder 3 of the upper cylinder area, the main thrust cylinder 3 of the lower cylinder area, the main thrust cylinder 3 of the left cylinder area and the main thrust cylinder 3 of the right cylinder area are connected to the cylinder control system, and a displacement sensor is installed in the upper cylinder area, the lower cylinder area, the left cylinder area and the right cylinder area, and all the distance measuring sensors 7, the displacement sensors and the cylinder control system are connected to the control box.

[0017] The cylinder control system includes a balancing valve 11, a pressure sensor 15, a safety valve 14, a solenoid valve 10, a speed regulating throttle valve 15 and an R gear shift cylinder. The balancing valve 11 is installed on the first line between the A port of the solenoid valve 10 and the first control interface of the main push cylinder 3, and the first line is connected to two ports of the balancing valve, and the pressure sensor 15 is installed on the first line; the B port of the solenoid valve 10 is connected to the second control interface of the main push cylinder 3 through a second line, and the second line is connected to the other two ports of the balancing valve 11; the safety valve 14 and the speed regulating throttle valve 15 are installed in sequence on the line between the B port and the T port of the solenoid valve 10, and the B port of the speed regulating throttle valve 15 is connected to the R gear shift cylinder; the P port of the solenoid valve 10 is connected to the control box.

[0018] The working principle of the present invention is: taking 10 main thrust cylinders 3 as an example, the working principle of the double-shield TBM posture adjustment is explained, wherein the 10 main thrust cylinders 3 are divided into four groups, there are two main thrust cylinders in the upper cylinder area; there are four main thrust cylinders in the lower cylinder area, and there are two main thrust cylinders in the left cylinder area and the right cylinder area, wherein at least one displacement sensor is installed in each cylinder area.

[0019] If the shield body is offset, assuming that the theoretical horizontal gap between the tail shield 5 and the tunnel surrounding rock 6 is a, the actual value is a+Δa on the left side and a-Δb on the right side, then the shield body is offset to the right. Accordingly, when the TBM changes steps, the main push cylinders of the left and right cylinder areas are adjusted according to the trend of the shield body and the tunnel axis, and the following adjustments can be made:

[0020] The speed regulating throttle valve of the left cylinder area can be adjusted down, and the speed regulating throttle valve of the right cylinder area can be adjusted up. When the propulsion starts, it will be found that the pressure of the main push cylinder of the left cylinder area (or the right cylinder area) gradually increases, and the pressure of the main push cylinder of the upper cylinder area and the lower cylinder area in the vertical direction remains unchanged. It is adjusted in real time according to the gap between the tail shield and the tunnel surrounding rock until the gap values ​​on both sides are close and the guide value of the support shield is close to the axis without exceeding the theoretical value. Similarly, the left offset or up and down offset of the shield body can also make corresponding adjustments to the speed regulating throttle valve of the grouped cylinder to meet the posture adjustment requirements.

Claims

1. A posture adjustment device for a double-shield hard rock tunnel boring machine, comprising a machine body, characterized in that: On the outside of the tail shield of the machine body, several distance measuring sensors are arranged along the circumferential direction of the tail shield, and several main thrust cylinders are installed between the support shield and the front shield of the machine body, the cylinder body of each main thrust cylinder is hinged on the support shield, and the rod body is hinged on the front shield; all the main thrust cylinders are distributed in a circle as a whole, and a distance is formed between two adjacent main thrust cylinders; all the main thrust cylinders are divided into four areas, specifically an upper cylinder area, a lower cylinder area, a left cylinder area and a right cylinder area, wherein the main thrust cylinder of the upper cylinder area, the main thrust cylinder of the lower cylinder area, the main thrust cylinder of the left cylinder area and the main thrust cylinder of the right cylinder area are connected to the cylinder control system, and a displacement sensor is installed in the upper cylinder area, the lower cylinder area, the left cylinder area and the right cylinder area, and all the distance measuring sensors, displacement sensors and cylinder control systems are connected to the control box; The cylinder control system includes a balancing valve, a pressure sensor, a safety valve, a solenoid valve, a speed regulating throttle valve and an R-gear shift cylinder. A balancing valve is installed on the first line between the A port of the solenoid valve and the first control interface of the main push cylinder. The first line is connected to two of the ports of the balancing valve, and a pressure sensor is installed on the first line; the B port of the solenoid valve is connected to the second control interface of the main push cylinder through a second line, and the second line is connected to the other two ports of the balancing valve; a safety valve and a speed regulating throttle valve are installed in sequence on the line between the B port and the T port of the solenoid valve, and the B port of the speed regulating throttle valve is connected to the R-gear shift cylinder; the P port of the solenoid valve is connected to the control box.

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