An intelligent deviation correction method for shield pushing in tunnel bridge

Abstract

The present invention discloses an intelligent deviation correction method for tunnel bridge shield pushing, comprising the following steps: (1) setting a laser transmitter behind the tunnel bridge shield and setting a photosensitive displacement array in front of the tunnel bridge shield; (2) debugging the positions of the photosensitive displacement array and the laser transmitter so that the laser beam emitted by the laser transmitter is directly facing the center of the photosensitive displacement array in the correct posture; (3) using the photosensitive displacement array to monitor the offset of the laser beam emitted by the laser transmitter, and adjusting the thrust of the jack according to the offset, so that the tunnel bridge shield is pushed forward in the correct direction. Compared with the prior art, the monitoring device of the present invention is simple and easy to install; the deviation correction is automatically realized during the pushing forward process, and no manual control is required; the deviation correction method is simple, fast, efficient and low-cost.

Description

Technical Field

[0001] The invention relates to the technical field of shield pushing, and in particular to an intelligent deviation correction method for shield pushing of a tunnel bridge. Background Art

[0002] There are two main schemes for separated grade separation projects: an overpass and an underpass. The overpass is preferred in the cutting section, while the underpass is more advantageous in the embankment section. As a minimally invasive construction method, the shield pushing of the tunnel bridge has the remarkable characteristics of safety, traffic guarantee, economy, and environmental protection. It is a new technology for the construction of frame bridges and has been widely used in the road and railway industries. With the extensive application of the shield pushing construction technology for tunnel bridges, engineering and technical personnel have found that tunnel bridges are prone to "head-locking" and misalignment problems during the pushing process, and the problem is particularly prominent when the pushing direction is oblique to the intersecting road. There are few solutions in the prior art that can solve this problem. In view of this, the inventor of this application has obtained an intelligent deviation correction method for the shield pushing of tunnel bridges after in-depth research. Summary of the invention

[0003] The purpose of the present invention is to provide an intelligent deviation correction method for shield pushing of a tunnel bridge, which can correct the deviation phenomenon during the pushing process.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A tunnel bridge shield push-up intelligent deviation correction method includes the following steps: (1) a laser transmitter is arranged behind the tunnel bridge shield, and a photosensitive displacement array is arranged in front of the tunnel bridge shield; (2) the positions of the photosensitive displacement array and the laser transmitter are adjusted so that the laser beam emitted by the laser transmitter is directly facing the center of the photosensitive displacement array in the correct posture; (3) the offset of the laser beam emitted by the laser transmitter is monitored by the photosensitive displacement array, and the thrust of the jack is adjusted according to the offset so that the tunnel bridge shield is pushed in the correct direction. In a preferred embodiment, in the step (3), the process of adjusting the thrust of the jack includes: when it is monitored that the laser beam of the laser emitted by the laser transmitter is offset to the left, the thrust of the jack providing the right turning torque is reduced to achieve the required compensation bending moment to achieve deviation correction; when it is monitored that the laser beam of the laser emitted by the laser transmitter is offset to the right, the thrust of the jack providing the left turning torque is reduced to achieve the required compensation bending moment to achieve deviation correction. In a preferred embodiment, step (3) is controlled by a PLC controller. In a preferred embodiment, the light-sensitive displacement array includes a central receiver and a plurality of side receivers, the central receiver and the plurality of side receivers are arranged in a horizontal straight line, and the central receiver is located at the center of the arrangement straight line. In a preferred embodiment, the side receivers reciprocate toward and away from the central receiver, and the closer to the central receiver, the slower the movement speed of the side receivers. In a preferred embodiment, the movement paths of the plurality of side receivers form a straight line having a breakpoint located at the central receiver, and the movement paths of the plurality of side receivers do not overlap. In a preferred embodiment, the light-sensing displacement array further comprises a mounting seat, a first abutting block, a second abutting block, a first abutting spring, a second abutting spring, a first movable rod, a second movable rod, a abutting wheel and a driving motor. The mounting seat is provided with a first elongated hole and a second elongated hole. A plurality of the side receivers located on one side of the central receiver are connected to the first movable rod after passing through the first elongated hole, and a plurality of the side receivers located on the other side of the central receiver are connected to the second movable rod after passing through the second elongated hole. The first abutting block and the second abutting block are fixed to the mounting seat. One end of the first abutting spring is connected to the first abutting block, and the other end is connected to an end of the first movable rod away from the second movable rod. One end of the second abutting spring is connected to the second abutting block, and the other end is connected to an end of the second movable rod away from the first movable rod. The adjacent ends of the first movable rod and the second movable rod abut on the circumference of the abutting wheel. The circumference of the abutting wheel is provided with symmetrically distributed first arc-shaped protrusions and second arc-shaped protrusions. The driving motor is connected to the abutting wheel for driving the abutting wheel to rotate.In a preferred embodiment, the curvature of the first arc-shaped protrusion and the second arc-shaped protrusion is greater than the curvature of the abutting wheel. In a preferred embodiment, a mounting plate is provided on the mounting seat, and a mounting through hole is provided on the mounting plate. In a preferred embodiment, a guard frame surrounding the central receiver and the plurality of side receivers is provided on the mounting seat, and an inner cavity is provided in the side wall of the guard frame, and an air injection hole connected to the inner cavity is provided on the inner wall of the guard frame, and an air supply pipe connected to the inner cavity is provided on the outer wall of the guard frame.

[0006] Compared with the prior art, the present invention provides an intelligent deviation correction method for tunnel bridge shield pushing, the monitoring device is simple and easy to install, and the deviation correction is automatically realized during the pushing process, without manual control, and the deviation correction method is simple, fast, efficient and low-cost. Specifically, the tunnel bridge posture monitoring is mainly carried out by setting a laser transmitter at a fixed position in the field behind the tunnel bridge shield, and setting a laser receiver in front of the tunnel bridge shield, that is, a light-sensitive displacement array. First, the positions of the transmitter and the receiver are debugged to ensure that when the tunnel bridge posture is normal, the emitted laser beam will pass through the center position of the receiver. If the tunnel bridge shield is offset due to torque imbalance during the pushing process, the position of the receiver receiving the laser beam will change, and the change direction and amount will be transmitted to the intelligent control system through real-time monitoring, and the force applied to the left or right jack behind the pushing is adjusted to make the pushing return to the original direction as much as possible, reduce the "head deviation" and "snaking" effects during the pushing process, and ensure the smooth progress of the pushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The present invention relates to a plan layout diagram of various equipment in an application of an intelligent deviation correction method for shield pushing of a tunnel bridge.

[0008] Figure 2 The invention relates to a control system principle schematic diagram of an intelligent deviation correction method for shield pushing of a tunnel bridge.

[0009] Figure 3 The invention relates to a control program schematic diagram of an intelligent deviation correction method for shield pushing of a tunnel bridge.

[0010] Figure 4 The invention relates to a schematic diagram of a tunnel bridge's jacking state in the application of an intelligent deviation correction method for jacking a tunnel bridge shield.

[0011] Figure 5 The invention relates to a plane mechanical analysis model of a tunnel bridge in the application of an intelligent deviation correction method for shield pushing of a tunnel bridge.

[0012] Figure 6 It is a structural schematic diagram (first perspective) of a light-sensitive displacement array used in an intelligent deviation correction method for shield pushing of a tunnel bridge according to the present invention.

[0013] Figure 7 It is a structural schematic diagram (second perspective) of a light-sensitive displacement array used in an intelligent deviation correction method for shield pushing of a tunnel bridge according to the present invention.

[0014] In the figure

[0015] Mounting seat 1; first elongated hole 2; second elongated hole 3; mounting plate 4; mounting through hole 5; protective frame 6; air pipe 7; first abutment block 8; second abutment block 9; first abutment spring 10; second abutment spring 11; first movable rod 12; second movable rod 13; abutment wheel 14; first arc-shaped protrusion 15; second arc-shaped protrusion 16; driving motor 17; central receiver 18; side receiver 19. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0017] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0018] A method for intelligent deviation correction of tunnel bridge shield thrusting comprises the following steps: (1) arranging a laser transmitter behind the tunnel bridge shield and arranging a photosensitive displacement array in front of the tunnel bridge shield; (2) debugging the positions of the photosensitive displacement array and the laser transmitter so that, in a correct posture, the laser beam emitted by the laser transmitter is directly aligned with the center of the photosensitive displacement array; (3) using the photosensitive displacement array to monitor the offset of the laser beam emitted by the laser transmitter, and adjusting the thrust of the jack according to the offset, so that the tunnel bridge shield is thrusted in the correct direction.

[0019] The tunnel bridge push-up posture is divided into plane posture and vertical posture. Generally, when the bearing capacity of the foundation is good, the vertical posture is well controlled, which will not be discussed here. However, the tunnel bridge push-up is affected by the large angle oblique intersection, and the soil pressure on the left and right sides is not on the same line of action, which will form an unbalanced moment, causing the push-up rotation, so that the push-up is not carried out in the predetermined direction. The existence of unbalanced moment will cause the plane deflection of the tunnel bridge, resulting in the adjustment of soil pressure at different positions and eventually reaching a new equilibrium state.

[0020] The intelligent deviation correction method for shield tunneling in this embodiment is simple in monitoring device and easy to install. It can automatically correct the deviation during the forward pushing process without manual control. The deviation correction method is simple, fast, efficient and low in cost. Figure 1 and Figure 2As shown, the tunnel bridge posture monitoring is mainly carried out by setting a laser transmitter at a fixed position in the site behind the tunnel bridge shield and a laser receiver in front of the tunnel bridge shield, that is, a light-sensitive displacement array. First, the positions of the transmitter and the receiver are debugged to ensure that when the tunnel bridge posture is normal, the emitted laser beam will pass through the center position of the receiver. If the tunnel bridge shield shifts due to torque imbalance during the jacking process, the position of the receiver receiving the laser beam will change, and the direction and amount of change will be transmitted to the intelligent control system through real-time monitoring, and the force applied to the left or right jack behind the jacking will be adjusted to make the jacking return to the original direction as much as possible, reduce the "head deviation" and "snaking" effects during the jacking process, and ensure the smooth progress of the jacking.

[0021] Specifically, in step (3), the process of adjusting the thrust of the jack includes: when it is monitored that the laser beam emitted by the laser transmitter deviates to the left, the thrust of the jack providing the right-turn torque is reduced to achieve the required compensation bending moment and realize the deviation correction; when it is monitored that the laser beam emitted by the laser transmitter deviates to the right, the thrust of the jack providing the left-turn torque is reduced to achieve the required compensation bending moment and realize the deviation correction.

[0022] The compensation bending moment can be specifically calculated using a set of algorithms. When performing state analysis, the following parameters are defined. is the width of the tunnel building; Calculate the length of the first section of the tunnel (including the shield); is the width of the roadbed of the intersecting road; Prefabrication of acute angles for tunnel bridges; The intersection angle between two roads (acute angle value); According to the differences in the stress state, the jacking process can be divided into 7 states, such as Figure 4 As shown in the figure, the initial deflection torque is different under different pushing states.

[0023] like Figure 5 As shown, the center of mass of the bridge is O. The soil pressure on the first side is E1, which is perpendicular to the side wall of the frame, and the friction is f1, which is opposite to the jacking direction. The soil pressure on the rear side is E2, which is perpendicular to the side wall of the frame, and the friction is f2, which is opposite to the jacking direction. The top is reduced by a drag plate (roll plate). The friction on the top is relatively small and can be ignored. The bottom friction consists of two parts: the friction force corresponding to the self-weight of the bridge and the additional stress of the top soil. The friction line generated by the self-weight of the bridge passes through the center of mass O, and the torque is zero. The friction torque corresponding to the additional stress of the top soil is The maximum value is a certain value when in state: .m, the direction is clockwise, which is relatively small compared to the total torque of 50~150MN.m. During the simplification, the torque effect is ignored. The initial deflection torque (clockwise rotation is positive) can be obtained by taking the moment of the center of mass from different forces, see formula 1. The initial deflection torque after segmentation is shown in formula 2.

[0024] Formula 1:

[0025]

[0026] Formula 2:

[0027] Where: L1 is the arm of the earth pressure on the right side to the moment center, and L2 is the arm of the earth pressure on the left side to the moment center. It can be seen that E1, E2, f1, f2, L1, and L1 are all top strokes. piecewise function. In the above formula, E0 is the soil pressure per unit width, which can be calculated by Rankine's active earth pressure formula. In the derivation of the above formula, only the main force is considered, and the elastic resistance generated by the extrusion of the soil on both sides after the plane deflection of the bridge body is not deeply analyzed. In terms of state, the deflection torque is only the initial state of the plane deflection, and the elastic resistance generated by the extrusion of the soil on both sides after the deflection is a secondary state. It is precisely because of the existence of the elastic resistance of the soil that the continuous deflection of the bridge body is constrained and finally reaches a new torque equilibrium state. Specifically, the step (3) is controlled by a PLC controller, and its control process is as follows: Figure 3 As shown. Furthermore, the light-sensitive displacement array includes a central receiver and a plurality of side receivers, and the central receiver and the plurality of side receivers are arranged in a horizontal straight line, and the central receiver is located at the center of the arrangement straight line. In order to reduce the number of receivers set up and effectively reduce costs. The side receivers reciprocate close to and away from the central receiver, and the closer to the central receiver, the slower the movement speed of the side receivers. The central receiver is used to receive the signal of the laser beam at the exact position. When the central receiver receives the laser irradiation, it indicates that the posture of the tunnel bridge shield is correct. The side receivers are used to receive the irradiation of the offset laser beam. When the side receivers receive the irradiation of the laser beam, it indicates that the posture of the tunnel bridge shield is offset and needs to be adjusted.

[0028] The closer the multiple side receivers are to the center receiver during the movement process, the slower their movement speed is, and the farther they are from the center receiver, the faster their movement speed is. The purpose is that when the side receivers are close to the center receiver, the measurement accuracy requirement is relatively high. At this time, it is necessary to continuously and uninterruptedly transmit the position offset information of the laser beam to the controller so that the controller can make timely judgments, issue control instructions, and adjust the offset. In order to effectively ensure the integrity of the coverage area of ​​these receivers. The movement paths of the multiple side receivers form a straight line with a breakpoint located at the center receiver, and the movement paths of the multiple side receivers do not overlap. Specifically, if Figure 6 and Figure 7As shown, the light-sensing displacement array also includes a mounting seat 1, a first resisting block 8, a second resisting block 9, a first resisting spring 10, a second resisting spring 11, a first movable rod 12, a second movable rod 13, a resisting wheel 14 and a driving motor 17. The mounting seat 1 is provided with a first elongated hole 2 and a second elongated hole 3. A plurality of side receivers 19 located on one side of the central receiver 18 pass through the first elongated hole 2 and are connected to the first movable rod 12. A plurality of side receivers 19 located on the other side of the central receiver 18 pass through the second elongated hole 3 and are connected to the second movable rod 13. The first resisting block 8 and the second resisting block 9 are fixed on the mounting seat 1. One end of the first resisting spring 10 is connected to the first resisting block 8, and the other end is connected to an end of the first movable rod 12 away from the second movable rod 13. One end of the second resisting spring 11 is connected to the second resisting block 8. The top block 9 has the other end connected to the end of the second movable rod 13 away from the first movable rod 12, and the adjacent ends of the first movable rod 12 and the second movable rod 13 are pressed against the circumference of the pressing wheel 14, and the circumference of the pressing wheel 14 is provided with a symmetrically distributed first arc-shaped protrusion 15 and a second arc-shaped protrusion 16, and the driving motor 17 is connected to the pressing wheel 14 to drive the pressing wheel 14 to rotate. During operation, the driving motor 17 drives the pressing wheel 14 to rotate, and the pressing wheel 14 forms a pressing against the first movable rod 12 and the second movable rod 13 during the rotation process, and the first pressing spring 10 and the second pressing spring 11 provide a restoring force for the position recovery of the first movable rod 12 and the second movable rod 13, so that the movement of the first movable rod 12 and the second movable rod 13 is repeated, so that the movement of the first movable rod 12 and the second movable rod 13 can be driven to reciprocate, and the movement process of the side receiver 19 can be realized. In order to realize that when the side receiver 19 is closer to the center receiver 18, the movement speed is greater, and when it is farther away from the center receiver 18, the movement speed is smaller. The curvature of the first arc-shaped protrusion 15 and the second arc-shaped protrusion 16 is greater than the curvature of the abutting wheel 14. In order to achieve installation, the mounting seat 1 is provided with a mounting plate 4, and the mounting plate 4 is provided with a mounting through hole 5. In order to clean the receiver and prevent dust from adhering to the receiver and affecting the normal function of the receiver, the mounting seat 1 is provided with a protective frame 6 surrounding the central receiver 18 and the plurality of side receivers 19. The side wall of the protective frame 6 has an inner cavity, and the inner wall of the protective frame 6 is provided with an air injection hole connected to the inner cavity, and the outer wall of the protective frame 6 is provided with an air supply pipe 7 connected to the inner cavity. When working, the air blower is used to spray gas into the air supply pipe 7, and the gas passes through the inner cavity and is sprayed out from the air injection hole to blow away the dust adhering to the central receiver 18 and the side receiver 19, so as to prevent the dust from adhering to the central receiver 18 and the side receiver 19. At the same time, the setting of the protective frame 6 can also effectively protect the central receiver 18 and the side receiver 19.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "include..." or "comprise..." do not exclude the existence of other elements in the process, method, article or terminal device including the elements. In addition, in this article, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself.

[0030] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An intelligent deviation correction method for shield pushing of tunnel bridge, characterized in that: The method comprises the following steps: (1) arranging a laser emitter behind a tunnel bridge shield and arranging a light-sensitive displacement array in front of the tunnel bridge shield; (2) adjusting the positions of the light-sensitive displacement array and the laser emitter so that, in a correct posture, the laser beam emitted by the laser emitter is directly aligned with the center of the light-sensitive displacement array; (3) using the light-sensitive displacement array to monitor the offset of the laser beam emitted by the laser emitter, and adjusting the thrust of the jack according to the offset, so that the tunnel bridge shield is pushed forward in the correct direction; The light sensing displacement array includes a central receiver and a plurality of side receivers, wherein the central receiver and the plurality of side receivers are arranged in a horizontal straight line, and the central receiver is located at the center of the arrangement straight line; The photosensitive displacement array also includes a mounting seat, a first push-up block, a second push-up block, a first push-up spring, a second push-up spring, a first movable rod, a second movable rod, a push-up wheel and a driving motor. The mounting seat is provided with a first elongated hole and a second elongated hole. A plurality of the side receivers located on one side of the central receiver are connected to the first movable rod after passing through the first elongated hole, and a plurality of the side receivers located on the other side of the central receiver are connected to the second movable rod after passing through the second elongated hole. The first push-up block and the second push-up block are fixed to the mounting seat. One end of the first push-up spring is connected to the first push-up block, and the other end is connected to an end of the first movable rod away from the second movable rod. One end of the second push-up spring is connected to the second push-up block, and the other end is connected to an end of the second movable rod away from the first movable rod. The adjacent ends of the first movable rod and the second movable rod are pushed against the circumference of the push-up wheel. The circumference of the push-up wheel is provided with symmetrically distributed first arc-shaped protrusions and second arc-shaped protrusions. The driving motor is connected to the push-up wheel for driving the push-up wheel to rotate.

2. According to claim 1, a tunnel bridge shield pushing intelligent deviation correction method is characterized in that: In the step (3), the process of adjusting the thrust of the jack includes: when it is monitored that the laser beam of the laser emitted by the laser transmitter is deviated to the left, the thrust of the jack providing the right-turn torque is reduced to achieve the required compensation bending moment and realize the deviation correction; when it is monitored that the laser beam of the laser emitted by the laser transmitter is deviated to the right, the thrust of the jack providing the left-turn torque is reduced to achieve the required compensation bending moment and realize the deviation correction.

3. According to claim 2, a tunnel bridge shield pushing intelligent deviation correction method is characterized in that: The step (3) is controlled by a PLC controller.

4. According to claim 1, a tunnel bridge shield pushing intelligent deviation correction method is characterized in that: The side receivers make reciprocating motions approaching the center receiver and away from the center receiver, and the closer the side receivers are to the center receiver, the slower the movement speed of the side receivers.

5. According to claim 4, a tunnel bridge shield pushing intelligent deviation correction method is characterized in that: The movement paths of the plurality of side receivers form a straight line having a breakpoint located at the central receiver, and the movement paths of the plurality of side receivers do not overlap.

6. According to claim 1, a tunnel bridge shield pushing intelligent deviation correction method is characterized by: The curvatures of the first arc-shaped protrusion and the second arc-shaped protrusion are greater than the curvature of the abutting wheel.

7. According to claim 1, a tunnel bridge shield pushing intelligent deviation correction method is characterized by: The mounting seat is provided with a mounting plate, and the mounting plate is provided with a mounting through hole.

8. According to claim 1, a tunnel bridge shield pushing intelligent deviation correction method is characterized by: The mounting seat is provided with a protective frame surrounding the central receiver and the plurality of side receivers, the side wall of the protective frame has an inner cavity, the inner wall of the protective frame is provided with an air injection hole connected to the inner cavity, and the outer wall of the protective frame is provided with an air pipe connected to the inner cavity.

Images