Rock stratum pipe-jacking pipe joint safety monitoring device and regulation and control method thereof

Abstract

The invention provides a rock stratum pipe-jacking pipe joint safety monitoring device and a regulation and control method thereof.The rock stratum pipe-jacking pipe joint safety monitoring device comprises a pushing device and a plurality of monitoring pipe joints, the pushing device comprises a second adjusting device, a first adjusting device is arranged on the second adjusting device, and at least four embedded concrete strain gauges are arranged on the monitoring pipe joints; and a plurality of surface strain gauges are annularly arranged on the inner wall of the monitoring pipe joint. When the medium-risk area and the high-risk area exist, the jacking force and the deflection state borne by the monitored pipe joint are analyzed, and when the jacking force is too large, secondary grout supplementing of the pipe joint in the medium-risk area and the high-risk area is enhanced; or slag removing holes are formed in the bottoms of part of the pipe joints for removing pipe bottom sediments. And when the compressive strain increment of a certain embedded concrete strain gauge is greater than that of the other embedded concrete strain gauges, the monitoring pipe joint deflects towards the side. The pipe feeding direction of the pipe jacking machine is adjusted, meanwhile, the deflection device is adjusted, so that the jacking force of the jacking device on the monitoring pipe joint in all directions is the same, and the local jacking force of the monitoring pipe joint is prevented from being too large.

Description

Technical Field

[0001] The invention relates to the field of pipe jacking construction, and in particular to a rock formation pipe jacking section safety monitoring device and a control method thereof. Background Art

[0002] In recent years, the application of pipe jacking technology in rock formations has been increasing, and cracking and damage of pipe sections have become a "stumbling block" in long-distance rock pipe jacking projects, seriously affecting the quality and safety of the project. In rock formations, a large vertical pressure is required when the cutter breaks the rock, that is, the head-on resistance is large, and as the compressive strength of the rock increases, the head-on resistance increases. At the same time, rock debris deposition is prone to occur during rock pipe jacking construction, resulting in increased friction and even pipe jamming. Under the influence of the above factors, the jacking force of rock pipe jacking is large, and there may be a sudden increase in the jacking force. In addition, the contact state between the pipe section and the hole wall in the rock formation is mainly point and line contact, and the contact area is small. When the pipe section deflects, the contact pressure between the pipe and the rock is large under the action of the lateral component of the jacking force, which can easily cause the pipe section structure to be damaged.

[0003] At present, there is still a lack of structural safety assurance methods that integrate structural monitoring, risk assessment, and prevention and control measures in rock jacking construction. Failure to monitor the structural status in real time may lead to potential problems (such as cracks, displacement, etc.) not being discovered in time, increasing safety risks. It is difficult to effectively assess uncertainties in construction, resulting in insufficient risk management and monitoring. To this end, we propose a rock formation jacking pipe section safety monitoring device and its control method to solve the above problems. Summary of the invention

[0004] The present invention provides a rock formation jacking pipe joint safety monitoring device and a control method thereof, which solve the problem that when the jacking force of the rock jacking pipe is large and the pipe joint deflection occurs, the contact pressure between the pipe and the rock is large under the action of the lateral component of the jacking force, which can easily cause the pipe joint structure to be damaged. At the same time, the pipe joint structure status cannot be monitored in real time, which increases the safety risk and the problem of insufficient monitoring.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rock formation jacking pipe section safety monitoring device and its control method, including a pushing device and multiple monitoring pipe sections, the pushing device includes a second adjustment device, the second adjustment device is provided with a first adjustment device, at least four embedded concrete strain gauges are provided on the monitoring pipe section, and multiple surface strain gauges are circumferentially provided on the inner wall of the monitoring pipe section.

[0006] In a preferred solution, the monitoring pipe segment includes a plurality of longitudinal steel bars in a circumferential array, the monitoring pipe segment includes an outer annular steel bar and an inner annular steel bar, and a through hole is provided on the monitoring pipe segment; The embedded concrete strain gauge is connected to the longitudinal steel bar. The embedded concrete strain gauge is arranged in at least four directions of the upper, lower, left and right directions of the monitoring pipe section. A threading steel pipe is provided on the through hole. The signal line of the embedded concrete strain gauge passes through the threading steel pipe and enters the inner wall of the monitoring pipe section.

[0007] In a preferred solution, the surface strain gauge is connected to the inner wall of the monitoring pipe segment by an adhesive, the surface strain gauges are arranged at 45° intervals, and the signal line of the surface strain gauge is against the inner wall of the monitoring pipe segment.

[0008] In a preferred solution, a vibrating string acquisition module and a wireless transmission module are provided on the inner wall of the monitoring pipe segment, and the vibrating string acquisition module is connected to the embedded concrete strain gauge and the surface strain gauge.

[0009] In a preferred solution, when a cracked pipe segment is monitored, it is marked as a cracked pipe segment, a plurality of cracks are arranged on the cracked pipe segment, a pull-wire displacement sensor is arranged at the crack, a current collection module is arranged on the inner wall of the cracked pipe segment, and the current collection module is connected to the plurality of pull-wire displacement sensors.

[0010] In the preferred solution, the entire pipeline is divided into a low-risk area, a medium-risk area, and a high-risk area according to the maximum value ε1 of the tensile strain of the segment pipe; When 0<ε1 ≤ 0.5εmax, it is a low-risk area; when 0.5εmax<ε1 ≤ 0.8εmax, it is a medium-risk area; when 0.8εmax<ε1 ≤ εmax, it is a high-risk area.

[0011] In the preferred solution, the embedded concrete strain gauge measures the jacking force of the monitoring pipe segment; The calculation formula of the jacking force is: Where Fi is the jacking force exerted on the i-th structural monitoring pipe segment; εi is the average strain measured by the embedded concrete strain gauge of the i-th structural monitoring pipe segment; Es is the elastic modulus of the steel bar; Ec is the elastic modulus of the concrete; As is the steel bar area of ​​the pipe segment cross section; Ac is the concrete area of ​​the pipe segment cross section.

[0012] In a preferred solution, the pushing device includes a plurality of hydraulic cylinders, one end of which is provided with a pushing column, on which a second adjusting device is provided, the second adjusting device has the same structure as the first adjusting device, and the top of the first adjusting device pushes the segment pipe section or the monitoring pipe section; The first adjusting device includes a top plate and a half shaft, a rotating seat is provided at both ends of the top plate, an annular groove is provided at both ends of the half shaft, the rotating seat abuts against the annular groove, a worm wheel is provided on the half shaft, a meshing worm is provided on the worm wheel, a first motor is provided at one end of the worm, and the first motor is mounted on the top plate.

[0013] In the preferred solution, a groove and a rotating seat are provided on the top plate, the worm is rotatably connected to the rotating seat, an outer ring and a rotating ring are provided on the rotating seat, the rotating ring abuts against the ring groove, the outer ring abuts against the side wall of the half shaft, a scale is provided on the rotating seat, and a pointer is provided on one side of the half shaft; A stop surface is provided on one side of the half shaft, and the top plate of the second adjusting device abuts against the stop surface of the half shaft.

[0014] A control method for a rock formation jacking pipe joint safety monitoring device, characterized by: S1, making a monitoring pipe joint and installing a jacking device; S2, jacking construction, after jacking multiple segments of pipes by jacking device, monitor the pipe segments hoisted in place, and collect the initial values ​​of embedded concrete strain gauges and surface strain gauges before applying the jacking device; S3. Accurately determine the level of each structural risk area based on the strain size and pipe joint position of the embedded concrete strain gauge and the surface strain gauge; S4. Analysis of pipe segment deflection status: Compare the data collected by the surface strain gauge with the data of risk area division. If the jacked areas are all low-risk areas, no preventive measures are required. S5. When the jacked areas are all medium and high risk areas, the jacking force and deflection state of the pipe segment are analyzed by embedded concrete strain gauges: A1. When the compressive strains of multiple strain gauges increase and the increments are the same, it means that the pipe segment has not deflected; A2. When the compressive strain increment of one of the strain gauges is greater than that of the other strain gauges, it means that the pipe segment has deflected to that side. The push-pushing device is driven to adjust the push-pushing deflection angle until the strains of multiple strain gauges are the same. A3. When the thrust force is too large, a slag cleaning hole is opened at the bottom of some pipe sections to clean the slag at the bottom of the pipe; S6. When the monitoring pipe section is marked as a cracked pipe section, a pull-wire displacement sensor is set at the crack for monitoring. If the crack continues to expand, the pipe section should be reinforced by grouting.

[0015] S7. When the pipe jacking machine reaches the receiving well, the pipe jacking is received.

[0016] The beneficial effects of the present invention are as follows: when the jacking force of the rock jacking pipe is large and there is a sudden increase in the jacking force, the jacking force of multiple hydraulic cylinders is reduced, and when the pipe segment deflects, the jacking direction of the jacking machine is adjusted to adjust the pipe entry route of the pipe segment so that the route of the pipe segment is on the right track, and the second adjusting device is driven to rotate the top plate of the second adjusting device relative to the half-axis, so that the first adjusting device is rotated relative to the second adjusting device, and the first adjusting device is driven to rotate the top plate of the first adjusting device relative to the half-axis, so that the jacking device can adjust the propulsion surface of the top plate, so as to adjust and monitor the force in various directions of the pipe segment, so as to avoid the phenomenon that the contact pressure between the pipe and the rock is large under the action of the lateral component of the jacking force, resulting in the destruction of the pipe segment structure.

[0017] The embedded concrete strain gauges are arranged at least in the upper, lower, left and right directions of the monitoring pipe segment. Multiple surface strain gauges are arranged circumferentially on the inner wall of the monitoring pipe segment. When cracks appear in the monitoring pipe segment, a wire displacement sensor is installed at the crack. The structural risk area is divided according to the maximum value of the tensile strain of the surface strain gauge, and the stress of the monitoring pipe segment is monitored in real time. When the jacked areas are all low-risk areas, no preventive measures are required.

[0018] When there are medium and high risk areas, analyze the jacking force and deflection status of the monitoring pipe segment. When the jacking force is too large, strengthen the secondary grouting of the pipe segments in the medium and high risk areas; or open slag cleaning holes at the bottom of some pipe segments to clean the sediment at the bottom of the pipe. When the compressive strain increment of a buried concrete strain gauge is greater than that of the other buried concrete strain gauges, it means that the monitoring pipe segment is deflected to that side. Adjust the pipe feeding direction of the jacking machine and the deflection device at the same time so that the jacking device has the same jacking force on the monitoring pipe segment in all directions, to avoid excessive jacking force in the local monitoring pipe segment, and avoid the phenomenon that the sudden increase of jacking force causes the pipe segment structure to be damaged.

[0019] When cracks appear on the surface of the monitoring pipe section, a wire displacement sensor is installed to monitor the cracks in real time. The overall structure performs structural monitoring, risk assessment and corrective measures for rock jacking construction. The present invention is an integrated structural safety assurance method for rock jacking construction, which can monitor the structural status in real time, close potential problems such as cracks or displacement that are not discovered in time, and reduce the risk of safety accidents. It effectively evaluates uncertainties in construction, enhances risk management and real-time monitoring, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a front view of the monitoring pipe section of the present invention; Figure 2 is a side view of the jacking device of the present invention; Figure 3is an axial side view of the deflection device of the present invention; Figure 4 is a side view of the deflection device of the present invention; Figure 5 is an isometric view of a first adjusting device of the present invention; Figure 6 is an axial side view of the top plate of the present invention; Figure 7 The present invention Figure 1 A magnified view of center A; Figure 8 The present invention Figure 1 Magnified view of middle B; Fig. 9 is a cross-sectional view of a cracked pipe section of the present invention; Fig.10 It is a schematic diagram of the risk area division of the present invention; In the figure: monitoring pipe section 1; longitudinal steel bar 101; outer annular steel bar 102; inner annular steel bar 103; through hole 104; embedded concrete strain gauge 2; cable tie 3; threading steel pipe 4; surface strain gauge 5; jacking device 6; deflection device 7; first adjustment device 8; top plate 801; groove 8011; swivel seat 8012; rotating seat 8013; outer ring 8014; swivel 8015; scale 8016; half shaft 802; annular groove 8021; blocking surface 8022; worm gear 803; worm 804; first motor 805; second adjustment device 9; hydraulic cylinder 10; push column 1001; adhesive 11; cracked pipe section 12; crack 13; wire-drawing displacement sensor 14; current acquisition module 15; vibrating string acquisition module 16; wireless transmission module 17; pipe jacking machine 18. DETAILED DESCRIPTION

[0021] Embodiment 1: like Figure 1-10A rock formation jacking pipe segment safety monitoring device and a control method thereof are provided, comprising a jacking device 6 and a plurality of monitoring pipe segments 1, the jacking device 6 comprising a second adjustment device 9, a first adjustment device 8 being arranged on the second adjustment device 9, at least four embedded concrete strain gauges 2 being arranged on the monitoring pipe segment 1, and a plurality of surface strain gauges 5 being arranged circumferentially on the inner wall of the monitoring pipe segment 1. With this structure, when the jacking force of the rock jacking pipe is large and there is a sudden increase in the jacking force, the jacking force of the multiple hydraulic cylinders 10 is reduced. When the pipe segment deflects, the jacking direction of the jacking machine 18 is adjusted to adjust the pipe entry route of the pipe segment so that the route of the pipe segment is on the right track, and the second adjusting device 9 is driven to rotate the top plate of the second adjusting device 9 relative to the half-axis, so that the first adjusting device 8 is rotated relative to the second adjusting device 9, and the first adjusting device 8 is driven to rotate the top plate 801 of the first adjusting device 8 relative to the half-axis 802, so that the jacking device 6 can adjust the propulsion surface of the top plate 801, so as to adjust and monitor the force in various directions of the pipe segment 1, so as to avoid the phenomenon that the contact pressure between the pipe and the rock is large under the action of the lateral component of the jacking force, which leads to the destruction of the pipe segment structure.

[0022] The embedded concrete strain gauges 2 are arranged at least in the upper, lower, left and right directions of the monitoring pipe segment 1. A plurality of surface strain gauges 5 are arranged circumferentially on the inner wall of the monitoring pipe segment 1. When a crack 13 appears in the monitoring pipe segment 1, a wire displacement sensor 14 is installed at the crack 13. The structural risk area is divided according to the maximum value of the tensile strain of the surface strain gauge 5, and the stress of the monitoring pipe segment 1 is monitored in real time. When the jacked areas are all low-risk areas, no preventive measures are required.

[0023] When there are medium and high risk areas, analyze the jacking force and deflection state of the monitoring pipe segment 1. When the jacking force is too large, strengthen the secondary grouting of the pipe segments in the medium and high risk areas; or open slag cleaning holes at the bottom of some pipe segments to clean the sediment at the bottom of the pipe. When the compressive strain increment of a certain embedded concrete strain gauge 2 is greater than that of the other embedded concrete strain gauges 2, it indicates that the monitoring pipe segment 1 is deflected to that side. Adjust the pipe feeding direction of the jacking machine 18 and the deflection device 7 at the same time, so that the jacking force of the jacking device 6 on the monitoring pipe segment 1 in all directions is the same, to avoid excessive jacking force in the local part of the monitoring pipe segment 1, and avoid the phenomenon that the sudden increase of jacking force causes the pipe segment structure to be damaged.

[0024] When cracks 13 appear on the surface of the monitoring pipe section 1, a wire displacement sensor 14 is installed to monitor the cracks 13 in real time. The overall structure performs structural monitoring, risk assessment and correction and prevention measures for rock jacking construction. The present invention is an integrated structural safety assurance method for rock jacking construction, which can monitor the structural status in real time, close potential problems such as cracks or displacement that are not discovered in time, and reduce the risk of safety accidents. Effectively evaluate uncertainties in construction, enhance risk management and real-time monitoring.

[0025] In a preferred embodiment, the monitoring pipe segment 1 includes a plurality of longitudinal steel bars 101 in a circumferential array, the monitoring pipe segment 1 includes an outer annular steel bar 102 and an inner annular steel bar 103, and a through hole 104 is provided on the monitoring pipe segment 1; The embedded concrete strain gauge 2 is connected to the longitudinal steel bar 101. The embedded concrete strain gauge 2 is arranged at least in the upper, lower, left and right directions of the monitoring pipe segment 1. The through hole 104 is provided with a threading steel pipe 4. The signal line of the embedded concrete strain gauge 2 passes through the threading steel pipe 4 and enters the inner wall of the monitoring pipe segment 1. With this structure, The embedded concrete strain gauge 2 is arranged in the middle of the steel cage near the pipe joint section, and is arranged at least in the upper, lower, left and right directions of the monitoring pipe joint 1. The signal line of the embedded concrete strain gauge 2 is led to the threading steel pipe 4 through the outer annular steel bar 102, and enters the inner wall of the pipe joint through the threading steel pipe 4. The threading steel pipe 4 is arranged on the side where the cable is placed in the pipe joint during the jacking construction, which is convenient for power connection. The threading steel pipe 4 is welded and fixed to the outer annular steel bar 102 and the inner annular steel bar 103.

[0026] In the preferred solution, the surface strain gauge 5 is connected to the inner wall of the monitoring pipe segment 1 through the adhesive 11, the surface strain gauge 5 is arranged at 45° intervals, and the signal line of the surface strain gauge 5 is against the inner wall of the monitoring pipe segment 1. With this structure, the surface strain gauge 5 is installed after the maintenance of the monitoring pipe segment 1 is completed. The surface strain gauge 5 is arranged circumferentially on the inner wall of the monitoring pipe segment 1 and is pasted by the adhesive 11. The surface strain gauge 5 is arranged at 45° intervals and is not installed at the bottom. When installing, sandpaper should be used to clean the dust on the inner wall of the monitoring pipe segment 1. The signal line of the surface strain gauge 5 is fixed to the inner wall of the pipe segment and is prohibited from passing through the bottom of the pipe.

[0027] In the preferred solution, a vibrating wire collection module 16 and a wireless transmission module 17 are provided on the inner wall of the monitoring pipe section 1, and the vibrating wire collection module 16 is connected to the embedded concrete strain gauge 2 and the surface strain gauge 5. With this structure, the monitoring data of the embedded concrete strain gauge 2 and the surface strain gauge 5 are collected by the vibrating wire collection module 16, and the data is transmitted to the cloud platform through the wireless transmission module 17, so as to realize the real-time transmission and analysis of the data. The first monitoring pipe section 1 is set within 30m behind the pipe jacking machine 18, and the subsequent monitoring pipe sections are preferably set at intervals of 100-200m.

[0028] In the preferred solution, when cracking of the monitoring pipe section 1 is marked as a cracked pipe section 12, a plurality of cracks 13 are provided on the cracked pipe section 12, a wire-type displacement sensor 14 is provided at the crack 13, a current acquisition module 15 is provided on the inner wall of the cracked pipe section 12, and the current acquisition module 15 is connected to the plurality of wire-type displacement sensors 14. With this structure, when cracking of the pipe section occurs during the jacking construction, a wire-type displacement sensor 14 should be installed at the crack 13 on the inner wall of the cracked pipe section 12. The monitoring data of the wire-type displacement sensor 14 is collected by the current acquisition module 15, and the data is transmitted to the cloud platform by the wireless transmission module 17, so as to realize the real-time monitoring of the opening amount of the crack 13.

[0029] In the preferred solution, the entire pipeline is divided into a low-risk area, a medium-risk area, and a high-risk area according to the maximum value ε1 of the tensile strain of the segment pipe; When 0<ε1 ≤ 0.5εmax, it is a low-risk area; when 0.5εmax<ε1 ≤ 0.8εmax, it is a medium-risk area; when 0.8εmax<ε1 ≤ εmax, it is a high-risk area.

[0030] In the preferred solution, the embedded concrete strain gauge 2 measures the jacking force of the monitoring pipe segment 1; The calculation formula of the jacking force is: In the formula, Fi is the jacking force on the i-th structural monitoring pipe segment 1; εi is the average strain measured by the embedded concrete strain gauge 2 of the i-th structural monitoring pipe segment 1; Es is the elastic modulus of the steel bar; Ec is the elastic modulus of the concrete; As is the steel bar area of ​​the pipe segment cross section; Ac is the concrete area of ​​the pipe segment cross section. In a preferred solution, the pushing device 6 includes a plurality of hydraulic cylinders 10, one end of each of the plurality of hydraulic cylinders 10 is provided with a pushing column 1001, and the pushing column 1001 is provided with a second adjusting device 9, the second adjusting device 9 has the same structure as the first adjusting device 8, and the top of the first adjusting device 8 pushes the segment pipe section or the monitoring pipe section 1; The first adjustment device 8 includes a top plate 801 and a half shaft 802. A rotating seat 8013 is provided at both ends of the top plate 801. An annular groove 8021 is provided at both ends of the half shaft 802. The rotating seat 8013 abuts against the annular groove 8021. A worm wheel 803 is provided on the half shaft 802. A meshing worm 804 is provided on the worm wheel 803. A first motor 805 is provided at one end of the worm 804. The first motor 805 is mounted on the top plate 801. According to this structure, the worm wheel 803 is mounted on the half shaft 802, and the first motor 805 is driven to rotate the worm 804, so that the worm 804 rotates relative to the half shaft 802, so that the top plate 801 rotates relative to the second adjustment device 9 to deflect the circumferential deflection angle of the deflection device 7.

[0031] The first motor of the second adjusting device 9 is driven to rotate the worm of the second adjusting device 9 so that the top plate of the second adjusting device 9 rotates relative to the hydraulic cylinder 10 to adjust the axial deflection angle of the deflection device 7. The first adjusting device 8 and the second adjusting device 9 are used in coordination so that the top plate 801 of the deflection device 7 can adapt to the pipe segment with any deflection angle.

[0032] In the preferred embodiment, a groove 8011 and a rotating seat 8012 are provided on the top plate 801, the worm 804 is rotatably connected to the rotating seat 8012, an outer ring 8014 and a rotating ring 8015 are provided on the rotating seat 8013, the rotating ring 8015 abuts against the annular groove 8021, the outer ring 8014 abuts against the side wall of the half shaft 802, a scale 8016 is provided on the rotating seat 8013, and a pointer is provided on one side of the half shaft 802; A stop surface 8022 is provided on one side of the half shaft 802, and the top plate of the second adjusting device 9 abuts against the stop surface 8022 of the half shaft 802. According to this structure, the pushing device 6 includes the deflection device 7 and the hydraulic cylinder 10, and the deflection device 7 includes the first adjusting device 8 and the second adjusting device 9. The hydraulic cylinder 10 is driven to make the push column 1001 push the deflection device 7, and the deflection device 7 pushes the pipe section.

[0033] Embodiment 2: Further description in conjunction with Example 1: A control method for a rock formation top pipe section safety monitoring device, characterized by: S1, production of a monitoring pipe section 1 and installation of a top pushing device 6; S2, jacking construction, after jacking multiple segment pipe segments by jacking device 6, monitoring pipe segment 1 is hoisted in place, and initial values ​​of embedded concrete strain gauge 2 and surface strain gauge 5 are collected before jacking device 6 is applied; S3, accurately determine the level of each structural risk area according to the strain size and pipe joint position of the embedded concrete strain gauge 2 and the surface strain gauge 5; S4. Analysis of pipe segment deflection status: Compare the data collected by the surface strain gauge 5 with the data of risk area division. If all the jacked areas are low-risk areas, no preventive measures are required. When the tensile strain ε of the concrete on the inner wall of the reinforced concrete pipe segment exceeds the ultimate tensile strain εmax, εmax can be selected through tests or recommended values ​​in the specification, and 110με can be selected for C50 concrete, and cracks will appear on the inner wall of the pipe segment. Therefore, the structural risk area can be divided by monitoring the maximum value of the tensile strain ε1 measured by the surface strain gauges 5 on the pipe segment 1. Specifically: ① 0<ε1 ≤ 0.5εmax is a low-risk area; ② 0.5εmax<ε1 ≤ 0.8εmax is a medium-risk area; ③ 0.8εmax<ε1 ≤ εmax is a high-risk area. During the jacking construction, the level and location of each structural risk area should be accurately determined in combination with the strain size of the inner wall of the pipe segment and the position of the pipe segment. The level and location of each structural risk area should be dynamically adjusted according to the strain condition of the subsequent structural monitoring pipe segment 1 when it passes through the area.

[0034] S5. When the jacked areas are all medium and high risk areas, the jacking force and deflection state of the pipe segment are analyzed by the embedded concrete strain gauge 2: The deflection state of the pipe segment is analyzed as follows: when the compressive strains of multiple embedded concrete strain gauges 2 all increase and the increments are similar, it means that the pipe segment has not deflected or the deflection angle is small; when the compressive strain increment of one of the embedded concrete strain gauges 2 is greater than that of the other embedded concrete strain gauges 2, it means that the pipe segment has deflected to that side. If the compressive strain increment of the concrete strain gauge on the left is greater than that on the right, top, and bottom, it means that the pipe segment has deflected to the left, and the greater the compressive strain increment, the greater the deflection angle.

[0035] A1. When the compressive strains of multiple strain gauges increase and the increments are the same, it means that the pipe segment has not deflected; A2. When the compressive strain increment of one of the strain gauges is greater than that of the other strain gauges, it indicates that the pipe segment is deflected to that side. The pushing device 6 is driven to adjust the pushing deflection angle position until the strain magnitudes of the multiple strain gauges are the same. A3. When the jacking force is too large, a slag cleaning hole is opened at the bottom of some pipe sections to clean the sediment at the bottom of the pipe; or the secondary grouting of pipe sections in medium and high risk areas is strengthened.

[0036] S6. When the monitoring pipe section 1 is marked as a cracked pipe section 12, a wire displacement sensor 14 is set at the crack 13 for monitoring. If the crack 13 continues to expand, the pipe section should be reinforced by grouting. For the structural monitoring pipe sections in medium and high risk areas, the frequency of data collection should be increased, and the effectiveness of the measures taken should be judged by the changes in data. At the same time, safety inspections should be strengthened.

[0037] S7. When the pipe jacking machine 18 reaches the receiving well, the pipe jacking is received.

[0038] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A rock formation top pipe joint safety monitoring device, characterized by: The invention comprises a pushing device (6) and a plurality of monitoring pipe segments (1), wherein the pushing device (6) comprises a second adjusting device (9), a first adjusting device (8) is arranged on the second adjusting device (9), at least four embedded concrete strain gauges (2) are arranged on the monitoring pipe segment (1), and a plurality of surface strain gauges (5) are arranged circumferentially on the inner wall of the monitoring pipe segment (1).

2. According to claim 1, a rock formation top pipe joint safety monitoring device is characterized by: The monitoring pipe segment (1) comprises a plurality of longitudinal steel bars (101) in a circumferential array, the monitoring pipe segment (1) comprises an outer annular steel bar (102) and an inner annular steel bar (103), and a through hole (104) is provided on the monitoring pipe segment (1); The embedded concrete strain gauge (2) is connected to the longitudinal steel bar (101). The embedded concrete strain gauge (2) is arranged at least in four directions, namely, the upper direction, the lower direction, the left direction and the right direction of the monitoring pipe segment (1). A threading steel pipe (4) is provided on the through hole (104). The signal line of the embedded concrete strain gauge (2) passes through the threading steel pipe (4) and enters the inner wall of the monitoring pipe segment (1).

3. According to claim 1, a rock formation top pipe joint safety monitoring device is characterized by: The surface strain gauge (5) is connected to the inner wall of the monitoring pipe segment (1) via an adhesive (11); the surface strain gauges (5) are arranged at 45° intervals; and the signal lines of the surface strain gauges (5) are against the inner wall of the monitoring pipe segment (1).

4. According to claim 1, a rock formation top pipe joint safety monitoring device is characterized by: A vibrating string collection module (16) and a wireless transmission module (17) are provided on the inner wall of the monitoring pipe segment (1), and the vibrating string collection module (16) is connected to the embedded concrete strain gauge (2) and the surface strain gauge (5).

5. According to claim 1, a rock formation top pipe joint safety monitoring device is characterized by: When a monitoring pipe segment (1) is cracked, it is marked as a cracked pipe segment (12); a plurality of cracks (13) are provided on the cracked pipe segment (12); a pull-wire type displacement sensor (14) is provided at the crack (13); a current acquisition module (15) is provided on the inner wall of the cracked pipe segment (12); and the current acquisition module (15) is connected to the plurality of pull-wire type displacement sensors (14).

6. The rock formation top pipe joint safety monitoring device according to claim 1 is characterized by: According to the maximum value of the tensile strain ε1 of the segment pipe, the entire pipeline is divided into low-risk area, medium-risk area and high-risk area; When 0 < ε1 ≤ 0.5εmax, it is a low-risk area; when 0.5εmax <ε1 ≤ 0.8εmax, it is a medium-risk area; when 0.8εmax <ε1 ≤ εmax, it is a high-risk area.

7. The rock formation top pipe joint safety monitoring device according to claim 1 is characterized by: The embedded concrete strain gauge (2) measures the jacking force of the monitoring pipe section (1); The calculation formula of the jacking force is: ; Wherein, Fi is the jacking force applied to the i-th structural monitoring pipe segment (1); εi is the average value of the strain measured by the embedded concrete strain gauge (2) of the i-th structural monitoring pipe segment (1); Es is the elastic modulus of the steel bar; Ec is the elastic modulus of the concrete; As is the steel bar area of ​​the pipe segment cross section; Ac is the concrete area of ​​the pipe segment cross section.

8. The rock formation top pipe joint safety monitoring device according to claim 1 is characterized by: The pushing device (6) comprises a plurality of hydraulic cylinders (10), one end of each of the plurality of hydraulic cylinders (10) is provided with a pushing column (1001), a second adjusting device (9) is provided on the pushing column (1001), the second adjusting device (9) has the same structure as the first adjusting device (8), and the first adjusting device (8) pushes the segment pipe section or the monitoring pipe section (1) from the top; The first adjustment device (8) comprises a top plate (801) and a half shaft (802); a rotating seat (8013) is provided at both ends of the top plate (801); an annular groove (8021) is provided at both ends of the half shaft (802); the rotating seat (8013) abuts against the annular groove (8021); a worm wheel (803) is provided on the half shaft (802); a meshing worm (804) is provided on the worm wheel (803); a first motor (805) is provided at one end of the worm (804); and the first motor (805) is mounted on the top plate (801).

9. A rock formation top pipe joint safety monitoring device according to claim 8, characterized in that: A groove (8011) and a rotating seat (8012) are provided on the top plate (801), the worm (804) is rotatably connected to the rotating seat (8012), an outer ring (8014) and a rotating ring (8015) are provided on the rotating seat (8013), the rotating ring (8015) abuts against the annular groove (8021), the outer ring (8014) abuts against the side wall of the half shaft (802), a scale (8016) is provided on the rotating seat (8013), and a pointer is provided on one side of the half shaft (802); A stop surface (8022) is provided on one side of the half shaft (802), and a top plate of the second adjustment device (9) abuts against the stop surface (8022) of the half shaft (802).

10. A control method for a rock formation top pipe joint safety monitoring device according to any one of claims 1 to 9, characterized in that: S1. Production of monitoring pipe segment (1) and installation of jacking device (6); S2, jacking construction, after jacking a plurality of pipe segments by means of a jacking device (6), the monitoring pipe segment (1) is hoisted into place, and before the jacking device (6) is applied, the initial values ​​of the embedded concrete strain gauge (2) and the surface strain gauge (5) are collected; S3, accurately determining the level of each structural risk area according to the strain magnitude and pipe joint position of the embedded concrete strain gauge (2) and the surface strain gauge (5); S4. Analysis of pipe segment deflection status: Compare the data collected by the surface strain gauge (5) with the data of risk area division. If all the areas that have been pushed forward are low-risk areas, no preventive measures are required. S5. When the areas that have been pushed in are all medium- and high-risk areas, the embedded concrete strain gauge (2) is used to analyze the jacking force and deflection state of the pipe segment: A1. When the compressive strains of multiple strain gauges increase and the increments are the same, it means that the pipe segment has not deflected; A2. When the compressive strain increment of one of the strain gauges is greater than that of the other strain gauges, it indicates that the pipe segment has deflected to that side. The push-pushing device (6) is driven to adjust the push-pushing deflection angle until the strains of the multiple strain gauges are the same. A3. When the thrust force is too large, a slag cleaning hole is opened at the bottom of some pipe sections to clean the slag at the bottom of the pipe; S6. When the monitoring pipe section (1) is marked as a cracked pipe section (12), a wire displacement sensor (14) is arranged at the crack (13) for monitoring. If the crack (13) continues to expand, the pipe section should be reinforced by grouting. S7. When the pipe jacking machine (18) reaches the receiving well, the pipe jacking is carried out.

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