Well wall deformation detection and alarm device for pipe jacking working well

Abstract

The utility model discloses a pipe-jacking working well wall deformation detection alarm device, and relates to the technical field of trenchless engineering, in particular to a pipe-jacking working well wall deformation detection alarm device which comprises a control component and a plurality of detection components, and each detection component is installed on the inner side wall of a working well. The detection components are longitudinally arranged and installed on the inner side wall of the working well, and the deformation condition of the well wall of the working well is detected through multi-step distribution of the detection components. Wherein a plurality of fiber grating displacement sensors are supported and fixed through an annular frame, and a high-strength and high-hardness cross plate is mounted on a well wall; when the well wall of the working well deforms, the well wall of the working well drives the cross plate to slightly shift, the cross plate triggers a pull rod of the fiber bragg grating displacement sensor in the shift process, the fiber bragg grating displacement sensor detects that the well wall of the working well deforms, and the fiber bragg grating displacement sensor gives an alarm through the control panel. The purpose of detecting the deformation of the well wall of the working well is achieved.

Description

Technical Field

[0001] This utility model relates to the field of trenchless engineering technology, and more specifically to the field of well wall deformation detection and alarm technology during pipe jacking, specifically a well wall deformation detection and alarm device for pipe jacking. Background Technology

[0002] Trenchless pipe jacking is a trenchless engineering technology that involves jacking pipes section by section underground. This method eliminates the need for complete surface excavation, minimizing environmental impact. In pipe jacking construction, the working shaft (also known as the foundation pit, jacking shaft, drive shaft, or starting shaft) is the underground working space used to house the pipe jacking equipment, connect the pipe, and initiate the jacking process. The working shaft walls are constructed of poured concrete. After the concrete hardens, the walls are lowered to the target depth using a caisson method. Sometimes, bored piles are used for support. During foundation pit construction (caisson work) and subsequent pipe jacking operations, the working shaft's large inner diameter and depth, coupled with pressure from external soil and gravel, pose risks of deformation, cracking, and even collapse. These risks severely impact the safety of personnel and equipment inside the shaft, making structural safety a crucial aspect of construction management.

[0003] In a published Chinese patent application (publication number CN108627186A), titled "Fiber Optic Sensor System and Deformation Early Warning Method for Monitoring Wellbore Wall," the prior art simultaneously employs distributed fiber optic sensors, fiber optic strain sensors, external fiber optic temperature sensors, fiber optic long gauge length sensors, fiber optic angle sensors, and fiber optic displacement sensors to monitor the grouting pressure, deformation, and temperature of the inner wellbore wall, ensuring the long-term stability and reliability of the monitoring system. While this prior art can monitor and provide early warnings for the working well wall, it has certain limitations in practical implementation.

[0004] In its implementation, this existing technology involves creating pressure relief grooves on the inner wall of the well body and installing fiber optic grating sensors within these grooves to detect the displacement of the well wall during deformation. However, creating these pressure relief grooves significantly impacts the integrity and robustness of the well body. Because the well is located underground and is affected by the combined influence of soil and groundwater, there is a risk that deformation, cracking, or even collapse will occur preferentially from the pressure relief grooves. Therefore, this existing technology risks exacerbating well deformation, cracking, and even collapse. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a wellbore deformation detection and alarm device for pipe jacking working shafts, which solves the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a deformation detection and alarm device for a pipe jacking working shaft, comprising a working shaft and a back wall constructed of concrete components, the back wall being located at the inner bottom of the working shaft and closely attached to the inner side wall of the working shaft; further comprising a control component and multiple detection components, the detection components being arranged longitudinally in sequence and installed on the inner side wall of the working shaft; the control component being connected to each detection component; each detection component comprising a ring frame and multiple deformation detection assemblies, the ring frame being installed on the inner side wall of the working shaft, with a certain distance between the outer periphery of the ring frame and the inner side wall of the working shaft; each deformation detection assembly being arranged in a ring array on the ring frame; each deformation detection assembly comprising a cross plate and a fiber optic displacement sensor, the fiber optic displacement sensor being fixedly installed on the ring frame, the cross plate being fixedly installed on the inner side wall of the working shaft, and the cross plate being closely attached to the inner side wall of the working shaft; the end of the pull rod of the fiber optic displacement sensor being bonded to the cross plate.

[0009] Optionally, the detection component further includes multiple fixing components arranged in a ring array on the ring frame; each fixing component includes a threaded cylinder and a steel bolt, the threaded cylinder is welded to the outer peripheral sidewall of the ring frame, the steel bolt passes through the ring frame and the threaded cylinder, and the steel bolt is threadedly connected to the threaded cylinder, the end of the steel bolt away from the ring frame is inserted into the well wall of the working well, and the steel bolt is threadedly connected to the well wall of the working well.

[0010] Optionally, the control component includes a control board, a fiber Bragg grating demodulator, and an alarm component. The control board is electrically connected to the fiber Bragg grating demodulator and the alarm component, respectively. The fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating displacement sensor in each detection component.

[0011] Optionally, the alarm component includes an electric horn and an LED flashlight, both of which are fixedly installed on the working well; the control board is electrically connected to the electric horn and the LED flashlight respectively.

[0012] Optionally, the cross plate is made of either aluminum alloy or titanium alloy sheet.

[0013] (III) Beneficial Effects

[0014] This utility model provides a wellbore deformation detection and alarm device for pipe jacking working shafts, which has the following beneficial effects:

[0015] This invention relates to a wellbore deformation detection and alarm device for pipe jacking shafts. Through the coordinated arrangement of the wellbore, control components, and multiple detection components, the device effectively monitors the deformation of the wellbore wall. The detection components are longitudinally arranged and installed on the inner wall of the well, utilizing a multi-tiered distribution to detect wall deformation. Multiple fiber optic displacement sensors are supported and fixed by a ring frame. A high-strength, high-hardness crossplate is installed on the wellbore wall, with the pull rod end of the fiber optic displacement sensor bonded to the crossplate. When the wellbore wall deforms, the wall causes a slight shift in the crossplate. During this shift, the crossplate touches the pull rod of the fiber optic displacement sensor, which detects the deformation and issues an alarm via the control board, thus achieving the purpose of detecting wellbore wall deformation. Compared with existing technologies, this device avoids the need for pressure relief grooves in the wellbore, thereby preventing the wellbore wall from deforming, cracking, or collapsing due to these grooves. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a well wall deformation detection and alarm device for pipe jacking working well according to the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the working well in the jacking working well wall deformation detection and alarm device of this utility model;

[0019] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0021] Figure 5 This is a three-dimensional structural diagram of the annular frame in the well wall deformation detection and alarm device of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the cross plate in the well wall deformation detection and alarm device of the present invention.

[0023] In the diagram: 1. Working well; 2. Ring frame; 3. Cross plate; 4. Back wall; 5. Threaded cylinder; 6. Steel bolt; 7. Fiber optic grating displacement sensor. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0026] Please see Figures 1 to 6 The present invention provides a technical solution: a deformation detection and alarm device for a pipe jacking working shaft wall, comprising a working shaft 1 and a back wall 4 made of concrete components. The back wall 4 is located at the inner bottom of the working shaft 1 and is in close contact with the inner side wall of the working shaft 1.

[0027] During the pipe jacking operation, a large jack is installed at the bottom of the working shaft 1, with the jack back against the back wall 4, and the jack is used to push the pipe jacking.

[0028] A wellbore deformation detection and alarm device for pipe jacking working shafts also includes a control component and multiple detection components, which are arranged longitudinally in sequence and installed on the inner wall of the working shaft 1. The control component is connected to each detection component via control (including electrical connection).

[0029] The control unit is used to receive signals output by each detection unit. By arranging and installing each detection unit longitudinally on the inner wall of the working well 1, the deformation of the working well 1 wall is detected by the multi-step distribution of each detection unit, thereby realizing comprehensive detection of the working well 1 wall from top to bottom, that is, longitudinal detection, and realizing longitudinal multi-point detection of the inner wall of the working well 1.

[0030] The detection components include a ring frame 2 and multiple deformation detection assemblies. The ring frame 2 is installed on the inner wall of the working well 1, and there is a certain distance between the outer peripheral wall of the ring frame 2 and the inner wall of the working well 1. The deformation detection assemblies are arranged in a ring array on the ring frame 2.

[0031] The outer diameter of the annular frame 2 is smaller than the inner diameter of the working well 1. The various deformation detection components are arranged in a ring on the annular frame 2, which can perform comprehensive circumferential detection on the inner wall of the working well 1, that is, lateral detection, and realize multi-point lateral circumferential detection on the inner wall of the working well 1.

[0032] The deformation detection assembly includes a cross plate 3 and a fiber Bragg grating displacement sensor 7. The fiber Bragg grating displacement sensor 7 is fixedly mounted on the ring frame 2, and the cross plate 3 is fixedly mounted on the inner wall of the working well 1, with the cross plate 3 in close contact with the inner wall of the working well 1. The end of the pull rod of the fiber Bragg grating displacement sensor 7 is bonded to the cross plate 3. The cross plate 3 may be made of, but is not limited to, aluminum alloy or titanium alloy sheet.

[0033] The ring frame 2 supports and fixes the fiber Bragg grating displacement sensor 7. The cross plate 3 is made of high-strength, high-hardness materials such as aluminum alloy and titanium alloy, making it resistant to deformation under pressure. The cross plate 3 is used to transmit slight stress. When the well wall of the working well 1 deforms, the well wall causes the cross plate 3 to tilt slightly. During this tilting process, the cross plate 3 touches the pull rod of the fiber Bragg grating displacement sensor 7, which is bonded to it. The movement of the pull rod causes a change in the wavelength of the fiber Bragg grating in the fiber Bragg grating displacement sensor 7, thus detecting deformation of the well wall of the working well 1. The cross plate 3 increases the stress-receiving area of ​​the pull rod of the fiber Bragg grating displacement sensor 7 during well wall deformation, improving the sensitivity of the fiber Bragg grating displacement sensor 7 in detecting well wall deformation.

[0034] Specifically, the detection component also includes multiple fixing components, which are arranged in a ring array and installed on the ring frame 2. The fixing components include a threaded cylinder 5 and a steel bolt 6. The threaded cylinder 5 is welded to the outer peripheral side wall of the ring frame 2. The steel bolt 6 passes through the ring frame 2 and the threaded cylinder 5, and is threadedly connected to the threaded cylinder 5. The end of the steel bolt 6 away from the ring frame 2 is inserted into the well wall of the working well 1, and is threadedly connected to the well wall of the working well 1.

[0035] The fixing assembly is used to fix the annular frame 2 to the inner wall of the working well 1. The bolt 6, which passes through the annular frame 2 and the threaded cylinder 5, secures the annular frame 2 to the inner wall of the working well 1. The threaded cylinder 5 serves to fix the bolt 6 and also maintains a certain distance between the annular frame 2 and the wall of the working well 1. When the wall of the working well 1 undergoes local deformation, the wall pushes the annular frame 2 to shift via the bolt 6. The annular frame 2 causes a slight displacement of the fiber Bragg grating displacement sensor 7, causing the main body of the fiber Bragg grating displacement sensor 7 to shift relative to the pull rod (at this time, the end of the pull rod is bonded to the cross plate 3). Therefore, the pull rod on the fiber Bragg grating displacement sensor 7 moves relative to the main body of the fiber Bragg grating displacement sensor 7, thus detecting the deformation of the wall of the working well 1.

[0036] Specifically, the control components include a control board, a fiber Bragg grating demodulator, and an alarm assembly. The control board is electrically connected to both the fiber Bragg grating demodulator and the alarm assembly. The fiber Bragg grating demodulator is electrically connected to each detection component. Specifically, the fiber Bragg grating demodulator is electrically connected to each deformation detection component within the detection components. More specifically, the fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating displacement sensor 7 within the deformation detection components. The alarm assembly includes an electric horn and an LED flashlight, both of which are fixedly mounted on the working well 1. The control board is electrically connected to both the electric horn and the LED flashlight.

[0037] The control board includes, but is not limited to, a computer, a programmable logic controller (PLC), or a microcontroller. The control board contains internal software programs such as logic control programs and timing control programs to meet the needs of signal data reception and processing. The fiber Bragg grating displacement sensor 7 includes, but is not limited to, a fiber Bragg grating (FBG) sensor. The fiber Bragg grating demodulator includes, but is not limited to, a FAZT I4G fiber Bragg grating demodulator. The FAZT I4G fiber Bragg grating demodulator has four channels, each channel can connect to one to thirty fiber Bragg grating (FBG) sensors, for a total of four channels and one hundred and twenty sensors. The fiber Bragg grating displacement sensor 7 is connected to the fiber Bragg grating demodulator via an optical fiber transmission line. An electric horn and LED flashlight are used for audible and visual alarms to alert construction personnel, enabling them to promptly detect deformation of the well wall in working well 1.

[0038] Deformation of the well wall of working well 1 causes the rod of fiber Bragg grating displacement sensor 7 to move. This movement results in a change in the wavelength of the fiber Bragg grating within the sensor. The wavelength value is read by a fiber Bragg grating demodulator. After data processing, the wavelength change is converted into a displacement. The demodulator transmits the relevant data to the control board. Responding to the demodulator, the control board activates an electric horn and LED flashlight. The horn sounds an alarm, and the LED flashlight blinks, alerting construction personnel through sound and light. This allows them to promptly detect the deformation of the well wall and escape or reinforce the well.

[0039] The device shown in this technical solution also includes other parts and electrical components in the specific implementation process, which are used to meet the actual implementation needs of the device in the construction process, to improve the device, and to enable the device to adapt to various on-site construction environments.

[0040] The device shown in this technical solution is not only applicable to the field of pipe jacking wells, but also to well wall deformation detection in other fields.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A deformation detection and alarm device for a pipe jacking working shaft, comprising a working shaft (1) cast from concrete components and a back wall (4), wherein the back wall (4) is located at the inner bottom of the working shaft (1) and is in close contact with the inner sidewall of the working shaft (1); characterized in that: It also includes a control component and multiple detection components, each of which is arranged longitudinally in sequence and installed on the inner wall of the working well (1); the control component is connected to each of the detection components in a control manner. The detection component includes a ring frame (2) and multiple deformation detection components. The ring frame (2) is installed on the inner wall of the working well (1), and there is a certain distance between the outer peripheral wall of the ring frame (2) and the inner wall of the working well (1). Each deformation detection component is arranged in a ring array on the ring frame (2). The deformation detection assembly includes a cross plate (3) and a fiber optic grating displacement sensor (7). The fiber optic grating displacement sensor (7) is fixedly installed on the ring frame (2). The cross plate (3) is fixedly installed on the inner wall of the working well (1), and the cross plate (3) is in close contact with the inner wall of the working well (1). The end of the pull rod of the fiber optic grating displacement sensor (7) is bonded to the cross plate (3).

2. The wellbore deformation detection and alarm device for pipe jacking working shafts according to claim 1, characterized in that: The detection component also includes multiple fixing components, which are arranged in a ring array and installed on the ring frame (2). The fixing components include a threaded cylinder (5) and a steel bolt (6). The threaded cylinder (5) is welded to the outer peripheral side wall of the ring frame (2). The steel bolt (6) passes through the ring frame (2) and the threaded cylinder (5), and the steel bolt (6) is threadedly connected to the threaded cylinder (5). The end of the steel bolt (6) away from the ring frame (2) is inserted into the well wall of the working well (1), and the steel bolt (6) is threadedly connected to the well wall of the working well (1).

3. The wellbore deformation detection and alarm device for pipe jacking working shafts according to claim 1, characterized in that: The control components include a control board, a fiber Bragg grating demodulator, and an alarm component. The control board is electrically connected to the fiber Bragg grating demodulator and the alarm component, respectively. The fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating displacement sensor (7) in each detection component.

4. The wellbore deformation detection and alarm device for pipe jacking working shafts according to claim 3, characterized in that: The alarm components include an electric horn and an LED flashlight, both of which are fixedly installed on the working well (1); the control board is electrically connected to the electric horn and the LED flashlight respectively.

5. The wellbore deformation detection and alarm device for pipe jacking working shafts according to claim 1, characterized in that: The cross plate (3) is made of either aluminum alloy or titanium alloy.

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