Intelligent monitoring system for determining thickness of frozen wall

Abstract

The utility model discloses an intelligent monitoring system for determining the thickness of a frozen wall, which comprises a protective shell, a handle is arranged on the right side of the protective shell, the intelligent monitoring system further comprises a positioning assembly arranged in the protective shell, and the positioning assembly comprises a positioning block arranged in the protective shell. According to the intelligent monitoring system for determining the thickness of the frozen wall, by additionally arranging the positioning block, the placement stability of the vibration generator body and the vibration receiver body is improved, the situation that monitoring results are wrong due to shaking of the vibration generator body and the vibration receiver body is avoided, and meanwhile the monitoring accuracy is improved. The thickness of the freezing wall in the construction process can be effectively monitored in real time, and a theoretical basis is provided for key problems of freezing method construction; the real-time monitoring of the thickness of the frozen wall can provide a reliable basis for a constructor to adjust the power of circulating low-temperature saline water, and the economical efficiency of a freezing construction project is improved; a large amount of manpower and financial resources are saved; the device and method are simple and easy to understand and high in operability.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent monitoring systems, in particular to an intelligent monitoring system for determining the thickness of a frozen wall. Background Art

[0002] The ground freezing method, also known as ground freezing technology, is the most commonly used method for excavation in soft, water-containing and unstable strata. Due to the presence of groundwater, circulating low-temperature brine reduces the temperature of free water in the soil to below the freezing point, forming frozen soil with high strength and good water-proof performance. The frozen wall formed by freezing relies on its high strength and low permeability. It can ensure the safety of underground structure construction and its economy compared with other methods. Therefore, it is widely used in the construction of subway tunnels and connecting passages. However, the freezing method construction also has certain safety hazards. Considering that a frozen wall will be formed during the freezing process, if the thickness of the frozen wall is too low, its bearing capacity will be insufficient, and the excavation will be in danger of failure. When digging, it causes problems such as ground collapse; if the thickness of the frozen wall is too high, it will cause a waste of resources and cause excessive frost heave of the surrounding soil. Large-scale frost heave and thaw settlement will have an adverse effect on the buildings around the surface. Therefore, choosing an appropriate method to determine the thickness of the frozen wall is one of the key points of freezing construction and an important indicator for testing the freezing effect. Up to now, there is no monitoring device for determining the thickness of the frozen wall popular on the market, let alone applied to freezing projects. Based on this, it is urgent to develop a monitoring device for determining the thickness of the frozen wall to solve the problem of uncertainty in the thickness of the frozen wall and improve the safety and economy of construction.

[0003] However, the above-mentioned prior art solution has the following defects: it is difficult to achieve the overall limit of the intelligent monitoring device for determining the thickness of the frozen wall, and at the same time, it does not effectively monitor the thickness of the frozen wall during the construction process in real time. Therefore, the utility model provides an intelligent monitoring system for determining the thickness of the frozen wall to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide an intelligent monitoring system for determining the thickness of frozen walls, so as to solve the problem proposed in the above-mentioned background technology that it is difficult to achieve the overall limit of the intelligent monitoring device for determining the thickness of frozen walls, and at the same time, the thickness of frozen walls during the construction process cannot be effectively monitored in real time.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an intelligent monitoring system for determining the thickness of a frozen wall, comprising a protective shell, a handle is arranged on the right side of the protective shell, a protective door is installed on the front side of the protective shell, and a ventilation groove is connected to the front end of the protective door, and also comprises a positioning assembly arranged inside the protective shell, the positioning assembly comprises a positioning block arranged inside the protective shell, a vibration generator body is installed inside the positioning block, and a positioning plate is arranged inside the positioning block;

[0006] A vibration receiver body is arranged inside the positioning block, and the vibration receiver body releases a horizontal line, a signal collector is arranged inside the positioning plate, a signal transmission line is arranged on the right side of the signal collector, and a limit block is arranged on the outside of the signal transmission line, a connecting block is installed on the outside of the limit block, and a connecting bolt is connected inside the connecting block, an information computing system is installed on the right side of the signal transmission line, an alarm system is arranged on the right side of the information computing system, and an information storage system is connected to the right side of the information computing system.

[0007] Preferably, the ventilation grooves are arranged at equal intervals on the protective door.

[0008] Preferably, the positioning block is in an "L" shape, and the positioning block is arranged at equal angles with respect to the center of the vibration generator body and the vibration receiver body.

[0009] Preferably, the signal collector runs through the interior of the positioning plate and can collect horizontal lines emitted by the vibration receiver body and the vibration generator body.

[0010] Preferably, the signal transmission line is relatively engaged with the limit blocks, and the limit blocks are arranged at equal intervals on the signal transmission line.

[0011] Preferably, the connecting blocks are arranged at equal angles with respect to the center of the limiting block.

[0012] Preferably, the signal transmission line transmits the detected data to an information computing system for calculation.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the intelligent monitoring system for determining the thickness of the frozen wall improves the stability of the placement of the vibration generator body and the vibration receiver body by adding a positioning block. Compared with the traditional technology, it can avoid the situation where the vibration generator body and the vibration receiver body cause errors in the monitoring results due to shaking. At the same time, it can effectively monitor the thickness of the frozen wall during the construction process in real time, providing a theoretical basis for the key issues of freezing construction; real-time monitoring of the thickness of the frozen wall can provide a reliable basis for construction personnel to adjust the power of circulating low-temperature brine, thereby improving the economy of freezing construction projects; the characteristics of intelligent automatic alarm save a lot of manpower and financial resources; the device and method are simple and easy to understand, easy to operate, and can be directly applied to freezing projects. The specific operation is as follows;

[0014] 1. A positioning assembly and a protective shell are provided. By snapping the vibration receiver body and the vibration generator body into the interior of the positioning block, the four groups of positioning blocks are arranged at equal angles with respect to the center of the vibration generator body and the vibration receiver body, so as to facilitate the overall positioning of the intelligent monitoring device for determining the thickness of the frozen wall;

[0015] 2. A signal transmission line and a limit block are provided, and the signal transmission line and the limit block are connected by relative engagement, and the limit blocks are arranged at equal intervals on the signal transmission line, and the connection block is arranged at equal angles with respect to the center of the limit block, so as to facilitate the cable bundling operation of the signal transmission line;

[0016] Furthermore, by setting up an information calculation system, an alarm system and an information storage system, the thickness of the frozen wall during the construction process can be monitored in real time and effectively, providing a theoretical basis for the key issues of freezing construction. Real-time monitoring of the frozen wall thickness can provide a reliable basis for construction personnel to adjust the power of circulating low-temperature brine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the front view structure of the connection between (3) and (4) of the utility model;

[0019] Figure 3 It is a schematic cross-sectional view of the overall structure of a specific embodiment of the utility model;

[0020] Figure 4 The figure is a monitoring schematic diagram of a vertical section of a specific embodiment of the utility model.

[0021] In the figure: 1. protective shell; 2. handle; 3. protective door; 4. ventilation groove; 5. positioning assembly; 501. positioning block; 502. vibration generator body; 503. positioning plate; 6. signal collector; 7. vibration receiver body; 701. horizontal line; 8. signal transmission line; 9. limit block; 10. connecting block; 11. connecting bolt; 12. information computing system; 13. alarm system; 14. information storage system. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4The utility model provides a technical solution: an intelligent monitoring system for determining the thickness of a frozen wall, comprising a protective shell 1, a handle 2 is arranged on the right side of the protective shell 1, a protective door 3 is installed on the front side of the protective shell 1, and a ventilation groove 4 is connected to the front end of the protective door 3, and also comprises a positioning assembly 5 arranged inside the protective shell 1, the positioning assembly 5 comprises a positioning block 501 arranged inside the protective shell 1, and a vibration generator body 502 is installed inside the positioning block 501, and a positioning plate 503 is arranged on the inner side of the positioning block 501;

[0024] A vibration receiver body 7 is arranged inside the positioning block 501, and the vibration receiver body 7 releases a horizontal line 701, a signal collector 6 is arranged inside the positioning plate 503, a signal transmission line 8 is arranged on the right side of the signal collector 6, and a limit block 9 is arranged on the outside of the signal transmission line 8, a connecting block 10 is installed on the outside of the limit block 9, and a connecting bolt 11 is connected to the inside of the connecting block 10, an information computing system 12 is installed on the right side of the signal transmission line 8, and an alarm system 13 is arranged on the right side of the information computing system 12, and an information storage system 14 is connected to the right side of the information computing system 12, which together constitute an intelligent monitoring system for determining the thickness of the frozen wall.

[0025] like Figure 1 and Figure 2 As shown, the air grooves 4 are arranged at equal intervals on the protective door 3, the positioning blocks 501 are "L"-shaped, and the positioning blocks 501 are arranged at equal angles with respect to the centers of the vibration generator body 502 and the vibration receiver body 7. The protective door 3 on the front side of the protective shell 1 is opened, and the vibration receiver body 7 and the vibration generator body 502 are both snapped into the interior of the positioning blocks 501, so that the four groups of positioning blocks 501 are arranged at equal angles with respect to the centers of the vibration generator body 502 and the vibration receiver body 7, which facilitates the overall limiting of the intelligent monitoring device for determining the thickness of the frozen wall to avoid shaking and affecting the monitoring results.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, the signal collector 6 runs through the interior of the positioning plate 503, and the signal receiver 6 can collect the horizontal line 701 emitted by the vibration receiver body 7 and the vibration generator body 502, the signal transmission line 8 is relatively engaged with the limit block 9, and the limit block 9 is arranged at equal intervals on the signal transmission line 8, and the connection block 10 is arranged at equal angles with respect to the center of the limit block 9. The signal transmission line 8 transmits the detected data to the information calculation system 12 for calculation. The intelligent monitoring system for determining the thickness of the frozen wall includes an information generation module, an information transmission module and an information processing and decision-making module. The information generation module includes an intelligent vibration generator body 502 and a vibration receiver body 7. The vibration generator body 502 emits a vibration wave that propagates to the vibration receiver body 7;

[0027] The information transmission module transmits the collected time when the vibration generator body 502 emits the vibration wave and the time when the vibration receiver body 7 receives the vibration wave to the signal processing and decision-making module; the information processing and decision-making module is composed of an information calculation system 12, an alarm system 13 and an information storage system 14. The information storage system 14 is used to store the data required for calculating the thickness of the frozen wall. The information calculation system 12 is used to calculate the thickness of the frozen wall according to the provided data. The alarm system 13 determines whether the frozen wall thickness data calculated by real-time monitoring reaches the alarm threshold, that is, the artificially defined frozen wall design thickness. If it is reached, an alarm is issued. The information generation module has a built-in filter to eliminate the interference of other waves in the vibration wave transmission process.

[0028] The vibration generator body 502 and the vibration receiver body 7 are calibrated with the same time, which can accurately record the time when the signal is sent and received. The vibration generator body 502 is arranged at the midpoint between the freezing pipes on the outer edge of the lining segment, and the vibration receiver body 7 is arranged at a distance of 3.5 m, the connection line of the two instruments is perpendicular to the connection line between the freezing pipes, the information generation module needs to be arranged at the midpoint between the two freezing pipes adjacent to the side wall, to ensure that the position where the minimum freezing wall may appear is monitored, considering that the minimum thickness of the freezing wall is the midpoint of the connection line of the two freezing pipes on the side wall, the information generation module only needs to be arranged on the side of the freezing wall, the information transmission module is mainly composed of a signal transmission line 8, one end of the information transmission module is divided into two lines respectively connected to the vibration generator body 502 and the vibration receiver body 7 port, and the other end is connected to the information processing and decision module port, which is used to transmit the time when the vibration generator body 502 and the vibration receiver body 7 respond to the information processing and decision module, the information storage system 14 is used to store the time t1 when the vibration generator sends out the vibration wave, the time t2 when the vibration receiver body 7 detects the vibration wave, the time difference Dt of the response of the two instruments, the calculated thickness d of the freezing wall, and judge whether the thickness of the freezing wall reaches the alarm threshold, and records 1 if it reaches it, and records 0 if it does not reach it. The information calculation system 12 is used to calculate the time difference Dt between the response of the vibration receiver and the vibration generator, and calculate the thickness d of the freezing wall. Specifically, the calculation method is:

[0029]

[0030]

[0031] Among them, vf and vu are the propagation speeds of vibration waves in frozen soil and saturated natural soil respectively, L is the distance between the vibration generator body 502 and the vibration receiver body 7, the propagation speeds vf and vu of vibration waves in frozen soil and saturated natural soil are measured, and the basic wave velocity measurement method can be used to select soil samples on site, which are used as constants for calculating the thickness of the frozen wall. The alarm system 13 is developed based on a loop judgment statement. If the stored value is 1, the judgment is passed and an alarm is issued.

[0032] Before the intelligent monitoring system monitors the thickness of the frozen wall, it is necessary to install the freezing facilities first, and use expansion screws to fix the orifice pipe on the inner side of the tunnel segment according to the freezing design; then use a drill rod to drill a freezing hole of a certain length and insert the freezing; then use a clamping device to fix the position of the freezing pipe, insert the gate valve and small gate valve of the fixing device, and the freezing construction facilities are installed. The information generation module 2 includes an intelligent vibration generator 2.1 and a vibration receiver 2.2. A hole is drilled at the midpoint position of two adjacent freezing pipes 1.4 on the inner side of the tunnel segment 1.8, and the vibration generator 2.1 is installed on the outer edge of the segment;

[0033] A vibration receiver 2.2 is installed on the outer side of the frozen wall at a horizontal position 3.5 m away from the vibration generator 2.1 along the tunnel direction; the information transmission module is composed of a signal transmission line 8, one end of which is divided into two lines connected to the ports of the vibration generator body 502 and the vibration receiver body 7 respectively, and the other end is connected to the port of the information processing and decision-making module, and the time when the information generation module responds is transmitted to the information decision-making module; the information storage system 14 is used to store the propagation speeds vu and vf of the vibration wave in natural soil and frozen soil, the time difference data Dt monitored during the long-term monitoring process, and the frozen wall thickness d at each time calculated and output by the information calculation system 12, etc.

[0034] The alarm system 13 determines whether the thickness of the frozen wall reaches the alarm threshold, that is, the artificially defined design thickness of the frozen wall, based on the frozen wall thickness data calculated by real-time monitoring. If it reaches the threshold, an alarm is issued. The vibration generator body 502 and the vibration receiver body 7 are calibrated at exactly the same time to ensure that the recorded instrument response time difference is the time for the vibration wave to propagate between the two instruments. The vibration generator body 502 is arranged at the midpoint between the freezing pipe lines at the outer edge of the lining segment. The vibration receiver body 7 and the vibration generator body 502 are kept on the same horizontal plane with a spacing of 3.5 m. The line connecting the two instruments is perpendicular to the line between the freezing pipes. The information generation module can be arranged only on the side of the frozen wall, that is, the vertical side, because the minimum thickness of the frozen wall appears at the midpoint of the line connecting the two freezing pipes on the side. The propagation speeds vf and vu of the vibration wave in frozen soil and natural soil need to be determined in advance based on field tests or indoor tests. The intelligent monitoring method for the thickness of the frozen wall specifically includes the following steps:

[0035] Step S1: Determine the propagation velocities vf and vu of the selected vibration wave in the frozen soil and saturated natural soil. The soil samples are selected on site and the basic wave velocity measurement method is used as a constant for calculating the thickness of the frozen wall.

[0036] Step S2: Record the time t1 when the vibration generator body 502 emits the vibration wave and the time t2 when the vibration receiver body 7 receives the vibration wave, and transmit t1 and t2 to the information processing and decision-making module through the information transmission module.

[0037] Step S3: The information computing system 12 calculates the time difference Dt between the responses of the two instruments and solves the equations to obtain the thickness d of the frozen wall. The solution process is as follows:

[0038]

[0039] Where lf and lu are the distances that vibration waves propagate in frozen soil and saturated natural soil, respectively; Dtf and Dtu are the time that vibration waves propagate in frozen soil and saturated natural soil, respectively; the time that vibration waves propagate in frozen soil is calculated to be:

[0040]

[0041] The minimum thickness of the frozen wall is then:

[0042]

[0043] Step S4: Set the time interval between two vibration waves, intelligently obtain the minimum thickness of the frozen wall at different times, and predict the development process of the frozen wall.

[0044] Step S5: When the minimum thickness of the frozen wall meets the freezing design requirements, the alarm system 13 in the information processing and decision-making module will sound an alarm to remind the construction personnel that the thickness of the frozen wall has met the requirements. The low-temperature brine circulation power can be appropriately adjusted to improve the economic efficiency of the project, facilitate real-time and effective monitoring of the thickness of the frozen wall during the construction process, and provide a theoretical basis for key issues in freezing construction. This is the method of using the intelligent monitoring system for determining the thickness of the frozen wall.

[0045] The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent monitoring system for determining the thickness of a frozen wall, comprising a protective shell (1), a handle (2) being arranged on the right side of the protective shell (1), a protective door (3) being installed on the front side of the protective shell (1), and a ventilation groove (4) being connected to the front end of the protective door (3), Features: It also includes a positioning assembly (5) arranged inside the protective shell (1), the positioning assembly (5) including a positioning block (501) arranged inside the protective shell (1), a vibration generator body (502) being installed inside the positioning block (501), and a positioning plate (503) being arranged on the inner side of the positioning block (501); A vibration receiver body (7) is arranged inside a positioning block (501), and the vibration receiver body (7) releases a horizontal line (701); a signal collector (6) is arranged inside the positioning plate (503); a signal transmission line (8) is arranged on the right side of the signal collector (6), and a limit block (9) is arranged on the outside of the signal transmission line (8); a connection block (10) is installed on the outside of the limit block (9), and a connection bolt (11) is connected inside the connection block (10); an information computing system (12) is installed on the right side of the signal transmission line (8), an alarm system (13) is arranged on the right side of the information computing system (12), and an information storage system (14) is connected to the right side of the information computing system (12).

2. An intelligent monitoring system for determining frozen wall thickness according to claim 1, Features: The ventilation grooves (4) are arranged at equal intervals on the protective door (3).

3. An intelligent monitoring system for determining frozen wall thickness according to claim 1, Features: The positioning block (501) is in an "L" shape, and the positioning block (501) is arranged at equal angles with respect to the center of the vibration generator body (502) and the vibration receiver body (7).

4. An intelligent monitoring system for determining frozen wall thickness according to claim 1, Features: The signal collector (6) passes through the interior of the positioning plate (503), and the signal collector (603) can collect the horizontal lines (701) emitted by the vibration receiver body (7) and the vibration generator body (502).

5. An intelligent monitoring system for determining frozen wall thickness according to claim 1, Features: The signal transmission line (8) is relatively engaged and connected with the limit blocks (9), and the limit blocks (9) are arranged at equal intervals on the signal transmission line (8).

6. An intelligent monitoring system for determining frozen wall thickness according to claim 1, Features: The connecting block (10) is arranged at an equal angle with respect to the center of the limiting block (9).

7. An intelligent monitoring system for determining frozen wall thickness according to claim 5, Features: The signal transmission line (8) transmits the detected data to the information computing system (12) for calculation.

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