Pipe jacking construction method for monitoring pipe jacking joint stress based on piezoelectric aggregate

Abstract

The invention discloses a pipe-jacking construction method for monitoring pipe-jacking pipe joint stress based on piezoelectric aggregate, and relates to the technical field of pipe-jacking construction. Comprising the following steps: acquiring a test piezoelectric aggregate, and electrically connecting the test piezoelectric aggregate with a test multicolor lamp group; carrying out a piezoelectric test, and recording the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multicolor lamp group; constructing a stress light relational graph between the stress of the piezoelectric aggregate and the light of the multicolor light group; arranging a monitoring piezoelectric aggregate with the same piezoelectric effect as the test piezoelectric aggregate in a reinforcement cage of the pipe jacking section, and integrally casting and molding the monitoring piezoelectric aggregate and the pipe jacking section; the monitoring piezoelectric aggregate poured in the pipe-jacking pipe joint is electrically connected with the monitoring multicolor lamp set; transferring the pipe jacking section provided with the monitoring piezoelectric aggregate to a pipe jacking station, and performing pipe jacking operation; and judging the stress condition of the pipe-jacking pipe joint according to the stress light relational graph based on monitoring the light emitting condition of the multi-color lamp group. According to the invention, the stress state of the pipe joint can be visually monitored in real time in the jacking process of the jacking pipe.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, and in particular to a pipe jacking construction method based on monitoring the stress of pipe sections of a pipe jacking using piezoelectric aggregates. Background Art

[0002] With the development of my country's economy, the scale of urbanization is expanding, and the utilization of underground space in cities is becoming more and more sufficient. Pipe jacking construction technology, as a non-excavation construction method, has the characteristics of small stratum disturbance, high construction efficiency, and little interference with traffic, and is widely used in underground engineering construction.

[0003] At the same time, with the development of pipe jacking technology, the single jacking length of pipe jacking is getting longer and longer, the strata passed through are becoming more and more complex, and the stress state of the pipe sections is becoming more and more complex. Especially in the long-distance and large-diameter pipe jacking construction in complex strata, there are often construction accidents such as pipe sticking (in the process of jacking in rock formations, as the jacking distance increases, the jacking speed of the pipe sections gradually increases due to the increase in frictional resistance, resulting in a decrease in the jacking speed or even stagnation of the pipe sections), and excessive local deflection of the pipe jacking (the connection between the two sections of the pipe jacking is uneven, and the uneven stress on the pipe sections during the jacking process causes local deflection of the pipe jacking).

[0004] When the above situation occurs during the construction process, if the location of the problem cannot be determined in time and the corresponding measures cannot be taken, the pipe section will be difficult to push forward. At this time, if the thrust is only increased, the risk of pipe section fracturing will be greatly increased, causing huge losses to the pipe jacking project. Therefore, monitoring during the pipe jacking construction process is becoming more and more important for guiding the construction.

[0005] The inventors have found that most of the existing monitoring methods in pipe jacking construction are to install monitoring devices in pipe joints, such as strain gauges, pressure boxes, etc., and then provide guidance for pipe jacking construction through the collected data. However, the above data is usually expressed in the form of frequency, which is not intuitive enough and it is difficult to display the location of construction accidents in time, especially when construction accidents occur, thereby increasing the risk of pipe joint rupture. In other words, the existing pipe jacking joint pressure monitoring method cannot detect problems in the construction process in the first time, and the construction risk is relatively high. Summary of the invention

[0006] In view of the technical problem that the existing method for monitoring the joint pressure of gas jacking pipes is difficult to timely discover problems existing in the construction process, the present invention provides a jacking construction method based on piezoelectric aggregate monitoring the stress of jacking pipe sections, which can monitor the stress state of the pipe sections in real time and intuitively during the jacking process, and adjust the construction method in time according to the joint stress state, thereby reducing the risk of jacking construction and reducing construction costs.

[0007] The present invention is achieved through the following technical solutions: The present invention provides a pipe jacking construction method based on monitoring the stress of pipe sections of the pipe jacking by piezoelectric aggregate, comprising the following steps: Obtaining a test piezoelectric aggregate, and electrically connecting the test piezoelectric aggregate to a test multicolor lamp set, wherein the test multicolor lamp set can change the color and brightness of the light according to the level of the power supply voltage; Performing a piezoelectric test on the test piezoelectric aggregate, and recording the stress on the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group; Based on the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, a stress-light relationship diagram between the stress of the piezoelectric aggregate and the light of the multi-color lamp group is constructed; The monitoring piezoelectric aggregate having the same piezoelectric effect as the test piezoelectric aggregate is arranged in the steel cage of the top pipe segment and integrally cast with the top pipe segment; The monitoring piezoelectric aggregate cast in the top pipe section is electrically connected to the monitoring multi-color lamp group, and the monitoring multi-color lamp group has the same electrical performance as the test multi-color lamp group; Transferring the pipe jacking section provided with the monitoring piezoelectric aggregate to the pipe jacking station and performing the pipe jacking operation; Based on the light emission of the monitoring multi-color lamp group, the stress condition of the top pipe section is determined according to the stress-light relationship diagram; Take appropriate treatment measures according to the stress conditions of the jacking pipe sections.

[0008] The present invention provides a pipe jacking construction method based on monitoring the stress of a pipe jacking section with piezoelectric aggregates. The method comprises the following steps: firstly obtaining a test piezoelectric aggregate and electrically connecting the test piezoelectric aggregate to a test multi-color lamp group, wherein the test multi-color lamp group can change the color and brightness of the light according to the level of the power supply voltage; then performing a piezoelectric test on the test piezoelectric aggregate, and recording the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group; and based on the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, constructing a stress-light relationship diagram between the stress of the piezoelectric aggregate and the light of the multi-color lamp group, thereby obtaining the relationship between the piezoelectric aggregate and the light of the multi-color lamp group; and then setting a monitoring piezoelectric aggregate having the same piezoelectric effect as the test piezoelectric aggregate in a steel cage of the pipe jacking section and integrally casting the monitoring piezoelectric aggregate with the pipe jacking section; and then electrically connecting the monitoring piezoelectric aggregate cast in the pipe jacking section to the monitoring multi-color lamp group, and moving the monitoring piezoelectric aggregate cast in the pipe jacking section to the monitoring multi-color lamp group, and moving the monitoring piezoelectric aggregate cast in the pipe jacking section to the pipe jacking station for pipe jacking operation, wherein the monitoring multi-color lamp group can change the color and brightness of the light according to the level of the power supply voltage.

[0009] During the process of pipe jacking, the force on the pipe sections of the pipe jacking is transmitted to the monitoring piezoelectric aggregate. Under the piezoelectric effect, the voltage generated by the monitoring piezoelectric aggregate supplies power to the monitoring multi-color light group, so that the monitoring multi-color light group emits light of corresponding color and intensity. Since the piezoelectric effect of the monitoring piezoelectric aggregate is the same as that of the testing piezoelectric aggregate, the stress condition of the pipe sections of the pipe jacking can be determined according to the light emission of the monitoring multi-color light group. Finally, according to the stress condition of the pipe sections of the pipe jacking, corresponding treatment measures can be taken to avoid pipe jamming and local deflection, thereby reducing the risk of pipe jacking construction and reducing construction costs.

[0010] Among them, the monitoring multi-color light group is lit by monitoring the piezoelectric effect of the pressure aggregate, so that the monitoring multi-color light group emits light of corresponding color and intensity, so as to judge the stress condition of the jacking pipe section by monitoring the light emission of the multi-color light group, and then intuitively display the load borne by the jacking pipe section during the advancement process, and timely display the location of the construction accident, so as to facilitate real-time adjustment of the construction method.

[0011] Therefore, the pipe jacking construction method based on piezoelectric aggregate monitoring of pipe joint stress provided by the present invention can monitor the stress state of the pipe joints in real time and intuitively during the pipe jacking process, and adjust the construction method in time according to the stress state of the joints, thereby reducing the risk of pipe jacking construction and reducing construction costs.

[0012] In an optional embodiment of the present application, the steps of obtaining the test piezoelectric aggregate are: Obtaining piezoelectric aggregates of set specifications; Connecting lines are implanted at both ends of the piezoelectric aggregate; placing the piezoelectric aggregate implanted with the connection circuit into a casting mold for monitoring the piezoelectric aggregate; Concrete with the same ingredients as the jacking pipe segment material is injected into the casting mold so that the test piezoelectric aggregate can truly simulate the working environment of the monitored piezoelectric aggregate, thereby ensuring that the stress-light relationship diagram can be used to monitor the stress condition of the pressure aggregate.

[0013] In an optional embodiment of the present application, the test multi-color light group and the monitoring multi-color light group are both red, green and blue lights, so as to ensure that the stress condition of the top pipe section can be determined intuitively and accurately through the color of the multi-color light group.

[0014] In an optional embodiment of the present application, the piezoelectric test includes a compressive stress test and a tensile stress test.

[0015] In an optional embodiment of the present application, the compressive stress test comprises the following steps: Placing the monitoring piezoelectric aggregate electrically connected to the test multi-color lamp set on the test bench of the test machine; A pressure which increases linearly with time is applied to the monitoring piezoelectric aggregate by a testing machine, and the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded.

[0016] In an optional implementation of the present application, the light emitted by the test multi-color light group for monitoring the piezoelectric aggregate before fracturing is used as the first warning light.

[0017] In an optional embodiment of the present application, when recording the light emitted by the multi-color lamp group, the light signal is converted into a digital signal by an optical sensor and fed back to a computer for storage, so as to ensure that an accurate stress-light relationship diagram can be obtained.

[0018] In an optional embodiment of the present application, the compressive stress test comprises the following steps: The testing machine is equipped with a tensile fixture, and the monitoring piezoelectric aggregate electrically connected to the test multi-color lamp group is clamped by the tensile fixture; A tensile force that increases linearly with time is applied to the monitoring piezoelectric aggregate by a testing machine, and the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded.

[0019] In an optional implementation of the present application, the light emitted by the test multi-color light group before the monitoring piezoelectric aggregate is cracked is used as the second warning light.

[0020] In an optional embodiment of the present application, before pushing the jacking pipe section, a wireless feedback optical detector is installed in the jacking pipe section to detect the light emission of the monitoring multi-color lamp group in real time through the wireless feedback optical detector. On the one hand, it is convenient to accurately detect the force on the jacking pipe section. On the other hand, the real-time data of the wireless feedback optical detector can be received by a computer, which is convenient for accurately comparing light and force through computer comparison and recording the load on the jacking pipe section for subsequent data analysis.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention provides a pipe jacking construction method based on piezoelectric aggregate monitoring of pipe jacking section stress. First, a test piezoelectric aggregate is obtained, and the test piezoelectric aggregate is electrically connected to a test multi-color lamp group. Then, a piezoelectric test is performed on the test piezoelectric aggregate, and the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded. Based on the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, a stress-light relationship diagram between the stress of the piezoelectric aggregate and the light of the multi-color lamp group is constructed, thereby obtaining the relationship between the piezoelectric aggregate and the light of the multi-color lamp group. Then, a monitoring piezoelectric aggregate with the same piezoelectric effect as the test piezoelectric aggregate is set in the steel cage of the pipe jacking section, and It is cast integrally with the jacking pipe section, and then the monitoring piezoelectric aggregate cast in the jacking pipe section is electrically connected to the monitoring multi-color light group, and moved to the jacking station for jacking operation. Under the piezoelectric effect, the voltage generated by the monitoring piezoelectric aggregate supplies power to the monitoring multi-color light group, so that the monitoring multi-color light group emits light of corresponding color and intensity. Since the piezoelectric effect of the monitoring piezoelectric aggregate is the same as that of the testing piezoelectric aggregate, the stress condition of the jacking pipe section can be determined according to the light emission of the monitoring multi-color light group. Finally, according to the stress condition of the jacking pipe section, corresponding treatment measures are taken to avoid pipe jamming and local deflection, thereby reducing the risk of jacking construction and reducing construction costs.

[0022] 2. The present invention provides a pipe jacking construction method based on piezoelectric aggregate monitoring of pipe jacking section stress. The piezoelectric effect of the pressure aggregate is monitored to light up the monitoring multi-color lamp group, so that the monitoring multi-color lamp group emits light of corresponding color and intensity. The stress condition of the pipe jacking section is judged by monitoring the light emission of the multi-color lamp group, and the load borne by the pipe jacking section during the advancement process is intuitively displayed, and the location of the construction accident is displayed in time, so as to facilitate real-time adjustment of the construction method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] in: Figure 1 A schematic flow chart of a pipe jacking construction method based on monitoring pipe jacking section stress using piezoelectric aggregates provided in an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of positive piezoelectric effect; Figure 3 This is a schematic diagram of the piezoelectric test process of an embodiment of the present invention; Figure 4 This is a structural principle diagram of a pipe jacking section according to an embodiment of the present invention; Figure 5 It is a structural principle diagram of a pipe jacking section according to an embodiment of the present invention.

[0025] Corresponding relationship between reference numerals and components in the accompanying drawings: 1. Piezoelectric aggregate; 2. Power circuit; 3. Test piezoelectric aggregate; 4. Multicolor lamp set; 5. Universal testing machine; 6. Optical sensor; 7. Pressing tablet; 8. Computer; 9. Wireless feedback optical detector; 10. Monitoring pipe section. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not need to be adopted to implement the present invention. In other embodiments, in order to avoid confusing the present invention, known methods are not specifically described.

[0029] Example

[0030] Combination Figure 1 This embodiment provides a pipe jacking construction method based on monitoring the stress of pipe sections of the pipe jacking by piezoelectric aggregate, comprising the following steps: S100, obtaining a test piezoelectric aggregate, and electrically connecting the test piezoelectric aggregate to a test multi-color lamp group, wherein the test multi-color lamp group can change light color and brightness depending on the level of the power supply voltage.

[0031] Specifically, piezoelectric aggregate can respond to changes in the external environment and the internal state of the structure. It has the ability to quickly convert pressure and vibration into electrical signals, that is, piezoelectric aggregate is a material with piezoelectric effect.

[0032] Combination Figure 2The piezoelectric effect is divided into positive piezoelectric effect and inverse piezoelectric effect. The positive piezoelectric effect is that when the piezoelectric aggregate is subjected to a sudden load, the positive and negative charges inside it will move to both ends respectively, and finally the positive charge will accumulate at one end and the negative charge will accumulate at the other end; the inverse piezoelectric effect is that when the polarization direction of the piezoelectric aggregate is in a sudden electric field, the piezoelectric aggregate will produce strain along the polarization direction.

[0033] In this embodiment, the piezoelectric effect principle of piezoelectric aggregate is used, and the specific piezoelectric equation includes the first piezoelectric equation and the second piezoelectric equation , where: i , j = 1,2,3; m,n =1,2…6; is the dielectric constant when stress is equal to zero or constant; represents the compliance coefficient; d represents the piezoelectric strain constant; E j Indicates the electric field strength; Indicates stress; represents electric displacement; represents the strain. Among them, the electric field strength E j With stress is the independent variable, electric displacement With strain is the dependent variable.

[0034] For testing multi-color lamp groups, RGB three-color lamps are generally used.

[0035] Combination Figure 3 , it can be understood that the steps to obtain the experimental piezoelectric aggregate are: S110, obtaining piezoelectric aggregate of set specifications, the size of the piezoelectric aggregate being determined according to the size of the jacking pipe segment; S120, implanting connection lines at both ends of the piezoelectric aggregate, that is, connecting both ends of the piezoelectric aggregate to corresponding connection cables; S130, placing the piezoelectric aggregate implanted with the connection circuit into a casting mold for monitoring the piezoelectric aggregate; S140. Inject concrete with the same ingredients as the jacking pipe segment material into the casting mold so that the test piezoelectric aggregate can truly simulate the working environment of the monitored piezoelectric aggregate, thereby ensuring that the stress-light relationship diagram can be used to monitor the stress condition of the pressure aggregate.

[0036] That is, the test piezoelectric aggregate is cast according to the proportion of the jacking pipe segment material, and the connecting cable is connected to the test multi-color lamp.

[0037] S200, performing a piezoelectric test on the test piezoelectric aggregate, and recording the stress on the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group.

[0038] Specifically, the piezoelectric test includes a compressive stress test and a tensile stress test.

[0039] Wherein, the compressive stress test comprises the following steps: S210, placing the monitoring piezoelectric aggregate electrically connected to the test multicolor lamp group on a test bench of a testing machine, generally using a universal test to conduct the test; S220, applying a pressure that increases linearly with time to the monitoring piezoelectric aggregate through a testing machine, and recording the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group.

[0040] Generally speaking, the stress of the test piezoelectric aggregate can be directly displayed by the universal testing machine. In this embodiment, the universal testing machine is connected to the computer for communication, so that the pressure data of the piezoelectric aggregate can be recorded and monitored in real time by the computer. At the same time, the color and intensity of the light emitted by the test multi-color lamp group under different pressures are recorded in real time by the optical sensor, and uploaded to the computer for storage. That is, when recording the light emitted by the multi-color lamp group, the optical sensor converts the light signal into a digital signal and feeds it back to the computer for storage, so as to ensure that an accurate stress-light relationship diagram can be obtained.

[0041] The light emitted by the test multicolor light group before the monitoring piezoelectric aggregate is fracturing is used as the first warning light. That is, when the monitoring piezoelectric aggregate is about to crack, the light emitted by the RGB light group at this time is recorded and marked as the warning light.

[0042] The compressive stress test comprises the following steps: S230, configuring a tensile fixture for the testing machine, and clamping the monitoring piezoelectric aggregate electrically connected to the test multi-color lamp group through the tensile fixture; S240, applying a tensile force that increases linearly with time to the monitoring piezoelectric aggregate through a testing machine, and recording the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group.

[0043] Generally speaking, the stress of the piezoelectric aggregate under test can be directly displayed by a universal testing machine. In this embodiment, the universal testing machine is connected to a computer for communication, so that the tensile force data of the piezoelectric aggregate can be recorded and monitored in real time by the computer. At the same time, the color and intensity of the light emitted by the test multi-color lamp group under different tensile forces are recorded in real time by an optical sensor, and uploaded to the computer for storage. That is, when recording the light emitted by the multi-color lamp group, the optical sensor converts the light signal into a digital signal and feeds it back to the computer for storage, so as to ensure that an accurate stress-light relationship diagram can be obtained.

[0044] The light emitted by the test multicolor light group before the monitoring piezoelectric aggregate is cracked is used as the second warning light. That is, when the monitoring piezoelectric aggregate is about to crack, the light emitted by the RGB light group is recorded and marked as the warning light.

[0045] S300. Based on the stress on the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, a stress-light relationship diagram between the stress on the piezoelectric aggregate and the light of the multi-color lamp group is constructed.

[0046] Specifically, after the single compression test is completed, the pressure and light color can be summarized by computer, and a compressive stress-light color relationship diagram can be drawn and saved on the computer. After the single tension test is completed, the pressure and light color can be summarized by computer, and a tensile stress-light color relationship diagram can be drawn and saved on the computer.

[0047] S400, placing a monitoring piezoelectric aggregate having the same piezoelectric effect as the test piezoelectric aggregate in a steel cage of the jacking pipe segment, and integrally casting the monitoring piezoelectric aggregate with the jacking pipe segment.

[0048] Combination Figure 4 Specifically, during the construction process, the piezoelectric aggregate is placed in the steel cage and cast together during the casting stage of the top pipe segment, and the power lines are reserved.

[0049] That is to say, in the actual engineering monitoring process, the piezoelectric aggregate can be fixed in the steel cage before the top pipe segment is cast. In order to more accurately represent the stress condition of the pipe segment, a piece of piezoelectric aggregate can be fixed at the top, bottom and both sides of the top pipe segment, and a power line can be reserved.

[0050] S500, electrically connecting the monitoring piezoelectric aggregate cast in the top pipe section to the monitoring multi-color lamp group, wherein the monitoring multi-color lamp group has the same electrical performance as the test multi-color lamp group (RGB lamps of the same type and batch).

[0051] Specifically, after the maintenance of the jacking pipe section is completed, the power line is electrically connected to the monitoring multi-color light group, and a wireless feedback optical detector capable of wirelessly transmitting data is set at an appropriate position inside the jacking pipe section. It should be noted that corresponding waterproof measures should be taken for the monitoring multi-color light group and the wireless feedback optical detector before jacking.

[0052] In this embodiment, before the jacking pipe section is pushed, a wireless feedback optical detector is installed in the jacking pipe section to detect the light emission of the monitoring multi-color lamp group in real time through the wireless feedback optical detector. On the one hand, it is convenient to accurately detect the force on the jacking pipe section. On the other hand, the real-time data of the wireless feedback optical detector can be received by the computer, which is convenient for accurately comparing the light and force through computer comparison and recording the load on the jacking pipe section for subsequent data analysis.

[0053] In this embodiment, the test multi-color light group and the monitoring multi-color light group are both red, green and blue lights, so as to ensure that the stress condition of the top pipe section can be determined intuitively and accurately through the color of the multi-color light group.

[0054] S600, transferring the pipe jacking section provided with the monitoring piezoelectric aggregate to the pipe jacking station, and performing the pipe jacking operation.

[0055] S700, based on the light emission of the monitoring multi-color lamp group, determine the stress condition of the top pipe section according to the stress-light relationship diagram.

[0056] After the pipe segment to be monitored starts to be pushed in, the piezoelectric aggregate generates voltage under stress. The generated voltage is supplied to the monitoring multi-color light group through the line. The monitoring multi-color light group emits corresponding light after being powered on. At this time, the stress at the corresponding position of the pipe segment can be judged according to the color and intensity of the light of the monitoring multi-color light group.

[0057] S800. Take appropriate treatment measures based on the stress conditions of the jacking pipe sections.

[0058] It is understandable that when the light generated by the monitoring multi-color light group reaches or exceeds the warning light, the work should be stopped immediately to find out the problem and take corresponding treatment measures. That is, the light emitted by the monitoring multi-color light groups at the four positions of the top pipe section is compared at the same time to judge the stress state of the top pipe section. When the light generated by one group of monitoring multi-color light groups or even multiple groups of monitoring multi-color light groups is about to or has reached the color intensity of the warning light, the work should be stopped immediately, and the lights at the top, bottom and left and right sides of the top pipe section are compared to preliminarily judge the type of construction accident, and determine the type of accident after professional monitoring, and then take corresponding treatment measures. After the treatment is completed, the light of the monitoring multi-color light group returns to the normal range, and normal construction can continue.

[0059] Specifically, when the monitoring multi-color light group sends out a warning light, if the lights on the four sides of the jacking pipe section show that the stress values ​​are all very large, or the stress value in one place is very large, and the stress values ​​in the other three places are not much different, it can be preliminarily determined that a stuck pipe has occurred. At this time, it is determined that the jacking pipe cannot move forward normally, and the method of retracting the jacking machine can be adopted to solve the problem by adjusting the direction and applying external force. For example, the direction of the main top jack can be reversed, a crossbeam can be added to the front end, the jacking machine can be connected to the crossbeam with a wire rope, and the jacking machine can be taken out by the reciprocating motion of the jack. In addition, the soil can be reinforced by grouting and other measures, or special equipment and technology can be used in areas with complex geological conditions to avoid stuck pipes. Specific measures to deal with stuck pipes are determined according to the construction environment of the construction site, and do not fall within the scope of protection required by this application, so this application will not be described in detail.

[0060] If the light generated by the multi-color light group is the second warning light, the lights at the top and bottom of the jacking pipe section show a large stress difference, the stress difference between the left and right sides is similar, or the stress values ​​on the left and right sides are very different while the stress values ​​at the top and bottom are similar, it can be inferred that the jacking pipe has local deflection. After detection by professionals, if it is determined that the jacking pipe is partially deflected, the following measures can be taken: When the axis and elevation deviation of the jacking construction reaches 20mm, deviation correction should be considered. For gradually accumulated deviations, the digging method can be used for correction. The specific method is to dig upward to correct the positive deviation according to the elevation deviation, or reduce or do not dig to correct the negative deviation. From the perspective of axis deviation, less digging can be done on one side and more on the other side. When the distance of the jacking pipe is short (less than 15m), if the pipe axis is found to be deviated, the main pressure jack can be used for correction. For example, if the pipe axis is offset to the right, the top iron on the right can be extended by 10~15mm more than the top iron on the left. In this way, when the jack is pushed forward, the jacking force on the right side is greater than that on the left side, so that the deviation on the right side can be corrected. Other forced correction methods will not be discussed in detail here.

[0061] Specific measures to deal with local deflection of the jacking pipe are determined according to the construction environment of the construction site and do not fall within the scope of protection required by this application, so this application will not provide a detailed description.

[0062] In summary, the present embodiment provides a method for pipe jacking construction based on monitoring the stress of pipe jacking sections with piezoelectric aggregates. First, a test piezoelectric aggregate is obtained, and the test piezoelectric aggregate is electrically connected to a test multi-color lamp group. The test multi-color lamp group can change the color and brightness of the light according to the power supply voltage. Then, a piezoelectric test is performed on the test piezoelectric aggregate, and the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded. Based on the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, a stress-light relationship diagram between the stress of the piezoelectric aggregate and the light of the multi-color lamp group is constructed, thereby obtaining the relationship between the piezoelectric aggregate and the light of the multi-color lamp group. Then, a monitoring piezoelectric aggregate having the same piezoelectric effect as the test piezoelectric aggregate is set in the steel cage of the pipe jacking section, and is integrally cast with the pipe jacking section. Then, the monitoring piezoelectric aggregate cast in the pipe jacking section is electrically connected to the monitoring multi-color lamp group, and is moved to the pipe jacking station for pipe jacking operations. The monitoring multi-color lamp group can change the color and brightness of the light according to the power supply voltage.

[0063] During the process of pipe jacking, the force on the pipe sections of the pipe jacking is transmitted to the monitoring piezoelectric aggregate. Under the piezoelectric effect, the voltage generated by the monitoring piezoelectric aggregate supplies power to the monitoring multi-color light group, so that the monitoring multi-color light group emits light of corresponding color and intensity. Since the piezoelectric effect of the monitoring piezoelectric aggregate is the same as that of the testing piezoelectric aggregate, the stress condition of the pipe sections of the pipe jacking can be determined according to the light emission of the monitoring multi-color light group. Finally, according to the stress condition of the pipe sections of the pipe jacking, corresponding treatment measures can be taken to avoid pipe jamming and local deflection, thereby reducing the risk of pipe jacking construction and reducing construction costs.

[0064] Among them, the monitoring multi-color light group is lit by monitoring the piezoelectric effect of the pressure aggregate, so that the monitoring multi-color light group emits light of corresponding color and intensity, so as to judge the stress condition of the jacking pipe section by monitoring the light emission of the multi-color light group, and then intuitively display the load borne by the jacking pipe section during the advancement process, and timely display the location of the construction accident, so as to facilitate real-time adjustment of the construction method.

[0065] In summary, the jacking construction method based on piezoelectric aggregate monitoring of jacking pipe segment stress provided in this embodiment can monitor the stress state of the pipe segment in real time and intuitively during the jacking process, and adjust the construction method in time according to the stress state of the joint, thereby reducing the risk of jacking construction and reducing construction costs.

[0066] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe jacking construction method based on piezoelectric aggregate monitoring of pipe jacking section stress, characterized in that: The following steps are involved: Obtaining a test piezoelectric aggregate, and electrically connecting the test piezoelectric aggregate to a test multicolor lamp set, wherein the test multicolor lamp set can change the color and brightness of the light according to the level of the power supply voltage; Performing a piezoelectric test on the test piezoelectric aggregate, and recording the stress on the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group; Based on the stress of the test piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group, a stress-light relationship diagram between the stress of the piezoelectric aggregate and the light of the multi-color lamp group is constructed; The monitoring piezoelectric aggregate having the same piezoelectric effect as the test piezoelectric aggregate is arranged in the steel cage of the top pipe segment and integrally cast with the top pipe segment; The monitoring piezoelectric aggregate cast in the top pipe section is electrically connected to the monitoring multi-color lamp group, and the monitoring multi-color lamp group has the same electrical performance as the test multi-color lamp group; Transferring the pipe jacking section provided with the monitoring piezoelectric aggregate to the pipe jacking station and performing the pipe jacking operation; Based on the light emission of the monitoring multi-color lamp group, the stress condition of the top pipe section is determined according to the stress-light relationship diagram; Take appropriate treatment measures according to the stress conditions of the jacking pipe sections.

2. The pipe jacking construction method based on monitoring the stress of the pipe jacking section by piezoelectric aggregate according to claim 1 is characterized in that: The steps to obtain the experimental piezoelectric aggregate are: Obtaining piezoelectric aggregates of set specifications; Connecting lines are implanted at both ends of the piezoelectric aggregate; placing the piezoelectric aggregate implanted with the connection circuit into a casting mold for monitoring the piezoelectric aggregate; Concrete having the same ingredients as the jacking pipe segment material is poured into the casting mold.

3. The pipe jacking construction method based on monitoring the stress of the pipe jacking section by piezoelectric aggregate according to claim 1 is characterized in that: The test multicolor lamp group and the monitoring multicolor lamp group both have red, green and blue three-color lamps.

4. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 1 is characterized in that: The piezoelectric test includes a compressive stress test and a tensile stress test.

5. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 4 is characterized in that: The compressive stress test comprises the following steps: Placing the monitoring piezoelectric aggregate electrically connected to the test multi-color lamp set on the test bench of the test machine; A pressure which increases linearly with time is applied to the monitoring piezoelectric aggregate by a testing machine, and the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded.

6. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 5 is characterized in that: The light emitted by the test multi-color lamp group for monitoring the piezoelectric aggregate before fracturing is used as the first warning light.

7. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 5 is characterized in that: When recording the light emitted by the multi-color lamp group, the light signal is converted into a digital signal through an optical sensor and fed back to a computer for storage.

8. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 5 is characterized in that: The compressive stress test comprises the following steps: The testing machine is equipped with a tensile fixture, and the monitoring piezoelectric aggregate electrically connected to the test multi-color lamp group is clamped by the tensile fixture; A tensile force that increases linearly with time is applied to the monitoring piezoelectric aggregate by a testing machine, and the force on the testing piezoelectric aggregate and the color and brightness of the light emitted by the multi-color lamp group are recorded.

9. The pipe jacking construction method based on monitoring the pipe jacking section stress of piezoelectric aggregate according to claim 8 is characterized in that: The light emitted by the test multi-color lamp group before the monitoring piezoelectric aggregate is cracked is used as the second warning light.

10. The pipe jacking construction method based on monitoring the stress of the pipe jacking section by piezoelectric aggregate according to any one of claims 1 to 9, characterized in that: Before the jacking pipe section is jacked, a wireless feedback optical detector is installed in the jacking pipe section to detect the light emission of the monitoring multi-color lamp group in real time through the wireless feedback optical detector.

Images