A real-time monitoring method for water impermeable cement grouting

Abstract

The embodiment of the present application relates to the field of engineering construction, and discloses a real-time monitoring method for anti-seepage cement grouting. In the present application, an anti-seepage trench is dug on the side of the communication pipeline, which facilitates the release of the seepage pressure of the cement slurry during the cement grouting process; the parameters of the anti-seepage trench are determined according to the foundation pit site, the communication pipeline and the grouting mode, so as to ensure that the dug anti-seepage trench can be fitted to the actual size of the foundation pit, thereby effectively preventing the cement slurry seepage during the cement grouting process; and the infrared grating alarm is used to monitor the cement slurry accumulation in the anti-seepage trench in real time, so as to prevent and remove the excessive seepage cement slurry in advance, thereby preventing the cement slurry from seeping into the communication pipeline and reducing the economic loss.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the field of engineering construction, in particular to a real-time monitoring method for cement grouting with anti-permeation. BACKGROUND

[0002] With the continuous expansion of the subway construction scale, the foundation pit also develops in the direction of "dense, deep and large", and the safety of the foundation pit is ensured through the grouting reinforcement mode, and the surrounding environment is protected, therefore, the application of grouting reinforcement technology in the subway deep foundation pit engineering is also paid more and more attention by people. Because the communication pipeline is arranged beside the foundation pit, when the cement grouting is carried out, the cement grouting will penetrate into the communication pipeline along the well brick joint, the pipeline joint and the gap of the communication pipeline manhole, so that the cement blocks are left in the communication pipeline and the manhole, and in severe cases, the optical cable in the communication pipeline and the manhole will be wrapped by the cement, resulting in displacement and clumping of the optical cable, which cannot be pulled out; the standby pipe hole left in the pipeline will also be blocked due to the penetration of the cement grouting. If the cement blocks around the communication optical cable are removed by using equipment, the in-use communication optical cable is extremely likely to be damaged, causing the communication pipeline maintenance influence, and even the communication interruption, which affects the maintenance of the optical cable in the later period. At present, when the communication pipeline cannot be normally maintained due to the cement grouting clumping, the abandoned communication pipeline is reconstructed, the new communication pipeline is reconstructed, and the communication optical cable is relocated for subsequent maintenance.

[0003] However, the reconstruction of the communication pipeline and the relocation of the communication pipeline need a large amount of manpower and material resources, and a very high cost is needed to realize the relocation of the communication pipeline. Therefore, a real-time monitoring method for cement grouting with anti-permeation is urgently needed to prevent and remove the excessive penetration of the cement grouting, so as to prevent the cement grouting from penetrating into the communication pipeline and reduce the economic loss. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a real-time monitoring method for cement grouting with anti-permeation, which can monitor the penetration of the cement grouting in real time through the monitoring system, prevent and remove the excessive penetration of the cement grouting in advance, so as to prevent the cement grouting from penetrating into the communication pipeline and reduce the economic loss.

[0005] To solve the above technical problems, the embodiment of the present application provides a real-time monitoring method for anti-permeation cement grouting, comprising the following steps: S1, determining parameters of an anti-permeation trench and a protection hole according to a foundation pit site and a communication pipeline and a grouting mode; S2, opening the anti-permeation trench and the protection hole on one side of the foundation pit site close to the communication pipeline according to the parameters of the anti-permeation trench and the protection hole; S3, installing a monitoring alarm in the protection hole and starting grouting; S4, starting the monitoring alarm to monitor the cement grouting penetration in real time; S5, if the monitoring alarm starts to alarm, closing the monitoring alarm and extracting the cement mortar in the protection hole; S6, if the monitoring alarm does not start to alarm, continuing to monitor the cement grouting penetration in real time through the monitoring alarm; S7, repeating the steps S5-S6 until the cement grouting is completed; S8, after a preset time length after the grouting is completed, removing the monitoring alarm in the protection hole; and S9, backfilling the anti-permeation trench and the protection hole and leveling and repairing the road surface.

[0006] S8, after a preset time length after the grouting is completed, removing the monitoring alarm in the protection hole; and S9, backfilling the anti-permeation trench and the protection hole and leveling and repairing the road surface.

[0007] In the embodiment of the present application, the anti-permeation trench is dug on the side of the communication pipeline, which facilitates the release of the permeation pressure of the cement mortar during the cement grouting process; the parameters of the anti-permeation trench are determined according to the foundation pit site, the communication pipeline and the grouting mode, so that the dug anti-permeation trench can be fitted to the actual size of the foundation pit, thereby effectively preventing the cement mortar from permeating during the cement grouting process; and the infrared grating alarm is used to monitor the accumulation of the cement mortar in the anti-permeation trench in real time, so that the excessive permeated cement mortar can be extracted early, thereby preventing the cement mortar from permeating into the communication pipeline and reducing economic losses.

[0008] In addition, the width of the anti-permeation trench is 0.1-0.2 m or 0.4-0.5 m; and the width of the protection hole is equal to that of the anti-permeation trench. Different sizes of the width of the anti-permeation trench are set according to different permeation pressures of the cement mortar, so that the anti-permeation trench can be opened according to the actual situation, that is, even in the case of a large cement grouting pressure, the anti-permeation trench can be opened to release the pressure of the cement grouting, and the cement mortar can be prevented from permeating in the case of a large cement grouting pressure.

[0009] In addition, the trench and the protective hole are dug according to the parameters of the anti-permeation trench and the protective hole, specifically including: a trench and a protective hole are dug on the side of the foundation pit site close to the communication pipeline and fitted to the foundation pit site; the anti-permeation trench is greater than or equal to 0.2 m away from the communication pipeline. By leaving a certain preset distance between the anti-permeation trench and the communication pipeline, when the cement slurry penetration is more serious, even if the cement slurry continues to penetrate to the side of the communication pipeline through the anti-permeation trench, it also needs to penetrate through the preset distance to penetrate into the communication pipeline, which facilitates the timely adoption of measures to prevent the continuous penetration of the cement slurry before the cement slurry penetrates into the communication pipeline.

[0010] In addition, the anti-permeation trench is paved with an anti-permeation material; the anti-permeation material is paved on the inner side wall of the side of the anti-permeation trench close to the communication pipeline and the bottom wall of the anti-permeation trench. By arranging the anti-permeation material on the inner side wall of the side of the anti-permeation trench close to the communication pipeline and the bottom wall of the anti-permeation trench, the side and the bottom of the anti-permeation trench facing the communication pipeline have stronger anti-permeation capability, effectively inhibiting the penetration of the cement slurry to the side of the communication pipeline during the cement grouting process, thereby further strengthening the anti-permeation effect of the anti-permeation trench.

[0011] In addition, a speed bump or a steel plate is arranged above the anti-permeation trench. By arranging the speed bump or the steel plate above the anti-permeation trench, the vehicles driving on the excavated road surface are prompted to slow down, and the road surface where the anti-permeation trench is dug can be ensured to be normally passable.

[0012] In addition, the monitoring alarm is an infrared grating alarm. By using the infrared grating alarm to monitor the cement grouting in real time, when the infrared grating alarm detects that the cement slurry rises to a certain height in the anti-permeation trench, that is, the cement slurry accumulates to a certain degree and has a risk of penetration, the infrared grating alarm can timely issue an alarm to notify the operating personnel to timely withdraw the cement slurry penetrated into the anti-permeation trench, thereby reducing the occurrence of the cement slurry penetration. BRIEF DESCRIPTION OF DRAWINGS

[0013] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0014] Figure 1 is a flow chart of the real-time monitoring method for anti-permeation cement grouting provided in an embodiment of the present application;

[0015] Figure 2 is a connection structure schematic diagram of the infrared grating alarm provided in an embodiment of the present application;

[0016] Figure 3 This is a schematic diagram of the interface of the infrared grating transmitter of the infrared grating alarm provided in one embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the interface of the infrared grating receiver of the infrared grating alarm provided in one embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of the present invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0019] The following is a detailed description of the implementation details of a real-time monitoring method for anti-seepage cement grouting in this embodiment. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0020] One embodiment of the present invention relates to a real-time monitoring method for impermeable cement grouting, which can be applied in the construction process of deep foundation pit engineering. In this embodiment, the method includes the following steps:

[0021] Step 1: Determine the parameters of the anti-seepage trench and protective tunnel based on the site of the foundation pit, the communication pipeline, and the grouting method.

[0022] In one example, determining the parameters of the anti-seepage trench and the protective tunnel based on the foundation pit site, communication pipeline, and grouting method specifically includes: determining the length of the anti-seepage trench based on the length of the foundation pit site; determining the depth of the anti-seepage trench and the protective tunnel based on the depth of the communication pipeline; and determining the width of the anti-seepage trench and the protective tunnel based on the maximum grouting pressure of the grouting method; wherein the length of the anti-seepage trench is greater than or equal to the length of the foundation pit site; and the depth of the anti-seepage trench and the protective tunnel is greater than the depth of the communication pipeline.

[0023] In one example, the width of the anti-permeation trench is 0.1m-0.2m, or 0.4m-0.5m; the width of the anti-permeation trench is equal to the width of the protection hole. By setting the width of the anti-permeation trench according to the pressure of the cement paste, the width of the anti-permeation trench can be set according to the actual situation, that is, even if the pressure of the cement paste is high, the pressure of the cement paste can be released by setting a wider anti-permeation trench, and the cement paste can be prevented from permeating even if the pressure of the cement paste is high.

[0024] Specifically, the grouting pressure is determined first, and then the parameters of the anti-permeation trench and the protection hole are determined. Specifically, the grouting pressure can be determined according to the grouting time, location and method of the foundation pit, and the length of the foundation pit site and the depth of the communication pipeline are determined, and then the parameters of the anti-permeation trench and the protection hole are determined.

[0025] For example, when the grouting pressure of the grouting pipe is 0.2Mpa-2Mpa, it is considered that the grouting pressure is small, and the permeation degree is light; and it is confirmed that the length of the foundation pit site is 0.5x10 2 m, and the depth of the communication pipeline is 2m, the width of the anti-permeation trench can be selected to be 0.1m-0.2m, the length is 0.5x10 2 m-1x10 2 m, and the depth is 2m-2.5m. The amount of earthwork of the anti-permeation trench is 20-50m 3 .

[0026] Alternatively, for example, when the grouting pressure of the grouting pipe is 2MPa-4Mpa, it is considered that the grouting pressure is medium, and the permeation degree is medium; and it is confirmed that the length of the foundation pit site is 0.3x10 2 m, and the depth of the communication pipeline is 3m, the width of the anti-permeation trench can be selected to be 0.1m-0.2m, the length is 0.3m-0.8m, and the depth is 3m-3.5m. The amount of earthwork of the anti-permeation trench is 20-50m 3 .

[0027] Further, for example, when the grouting pressure of the grouting pipe is 4MPa-10Mpa, it is considered that the grouting pressure is large, and the permeation degree is serious; and it is confirmed that the length of the foundation pit site is 1x10 2 m, and the depth of the communication pipeline is 2.5m, the width of the anti-permeation trench can be selected to be 0.4m-0.5m, the length is 0.5m-1m, and the depth is 2.5m-3m. The amount of earthwork of the anti-permeation trench is 30-125m 3 .

[0028] Determine the grouting pressure according to the grouting time, location and grouting mode of the foundation pit, and determine the length of the foundation pit site and the depth of the communication pipeline, so as to determine the parameters of the anti-seepage trench and the protection hole. After determining the parameters of the anti-seepage trench and the protection hole, step two is performed.

[0029] Step two: according to the parameters of the anti-seepage trench and the protection hole, a trench and a protection hole are opened on the side of the foundation pit site close to the communication pipeline.

[0030] In one example, the anti-seepage trench and the protection hole are opened on the side of the foundation pit site close to the communication pipeline according to the parameters of the anti-seepage trench and the protection hole, specifically including: a trench and a protection hole are opened on the side of the foundation pit site close to the communication pipeline, and the distance between the anti-seepage trench and the communication pipeline is greater than or equal to 0.2m. By leaving a certain preset distance between the anti-seepage trench and the communication pipeline, even if the cement slurry continues to penetrate to the side of the communication pipeline under the condition of serious cement slurry penetration, it still needs to penetrate through the preset distance to penetrate into the communication pipeline, which facilitates timely measures to prevent the continuous penetration of cement slurry before the cement slurry penetrates into the communication pipeline.

[0031] In one example, the anti-seepage trench is lined with anti-seepage material; the anti-seepage material is lined on the inner side wall of the anti-seepage trench close to the communication pipeline and the bottom wall of the anti-seepage trench.

[0032] By lining the anti-seepage material on the inner side wall of the anti-seepage trench close to the communication pipeline and the bottom wall of the anti-seepage trench, the anti-seepage trench has stronger anti-seepage ability on the side facing the communication pipeline and the bottom, effectively inhibiting the penetration of cement slurry to the side of the communication pipeline during the cement grouting process, thereby further enhancing the anti-seepage effect of the anti-seepage trench. Optionally, when the grouting pressure is greater than or equal to 2MPa, the anti-seepage material is lined on the inner side wall and the bottom wall of the anti-seepage trench close to the communication pipeline, so as to more effectively prevent the penetration of cement slurry into the communication pipeline during the grouting process.

[0033] In one example, the anti-seepage material is a geomembrane or a waterproof roll. Specifically, the anti-seepage material can be an HDPE geomembrane, a composite geomembrane (geotextile, geomembrane, geotextile), or a polypropylene waterproof roll. It should be noted that the specific selection of the anti-seepage material can be adjusted and selected according to actual construction needs, which is not limited here.

[0034] Step three: install a monitoring alarm in the protection hole and start grouting.

[0035] In one example, the length of the protection hole is 0.2m. The width of the protection hole is equal to the width of the anti-infiltration trench, and the depth of the protection hole is equal to the depth of the anti-infiltration trench.

[0036] In one example, a speed bump or a steel plate is arranged above the anti-infiltration trench. Specifically, the height of the speed bump or the steel plate is 0.3cm-1.0cm. By arranging the speed bump or the steel plate above the anti-infiltration trench, the vehicle driving on the excavated road surface is prompted to slow down, and it is ensured that the road surface where the anti-infiltration trench is opened can be normally passed. It should be noted that the specific size of the speed bump or the steel plate can be adjusted according to the actual opening of the anti-infiltration trench and the demand, and the height of the speed bump and the steel plate can also be set accordingly, which is not limited here.

[0037] Step four: start the monitoring alarm to monitor the cement grouting penetration in real time.

[0038] In one example, the monitoring alarm is an infrared grating alarm. The infrared grating alarm has the advantages of anti-interference, waterproof, anti-disassembly, anti-high temperature, anti-low temperature, humidity range, anti-impact, anti-misreporting, anti-light interference, stability, corrosion resistance, detection distance, etc., and is suitable for various engineering matters.

[0039] In one example, the infrared grating alarm includes: a power supply, a grating support, an infrared grating transmitting end, an infrared grating receiving end, a buzzer, a controller, and a communication device. The power supply is connected to the infrared grating transmitting end, the infrared grating receiving end, the buzzer, and the controller through a power line and provides electric energy. The grating support is used to support the infrared grating transmitting end and the infrared grating receiving end. The infrared grating transmitting end and the infrared grating receiving end are connected to the controller through a synchronization line. The infrared grating transmitting end is used to emit infrared light. The infrared grating receiving end is used to receive the infrared light emitted by the infrared grating transmitting end. The buzzer and the communication device are connected to the controller through an alarm signal line. The infrared grating receiving end is also connected to the controller through an alarm signal line. The controller is used to detect whether the infrared light emitted by the infrared grating transmitting end is received by the infrared grating receiving end, and to determine whether to control the buzzer and the communication device to start the alarm according to the detection result. In addition, the power of the infrared grating transmitting end and the receiving end of the infrared grating alarm can be adjusted. The grating support is provided with a rotating mechanism with a maximum rotation of 90°, which facilitates the projection and focusing of the transmitting end and the receiving end in complex construction terrain.

[0040] Specifically, as Figure 2As shown, the infrared grating alarm has a simple connection structure, which is used to monitor the accumulation of cement paste in the anti-seepage trench, that is, the seepage of the cement paste. When the cement paste seeps into the anti-seepage trench and accumulates to a certain height, the accumulated cement paste in the anti-seepage trench will block the infrared light emitted by the transmitting end in the infrared grating alarm, and the receiving end in the infrared grating alarm will not be able to receive the infrared light emitted by the transmitting end. When the receiving end cannot receive the infrared light, the infrared grating alarm immediately alarms, at which time the accumulated cement paste needs to be manually pumped out to avoid further seepage into the communication pipeline. The infrared grating alarm uses infrared, that is, electromagnetic waves with a wavelength of 760 nm to 1 mm, non-visible light with a longer waveform than red light; the infrared grating transmitting end in the infrared grating alarm emits infrared light through the infrared light-emitting diode, and as the current increases, the intensity of the infrared light also increases. The PN junction inside the infrared grating receiving end has infrared light-sensitive characteristics, which belongs to an infrared light-adjustable photosensitive diode. When there is no infrared light, the photosensitive diode does not conduct; when there is infrared light, the photosensitive diode conducts to form a photocurrent, and within a certain range, the current increases with the increase of the intensity of the infrared light.

[0041] The infrared grating transmitting end and the infrared grating receiving end of the infrared grating alarm are connected to the IO interface of the infrared grating alarm; when the transmitting circuit of the infrared grating transmitting end outputs a high level, the light-emitting diode will not emit infrared signals; when the transmitting circuit of the infrared grating transmitting end outputs a low level, the light-emitting diode emits infrared light. When the infrared light-sensitive diode of the infrared grating receiving end receives infrared light, a current is generated, and as the infrared light becomes stronger, the current becomes larger. When there is no infrared light or the infrared light is very weak, the receiving detection pin of the infrared grating receiving end outputs a high level. As the light intensity increases, the current becomes larger, and the pin voltage of the infrared grating receiving end becomes smaller and smaller, and when it becomes small to a certain extent, the receiving detection pin of the infrared grating receiving end becomes a low level. When detecting the infrared signal, the infrared signal will gradually attenuate with the increase of the transmission distance, and if an obstacle is encountered, the infrared light will be blocked. When the infrared grating receiving end does not receive the infrared signal, the photosensitive diode cannot receive the infrared light, and the receiving detection pin of the infrared grating receiving end outputs a high level, which indicates that the obstacle is far away; when the signal is relatively strong, the receiving detection pin of the infrared grating receiving end outputs a low level, which indicates that the obstacle is close.

[0042] In order to meet different needs of different groove width sizes, the infrared rays emitted by the infrared grating alarm can be the same row of double-beam (length 34.5 cm), three-beam (53.5 cm), four-beam (76 cm), six-beam (length 10 cm), eight-beam (length 140 cm), and ten-beam (172 cm). The distance between the infrared grating transmitting end and the infrared grating receiving end is 10-100 m. The infrared grating alarm is made of high-strength aluminum alloy material with a thickness of 1.2 mm. Further, the infrared grating alarm surface is coated with a protective layer, which not only can resist oxidation, but also can effectively cope with the influence of bad weather.

[0043] As shown in Figure 3 , the infrared grating transmitting end has adjustable power in three levels of small, medium and large. The negative pole of the power line DC power supply and the positive pole of the DC power supply 12V are connected to the centralized power supply. The synchronous line is connected to the wired alarm host. The working humidity is-30℃ to +70℃. As shown in Figure 4 , the infrared grating receiving end has adjustable power in three levels of small, medium and large. The negative pole of the power line DC power supply and the positive pole of the DC power supply 12V are connected to the centralized power supply. The synchronous line and the alarm signal line are connected to the wired alarm host. The working humidity is-30℃ to +70℃.

[0044] Specifically, the installation of the buzzer is controlled by the gate switch signal of the communication pipeline together with the front end of the gate of the communication pipeline. The operating state of the buzzer can be continuously turned on or maintained off.

[0045] Step five: if the monitoring alarm starts to alarm, turn off the monitoring alarm and extract the cement mortar in the protection hole.

[0046] In one example, the alarm condition of the infrared grating alarm is that the relative beam is blocked for 1 second. That is, if the infrared rays emitted by the infrared grating transmitting end are blocked and the infrared grating receiving end cannot receive the infrared rays emitted by the transmitting end for 1 second, the infrared grating alarm starts to alarm. It should be noted that the duration of the alarm condition can be adjusted and selected according to the actual construction, which is not limited here.

[0047] In one example, the anti-seepage trench and the protection hole are connected. When the cement slurry penetrates into the anti-seepage trench and accumulates to a certain height, at this time the cement mortar in the anti-seepage trench reaches the upper limit, and further grouting has the risk of cement slurry penetration. The monitoring alarm starts to alarm, the operating personnel turn off the monitoring alarm, and the cement mortar in the protection hole is extracted from the protection hole to prevent the increase of pressure caused by continuous operation from causing cement slurry penetration.

[0048] Step six: if the monitoring alarm does not start to alarm, continue to monitor the cement grouting penetration in real time through the monitoring alarm.

[0049] If the monitoring alarm does not start the alarm, it means that the accumulation of cement slurry in the anti-permeation groove does not reach the preset accumulation amount, and the possibility of cement slurry penetration is small, so the cement grouting can continue.

[0050] Step seven: repeat steps five and six above until the cement grouting is completed.

[0051] Step eight: after the preset time period after the grouting is completed, the monitoring alarm in the protective hole is removed.

[0052] In one example, the preset time period is 7 days. After 7 days after the cement grouting is completed, the cement slurry in the foundation pit has basically solidified, and the cement slurry no longer continues to penetrate or penetrates slowly, which can be ignored, and grouting monitoring is no longer needed.

[0053] Step nine: backfill the anti-permeation groove and the protective hole, and repair the road surface.

[0054] From the perspective of economic benefits, the relocation of communication pipelines requires investment of millions to tens of millions of relocation construction costs, and the cost of repairing communication pipelines is very high; the actual estimated construction and installation engineering cost of the embodiment of the present application is 0.8-2 million yuan, and an investment of about 10,000 yuan can effectively prevent the risk of cement mortar blocking the communication pipeline.

[0055] In the present embodiment, by digging an anti-permeation groove on the side of the communication pipeline, the penetration pressure of the cement slurry during cement grouting is released; the parameters of the anti-permeation groove are determined according to the foundation pit site, the communication pipeline and the grouting method, to ensure that the anti-permeation groove can fit the actual size of the foundation pit, thereby effectively preventing the penetration of cement slurry during cement grouting; and the infrared grating alarm is used to monitor the accumulation of cement slurry in the anti-permeation groove in real time, to prevent and remove excess penetrated cement slurry early, thereby preventing the penetration of cement slurry into the communication pipeline and reducing economic losses.

[0056] The step division of the above method is only for clear description, and in implementation, one step can be combined or some steps can be split and decomposed into multiple steps, as long as the same logical relationship is included, all within the protection scope of the present patent; adding insignificant modifications or introducing insignificant designs in the algorithm or process, but not changing the core design of the algorithm and process, are all within the protection scope of the present patent.

[0057] Those skilled in the art can understand that the above embodiments are specific examples for implementing the present application, and in actual application, various modifications and changes can be made in form and details without departing from the spirit and scope of the present application, and these modifications and changes should all be within the protection scope of the present application.

Claims

1. A method for real-time monitoring of impermeable cement grouting, characterized in that, Comprise: S1, according to the foundation pit site and communication pipeline and grouting mode, determine the parameters of anti-seepage trench and protection hole; According to the length of the foundation pit site, the length of the anti-seepage trench is determined, the depth of the anti-seepage trench and the protection hole is determined according to the depth of the communication pipeline, and the width of the anti-seepage trench and the protection hole is determined according to the maximum grouting pressure of the grouting mode; wherein the length of the anti-seepage trench is greater than or equal to the length of the foundation pit site; the depth of the anti-seepage trench and the protection hole is greater than the depth of the communication pipeline; S2, according to the parameters of the anti-seepage trench and the protection hole, the anti-seepage trench and the protection hole are opened on the side of the foundation pit site close to the communication pipeline; S3, install monitoring alarm in the protection hole and start grouting; S4, start the monitoring alarm, and monitor the cement grouting penetration in real time; S5, if the monitoring alarm starts alarm, turn off the monitoring alarm and pull out the cement mortar in the protection hole; S6, if the monitoring alarm is not started alarm, continue to monitor the cement grouting penetration through the monitoring alarm in real time; S7, repeat the above steps S5~S6 until the cement grouting is completed; S8, after the grouting is completed for a predetermined time, remove the monitoring alarm in the protection hole; S9, backfill the anti-seepage trench and the protection hole, and repair the road surface.

2. The method for real-time monitoring of impermeable cement grouting according to claim 1, characterized in that, The width of the anti-seepage trench is 0.1m~0.2m, or 0.4m~0.5m; the width of the protection hole and the anti-seepage trench is equal.

3. The method of real-time monitoring of impermeable cement grouting according to claim 1, characterized in that, According to the parameters of the anti-seepage trench and the protection hole, the trench and the protection hole are opened, specifically including: The anti-seepage trench is opened in the foundation pit site; the protection hole is opened at both ends of the long side of the anti-seepage trench; The distance between the anti-seepage trench and the communication pipeline is greater than or equal to 0.2m.

4. The method of real-time monitoring of impermeable cement grouting according to claim 1, characterized in that, The length of the protection hole is 0.2m.

5. The method of real-time monitoring of impermeable cement grouting according to claim 1, wherein, The anti-seepage trench is paved with anti-seepage material; The anti-seepage material is paved on the inner side wall of the anti-seepage trench close to the communication pipeline and the bottom wall of the anti-seepage trench.

6. The method of real-time monitoring of impermeable cement grouting according to claim 5, characterized in that, The anti-seepage material is geomembrane or waterproof coiled material.

7. The method of real-time monitoring of impermeable cement grouting according to claim 1, wherein, A speed bump or steel plate is provided above the anti-seepage trench.

8. The method of real-time monitoring of impermeable cement grouting according to claim 1, characterized in that, The monitoring alarm is an infrared grating alarm.

9. The method of real-time monitoring of impermeable cement grouting according to claim 8, characterized in that, The infrared grating alarm includes: power supply, grating support, infrared grating emitting end, infrared grating receiving end, buzzer, controller, communication equipment; The power supply is connected with the infrared grating emitting end, the infrared grating receiving end, the buzzer and the controller through the power supply line and provides electric energy; The grating support is used to support the infrared grating emitting end and the infrared grating receiving end; The infrared grating emitting end and the infrared grating receiving end are connected with the controller through the synchronization line; the infrared grating emitting end is used to emit infrared light; the infrared grating receiving end is used to receive the infrared light emitted by the infrared grating emitting end; The buzzer and the intercom device are connected with the controller through an alarm signal line; the infrared grating receiving end is also connected with the controller through the alarm signal line; The controller is used for detecting whether the infrared light emitted by the infrared grating emitting end is received by the infrared grating receiving end, and judging whether to control the buzzer and the intercom device to start alarm according to the detection result.

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