Plugging method and plugging device for sudden water inrush in deep foundation pits in limestone areas

Abstract

The present invention discloses a plugging method and a plugging device for sudden gushing water in deep foundation pits in limestone areas. The plugging method for sudden gushing water in deep foundation pits in limestone areas includes the following steps: detecting sudden gushing water in the foundation pit; draining the sudden gushing water; drilling the inner and outer sides of the foundation pit support structure at the location of the sudden gushing water to determine the sudden gushing water passage; and plugging the sudden gushing water passage. The plugging method and the plugging device for sudden gushing water in deep foundation pits in limestone areas can reliably and effectively plug the sudden gushing water passage and avoid adverse effects on the foundation pit support structure and surrounding buildings.

Description

Technical Field

[0001] The present invention relates to the technical field of plugging sudden water inrush, and particularly relates to a plugging method and a plugging device for sudden water inrush in deep foundation pits in limestone areas. Background Art

[0002] With the continuous development of the urbanization process, urban rail transit plays an increasingly important role, and the lines sometimes inevitably pass through limestone areas. Due to the existence of many karst caves in limestone areas, coupled with the developed fissures and high groundwater levels in limestone areas, sudden water inrush is likely to occur during the excavation of deep foundation pits for urban rail transit construction in limestone areas. Therefore, it is necessary to promptly plug the sudden water inrush channels to avoid adverse effects on the foundation pit support structure and surrounding buildings (structures). Summary of the Invention

[0003] Based on this, a plugging method and a plugging device for sudden water inrush in deep foundation pits in limestone areas are proposed, which can reliably and effectively plug the sudden water inrush channels and avoid adverse effects on the foundation pit support structure and surrounding buildings.

[0004] The technical solution is as follows:

[0005] On the one hand, a plugging method for sudden water inrush in deep foundation pits in limestone areas is provided, including the following steps: detecting sudden water inrush in the foundation pit; draining the sudden water inrush; drilling the inner and outer sides of the foundation pit support structure at the location of the sudden water inrush to determine the sudden water inrush channel; and plugging the sudden water inrush channel.

[0006] The technical solution is further described below:

[0007] In one embodiment, in the step of draining the sudden water inrush, it includes: inserting a drainage main pipe into the sudden water inrush channel and discharging the sudden water inrush along at least one preset direction by using at least one diversion pipe.

[0008] In one embodiment, after the step of draining the sudden water inrush and before the step of drilling the inner and outer sides of the foundation pit support structure at the location of the sudden water inrush to determine the sudden water inrush channel, it further includes: performing backpressure treatment in a preset area of the sudden water inrush.

[0009] In one embodiment, in the step of drilling the inner and outer sides of the foundation pit support structure at the location of the sudden water inrush to determine the sudden water inrush channel, it includes: drilling to a stable water-resistant layer or intact rock mass; placing a sleeve valve pipe during the drilling process and pouring a detection liquid into the sleeve valve pipe; detecting whether there is pressure during the pouring process and detecting whether there is slurry return on the inner side of the foundation pit support structure. If it is detected that the pressure does not rise slowly and there is slurry return on the inner side of the foundation pit support structure, the sudden water inrush channel can be determined.

[0010] In one embodiment, in the step of pouring the perfusion detection liquid into the sleeve valve pipe, it includes: pouring single grout or pigmented water into the sleeve valve pipe.

[0011] In one embodiment, in the step of blocking the water inrush channel, it includes: pouring a blocking mixture into the water inrush channel.

[0012] The above-mentioned blocking method for water inrush in deep foundation pits in limestone areas has at least the following advantages: (1) It can efficiently and accurately find the water inrush channel, which is convenient for subsequent effective blocking of the water inrush channel; (2) It can reliably and effectively block the water inrush channel, avoiding adverse effects on the foundation pit support structure and surrounding buildings; (3) It can effectively drain the water inrush and apply backpressure to the corresponding area of the water inrush, avoiding scouring damage to the relevant structures in the foundation pit caused by the water inrush.

[0013] On the other hand, a blocking device for water inrush in deep foundation pits in limestone areas is provided, including: a first detection element for detecting whether water inrush occurs in the foundation pit; a drainage assembly for draining the water inrush; a drilling assembly for drilling the inner and outer sides of the foundation pit support structure at the water inrush location to determine the water inrush channel; and a blocking mixture for blocking the water inrush channel.

[0014] When the above-mentioned blocking device for water inrush in deep foundation pits in limestone areas is in use, the first detection element is used to monitor the foundation pit. When water inrush occurs in the foundation pit, it can timely remind the staff to carry out corresponding treatment to avoid adverse effects of the water inrush on the foundation pit support structure and surrounding buildings; after the water inrush occurs, first use the drainage assembly to drain the water inrush to prevent the water inrush from flowing out randomly, thereby causing greater damage to the structure of the entire foundation pit; taking the location where the water inrush occurs as a reference, use the drilling assembly to drill holes on the inner and outer sides of the foundation pit support structure close to this reference to determine the water inrush channel; after confirming the water inrush channel, the water inrush channel can be blocked to avoid adverse effects of the water inrush on the foundation pit support structure and surrounding buildings.

[0015] In one embodiment, the drainage assembly includes a drainage main pipe for inserting into the water inrush channel and a diversion pipe communicated with the drainage main pipe, and the diversion pipe is arranged on the side wall of the drainage main pipe.

[0016] In one embodiment, the blocking device for water inrush in deep foundation pits in limestone areas further includes a backpressure layer for applying backpressure treatment in the preset area of the water inrush.

[0017] In one embodiment, the plugging mixture includes ceramsite and cement slurry. Description of the Drawings

[0018] Figure 1 is a flowchart of a plugging method for sudden gushing water in a deep foundation pit in a limestone area in one embodiment;

[0019] Figure 2 is a flowchart of a plugging method for sudden gushing water in a deep foundation pit in a limestone area in another embodiment;

[0020] Figure 3 is a schematic structural diagram of a plugging device for sudden gushing water in a deep foundation pit in a limestone area in one embodiment;

[0021] Figure 4 is Figure 3 a schematic structural diagram of the plugging mixture of the plugging device for sudden gushing water in a deep foundation pit in a limestone area;

[0022] Figure 5 is Figure 3 a schematic structural diagram of the drainage assembly of the plugging device for sudden gushing water in a deep foundation pit in a limestone area.

[0023] Description of the Reference Numerals:

[0024] 100, foundation pit; 110, preset area; 200, drainage assembly; 210, main drainage pipe; 220, diversion pipe; 310, drill sleeve; 400, plugging mixture; 500, sudden gushing water channel; 1000, support structure. Detailed Embodiments

[0025] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0026] It should be noted that when an element is referred to as being "disposed on", "fixedly disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is referred to as being "fixedly disposed on" another element or "fixedly connected" to another element, the connection between them can be a detachable fixing method or a non-detachable fixing method. When an element is considered to be "connected", "rotatably connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] The terms "first", "second", "third" and the like used in the present invention do not represent specific quantities and orders, but are only used for name distinction.

[0029] As Figure 1 and Figure 2 shown, in one embodiment, a method for plugging sudden gushing water in a deep foundation pit in a limestone area is provided, including the following steps:

[0030] As Figure 1 shown, S100, it is detected that sudden gushing water occurs in the foundation pit 100. Thus, when the problem of sudden gushing water appears in the foundation pit 100, the sudden gushing water can be processed accordingly in time to avoid the further severity or expansion of the sudden gushing water problem.

[0031] Specifically, a first detection element (not shown) is used to monitor the inside of the foundation pit 100. When sudden gushing water occurs in the foundation pit 100, it can timely remind the staff to carry out corresponding processing to avoid the adverse impact of the sudden gushing water on the foundation pit support structure and surrounding buildings. The first detection element can be a camera, a video camera or other elements capable of monitoring the occurrence status of sudden gushing water. Of course, it is also possible to monitor in real time whether sudden gushing water occurs in the foundation pit 100 manually.

[0032] As Figure 1 shown, S200, the sudden gushing water is drained. Thus, after the sudden gushing water occurs, the drainage assembly 200 is first used to drain the sudden gushing water to prevent the sudden gushing water from flowing out randomly, thereby causing greater damage to the structure of the entire foundation pit 100.

[0033] As Figure 2 shown, specifically in this embodiment, in the step of draining the sudden gushing water, it includes: S210, in the step of draining the sudden gushing water, it includes: inserting the drainage main pipe 210 into the sudden gushing water channel 500, and using at least one diversion pipe 220 to drain the sudden gushing water along at least one preset direction. Thus, using the drainage main pipe 210 to draw out the sudden gushing water from the sudden gushing water channel 500 can timely reduce the pressure of the sudden gushing water and avoid the impact damage to the surrounding rock and soil mass caused by excessive pressure; then using the diversion pipe 220 to further drain the sudden gushing water along the preset direction to avoid the random flow of the sudden gushing water, thereby preventing the sudden gushing water from causing scouring damage to the relevant structures in the foundation pit 100.

[0034] As shown Figure 1 in FIG. Figure 1 , drilling treatment is carried out on the inner and outer sides of the foundation pit support structure 1000 at the sudden gushing water point to determine the sudden gushing water channel 500. In this way, taking the part where the sudden gushing water occurs as a reference, drilling is carried out on the inner and outer sides of the foundation pit support structure 1000 close to this reference by using the drilling assembly, so as to determine the sudden gushing water channel 500, which is convenient for accurately plugging the sudden gushing water channel 500 subsequently. The drilling assembly can be a drilling machine, a drilling and grouting machine or other devices capable of drilling. Among them, the inner side of the foundation pit support structure 1000 refers to the inside of the foundation pit 100, and the outer side of the foundation pit support structure 1000 refers to the outside of the foundation pit 100.

[0035] In one embodiment, the drilling assembly includes a drill sleeve 310 and a driving member (not shown) for driving the drill sleeve 310 to drill. In this way, the driving member drives the drill sleeve 310 to drill, which is also convenient for the sleeve valve pipe to be inserted into the drill sleeve 310 subsequently, so that drilling and grouting can be carried out simultaneously. The driving member can be a motor or other elements capable of driving the drill sleeve 310 to drill.

[0036] As shown Figure 2As shown, in one embodiment, in the step of drilling the inner and outer sides of the foundation pit support structure 1000 at the sudden water inrush location to determine the sudden water inrush channel 500, it includes: S410, drilling to a stable water - impermeable layer or intact rock mass. In this way, the drilling assembly is used to drill to a sufficient depth until reaching a stable water - impermeable layer or intact rock mass, so as to accurately search for the sudden water inrush channel 500; during the drilling process, if a karst cave is encountered, drill through the karst cave until reaching an intact rock mass with a certain thickness, and the thickness of the rock mass can be determined according to the actual geological conditions on site. Among them, the drilling range for drilling the inner and outer sides of the foundation pit support structure 1000 can be flexibly adjusted according to the actual situation. S420, install a sleeve valve pipe (not shown) during the drilling process and pour a detection liquid into the sleeve valve pipe. In this way, during the drilling process, the sleeve valve pipe is sleeved into the drill sleeve 310, and the corresponding detection liquid is poured into the sleeve valve pipe, enabling simultaneous drilling and pouring, and then being able to detect in real - time whether the sudden water inrush channel 500 is drilled. S430, detect whether there is pressure during the pouring process and detect whether there is back - slurry on the inner side of the foundation pit support structure 1000. If it is detected that the pressure rises slowly and there is back - slurry on the inner side of the foundation pit support structure 1000, the sudden water inrush channel 500 can be determined. In this way, during the process of pouring the detection liquid, the pressure in the sleeve valve pipe is detected by a pressure detection element. When it is detected that the pressure rises rapidly and there is no back - slurry on the inner side of the foundation pit support structure 1000, it can be judged that the drilling position is outside the sudden water inrush channel 500; when it is detected that the pressure rises slowly and back - slurry is detected on the inner side of the foundation pit support structure 1000, it can be judged that the drilling position is inside the sudden water inrush channel 500, thus being able to confirm the sudden water inrush channel 500. The pressure detection element can be a pressure sensor, a piezometric probe, or other elements capable of detecting liquid pressure. Detecting whether there is back - slurry on the inner side of the foundation pit support structure 1000 can be monitored by elements such as cameras and cameras, or can also be monitored in real - time by manual inspection of whether there is back - slurry.

[0037] Further, in the step of pouring the detection liquid into the sleeve valve pipe, it includes: S421, pour single slurry or pigmented water into the sleeve valve pipe. In this way, after pouring the single slurry or pigmented water into the sleeve valve pipe, it can be timely detected whether there is back - slurry on the inner side of the foundation pit support structure 1000, facilitating the efficient search for the sudden water inrush channel 500.

[0038] As Figure 2As shown, in one embodiment, after the step of draining the sudden gushing water, before the step of drilling the inner and outer sides of the foundation pit support structure 1000 at the sudden gushing water location, it further includes: S300, performing backpressure treatment within the preset area 110 of the sudden gushing water. In this way, the backpressure treatment can prevent the further deterioration of the sudden gushing water danger. For example, if the flow rate or velocity of the sudden gushing water is large, in order to avoid the scouring damage of the rock and soil mass at the sudden gushing water location caused by the gushing of the sudden gushing water, the preset area 110 of the sudden gushing water is subjected to backpressure treatment using a backpressure layer, ensuring that the gushing of the sudden gushing water will not damage the surrounding soil or rock mass and guaranteeing the safety of subsequent construction. The backpressure treatment is carried out within the preset area 110, and this preset area 110 can be flexibly adjusted according to on-site requirements. The greater the flow rate or velocity of the sudden gushing water, the larger the preset area 110. The backpressure layer can be sandbags, a concrete layer, or other objects that can press and combine the rock and soil mass of the foundation pit 100.

[0039] As Figure 1 and Figure 2 shown, S500, performing plugging treatment on the sudden gushing water channel 500. In this way, after the sudden gushing water channel 500 is confirmed, the sudden gushing water channel 500 can be plugged to avoid the adverse impact of the gushing of the sudden gushing water on the foundation pit support structure 1000 and surrounding buildings.

[0040] As Figure 4 shown, specifically, in the step of performing plugging treatment on the sudden gushing water channel 500, it includes: S510, pouring the plugging mixture 400 into the sudden gushing water channel 500. In this way, the plugging mixture 400 is poured into the sudden gushing water channel 500, and the sudden gushing water channel 500 is effectively plugged using the plugging mixture 400. At the same time, the corresponding fissures can also be effectively plugged using the plugging mixture 400, thereby ensuring the safety of the foundation pit 100. The plugging mixture 400 is preferably a mixture of ceramsite and cement slurry, making the structure of the plugging mixture 400 more stable and having a better plugging effect on the sudden gushing water channel 500, and being able to effectively plug the sudden gushing water channel 500 even in the case of large sudden gushing water. Of course, in other embodiments, the ceramsite can also be replaced by plastic particles, and the cement slurry can also be replaced by polyurethane slurry or cement mortar, as long as the mixed plugging mixture 400 can effectively plug the sudden gushing water channel 500.

[0041] The above-mentioned plugging method for water inrush in deep foundation pits in limestone areas has at least the following advantages: (1) It can efficiently and accurately find the water inrush channel 500, facilitating subsequent effective plugging of the water inrush channel 500; (2) It can reliably and effectively plug the water inrush channel 500, avoiding adverse effects on the foundation pit support structure 1000 and surrounding buildings; (3) It can effectively drain the water inrush and apply backpressure to the corresponding area of the water inrush, avoiding scouring damage to the relevant structures within the foundation pit 100 caused by the water inrush.

[0042] As Figures 3 to 5 shown, in one embodiment, a plugging device for water inrush in deep foundation pits in limestone areas is also provided, including: a first detection element (not shown), which is used to detect whether water inrush occurs in the foundation pit 100; a drainage assembly 200, which is used to drain the water inrush; a drilling assembly, which is used to drill the inner and outer sides of the foundation pit support structure 1000 at the water inrush location to determine the water inrush channel 500; and a plugging mixture 400, which is used to plug the water inrush channel 500.

[0043] When the plugging device for water inrush in deep foundation pits in limestone areas of the above-mentioned embodiment is used, the first detection element is used to monitor the inside of the foundation pit 100. When water inrush occurs in the foundation pit 100, it can timely remind the staff to carry out corresponding treatment, avoiding adverse effects on the foundation pit support structure 1000 and surrounding buildings; after the water inrush occurs, first use the drainage assembly 200 to drain the water inrush to prevent the water inrush from flowing out randomly, thereby causing greater damage to the structure of the entire foundation pit 100; taking the location where the water inrush occurs as a reference, use the drilling assembly to drill holes on the inner and outer sides of the foundation pit support structure 1000 close to this reference to determine the water inrush channel 500; after confirming the water inrush channel 500, the water inrush channel 500 can be plugged to avoid adverse effects on the foundation pit support structure 1000 and surrounding buildings caused by the gushing of the water inrush.

[0044] It should be noted that the first detection element can be a camera, a video camera or other elements that can monitor the occurrence status of water inrush. Of course, it is also possible to manually monitor whether water inrush occurs in the foundation pit 100 in real time.

[0045] As Figure 3 And Figure 5As shown, the drainage component 200 is preferably a drainage pipe, which can simply and conveniently drain the gushing water. In one embodiment, the drainage component 200 includes a main drainage pipe 210 for inserting into the gushing water channel 500, and a diversion pipe 220 communicated with the main drainage pipe 210. The diversion pipe 220 is arranged on the side wall of the main drainage pipe 210. In this way, the gushing water is led out of the gushing water channel 500 by the main drainage pipe 210, and the pressure of the gushing water can be reduced in time to avoid the impact damage to the surrounding rock and soil mass caused by excessive pressure. Then, the gushing water is further guided along the preset direction by the diversion pipe 220 to prevent the gushing water from flowing randomly, so as to prevent the gushing water from scouring and damaging the relevant structures in the foundation pit 100.

[0046] In one embodiment, the plugging device for the gushing water in the deep foundation pit in the limestone area further includes an anti-pressure layer (not shown) for performing anti-pressure treatment in the preset area 110 of the gushing water. In this way, if the flow rate or velocity of the gushing water is large, in order to avoid the scouring damage to the rock and soil mass at the gushing water point caused by the gushing of the gushing water, the anti-pressure layer is used to perform anti-pressure treatment in the preset area 110 of the gushing water to ensure that the gushing of the gushing water will not damage the surrounding soil or rock mass and ensure the safety of subsequent construction. The anti-pressure treatment is carried out in the preset area 110, and the preset area 110 can be flexibly adjusted according to the on-site requirements. The greater the flow rate or velocity of the gushing water, the larger the preset area 110. The anti-pressure layer can be sandbags, concrete layers or other objects that can press the rock and soil mass of the foundation pit 100.

[0047] The drilling component can be a drilling machine, a bored pile machine or other devices that can perform drilling. In one embodiment, the drilling component includes a drill sleeve 310 and a driving member for driving the drill sleeve 310 to drill. In this way, the driving member drives the drill sleeve 310 to drill, which is also convenient for the subsequent sleeve valve pipe to be sleeved into the drill sleeve 310, so that drilling and perfusion can be carried out simultaneously. The driving member can be a motor or other elements that can drive the drill sleeve 310 to drill.

[0048] Furthermore, the plugging device for the gushing water in the deep foundation pit in the limestone area further includes a sleeve valve pipe (not shown) sleeved in the drill sleeve 310 for injecting the detection liquid. In this way, during the drilling process, the sleeve valve pipe is sleeved into the drill sleeve 310, and the corresponding detection liquid is injected into the sleeve valve pipe, so that drilling and perfusion can be carried out simultaneously, and then it can be detected in real time whether the gushing water channel 500 is drilled.

[0049] Furthermore, the plugging device for the sudden gushing water in the deep foundation pit in the limestone area further includes a pressure detection element (not shown), and the pressure detection element is used to detect the pressure in the sleeve valve pipe. In this way, during the process of pouring the detection liquid, the pressure in the sleeve valve pipe is detected by using the pressure detection element. When it is detected that the pressure rises rapidly and there is no backflow slurry on the inner side of the foundation pit support structure 1000, it can be judged that the drilling position is outside the sudden gushing water channel 500; when it is detected that the pressure rises slowly and there is a backflow slurry phenomenon detected on the inner side of the foundation pit support structure 1000, it can be judged that the drilling position is inside the sudden gushing water channel 500, so as to confirm the sudden gushing water channel 500. The pressure detection element can be a pressure sensor, a pressure measuring probe or other elements capable of detecting liquid pressure. Detecting whether there is backflow slurry on the inner side of the foundation pit support structure 1000 can be monitored by using elements such as cameras and cameras, or the presence of backflow slurry can be monitored manually in real time.

[0050] The plugging mixture 400 is preferably a mixture of ceramsite and cement slurry, so that the structure of the plugging mixture 400 is more stable, and the plugging effect on the sudden gushing water channel 500 is better, and the sudden gushing water channel 500 can be effectively plugged in the case of large sudden gushing water. Of course, in other embodiments, the ceramsite can also be replaced by plastic particles, and the cement slurry can also be replaced by polyurethane slurry or cement mortar, as long as the formed plugging mixture 400 can effectively plug the sudden gushing water channel 500.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0052] The above embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A plugging method for sudden water inrush in deep foundation pits in limestone areas, characterized in that, It includes the following steps: The gushing water in the foundation pit is detected; The gushing water is drained; The inner and outer sides of the foundation pit support structure at the gushing water location are drilled until a stable water - proof layer or intact rock mass is reached. During the drilling process, a sleeve valve pipe is placed, and a detection liquid is poured into the sleeve valve pipe. Whether there is pressure during the pouring process is detected, and whether there is slurry return on the inner side of the foundation pit support structure is detected. If it is detected that the pressure rises slowly and there is slurry return on the inner side of the foundation pit support structure, the gushing water channel is determined; The gushing water channel is blocked; 2. The plugging method for sudden water inrush in deep foundation pits in limestone areas according to claim 1, characterized in that, In the step of draining the gushing water, it includes: inserting a main drainage pipe into the gushing water channel, and using at least one diversion pipe to drain the gushing water along at least one preset direction.

3. The plugging method for sudden water inrush in deep foundation pits in limestone areas according to claim 1, characterized in that After the step of draining the gushing water and before the step of drilling the inner and outer sides of the foundation pit support structure at the gushing water location, it further includes: performing a back - pressure treatment in the preset area of the gushing water.

4. The plugging method for sudden gushing water in deep foundation pits in limestone areas according to claim 1, characterized in that, In the step of pouring the detection liquid into the sleeve valve pipe, it includes: pouring a single slurry or pigment water into the sleeve valve pipe.

5. The plugging method for sudden water inrush in deep foundation pits in limestone areas according to any one of claims 1 to 4, characterized in that, In the step of blocking the gushing water channel, it includes: pouring a blocking mixture into the gushing water channel.

6. A plugging device for the plugging method of sudden water inrush in deep foundation pits in limestone areas according to any one of claims 1-5, characterized in that, It includes: A first detection element for detecting whether gushing water occurs in the foundation pit; A drainage assembly for draining the gushing water; A drilling assembly for drilling the inner and outer sides of the foundation pit support structure at the gushing water location to determine the gushing water channel; and A blocking mixture for blocking the gushing water channel, the blocking mixture including at least one of ceramsite or plastic pellets, and at least one of polyurethane slurry, cement slurry, and cement mortar; Among them, the drilling assembly includes a drill sleeve and a driving member for driving the drill sleeve to drill, and also includes a sleeve valve pipe sleeved inside the drill sleeve for pouring the detection liquid, and a pressure detection element for detecting the pressure inside the sleeve valve pipe.

7. The plugging device for sudden water inrush in deep foundation pits in limestone areas according to claim 6, characterized in that, The drainage assembly includes a main drainage pipe for inserting into the gushing water channel and a diversion pipe communicated with the main drainage pipe, and the diversion pipe is arranged on the side wall of the main drainage pipe.

8. The plugging device for sudden water inrush in deep foundation pits in limestone areas according to claim 6, characterized in that, It also includes a back - pressure layer for performing a back - pressure treatment in the preset area of the gushing water.

9. The plugging device for sudden water inrush in deep foundation pits in limestone areas according to claim 6, characterized in that, The blocking mixture includes ceramsite and cement slurry.

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