Underground engineering construction water burst early warning method and plugging device

Abstract

The invention relates to the technical field of constructional engineering, in particular to an underground engineering construction water burst early warning method and a plugging device.The early warning method comprises the following steps that the position, located on the periphery of a first plugging point, of the surface of the side wall of a foundation pit is cleaned up, and then a mounting frame is fixedly mounted on the side wall of the foundation pit; the barrel is installed on the installation frame and is adjusted in a sliding mode, so that the barrel is aligned with the first-time plugging point position; and the barrel is moved inwards to be adjusted till the end face abuts against and is attached to the surface of the side wall of the foundation pit, and sealing treatment is conducted so that the first-time plugging point position can be wrapped in the barrel. The barrel is attached to the surface of the side wall of the foundation pit in the mode of surrounding the first-time blocking point position, sealing treatment is conducted, the sealing cover and the barrel are used for forming the cavity wrapping the first-time blocking point position, the monitoring module is used for monitoring the pressure in the cavity, water burst monitoring and early warning are achieved, and the water burst early warning efficiency is improved. Therefore, the water gushing position can be blocked for the second time before the water gushing phenomenon aggravates, and the construction loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and specifically to a method for early warning of water inrush during underground engineering construction and a plugging device. Background Art

[0002] A foundation pit is a common underground project. After the foundation pit is excavated, a concrete side wall is poured inside it, and the lateral pressure resistance of the rigid concrete is used to maintain the stability of the soil mass of the pit wall, prevent collapse, and protect the internal operation environment of the foundation pit. In addition, the concrete side wall can also be used as a permanent part of the underground main structure, combining the functions of construction safety protection and later use. Due to factors such as construction defects in the concrete structure, breakthrough of the groundwater pressure through weak links in the support system, and geological exploration errors, groundwater seeps into the interior of the foundation pit through pores or weak structural parts, forming a water inrush phenomenon.

[0003] In the case of large water inrush water pressure, it is preferred to first bury a drainage pipe to relieve pressure, and simultaneously grout and reinforce the surrounding area and then seal the pipe orifice to plug the water inrush. After the first plugging is completed, it is easy to cause the grouting plugging to fail and form secondary water inrush due to factors such as structural deformation around the water inrush plugging point on the side wall of the foundation pit in a short period of time. In response to how to accurately early warn of secondary water inrush at the first plugging point and how to quickly plug the secondary water inrush, the present invention provides a method for early warning of water inrush during underground engineering construction and a plugging device. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for early warning of water inrush during underground engineering construction and a plugging device to solve the technical problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions.

[0006] A method for early warning of water inrush during underground engineering construction uses the following components: a mounting frame, a cylinder body, a sealing cover, and a monitoring module arranged on the sealing cover. The method specifically includes the following steps:

[0007] Step 1: Clean the surface of the side wall of the foundation pit outside the periphery of the first plugging point, and then firmly install the mounting frame on the side wall of the foundation pit;

[0008] Step 2: Install the cylinder body on the mounting frame and slide and adjust it so that the cylinder body is aligned with the first plugging point;

[0009] Step 3: Move the cylinder body inward for adjustment until the end face abuts and fits against the surface of the side wall of the foundation pit, and perform a sealing treatment to enclose the first plugging point inside;

[0010] Step 4: Install the sealing cover on the end of the cylinder body, and use the monitoring module thereon to monitor and give early warning of water gushing at the first plugging point. When secondary water gushing is detected, use the cylinder body in cooperation with the plugging device to quickly conduct secondary plugging.

[0011] Preferably, the distance between all positions on the inner wall of the cylinder body and the circumferential boundary of the first plugging point is not less than 300 mm.

[0012] Preferably, the mounting frame is composed of vertical plates, horizontal rails, sliding seat A, vertical rails and sliding seat B. The two vertical plates are symmetrically distributed on both sides of the first plugging point on the side wall of the foundation pit. Both ends of the vertical plates are fastened to the surface of the side wall of the foundation pit through anchor bolts. Horizontal rails extending horizontally are fixed between the upper parts and the lower parts of the two vertical plates through connecting arms. Sliding seat A is slidably sleeved on both horizontal rails. Vertical rails extending vertically are respectively fixed on both sides of the two sliding seat A. Sliding seat B is slidably sleeved on both vertical rails. Side plates are respectively fixed on the sides of the two sliding seat B close to each other. An installation cylinder is fixed between the two side plates. The cylinder body is inserted into the installation cylinder in a matching manner.

[0013] Preferably, the distance between each anchor bolt and the circumferential boundary of the first plugging point is not less than 1500 mm.

[0014] Preferably, a side seat is fixed on the outer wall of the cylinder body. An adjusting screw is rotatably installed through the side seat. A threaded hole is provided on the side plate. The adjusting screw is threadedly installed in the threaded hole. By screwing the adjusting screw, the cylinder body can be driven to be adjusted back and forth.

[0015] Preferably, a sleeve is slidably sleeved on the outside of the cylinder body in a matching manner. The end of the adjusting screw is rotatably connected to the end face of the sleeve. The inner diameter of the sleeve shows a trend of increasing away from the adjusting screw. When the end of the cylinder body is adjusted to be in contact with the surface of the side wall of the foundation pit, the end of the sleeve is also in contact with the surface of the side wall of the foundation pit. At the same time, an annular cavity with a triangular cross-section and distributed around the cylinder body is formed between the sleeve and the cylinder body. A material injection pipe A for conveying sealing material into the annular cavity is connected to the sleeve. After the sealing material in the annular cavity is formed, a ring-shaped sealing body is formed to seal between the end face of the cylinder body and the surface of the side wall of the foundation pit.

[0016] Preferably, the monitoring module includes a monitoring cylinder, a piston and a pressure sensor. The sealing cover is detachably threadedly assembled with the end of the cylinder body. The monitoring cylinder is penetratively arranged on the sealing cover. The piston is installed in the monitoring cylinder in a matching manner. A pressure sensor is installed on the monitoring cylinder for monitoring the water pressure in the cylinder body. An annular platform is fixed on the side of the inner wall of the monitoring cylinder away from the sealing cover. A spring is arranged between the annular platform and the piston in the monitoring cylinder. One end of the spring is fixed to the annular platform, and the other end is fixed to the piston. A plurality of pressure relief ports communicating with the outside are evenly distributed in an annular array on the monitoring cylinder.

[0017] The present invention also provides a device for plugging water inrush during underground engineering construction, which includes an inner support cylinder and a drainage pipe. A retaining disk B is coaxially fixed on the side of the inner support cylinder. The drainage pipe is fixedly installed through the retaining disk B and the inner support cylinder. The outer diameter of the retaining disk B is adapted to the inner diameter of the cylinder body, so that the retaining disk B can slide through the cylinder body.

[0018] Preferably, a retaining disk A is fixedly sleeved outside the inner support cylinder. The outer diameter of the retaining disk A is adapted to the inner diameter of the secondary grouting hole. An annular airbag is sleeved between the retaining disk B and the retaining disk A outside the inner support cylinder. The annular airbag inflates and extends outwards. An air filling pipe communicating with the annular airbag is installed through the retaining disk B.

[0019] Preferably, when the inner support cylinder and the drainage pipe are installed into the secondary grouting hole, a support rod is used to support the retaining disk B to be in contact with and fit against the surface of the foundation pit side wall. At this time, a filling cavity that is annular and distributed around the drainage pipe is formed between the retaining disk A, the retaining disk B, the outer peripheral wall of the annular airbag, and the inner wall of the secondary grouting hole. A material injection pipe B for conveying sealing material into the filling cavity is connected to the retaining disk B.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0021] The present invention sets the cylinder body around the first plugging point in a fitting manner on the surface of the foundation pit side wall and performs sealing treatment. A cavity that wraps the first plugging point is formed by the sealing cover and the cylinder body. The pressure in this cavity is monitored by the monitoring module to achieve water inrush monitoring and early warning, so as to perform secondary plugging on the water inrush point in time before the water inrush phenomenon intensifies, thereby reducing construction losses.

[0022] By screwing and adjusting the adjusting screw rod, the present invention can drive the cylinder body and the end of the sleeve to be in contact with and fit against the surface of the foundation pit side wall at the same time, without two adjustments. The sealing material is injected into the annular cavity through the material injection pipe A. The sealing material will fill the annular cavity and flow into the surrounding gaps. After the sealing material is formed, the sealing between the end face of the cylinder body and the surface of the foundation pit side wall is realized. The operation is convenient and fast. In addition, because the sealing material has fluidity, when the flatness between the end face of the cylinder body and the foundation pit side wall and between the end of the sleeve and the foundation pit side wall is low and they cannot be closely fitted, the sealing material can flow into the gaps. After forming, the gaps that cannot be closely fitted can be plugged, improving the sealing effect between the end of the cylinder body and the surface of the foundation pit side wall.

[0023] Through the design that the distance between all positions on the inner wall of the cylinder body and the circumferential boundary of the first plugging point is not less than 300 mm, the present invention extends the monitoring range to form redundant coverage outside the first plugging point, providing safety redundancy for the monitoring range, with a redundancy of not less than 300 mm to cope with the situation where the secondary water inrush point is offset relative to the first water inrush point.

[0024] The present invention uses anchor bolts to fasten the vertical plates to the inner wall of the foundation pit side wall. The vertical plates distributed on both sides of the first plugging point, as well as the connecting arms and cross rails thereon, not only provide a support installation position for the cylinder and other components, but also form a space truss structure to provide traction support for the structure on the foundation pit side wall around the first plugging point, so as to prevent excessive deformation of the foundation pit side wall structure, thereby enabling the first water inrush plugging slurry to solidify and form, while also improving the first plugging effect, achieving two birds with one stone. In addition, the distance between each anchor bolt and the circumferential boundary of the first plugging point is not less than 1500 mm, leaving enough safety distance between the anchor bolt opening and the first plugging point, avoiding the situation that the surrounding structure deforms and displaces due to the anchor bolt implantation near the first plugging point, which may exacerbate the water inrush.

[0025] During the secondary water inrush plugging construction of the present invention, the translation adjustment side of the cylinder on the mounting frame makes space for the opening of the secondary grouting hole. Combining with the positioning function of the cylinder for the retaining plate B, the device can be placed directly without removing the existing early warning components, forming a modular construction layout with structural coordination, significantly shortening the secondary plugging cycle, and continuously monitoring the newly plugged area using the monitoring and early warning method of the first plugging to ensure full-cycle controllability of the water inrush risk, ultimately achieving a double improvement in construction efficiency and safety.

[0026] The present invention utilizes the formation of a packing cavity between the retaining plate A, the retaining plate B, the outer peripheral wall of the annular airbag, and the inner wall of the secondary grouting hole. By injecting sealing material into the packing cavity and inflating the annular airbag, the annular airbag expands and extends outwards, squeezing the sealing material in the packing cavity into the gaps between the retaining plate B and the surface of the foundation pit side wall, between the peripheral wall of the retaining plate A and the inner wall of the secondary grouting hole, and between the peripheral wall of the annular airbag and the inner wall of the secondary grouting hole, realizing a sealed plugging of the end of the secondary grouting hole. Compared with the traditional construction method, it ensures that the port plugging of the secondary grouting hole is faster and the operation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic flow chart of the early warning method of the present invention;

[0028] Figure 2 is a schematic diagram of the overall structure of the components in the early warning method of the present invention;

[0029] Figure 3 is a schematic diagram of the structure of the components arranged on the foundation pit side wall in the early warning method;

[0030] Figure 4 is Figure 2 a partial structure schematic diagram of the structure shown;

[0031] Figure 5 is Figure 3 one of the partial sectional schematic diagrams of the structure shown;

[0032] Figure 6 For Figure 5 the enlarged schematic view of the structure at position A in

[0033] Figure 7 For Figure 5 the enlarged schematic view of the structure at position B in

[0034] Figure 8 For Figure 3 the second partial sectional view of the structure shown in

[0035] Figure 9 the distribution schematic view of the sealing material in the annular cavity in the present invention;

[0036] Figure 10 the structural schematic view of the plugging device in the present invention;

[0037] Figure 11 For Figure 10 the sectional view of the structure shown in

[0038] Figure 12 the schematic view of the plugging device arranged on the side wall of the foundation pit;

[0039] Figure 13 For Figure 12 the partial sectional view of the structure shown in

[0040] Figure 14 the structural schematic view of the packing cavity in the present invention.

[0041] In the figure: 01, side wall of the foundation pit; 02, first plugging point; 03, secondary grouting hole; 04, strut; 1, mounting frame; 11, vertical plate; 12, anchor; 13, connecting arm; 14, cross rail; 15, slide seat A; 151, fastening bolt A; 16, vertical rail; 17, slide seat B; 171, fastening bolt B; 2, cylinder; 201, side seat; 202, adjusting screw; 21, mounting cylinder; 211, side plate; 212, threaded hole; 22, sleeve; 221, injection pipe A; 222, annular cavity; 223, seal; 3, seal cover; 4, monitoring module; 41, monitoring cylinder; 42, piston; 43, pressure sensor; 44, annular platform; 45, spring; 46, pressure relief port; 5, inner support cylinder; 51, retaining disk A; 52, retaining disk B; 53, injection pipe B; 54, packing cavity; 6, drainage pipe; 7, annular airbag; 71, inflation pipe. Specific embodiments

[0042] The embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connection" and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct communication or an indirect communication through an intermediate medium. Among them, "fixing" means connecting to each other and the relative positional relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only with reference to the direction of the attached drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the embodiments of the present invention.

[0044] In the embodiments of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0045] In the embodiments of the present invention, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0046] The reference to "one embodiment" or "some embodiments" etc. described in this specification means that in one or more embodiments of the present invention, specific features, structures or characteristics described in combination with this embodiment are included. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have" and their variants all mean "include but not limited to", unless otherwise specifically emphasized in other ways.

[0047] Please refer to Figures 1-9 , the present invention provides a method for early warning of water inrush during underground engineering construction, which uses the following components: a mounting rack 1, a cylinder 2, a sealing cover 3, and a monitoring module 4 arranged on the sealing cover 3. The specific steps are as follows:

[0048] Step 1: Clean the surface of the foundation pit side wall 01 outside the first plugging point 02, and then firmly install the mounting frame 1 on the foundation pit side wall 01.

[0049] Step 2: Install the cylinder body 2 on the mounting frame 1 and slide and adjust it to align the cylinder body 2 with the first plugging point 02.

[0050] Step 3: Move the cylinder body 2 inward for adjustment until the end face abuts and fits against the surface of the foundation pit side wall 01, and perform sealing treatment to wrap the first plugging point 02 inside.

[0051] Step 4: Install the sealing cover 3 on the end of the cylinder body 2, and use the monitoring module 4 thereon to monitor and give early warning of water gushing at the first plugging point 02. When secondary water gushing is detected, use the cylinder body 2 in cooperation with the plugging device to quickly perform secondary plugging.

[0052] As Figure 2 shown, the mounting frame 1 is composed of vertical plates 11, horizontal rails 14, sliding seats A15, vertical rails 16 and sliding seats B17. The two vertical plates 11 are symmetrically distributed on both sides of the first plugging point 02 on the foundation pit side wall 01. Both ends of the vertical plates 11 are firmly fixed to the surface of the foundation pit side wall 01 through anchor bolts 12. Horizontal rails 14 extending horizontally are fixed between the upper parts and the lower parts of the two vertical plates 11 through connecting arms 13. Sliding seats A15 are slidably sleeved on the two horizontal rails 14. Vertical rails 16 extending vertically are respectively fixed on both sides of the two sliding seats A15. Sliding seats B17 are slidably sleeved on the two vertical rails 16. Side plates 211 are fixed on the sides of the two sliding seats B17 close to each other. An installation cylinder 21 is fixed between the two side plates 211. The cylinder body 2 is inserted into the installation cylinder 21 in a matching manner.

[0053] By sliding and adjusting the sliding seat A15 along the horizontal rail 14, the left-right translation adjustment of the cylinder body 2 can be realized. By sliding and adjusting the sliding seat B17 along the vertical rail 16, the lifting and translation adjustment of the cylinder body 2 can be realized, so as to facilitate the adjustment of the position of the cylinder body 2, make the position of the cylinder body 2 correspond to the position of the first plugging point 02, and wrap the first plugging point 02.

[0054] In addition, both sliding seats A15 are provided with fastening bolts A151, and both sliding seats B17 are provided with fastening bolts B171. After sliding and adjusting the sliding seat A15, tighten the fastening bolt A151 on the sliding seat A15. By using the end of the fastening bolt A151 to abut against the outer wall of the horizontal rail 14, the sliding seat A15 can be locked. After sliding and adjusting the sliding seat B17, tighten the fastening bolt B171 on the sliding seat B17. By using the end of the fastening bolt B171 to abut against the outer wall of the vertical rail 16, the sliding seat B17 can be locked, which helps to maintain the position of the cylinder body 2.

[0055] As Figure 7As shown, a side seat 201 is fixed on the outer wall of the cylinder 2, and an adjusting screw 202 is rotatably installed through the side seat 201. A threaded hole 212 is provided on the side plate 211, and the adjusting screw 202 is installed in the threaded hole 212 with matching threads.

[0056] By pinching the twist handle on the end of the adjusting screw 202 and twisting the adjusting screw 202, the cylinder 2 can be driven to adjust forward and backward under the cooperation of the threaded hole 212 and the thread of the adjusting screw 202, so as to facilitate adjusting the cylinder 2 to a state where the end face contacts and fits with the surface of the foundation pit side wall 01.

[0057] like Figure 8 Figure 9 As shown, a sleeve 22 is provided on the outside of the cylinder 2 to match the sliding sleeve, and the end of the adjusting screw 202 is rotationally connected to the end surface of the sleeve 22, and the inner diameter of the sleeve 22 tends to increase as it is farther away from the adjusting screw 202.

[0058] When the end of the cylinder 2 is adjusted to fit and contact with the surface of the foundation pit side wall 01, the end of the sleeve 22 also fits with the surface of the foundation pit side wall 01. At the same time, an annular cavity 222 with a triangular cross-section and distributed around the cylinder 2 is formed between the sleeve 22 and the cylinder 2. An injection tube A221 for conveying sealing material into the annular cavity 222 is connected to the sleeve 22. After the sealing material in the annular cavity 222 is molded, an annular sealing body 223 is formed to seal between the end face of the cylinder 2 and the surface of the foundation pit side wall 01.

[0059] like Figure 6 As shown, the monitoring module 4 includes a monitoring cylinder 41, a piston 42 and a pressure sensor 43. The sealing cover 3 is detachably threadedly assembled with the end of the cylinder 2. The monitoring cylinder 41 is penetratingly arranged on the sealing cover 3. The piston 42 is matchedly installed in the monitoring cylinder 41. The monitoring cylinder 41 is equipped with a pressure sensor 43 for monitoring the water pressure in the cylinder 2. An annular platform 44 is fixed on the inner wall of the monitoring cylinder 41 on the side away from the sealing cover 3. A spring 45 is provided in the monitoring cylinder 41 between the annular platform 44 and the piston 42. One end of the spring 45 is fixed to the annular platform 44, and the other end is fixed to the piston 42. The monitoring cylinder 41 is evenly distributed with a plurality of pressure relief ports 46 in a ring array and connected to the outside.

[0060] Among them, the specific monitoring and early warning principles of monitoring module 4 are as follows:

[0061] When the cylinder body 2 covers the outside of the first plugging point 02 and is sealed between the end face and the surface of the foundation pit side wall 01, the pressure sensor 43 continuously detects the pressure inside the cylinder body 2 and transmits it to the monitoring room. The processor in the monitoring room processes and analyzes the collected pressure data. When secondary water gushing occurs at the first plugging point 02, water flows into the cylinder body 2 and accumulates. As the accumulated water volume increases, the pressure inside the cylinder body 2 increases. The processor analyzes that the pressure inside the cylinder body 2 continuously increases for a period of time, which means that the water volume inside the cylinder body 2 continuously increases, that is, there is a high possibility of secondary water gushing inside the first plugging point 02. At this time, the control room issues an alarm signal in time to play a warning role before the degree of water gushing worsens, so as to take corresponding measures in time.

[0062] When the pressure inside the cylinder body 2 continuously increases, it will push the piston 42 to move along the inner wall of the monitoring cylinder 41 towards the annular platform 44. At the same time, the spring 45 is compressed and stores energy. During the process of the piston 42 moving towards the annular platform 44, when the piston 42 crosses the pressure relief port 46, the pressure relief port 46 is connected to the inside of the cylinder body 2, and the accumulated water body inside the cylinder body 2 is directly discharged from the pressure relief port 46, achieving the pressure relief effect and avoiding the components from detaching from the foundation pit side wall 01 due to excessive accumulation of water inside the cylinder body 2. After the pressure relief, the pressure inside the cylinder body 2 decreases, and the elastic force of the spring 45 is used to push the piston 42 to slide back to its original position, enabling repeated pressure relief actions.

[0063] The specific warning method provided by the present invention is as follows:

[0064] First, clean the waste left around the first plugging point 02 on the foundation pit side wall 01 due to the plugging of the first water gushing. Use the anchor bolts 12 to fasten the two anchor bolts 12 on the surface of the foundation pit side wall 01 and on both sides of the first plugging point 02 respectively, so as to fix the installation frame 1 on the foundation pit side wall 01. Then, adjust the cylinder body 2 to the position corresponding to the first plugging point 02 through the sliding effects of the sliding seat A15 and the sliding seat B17;

[0065] Next, rotate and adjust the adjusting screw rod 202 to drive the cylinder body 2 to approach the surface of the foundation pit side wall 01 until the end face of the cylinder body 2 abuts and fits against the surface of the foundation pit side wall 01, and the adjusting screw rod 202 pushes the sleeve 22 to slide along the surface of the cylinder body 2, so that the end of the sleeve 22 also abuts and fits against the surface of the foundation pit side wall 01. As Figure 3 shown, at this time, an annular cavity 222 is formed between the outer wall of the sleeve 22 and the cylinder body 2;

[0066] Subsequently, inject the sealing material into the annular cavity 222 through the injection pipe A221. The sealing material will fill the annular cavity 222 and flow into the gaps between the end face of the cylinder body 2 and the surface of the foundation pit side wall 01 and between the end face of the sleeve 22 and the surface of the foundation pit side wall 01. After the sealing material is formed, the seal between the end face of the cylinder body 2 and the surface of the foundation pit side wall 01 is achieved;

[0067] Subsequently, the sealing cover 3 is screwed onto the end of the cylinder body 2, so as to form a cavity between the sealing cover 3 and the cylinder body 2 that wraps the first plugging point 02. The monitoring module 4 is used to monitor the pressure in this cavity to realize the monitoring and early warning of water inrush, so that before the water inrush phenomenon intensifies, the plugging device can be used to plug the water inrush point in time for the second time.

[0068] Since the sealing material has fluidity, when there is a low flatness between the end face of the cylinder body 2 and the side wall 01 of the foundation pit and between the end of the sleeve 22 and the side wall 01 of the foundation pit and they cannot fit tightly, the sealing material can flow into the gap. After forming, the gap that cannot fit tightly can be plugged, improving the sealing effect between the end of the cylinder body 2 and the surface of the side wall 01 of the foundation pit.

[0069] Among them, the distance between all positions between the inner wall of the cylinder body 2 and the circumferential boundary of the first plugging point 02 is not less than 300 mm, so that the monitoring range extends to the periphery of the first plugging point 02 to form redundant coverage, providing safety redundancy for the monitoring range. The redundancy of not less than 300 mm is used to cope with the situation where the second water inrush point is offset relative to the first water inrush point.

[0070] The vertical plate 11 is fastened to the inner wall of the side wall 01 of the foundation pit by using the anchor 12. The vertical plates 11 distributed on both sides of the first plugging point 02 and the connecting arms 13 and the cross rails 14 thereon not only provide a support installation position for the cylinder body 2 and other components, but also form a space truss structure to provide traction support for the structure on the side wall 01 of the foundation pit around the first plugging point 02, so as to prevent the structure of the side wall 01 of the foundation pit from deforming excessively, thereby using the first water inrush plugging slurry to solidify and form, and at the same time improving the first plugging effect, killing two birds with one stone.

[0071] In addition, the distance between each anchor 12 and the circumferential boundary of the first plugging point 02 is not less than 1500 mm, leaving enough safety distance between the opening of the anchor 12 and the first plugging point 02 to avoid the situation that the surrounding structure deforms and displaces due to the anchor 12 being implanted close to the first plugging point 02 during the opening process, which may exacerbate the water inrush.

[0072] Please refer to Figures 1-14 , the present invention also provides an underground engineering construction water inrush plugging device, including an inner support cylinder 5 and a drainage pipe 6. A retaining disc B52 is coaxially fixed on the side of the inner support cylinder 5. The drainage pipe 6 is fixedly installed through the retaining disc B52 and the inner support cylinder 5. The outer diameter of the retaining disc B52 is adapted to the inner diameter of the cylinder body 2, so that the retaining disc B52 can slide through the cylinder body 2.

[0073] Outside the inner support cylinder 5, a retaining disc A51 is fixedly sleeved. The outer diameter of the retaining disc A51 is adapted to the inner diameter of the secondary grouting hole 03. An annular airbag 7 is sleeved between the retaining disc B52 and the retaining disc A51 on the outside of the inner support cylinder 5. The annular airbag 7 is inflated and extends outwardly. A gas injection pipe 71 communicating with the annular airbag 7 is installed through the retaining disc B52.

[0074] When the inner support cylinder 5 and the drainage pipe 6 are inserted into the secondary grouting hole 03, the retaining disc B52 is supported by the supporting rod 04 to be in contact with and fit against the surface of the foundation pit side wall 01. At this time, an annular packing cavity 54 that surrounds the drainage pipe 6 is formed between the retaining disc A51, the retaining disc B52, the outer peripheral wall of the annular airbag 7, and the inner wall of the secondary grouting hole 03. A material injection pipe B53 for conveying the sealing material into the packing cavity 54 is connected to the retaining disc B52. Among them, the outer diameter of the retaining disc B52 is larger than the outer diameter of the retaining disc A51.

[0075] When the above warning method monitors and warns that secondary water inrush occurs at the first plugging point 02, the staff can quickly perform secondary plugging using this plugging device. The specific operation steps are as follows:

[0076] First, unscrew and remove the sealing cover 3 from the cylinder body 2. Then, by reversely screwing the adjusting screw rod 202, drive the cylinder body 2 and the sleeve 22 to move simultaneously to the side away from the foundation pit side wall 01. Under the continuous driving action of the adjusting screw rod 202, the cylinder body 2 and the sleeve 22 can be pulled away from the surface of the foundation pit side wall 01 to cancel the seal between the end of the cylinder body 2 and the foundation pit side wall 01.

[0077] Next, slide and translate the cylinder body 2 to one side to make room at the first plugging point 02, and open a hole according to the actual position of the secondary water inrush to obtain the secondary grouting hole 03. Then, translate and adjust the cylinder body 2 to the position corresponding to the secondary grouting hole 03 and ensure that the end face of the cylinder body 2 fits against the surface of the foundation pit side wall 01 again.

[0078] Next, after inserting the inner support cylinder 5 and the drainage pipe 6 into the cylinder body 2 and then placing them into the secondary grouting hole 03, use the supporting rod 04 on the external support to press against the retaining disc B52 to fit against the outer surface of the foundation pit side wall 01. At this time, the retaining disc A51 fits against the inner wall of the secondary grouting hole 03, and the retaining disc B52 meshes with the inner wall of the cylinder body 2. As Figure 12 shown, part of the water body in the secondary grouting hole 03 is drained through the drainage pipe 6, and part is drained through the gap between the retaining disc B52 and the foundation pit side wall 01.

[0079] Subsequently, sealing material is injected into the packing cavity 54 through the injection pipe B53. After that, the annular airbag 7 is inflated by the air charging pipe 71. When the annular airbag 7 is inflated, it expands and extends outwards, and the sealing material in the packing cavity 54 can be squeezed into the gaps between the retaining disc B52 and the surface of the foundation pit side wall 01, between the peripheral wall of the retaining disc A51 and the inner wall of the secondary grouting hole 03, and between the peripheral wall of the annular airbag 7 and the inner wall of the secondary grouting hole 03, so as to achieve a sealed plugging of the end of the secondary grouting hole 03, ensuring that the water gushing in the secondary grouting hole 03 can only be drained out through the drainage pipe 6;

[0080] After the water pressure in the secondary grouting hole 03 decreases to the construction requirement and stabilizes, the plugging slurry is injected into the secondary grouting hole 03 through the drainage pipe 6. When the slurry fills the secondary grouting hole 03, the drainage pipe 6 is plugged. The plugging slurry flows into each water gushing gap. After forming, the water gushing gaps and the secondary grouting hole 03 can be plugged to achieve the plugging of the secondary water gushing.

[0081] When opening the secondary water gushing point, through the translation adjustment ability of the cylinder body 2 on the mounting frame 1, the cylinder body 2 is adjusted to the side to make space for opening the secondary grouting hole 03. When the plugging device is placed into the secondary grouting hole 03, the retaining disc B52 is located inside the cylinder body 2, and the cylinder body 2 is used to position the retaining disc B52. The plugging device is used in cooperation with the warning component, so that it is not necessary to remove the warning component. The collaborative structural layout effectively improves the construction efficiency of the secondary plugging. In addition, referring to the water gushing monitoring and warning method after the primary plugging, the secondary plugging part can be continuously warned until the water gushing part is completely plugged. Finally, the mounting frame 1 and the cylinder body 2 as a whole can be removed from the foundation pit side wall 01.

[0082] In addition, it is worth noting that the sealing material and the plugging slurry in this application both adopt the materials in the prior art and will not be detailedly disclosed in this application.

[0083] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

Claims

1. A method for early warning of water inrush during underground engineering construction, characterized in that: The following components are used: a mounting frame (1), a cylinder (2), a sealing cover (3), and a monitoring module (4) arranged on the sealing cover (3); Specifically, it includes the following steps: Step 1: Clean the surface of the foundation pit side wall (01) around the first plugging point (02), and then firmly install the mounting frame (1) on the foundation pit side wall (01); Step 2: Install the cylinder (2) on the mounting frame (1) and slide and adjust it so that the cylinder (2) is aligned with the first plugging point (02); Step 3: Move the cylinder (2) inward and adjust it until the end face abuts and fits with the surface of the foundation pit side wall (01), and perform sealing treatment to wrap the first plugging point (02) inside; Step 4: Install the sealing cover (3) on the end of the cylinder (2), and use the monitoring module (4) thereon to monitor and give an early warning of water inrush at the first plugging point (02). When secondary water inrush is detected, use the cylinder (2) to cooperate with the plugging device to quickly perform secondary plugging.

2. The method for early warning of water inrush during underground engineering construction according to claim 1, characterized in that: The distance between all positions between the inner wall of the cylinder (2) and the circumferential boundary of the first plugging point (02) is not less than 300 mm.

3. The method for early warning of water inrush during underground engineering construction according to claim 1, characterized in that: The mounting frame (1) is composed of vertical plates (11), horizontal rails (14), sliding seats A (15), vertical rails (16), and sliding seats B (17). The two vertical plates (11) are symmetrically distributed on both sides of the first plugging point (02) on the foundation pit side wall (01), and both ends of the vertical plates (11) are firmly fixed to the surface of the foundation pit side wall (01) through anchor bolts (12); Horizontal rails (14) extending horizontally are fixed between the upper and lower parts of the two vertical plates (11) through connecting arms (13), and sliding seats A (15) are slidably sleeved on both horizontal rails (14); Vertical rails (16) extending vertically are respectively fixed on both sides of the two sliding seats A (15), and sliding seats B (17) are slidably sleeved on both vertical rails (16); Side plates (211) are respectively fixed on the sides of the two sliding seats B (17) close to each other, and an installation cylinder (21) is fixed between the two side plates (211), and the cylinder (2) is inserted and matched in the installation cylinder (21).

4. The method for early warning of water inrush during underground engineering construction according to claim 3, characterized in that: The distance between each anchor bolt (12) and the circumferential boundary of the first plugging point (02) is not less than 1500 mm.

5. The method for early warning of water inrush during underground engineering construction according to claim 3, characterized in that: A side seat (201) is fixed on the outer wall of the cylinder (2), and an adjusting screw (202) is rotatably installed through the side seat (201); A threaded hole (212) is provided on the side plate (211), and the adjusting screw (202) is threadedly installed in the threaded hole (212); By rotating the adjusting screw (202), the barrel (2) can be driven to be adjusted forward and backward.

6. The underground engineering construction water inrush early warning method according to claim 5, characterized in that: The outer portion of the cylinder (2) is provided with a sleeve (22) for matching the sliding sleeve, and the end of the adjusting screw (202) is rotatably connected to the end surface of the sleeve (22); The inner diameter of the sleeve (22) increases as it moves away from the adjusting screw (202); When the end of the cylinder (2) is adjusted to fit and contact the surface of the foundation pit side wall (01), the end of the sleeve (22) also fits the surface of the foundation pit side wall (01), and at the same time, an annular cavity (222) with a triangular cross-section and distributed around the cylinder (2) is formed between the sleeve (22) and the cylinder (2); The sleeve (22) is connected to an injection pipe A (221) for conveying sealing material into the annular cavity (222); After the sealing material in the annular cavity (222) is molded, an annular sealing body (223) is formed to seal between the end surface of the cylinder (2) and the surface of the foundation pit side wall (01).

7. The underground engineering construction water inrush early warning method according to claim 1, characterized in that: The monitoring module (4) comprises a monitoring cylinder (41), a piston (42) and a pressure sensor (43); The sealing cover (3) is detachably threadedly assembled with the end of the cylinder (2); The monitoring cylinder (41) is disposed on the sealing cover (3) in a penetrating manner, and the piston (42) is installed in the monitoring cylinder (41) in a matching manner; The pressure sensor (43) is installed on the monitoring cylinder (41) and is used to monitor the water pressure in the cylinder (2); An annular platform (44) is fixed on the inner wall of the monitoring tube (41) at a side away from the sealing cover (3); a spring (45) is provided in the monitoring tube (41) between the annular platform (44) and the piston (42); one end of the spring (45) is fixed to the annular platform (44), and the other end is fixed to the piston (42); The monitoring tube (41) is provided with a plurality of pressure relief ports (46) uniformly distributed in an annular array and communicating with the outside.

8. An underground engineering construction water inrush blocking device, applied to the underground engineering construction water inrush early warning method according to claim 1, characterized in that: It comprises an inner support tube (5) and a drainage tube (6); A baffle plate B (52) is coaxially fixed to the side of the inner support tube (5), and the drainage tube (6) is fixed through the baffle plate B (52) and the inner support tube (5); The outer diameter of the baffle plate B (52) is matched with the inner diameter of the cylinder (2), so that the baffle plate B (52) can slide inside the cylinder (2).

9. The underground engineering construction water inrush blocking device according to claim 8, characterized in that: The inner support tube (5) is fixedly sleeved with a baffle A (51) on the outside, and the outer diameter of the baffle A (51) is adapted to the inner diameter of the secondary grouting hole (03); An annular airbag (7) is mounted outside the inner support tube (5) and between the baffle plate B (52) and the baffle plate A (51). The annular airbag (7) is inflated and expands toward the periphery; An inflation tube (71) communicating with the annular airbag (7) is installed through the baffle plate B (52).

10. The underground engineering construction water gushing blocking device according to claim 9, characterized in that: When the inner support tube (5) and the drainage tube (6) are installed into the secondary grouting hole (03), the support rod (04) is used to support the baffle plate B (52) to contact and fit with the surface of the foundation pit side wall (01). At this time, an annular filling cavity (54) is formed between the baffle plate A (51), the baffle plate B (52), the outer peripheral wall of the annular air bag (7) and the inner wall of the secondary grouting hole (03) and is distributed around the drainage tube (6); The baffle plate B (52) is connected to a material injection pipe B (53) for conveying sealing material into the filling cavity (54).

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