Water level monitoring, drainage, pressure relief, and anti-floating devices and installation and plugging methods for the central part of underground projects

Abstract

The invention discloses a device for monitoring water level, draining, relieving pressure and resisting floating in the central part of an underground project, and an installation and plugging method. The device comprises a permeable base, a connecting pipe, a first connecting pipe cover, a second connecting pipe cover and an inverted J-shaped guide pipe; the upper end of the permeable base is closed and connected with an upper end plate, a pipe connecting port is provided on the upper end plate, and the lower end of the permeable base is open; there are permeable holes on the side wall of the permeable base; the connecting pipe is provided with a water stop ring at the middle position of a raft plate or a bottom plate, and the upper end of the connecting pipe is connected with the first connecting pipe cover or the inverted J-shaped guide pipe; the second connecting pipe cover is connected to the lower end of the connecting pipe when plugging, the first connecting pipe cover and the second connecting pipe cover are columns, the upper end of the permeable base is connected with the upper end plate, a through-hole connecting port is provided at the center of the upper end plate, and the lower end of the connecting pipe is connected to the connecting port; the device can solve the problem of difficult monitoring of groundwater in the central part of an underground project in the prior art, and at the same time play the role of draining water, relieving pressure and resisting floating.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and relates to a device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and resisting floating, and a method for installing and plugging the device. Background Art

[0002] With the development of my country's economy and construction, there are more and more underground projects. Due to the lack of control measures for groundwater levels in some underground projects, or the lack of monitoring measures for groundwater levels after backfilling around the foundation pit, and the lack of effective and reliable emergency plans in case of sudden heavy rainfall, the groundwater level of underground projects is out of control, and underground project floating accidents occur from time to time. Underground projects are often large in area, and the backfill around the foundation pit has been completed. In addition, during the rainy season, the groundwater level in the foundation pit and the center area of ​​the underground project where floating is most likely to occur cannot be determined. Summary of the invention

[0003] The present invention provides a device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating, as well as an installation and blocking method, which solves the problem in the prior art that groundwater in the central part of an underground project is difficult to monitor, and at the same time plays the role of draining water, relieving pressure and preventing floating.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] On one hand, the present invention provides a device for monitoring water level and draining, relieving pressure and preventing floating in the central part of an underground project, comprising a permeable base (1), a connecting pipe (2), a first connecting pipe cover (3), a second connecting pipe cover (4) and an inverted J-shaped guide pipe (5); the permeable base (1) is cylindrical, the upper end of the permeable base (1) is closed and connected to an upper end plate, the upper end plate is provided with a pipe connection port, and the lower end of the permeable base (1) is open; at least two permeable holes (101) are evenly distributed on the side wall of the permeable base (1); the connecting pipe (2) A water stop ring (201) is arranged at the middle position of the raft plate or the bottom plate (18); the upper end of the connecting pipe (2) is connected to a first connecting pipe cover (3) or an inverted J-shaped flow guide pipe (5); the second connecting pipe cover (4) is connected to the lower end of the connecting pipe (2) when plugging, the first connecting pipe cover (3) and the second connecting pipe cover (4) are columns, the upper end of the permeable base (1) is connected to an upper end plate (102), a through-hole type connecting port (103) is provided at the center of the upper end plate (102), and the lower end of the connecting pipe (2) is connected to the connecting port (103).

[0006] The above-mentioned device for water level monitoring and drainage, pressure relief and anti-floating in the central part of the underground project can also be preferably provided with an internal thread on the inner wall of the connecting pipe (2), and the first connecting pipe cover (3) and the second connecting pipe cover (4) are respectively provided with a first external thread matching and connected to the internal thread on the outer wall; one end of the inverted J-shaped guide pipe (5) is provided with a second external thread matching and connected to the internal thread.

[0007] It is also possible that the internal threads are arranged on the inner walls at both ends of the connecting pipe (2).

[0008] Another aspect of the present invention provides a method for installing the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project as described in one aspect of the present invention, comprising the following steps:

[0009] The first step is to connect the first connecting pipe cover (3) to the upper end of the connecting pipe (2);

[0010] The second step is to dig a pit (7) on the foundation soil (6) and fill the lower part of the pit (7) with stones (8);

[0011] The third step is to place a water-permeable base (1) connected to a connecting pipe (2) for water level monitoring, drainage, pressure relief and anti-floating devices at the center of the underground project at the center of the upper part of the pit, and after the water-permeable base (1) is placed flat and wrapped with a gauze (9), stones (8) are filled around and inside the water-permeable base (1);

[0012] The fourth step is to arrange at least two water level monitoring and drainage, pressure relief and anti-floating devices at the center of the underground project according to the area of ​​the underground project and the spacing between the structural columns; a blind ditch (10) is arranged around each of the devices, and gravels (8) are laid in the blind ditch (10); the blind ditch (10) extends to the outside of the raft or bottom plate (18) of the underground project, and a water collection well (11) is arranged at the end of the blind ditch (10), and gravels (8) are laid in the water collection well (11);

[0013] Step 5: Before pouring the concrete cushion layer (12), geotextiles (13) are laid on the top of all the stones (8). After the concrete cushion layer (12) is poured and reaches the preset strength, cement mortar (14) is used to smooth the surrounding area of ​​the connecting pipe (2) into a downwardly concave arc surface (141), and then the construction of the underground waterproof layer is started; the underground waterproofing membrane (15) is turned up along the arc surface (141) around the connecting pipe (2) to the lower end of the water stop ring (201) of the connecting pipe (2); and a pressure strip seal (16) is set at the waterproof sealing part, and it is sealed with asphalt waterproofing paste (19);

[0014] Step 6: After the construction of the underground waterproof layer is completed, the construction of the waterproof protective layer (17) and the raft or bottom plate (18) begins;

[0015] In the seventh step, after the raft slab or the bottom slab (18) is cast and reaches a preset strength, the first connecting pipe cover (3) is removed and the inverted J-shaped flow guide pipe (5) is connected to the upper end of the connecting pipe (2).

[0016] The installation method of the above underground engineering center water level monitoring and drainage, pressure relief, and anti-floating device can also be preferred, wherein the inner wall of the connecting pipe (2) is provided with an internal thread, and the outer walls of the first connecting pipe cover (3) and the second connecting pipe cover (4) are respectively provided with a first external thread matching and connected to the internal thread; one end of the inverted J-shaped guide pipe (5) is provided with a second external thread matching and connected to the internal thread, and the method includes the following steps:

[0017] In the first step, the first connecting pipe cover (3) is connected to the upper end of the connecting pipe (2) by means of a threaded rotation;

[0018] In the seventh step, after the raft or bottom plate (18) is cast and reaches a preset strength, the first connecting pipe cover (3) is removed by screwing out the thread, and the inverted J-shaped guide pipe (5) is screwed in by screwing in the thread to connect to the upper end of the connecting pipe (2).

[0019] Another aspect of the present invention provides a method for blocking a device for monitoring water level and draining, depressurizing and preventing floating in the center of an underground project as described in one aspect of the present invention, comprising the following steps:

[0020] When there is no groundwater, the inverted J-shaped guide pipe (5) is first removed, and then a first connecting pipe cover (3) is connected to the bottom of the connecting pipe (2), and then asphalt waterproof paste (19) is poured into the connecting pipe (2), and then another first connecting pipe cover (3) is connected to the connecting pipe (2) so that the asphalt waterproof paste (19) fills the gap between the two first connecting pipe covers (3), and then pebble concrete (20) or grouting material (22) is poured into the connecting pipe (2). The strength grade of the pebble concrete (20) or grouting material (22) is greater than the strength grade of the raft or bottom plate (18), and the top surface of the pebble concrete (20) or grouting material (22) and the top surface of the raft or bottom plate (18) are located in the same horizontal plane.

[0021] The above underground engineering center water level monitoring and drainage, pressure relief, anti-floating device blocking method can also be preferably, including the following steps,

[0022] When there is groundwater, if groundwater gushes out during the plugging process, the second connecting pipe cover (4) is first connected to the bottom of the connecting pipe (2), and then asphalt waterproofing paste (19) is poured into the connecting pipe (2), and then the first connecting pipe cover (3) is connected to the connecting pipe (2) so that the asphalt waterproofing paste (19) fills the gap between the first connecting pipe cover (3) and the second connecting pipe cover (4), and then pebble concrete (20) or grouting material (22) is poured into the connecting pipe (2). The strength grade of the pebble concrete (20) or grouting material (22) is greater than the strength grade of the raft or bottom plate (18), and the top surface of the pebble concrete (20) or grouting material (22) and the top surface of the raft or bottom plate (18) are located in the same horizontal plane.

[0023] It is also possible that, preferably, an internal thread is provided on the inner wall of the connecting pipe (2), and a first external thread matching and connected to the internal thread is provided on the outer wall of the first connecting pipe cover (3) and the second connecting pipe cover (4), respectively; a second external thread matching and connected to the internal thread is provided at one end of the inverted J-shaped guide pipe (5), and the method includes the following steps: one first connecting pipe cover (3) is connected to the connecting pipe (2) by rotating the thread; and the other first connecting pipe cover (3) is connected to the connecting pipe (2) by rotating the thread.

[0024] It is also possible that, preferably, an internal thread is provided on the inner wall of the connecting pipe (2), and a first external thread matching and connected to the internal thread is provided on the outer wall of the first connecting pipe cover (3) and the second connecting pipe cover (4), respectively; a second external thread matching and connected to the internal thread is provided at one end of the inverted J-shaped guide pipe (5), and the following steps are included: the second connecting pipe cover (4) is connected to the bottom of the connecting pipe (2) by means of threaded rotation; and a first connecting pipe cover (3) is connected to the connecting pipe (2) by means of threaded rotation.

[0025] It is also possible that the internal threads are arranged on the inner walls of the two ends of the connecting pipe (2), and the steps include:

[0026] The upper end of the third connecting pipe cover (21) is connected to the steel pipe. When there is groundwater, the cylindrical third connecting pipe cover (21) with an external thread on the outer wall is rotatably connected to the bottom of the connecting pipe (2), and the connecting pipe (2) is filled with grouting material (22). The strength grade of the grouting material (22) is greater than the strength grade of the raft or bottom plate (18), and the top surface of the grouting material (22) and the top surface of the raft or bottom plate (18) are located in the same horizontal plane; after the grouting material (22) reaches the preset strength, a wooden wedge (23) is embedded in the connecting pipe (2) to block the groundwater, and then asphalt waterproof paste (19) and grouting material (22) are poured to the lower end of the pipe mouth of the steel pipe, and finally a steel bar head (24) is placed in the pipe mouth of the steel pipe, and the steel bar head (24) is welded to the steel pipe to complete the blocking of the pipe mouth of the steel pipe.

[0027] The present invention can achieve the following beneficial effects:

[0028] The device for monitoring water level, draining, relieving pressure and preventing floating in the center of underground engineering of the present invention and the method for installing and plugging can solve the problem of difficult monitoring of groundwater in the center of underground engineering in the prior art, and at the same time play the role of draining water, relieving pressure and preventing floating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 It is a front view of the permeable base of the device for monitoring the water level in the central part of the underground engineering and for drainage, pressure relief and anti-floating of the device according to the present invention.

[0031] Figure 2 The present invention is a left view of the permeable base of the device for monitoring the water level in the central part of the underground project and for draining, depressurizing and resisting floating.

[0032] Figure 3 The present invention is a top view of the permeable base of the device for monitoring the water level in the central part of the underground project and for drainage, pressure relief and anti-floating.

[0033] Figure 4 It is a front view of the connecting pipe of the device for monitoring the water level in the central part of the underground engineering and for draining, depressurizing and anti-floating of the device according to the present invention.

[0034] Figure 5 It is a left view of the connecting pipe of the device for monitoring the water level in the central part of the underground engineering and for draining, depressurizing and anti-floating of the present invention.

[0035] Figure 6 It is a top view of the connecting pipe of the device for monitoring the water level in the central part of the underground engineering and for drainage, pressure relief and anti-floating of the present invention.

[0036] Figure 7 It is a front view of the first connecting pipe cover of the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and resisting floating of the present invention.

[0037] Figure 8 It is a top view of the first connecting pipe cover of the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and resisting floating of the present invention.

[0038] Fig. 9 It is a structural schematic diagram of the second connecting pipe cover of the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project of the present invention.

[0039] Fig.10It is a structural schematic diagram of an inverted J-shaped guide pipe of the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project of the present invention.

[0040] Fig.11 It is a schematic structural diagram of the device for monitoring the water level in the central part of an underground project and for draining, releasing pressure and preventing floating according to the present invention.

[0041] Fig.12 It is a schematic diagram of the excavation of the installation method of the water level monitoring, drainage, pressure relief and anti-floating device in the central part of the underground engineering of the present invention.

[0042] Fig.13 The present invention is a schematic diagram of the installation method of the water level monitoring, drainage, pressure relief and anti-floating device in the central part of the underground engineering.

[0043] Fig.14 The present invention is a front view of the device and blind ditch arrangement structure of the device for monitoring the water level in the central part of an underground project and the installation method of the device for drainage, pressure relief and anti-floating.

[0044] Fig.15 It is a top view of the device and blind ditch arrangement structure of the device for water level monitoring and drainage, pressure relief and anti-floating in the central part of the underground project of the present invention.

[0045] Fig.16 It is a schematic diagram of waterproof construction of the installation method of the water level monitoring, drainage, pressure relief and anti-floating device in the central part of the underground project of the present invention.

[0046] Fig.17 The present invention is a schematic diagram of the device burying method of the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of the underground project.

[0047] Fig.18 The present invention is a schematic diagram of the device principle of the installation method of the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of the underground engineering.

[0048] Fig.19 It is a schematic diagram of the method for monitoring the water level in the central part of an underground project and sealing the drainage, pressure relief and anti-floating devices of the present invention when there is no water.

[0049] Fig. 20 This is a schematic diagram of the first step of the water blocking method of the underground engineering center water level monitoring and drainage, pressure relief and anti-floating device of the present invention when there is water.

[0050] Fig.21 The second step is a schematic diagram of continuing to screw in the first connecting pipe cover when there is water in the method for sealing the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and resisting floating of the present invention.

[0051] Fig. 22 for Fig.21 The schematic diagram of the method for sealing the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating of the present invention is a schematic diagram of pouring pebble concrete or grouting material during water sealing.

[0052] Fig.23 for Fig.21 The schematic diagram of the structure of the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating of the present invention is shown, wherein the internal threads are arranged on the inner walls at both ends of the connecting pipe.

[0053] Fig.24 for Fig.23 The schematic diagram of the method for sealing the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating of the present invention during waterless sealing is shown.

[0054] Fig.25 for Fig.23 The structure diagram of the third connecting pipe cover of the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and resisting floating of the present invention is shown.

[0055] Fig.26 for Fig.23 The schematic diagram of the method for sealing the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating of the present invention is a schematic diagram of pouring grouting material into the connecting pipe during water sealing.

[0056] Fig. 27 for Fig.26 The schematic diagram of the method for sealing the device for monitoring the water level in the central part of an underground project and for draining, relieving pressure and preventing floating of the present invention is a schematic diagram of embedding a wooden wedge in a connecting pipe during water sealing.

[0057] Fig.28 for Fig.26 The schematic diagram of the method for sealing the device for monitoring the water level and draining, relieving pressure and preventing floating in the central part of an underground project of the present invention is a schematic diagram of putting a steel bar head into the pipe mouth of a cast iron pipe for final sealing during water sealing.

[0058] In the figure, 1 is a permeable base, 2 is a connecting pipe, 3 is a first connecting pipe cover, 4 is a second connecting pipe cover, 5 is an inverted J-shaped guide pipe, 101 is a permeable hole, 18 is a raft or bottom plate, 202 is a water-stop ring, 102 is an upper end plate, 103 is a connection port, 6 is foundation soil, 7 is a pit, 8 is gravel, 9 is a mesh, 10 is a blind ditch, 11 is a water collection well, 12 is a concrete cushion layer, 13 is a geotextile, 14 is cement mortar, 141 is an arc surface, 15 is an underground waterproof membrane, 16 is a layering seal, 17 is a waterproof protective layer, 19 is an asphalt waterproof paste, 20 is a pebble concrete, 21 is a third connecting pipe cover, 22 is a grouting material, 23 is a wooden wedge, and 24 is a steel bar head. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0061] Example 1

[0062] A device for monitoring water level and draining, depressurizing and anti-floating in the center of an underground project, comprising a permeable base 1, a connecting pipe 2, a first connecting pipe cover 3, a second connecting pipe cover 4 and an inverted J-shaped guide pipe 5; see FIGS. 1 and Figure 2 The permeable base 1 is cylindrical, the upper end of the permeable base 1 is closed and connected to an upper end plate, the upper end plate is provided with a pipe connection port, and the lower end of the permeable base 1 is open; at least two permeable holes 101 are evenly distributed on the side wall of the permeable base 1; see Figures 3 to 6 The connecting pipe 2 is provided with a water stop ring 201 at the middle position of the raft or bottom plate 18; Figure 7 and Figure 8 , see Fig. 9 or Fig.10 The upper end of the connecting pipe 2 is connected to the first connecting pipe cover 3 or the inverted J-shaped guide pipe 5; the second connecting pipe cover 4 is connected to the lower end of the connecting pipe 2 when plugging, the first connecting pipe cover 3 and the second connecting pipe cover 4 are columns, the upper end of the permeable base 1 is connected to the upper end plate 102, and a through-hole connecting port 103 is opened at the center of the upper end plate 102, and the lower end of the connecting pipe 2 is connected to the connecting port 103.

[0063] The water level monitoring, drainage, pressure relief and anti-floating device in the central part of the underground engineering of this embodiment is shown in FIG. Fig.11 By burying the device in the foundation soil under the concrete cushion layer, the problem of difficult monitoring of groundwater in the central part of the underground project is solved, and at the same time, it plays a certain role in drainage, pressure relief and anti-floating. The internal thread can be set on the overall inner wall of the connecting pipe 2.

[0064] Example 2

[0065] A device for monitoring water level and draining, relieving pressure and resisting floating in the central part of an underground project, which is similar to Example 1, except that an internal thread is provided on the inner wall of a connecting pipe 2, and a first external thread matching and connected to the internal thread is provided on the outer walls of a first connecting pipe cover 3 and a second connecting pipe cover 4 respectively; and a second external thread matching and connected to the internal thread is provided at one end of an inverted J-shaped guide pipe 5.

[0066] See also Fig.23 Furthermore, the internal threads are arranged on the inner walls at both ends of the connecting pipe 2.

[0067] The water level monitoring, drainage, pressure relief and anti-floating device at the center of the underground project, the cylindrical tube of the permeable base 1, its diameter can be 200mm, and the height can be 250mm. The upper end of the permeable base 1 can be provided with an upper end plate. The pipe connection port opened on the upper end plate can be a circular hole, and its diameter can be 70mm. The lower end of the permeable base 1 can be a hollow structure. The diameter of the permeable hole 101 can be 10mm, and it can be a circular hole. The outer diameter of the mouth of the upper and lower ends of the connecting pipe 2 can be 75mm, the wall thickness can be 2mm, and the height can be consistent with the thickness of the raft or bottom plate 18 for the project. The connecting pipe 2 can be provided with a water stop ring 201 in the middle of the raft or bottom plate 18, the thickness of the water stop ring 201 can be 3mm, the width can be 40mm, and the lower part of the water stop ring 201 can be provided with a groove, the height of the groove can be 20mm, and the depth can be 1mm. The first connecting pipe cover 3 can be a cylinder. When there is no groundwater gushing out, its outer diameter can be 73mm and its height can be 20mm. Its top surface can be provided with a hexagonal groove to facilitate disassembly and assembly with a wrench. The second connecting pipe cover 4 is used when there is groundwater gushing out. If groundwater gushes out during the process of covering the first connecting pipe cover 3, the first connecting pipe cover 3 is difficult to screw in, and a water stop valve needs to be provided on the first connecting pipe cover 3, that is, the second connecting pipe cover 4. The second connecting pipe cover 4 can be a cylinder with an outer diameter of 73mm and a height of 20mm, and a water stop valve can be provided on its top surface. The outer diameter of the inverted J-shaped guide pipe 5 can be 73mm, and one side thereof is provided with an external thread within a range of ≤50mm from the lower opening to match the internal thread of the connecting pipe 1.

[0068] Example 3

[0069] A method for installing a device for monitoring water level and draining, depressurizing, and preventing floating in the center of an underground project as described in Embodiment 1 or Embodiment 2 comprises the following steps:

[0070] The first step is to connect the first connecting pipe cover 3 to the upper end of the connecting pipe 2;

[0071] See also Fig.12 , the second step is to dig a pit 7 on the foundation soil 6 and fill the lower part of the pit 7 with stones 8;

[0072] See also Fig.13 The third step is to place the water level monitoring, drainage, pressure relief and anti-floating devices of the central part of the underground project, and the permeable base 1 connected with the connecting pipe 2 at the center of the upper part of the pit, and after the permeable base 1 is placed flat and wrapped with a gauze 9, stones 8 are filled around and inside the permeable base 1;

[0073] See also Fig.14 and Fig.15 , the fourth step is to arrange at least two water level monitoring and drainage, pressure relief and anti-floating devices in the center of the underground project according to the area of ​​the underground project and the spacing of the structural columns; a blind ditch 10 is arranged around each of the devices, and gravels 8 are laid in the blind ditch 10; the blind ditch 10 extends to the outside of the raft or bottom plate 18 of the underground project, and a water collection well 11 is arranged at the end of the blind ditch 10, and gravels 8 are laid in the water collection well 11;

[0074] See also Figures 16 to 18 , the fifth step, before pouring the concrete cushion layer 12, lay the geotextile 13 on the top of all the stones 8, after the concrete cushion layer 12 is poured and reaches the preset strength, use cement mortar 14 to smooth the surrounding area of ​​the connecting pipe 2 into a downwardly concave arc surface 141, and then start the construction of the underground waterproof layer; turn the underground waterproof membrane 15 up along the arc surface 141 around the connecting pipe 2 to the lower end of the water stop ring 201 of the connecting pipe 2; and set a layering seal 16 at the waterproof sealing part, and seal it with asphalt waterproof paste 19;

[0075] Step 6: After the construction of the underground waterproof layer is completed, the construction of the waterproof protective layer 17 and the raft or bottom plate 18 begins;

[0076] In the seventh step, after the raft or bottom plate 18 is poured and reaches a preset strength, the first connecting pipe cover 3 is removed, and the inverted J-shaped flow guide pipe 5 is connected to the upper end of the connecting pipe 2 .

[0077] Example 4

[0078] A method for installing a device for monitoring water level and draining, depressurizing and anti-floating in the center of an underground project is similar to Example 3, except that it includes the following steps:

[0079] The inner wall of the connecting pipe 2 is provided with an internal thread, and the outer walls of the first connecting pipe cover 3 and the second connecting pipe cover 4 are respectively provided with a first external thread matched with the internal thread; one end of the inverted J-shaped guide pipe 5 is provided with a second external thread matched with the internal thread, and the following steps are included:

[0080] In the first step, the first connecting pipe cover 3 is connected to the upper end of the connecting pipe 2 by screw thread rotation;

[0081] In the seventh step, after the raft or bottom plate 18 is cast and reaches the preset strength, the first connecting pipe cover 3 is removed by screwing out through thread rotation, and the inverted J-shaped guide pipe 5 is screwed in through thread rotation and connected to the upper end of the connecting pipe 2. The water level monitoring and drainage, pressure relief, and anti-floating device in the center of the underground project can start working. As the groundwater level rises, the water level in the device gradually rises. When the water level rises to the height of the inverted J-shaped guide pipe 5, the water will be discharged through the inverted J-shaped guide pipe 5. When the monitoring personnel find that the inverted J-shaped guide pipe 5 is out of water, that is, the groundwater level has risen to the alarm height, and drainage should be organized around the foundation pit. At the same time, this device can also alleviate the buoyancy of groundwater on underground projects to a certain extent, and has certain drainage, pressure relief, and anti-floating effects.

[0082] Example 5

[0083] A method for blocking a device for monitoring water level and draining, depressurizing, and preventing floating in the center of an underground project as described in Example 1 or Example 2, comprising the following steps:

[0084] See also Fig.19 and Fig.24 When there is no groundwater, first remove the inverted J-shaped guide pipe 5, then connect a first connecting pipe cover 3 to the bottom of the connecting pipe 2, then pour asphalt waterproof paste 19 into the connecting pipe 2, and then connect another first connecting pipe cover 3 to the connecting pipe 2, so that the asphalt waterproof paste 19 fills the gap between the two first connecting pipe covers 3, and then pour pebble concrete 20 or grouting material 22 into the connecting pipe 2. The strength grade of the pebble concrete 20 or the grouting material 22 is greater than the strength grade of the raft or bottom plate 18, and the top surface of the pebble concrete 20 or the grouting material 22 and the top surface of the raft or bottom plate 18 are located in the same horizontal plane.

[0085] Example 6

[0086] A method for blocking a device for monitoring water level in the center of an underground project and for drainage, pressure relief, and anti-floating is similar to Example 5, except that it includes the following steps:

[0087] See also Figure 20 to Figure 22 When there is groundwater, if groundwater gushes out during the plugging process, first connect the second connecting pipe cover 4 to the bottom of the connecting pipe 2, then pour asphalt waterproof paste 19 into the connecting pipe 2, and then connect the first connecting pipe cover 3 to the connecting pipe 2, so that the asphalt waterproof paste 19 fills the gap between the first connecting pipe cover 3 and the second connecting pipe cover 4, and then pour pebble concrete 20 or grouting material 22 into the connecting pipe 2. The strength grade of the pebble concrete 20 or the grouting material 22 is greater than the strength grade of the raft or bottom plate 18, and the top surface of the pebble concrete 20 or the grouting material 22 is located in the same horizontal plane as the top surface of the raft or bottom plate 18.

[0088] Furthermore, an internal thread is provided on the inner wall of the connecting pipe 2, and a first external thread matching and connected to the internal thread is provided on the outer wall of the first connecting pipe cover 3 and the second connecting pipe cover 4 respectively; one end of the inverted J-shaped guide pipe 5 is provided with a second external thread matching and connected to the internal thread, and the following steps are included: one first connecting pipe cover 3 is connected to the connecting pipe 2 by rotating the thread; and the other first connecting pipe cover 3 is connected to the connecting pipe 2 by rotating the thread.

[0089] Furthermore, an internal thread is provided on the inner wall of the connecting pipe 2, and a first external thread matching and connected to the internal thread is provided on the outer wall of the first connecting pipe cover 3 and the second connecting pipe cover 4 respectively; a second external thread matching and connected to the internal thread is provided at one end of the inverted J-shaped guide pipe 5, and the following steps are included: the second connecting pipe cover 4 is connected to the bottom of the connecting pipe 2 by rotating the thread; and a first connecting pipe cover 3 is connected to the connecting pipe 2 by rotating the thread.

[0090] Furthermore, the internal threads are arranged on the inner walls of the two ends of the connecting pipe 2, and include the following steps:

[0091] See also Figure 25 to Figure 28 , connect the upper end of the third connecting pipe cover 21 to the steel pipe. When there is groundwater, rotate the cylindrical third connecting pipe cover 21 with external threads on the outer wall to connect it to the bottom of the connecting pipe 2, and pour grouting material 22 into the connecting pipe 2. The strength grade of the grouting material 22 is greater than the strength grade of the raft or bottom plate 18, and the top surface of the grouting material 22 and the top surface of the raft or bottom plate 18 are located in the same horizontal plane; after the grouting material 22 reaches the preset strength, embed a wooden wedge 23 in the connecting pipe 2 to block the groundwater, and then pour asphalt waterproof paste 19 and grouting material 22 to the lower end of the pipe mouth of the steel pipe, and finally put a steel bar head 24 into the pipe mouth of the steel pipe, and weld the steel bar head 24 to the steel pipe to complete the blocking of the pipe mouth of the steel pipe.

[0092] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for installing a device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project, the device comprising a permeable base (1), a connecting pipe (2), a first connecting pipe cover (3), a second connecting pipe cover (4) and an inverted J-shaped guide pipe (5); characterized in that: The permeable base (1) is cylindrical, the upper end of the permeable base (1) is sealed and connected to an upper end plate, the upper end plate is provided with a pipe connection port, and the lower end of the permeable base (1) is open; at least two evenly distributed permeable holes (101) are provided on the side wall of the permeable base (1); a water stop ring (201) is provided on the connecting pipe (2) at the middle position of the raft plate or the bottom plate (18); the upper end of the connecting pipe (2) is connected to a first connecting pipe cover (3) or an inverted J-shaped guide pipe (5); the second connecting pipe cover (4) is connected to the lower end of the connecting pipe (2) when plugging; The first connecting pipe cover (3) and the second connecting pipe cover (4) are cylindrical bodies; the upper end of the permeable base (1) is connected to an upper end plate (102); a through-hole type connecting port (103) is provided at the center of the upper end plate (102); the lower end of the connecting pipe (2) is connected to the connecting port (103); an internal thread is provided on the inner wall of the connecting pipe (2); and first external threads matching and connected to the internal thread are provided on the outer walls of the first connecting pipe cover (3) and the second connecting pipe cover (4); and a hexagonal groove is provided on the top surface of the first connecting pipe cover (3); The installation method comprises the following steps: The first step is to connect the first connecting pipe cover (3) to the upper end of the connecting pipe (2) by means of a threaded rotation; The second step is to dig a pit (7) on the foundation soil (6) and fill the lower part of the pit (7) with stones (8); The third step is to place a permeable base (1) connected to a connecting pipe (2) for water level monitoring and drainage, pressure relief and anti-floating devices at the center of the underground project at the center of the upper part of the pit, and after the permeable base (1) is placed flat and wrapped with a gauze (9), stones (8) are filled around and inside the permeable base (1); The fourth step is to arrange at least two water level monitoring and drainage, pressure relief and anti-floating devices at the center of the underground project according to the area of ​​the underground project and the spacing of the structural columns; a blind ditch (10) is arranged around each of the devices, and gravels (8) are laid in the blind ditch (10); the blind ditch (10) extends to the outside of the raft or bottom plate (18) of the underground project, and a water collection well (11) is arranged at the end of the blind ditch (10), and gravels (8) are laid in the water collection well (11); Step 5: Before pouring the concrete cushion layer (12), a geotextile (13) is laid on the top of all the stones (8); after the concrete cushion layer (12) is poured and reaches a preset strength, cement mortar (14) is used to smooth the area around the connecting pipe (2) into a downwardly concave arc surface (141), and then the construction of the underground waterproof layer is started; the underground waterproofing membrane (15) is turned up along the arc surface (141) around the connecting pipe (2) to the lower end of the water stop ring (201) of the connecting pipe (2); and a pressure strip seal (16) is set at the waterproof sealing part, and it is sealed with asphalt waterproofing paste (19); Step 6: After the construction of the underground waterproof layer is completed, the construction of the waterproof protective layer (17) and the raft or bottom plate (18) begins; In the seventh step, after the raft slab or the bottom slab (18) is cast and reaches a preset strength, the first connecting pipe cover (3) is removed and the inverted J-shaped guide pipe (5) is connected to the upper end of the connecting pipe (2); after the raft slab or the bottom slab (18) is cast and reaches a preset strength, the first connecting pipe cover (3) is removed by screwing out the thread with a wrench, and the inverted J-shaped guide pipe (5) is screwed in the thread and connected to the upper end of the connecting pipe (2).

2. The method for installing the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project as claimed in claim 1, characterized in that: One end of the inverted J-shaped flow guide pipe (5) is provided with a second external thread that matches and connects with the internal thread.

3. The method for installing the device for water level monitoring, drainage, pressure relief and anti-floating in the central part of an underground project as claimed in claim 2, characterized in that: The internal threads are arranged on the inner walls at both ends of the connecting pipe (2).

4. A method for blocking a device for water level monitoring, drainage, pressure relief and anti-floating in the center of an underground project installed by the installation method according to claim 3, characterized in that: The following steps are included: When there is no groundwater, the inverted J-shaped guide pipe (5) is first removed, and then a first connecting pipe cover (3) is connected to the bottom of the connecting pipe (2), and then asphalt waterproof paste (19) is poured into the connecting pipe (2), and then another first connecting pipe cover (3) is connected to the connecting pipe (2) so that the asphalt waterproof paste (19) fills the gap between the two first connecting pipe covers (3), and then pebble concrete (20) or grouting material (22) is poured into the connecting pipe (2), the strength grade of the pebble concrete (20) or grouting material (22) is greater than the strength grade of the raft slab or bottom plate (18), and the top surface of the pebble concrete (20) or grouting material (22) and the top surface of the raft slab or bottom plate (18) are located in the same horizontal plane.

5. A method for blocking a device for water level monitoring, drainage, pressure relief and anti-floating in the center of an underground project installed by the installation method according to claim 3, characterized in that: The following steps are included: When there is groundwater, if groundwater gushes out during the plugging process, the second connecting pipe cover (4) is first connected to the bottom of the connecting pipe (2), and then asphalt waterproofing paste (19) is poured into the connecting pipe (2). Then, the first connecting pipe cover (3) is connected to the connecting pipe (2), so that the asphalt waterproofing paste (19) fills the gap between the first connecting pipe cover (3) and the second connecting pipe cover (4), and then pebble concrete (20) or grouting material (22) is poured into the connecting pipe (2). The strength grade of the pebble concrete (20) or grouting material (22) is greater than the strength grade of the raft slab or the bottom slab (18), and the top surface of the pebble concrete (20) or the grouting material (22) and the top surface of the raft slab or the bottom slab (18) are located in the same horizontal plane.

6. The method for blocking the water level monitoring, drainage, pressure relief and anti-floating device in the central part of an underground project as claimed in claim 5, characterized in that: The following steps are included: The upper end of the third connecting pipe cover (21) is connected to the steel pipe. When there is groundwater, the cylindrical third connecting pipe cover (21) with an external thread on the outer wall is rotatably connected to the bottom of the connecting pipe (2), and the connecting pipe (2) is filled with grouting material (22). The strength grade of the grouting material (22) is greater than the strength grade of the raft or bottom plate (18), and the top surface of the grouting material (22) and the top surface of the raft or bottom plate (18) are located in the same horizontal plane. After the grouting material (22) reaches a preset strength, a wooden wedge (23) is embedded in the connecting pipe (2) to block the groundwater, and then asphalt waterproof paste (19) and the grouting material (22) are poured to the lower end of the pipe mouth of the steel pipe. Finally, a steel bar head (24) is placed in the pipe mouth of the steel pipe, and the steel bar head (24) is welded to the steel pipe to complete the blocking of the pipe mouth of the steel pipe.

Images