A multi-directional water-stop curtain combined water control and subsidence control structure and construction method

Abstract

The present invention relates to the technical field of water-stop curtains, and specifically discloses a multi-directional water-stop curtain combined water control and subsidence control structure and construction method, including a vertical water-stop curtain arranged on the side wall of a foundation pit along a first direction and a horizontal water-stop curtain arranged at the bottom of the foundation pit along a second direction, wherein the first direction is vertically downward, and the second direction is perpendicular to the first direction; the vertical water-stop curtain is a hanging water-stop curtain; the horizontal water-stop curtain is a multi-layer separated structure, including a multi-layer water-stop curtain structure staggeredly arranged inside a deep aquifer. The multi-directional water-stop curtain structure proposed in the present invention includes a combined vertical water-stop curtain and a multi-layer separated horizontal water-stop curtain. The horizontal water-stop curtain of the structure is not completely sealed with the vertical water-stop curtain, and can realize the functions of water isolation, seepage reduction and pressure reduction in the vertical and horizontal directions, effectively slowing down the seepage of groundwater, thereby creating a safer construction environment for the foundation pit.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of water-stop curtains, and in particular to a multi-directional water-stop curtain combined water control and subsidence control structure and a construction method. Background Art

[0002] As my country's urbanization continues to accelerate, urban construction land is becoming increasingly scarce, leading to the emergence of more and more deep foundation pit projects. In the design and construction of deep foundation pits, vertical water-stop curtains are often used to prevent groundwater from flowing into the pit due to precipitation. This prevents ground subsidence outside the pit caused by falling groundwater levels, while also ensuring that the interior of the pit is essentially dry, facilitating construction.

[0003] However, as the excavation depth of the foundation pit becomes deeper and deeper, the cost of installing a vertical water-stop curtain to completely cut off the deep aquifer becomes higher and higher, and the construction difficulty continues to increase and the construction quality is difficult to control. At this time, only installing a vertical water-stop curtain will be difficult to block the flow of groundwater outside the pit into the pit caused by precipitation in the foundation pit, which will cause large-scale subsidence outside the pit when the foundation pit is dewatered, posing a threat to the safety of existing building structures in the city.

[0004] Therefore, it is necessary to propose a new water-stop curtain water control and sinking control technology to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-directional water-stop curtain combined with a water control and subsidence control structure and a construction method, so as to solve the problem raised in the above background technology that as the excavation depth of the foundation pit becomes deeper and deeper, the cost of the vertical water-stop curtain to completely cut off the deep aquifer becomes higher and higher, and the construction difficulty continues to increase, and the construction quality is difficult to control. Moreover, only setting up a vertical water-stop curtain will be difficult to block the flow of groundwater outside the pit into the pit caused by precipitation in the foundation pit, thereby causing large-scale subsidence outside the pit when the foundation pit is dewatered, posing a threat to the safety of existing building structures in the city.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-directional water-stop curtain combined with a water-control and subsidence-control structure comprises a vertical water-stop curtain arranged on the side wall of a foundation pit along a first direction and a horizontal water-stop curtain arranged at the bottom of the foundation pit along a second direction, wherein the first direction is vertically downward and the second direction is perpendicular to the first direction; the vertical water-stop curtain is a suspended water-stop curtain; the horizontal water-stop curtain is a multi-layer separated structure, comprising a multi-layer water-stop curtain structure staggeredly arranged inside a deep aquifer.

[0008] As a further solution of the present invention: the vertical water-stop curtain is arranged in the inner side wall of the foundation pit to form an annular water-stop structure in the foundation pit.

[0009] As a further solution of the present invention: the lower end of the vertical water-stop curtain extends into the deep aquifer, the bottom elevation of the vertical water-stop curtain is lower than the bottom elevation of the foundation pit, and the vertical water-stop curtain is lower than the elevation of the lowest horizontal water-stop curtain, and the vertical water-stop curtain does not completely cut off the aquifer.

[0010] As a further solution of the present invention: the horizontal water-stop curtain is a multi-layer water-stop curtain structure that is horizontally arranged below the bottom of the foundation pit, above the bottom elevation of the vertical water-stop curtain, and located inside a deep aquifer.

[0011] As a further solution of the present invention: the vertical spacing of each layer of horizontal water-stop curtains is no more than one-third of the vertical water-stop curtains exceeding the insertion depth of the bottom of the foundation pit, the arrangement length of the horizontal water-stop curtains along the width of the foundation pit is one-half to two-thirds of the width of the foundation pit, the length is the length of the foundation pit, and the thickness is 500-800mm. A total of no less than four layers of horizontal water-stop curtains are staggered and arranged at the bottom of the foundation pit, and overlapped with the vertical water-stop curtains.

[0012] As a further solution of the present invention: it includes a construction method for a vertical water-stop curtain and a construction method for a separate horizontal water-stop curtain. The construction method of the vertical water-stop curtain is a high-pressure jet grouting method, and the construction method of the horizontal water-stop curtain is an all-round high-pressure rotary jet grouting MJS method.

[0013] As a further solution of the present invention: a construction method of a vertical water-stop curtain comprises the following steps:

[0014] Step 1: Determine the construction location of the vertical water-stop curtain around the foundation pit, measure and lay out the lines, and use cross pile positioning to determine the center position of the bored piles;

[0015] Step 2: Carry out bored pile construction and concrete pouring along the center of the bored pile, and excavate and pour concrete in sequence until all the bored piles are completed;

[0016] Step 3: Carry out jet grouting between two adjacent bored piles and use jet grouting equipment to perform jet grouting. When jet grouting starts, keep the spray rod at the bottom of the hole and rotate continuously. When the slurry containing cement emerges from the hole, spray statically for 2-3 minutes and then lift the jet grouting equipment.

[0017] Step 4: Continue the rotary jet spraying operation in sequence until the construction of the vertical water-stop curtain is completed.

[0018] As a further solution of the present invention: the rotary jet pile construction equipment used in step three is a rotary drilling device, which includes a drill rod and a drill bit. The circumferential side of the drill rod is provided with spiral blades, the drill bit is slidably installed on one end of the drill rod, and a first stirring blade is fixedly installed on the end of the drill rod close to the drill bit. The drill bit is installed with a second stirring blade, and a plurality of slurry nozzles are provided on the conical surface of the drill bit. A slurry channel is provided inside the drill rod, and the slurry channel is connected to the interior of the drill bit. The interior of the drill rod is also provided with an adjustment mechanism for adjusting the distance between the drill bit and the drill rod.

[0019] As a further solution of the present invention: a connecting seat is installed on the drill bit, and the connecting seat is slidably installed inside the drill rod through a guide member. The drill bit is connected to the slurry channel through a connecting pipe, and the connecting pipe is a hose structure; the adjusting mechanism includes an adjusting rod rotatably installed in the side wall of the drill rod and a guide rod fixedly installed in the side wall of the drill rod, the adjusting rod is a threaded rod structure, one side of the guide member is threadedly connected to the adjusting rod, and the other side of the guide member is slidably connected to the guide rod, and the adjusting mechanism also includes a driving motor installed inside the top seat at the upper end of the drill rod, and the driving motor is fixedly connected to the adjusting rod.

[0020] As a further solution of the present invention: the construction method of the horizontal water-stop curtain is: marking the pile positions on the foundation pit facade according to the construction requirements, and installing the blocking device on the foundation pit facade according to the pile positions; installing the MJS construction equipment, and using the high-pressure water jet to cut the in-situ foundation pit soil layer; adjusting the internal pressure of the foundation pit soil layer, and spraying high-pressure cement slurry and air; lifting the spraying, and during the spraying lifting process, opening the mud discharge valve to adjust the balance of the internal pressure of the foundation pit soil layer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The multi-directional water-stop curtain structure proposed in the present invention includes a combined vertical water-stop curtain and a multi-layer separated horizontal water-stop curtain. The horizontal water-stop curtain of this structure is not completely closed with the vertical water-stop curtain, and can realize the functions of water isolation, seepage reduction and pressure reduction in the vertical and horizontal directions, effectively slowing down the seepage of groundwater and reducing the seepage pressure of groundwater at the same time, thereby creating a safer construction environment for the foundation pit. At the same time, the setting of the separated horizontal water-stop curtain can greatly reduce the depth of the vertical water-stop curtain, which saves more materials than the traditional vertical water-stop curtain, thereby reducing material waste and reducing pollution to the environment, achieving rational economic benefits.

[0023] 2. The rotary drilling device used in the construction of the present invention includes a drill rod and a drill bit. The circumferential side of the drill rod is provided with spiral blades. A slurry channel is opened inside the drill rod. An adjustment mechanism for adjusting the distance between the drill bit and the drill rod is also provided inside the drill rod. During the construction of the rotary jet pile, the drill rod and the rotary pile are kept vertical, and the rotary jet pile is excavated using the drill bit. After the rotary jet pile is excavated, slurry is injected into the slurry channel, and the drill rod is raised to move from bottom to top inside the rotary jet pile, so that the rotary jet pile can be supplemented without affecting the movement of the drill rod, thereby improving the pile quality and construction efficiency of the rotary jet pile and saving construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a multi-directional water-stop curtain combined with a water control and subsidence control structure.

[0025] Figure 2 This is a schematic diagram of the structure of a multi-directional water-stop curtain combined with a water and subsidence control structure. Figure 2 .

[0026] Figure 3 This is a flow chart of the construction method of a multi-directional water-stop curtain combined with a water-control and subsidence-control structure.

[0027] Figure 4 This is a schematic diagram of the construction of bored piles and jet grouting piles in the multi-directional water-stop curtain combined with water control and subsidence structure construction method.

[0028] Figure 5 This is a structural diagram of the rotary drilling equipment in the construction method of the multi-directional water-stop curtain combined with water control and subsidence structure.

[0029] Figure 6 This is a cross-sectional view of the rotary drilling equipment used in the construction method of a multi-directional water-stop curtain combined with a water-control and subsidence-control structure.

[0030] In the figure: 10-vertical water-stop curtain, 20-horizontal water-stop curtain, 30-deep aquifer, 40-rotary drilling device, 41-drill rod, 411-adjusting rod, 412-guide rod, 413-connecting pipe, 42-spiral blade, 43-first mixing blade, 44-drill bit, 441-slurry nozzle, 442-connecting seat, 45-top seat, 451-driving motor, 46-second mixing blade, DETAILED DESCRIPTION

[0031] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0033] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are intended to distinguish two non-identical entities or non-identical parameters with the same name. Therefore, "first" and "second" are used for convenience of expression only and should not be understood as limitations on the embodiments of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, other steps or units inherent to a process, method, system, product, or device that includes a series of steps or units.

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0036] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0037] The commonly used water-stop curtain technology at present is the vertical suspended water-stop curtain. However, as the excavation depth of the foundation pit becomes deeper and deeper, the cost of the vertical water-stop curtain to completely cut off the deep aquifer becomes higher and higher, and the construction difficulty continues to increase and the construction quality is difficult to control. At this time, only setting up a vertical water-stop curtain will be difficult to block the flow of groundwater outside the pit into the pit caused by precipitation in the foundation pit, which will cause large-scale subsidence outside the pit when the foundation pit is dewatered, posing a threat to the safety of existing building structures in the city.

[0038] Based on this, see Figure 1-Figure 2 In an embodiment of the present invention, a multi-directional water-stop curtain combined with a water control and sinking control structure comprises a vertical water-stop curtain 10 arranged on the side wall of the foundation pit along a first direction and a horizontal water-stop curtain 20 arranged at the bottom of the foundation pit along a second direction. In the embodiment of the present application, the first direction is vertically downward, and the second direction is perpendicular to the first direction. Figure 1As shown, the vertical water-stop curtain 10 is set in the inner side wall of the foundation pit. Figure 1 The shape of the foundation pit is rectangular, and the vertical water-stop curtain 10 is arranged on the inner side of the side walls around the foundation pit to form a ring-shaped water-stop structure in the foundation pit; the vertical water-stop curtain 10 is a suspended water-stop curtain. When the pit bottom is extremely deep relative to the aquifer or the pit bottom is missing relative to the aquifer, the cost of using a partition water-stop curtain is high and the quality is difficult to guarantee. The bottom-drop water-stop curtain is no longer applicable, and a suspended water-stop curtain is required; the horizontal water-stop curtain 20 is a multi-layer separated structure, including a multi-layer water-stop curtain structure arranged in an interlaced manner inside a deep aquifer 30. It should be noted that the deep aquifer 30 is located at the bottom of the foundation pit, and the horizontal water-stop curtain 20 is set below the bottom of the foundation pit. By arranging horizontal + vertical water-stop structures on the side walls and bottom of the foundation pit, the seepage of groundwater can be effectively slowed down, thereby creating a safer construction environment for the foundation pit.

[0039] Furthermore, in an embodiment of the present application, the lower end of the vertical water-stop curtain 10 extends into the deep aquifer 30, that is, the bottom elevation of the vertical water-stop curtain 10 is lower than the bottom elevation of the foundation pit, and the vertical water-stop curtain 10 is lower than the elevation of the lowest horizontal water-stop curtain 20. The vertical water-stop curtain 10 does not completely cut off the aquifer, and therefore is a suspended water-stop curtain.

[0040] In an embodiment of the present application, the horizontal water-stop curtain 20 is a multi-layer water-stop curtain structure that is horizontally arranged below the bottom of the foundation pit, above the bottom elevation of the vertical water-stop curtain 10, and located inside the deep aquifer 30. The vertical interval between each layer of horizontal water-stop curtain 20 is no more than one-third of the vertical water-stop curtain 10, and the insertion depth exceeds the bottom of the foundation pit. The length of the horizontal water-stop curtain 20 along the width of the foundation pit is one-half to two-thirds of the width of the foundation pit, the length is the length of the foundation pit, and the thickness is 500-800mm. A total of no less than four layers of horizontal water-stop curtains 20 are staggered at the bottom of the foundation pit and overlapped with the vertical water-stop curtain 10.

[0041] In addition, in the embodiment of the present application, the construction of the vertical water-stop curtain 10 adopts a conventional high-pressure jet grouting method, which is a foundation reinforcement method that uses a mixer blade to rotate to mix a curing agent - cement slurry with soft soil;

[0042] The construction of the separated horizontal water-stop curtain 20 adopts the all-round high-pressure rotary jet grouting MJS method. The MJS method is based on the traditional high-pressure jet grouting method, and adopts a unique porous tube and a front-end forced grouting device to realize forced grouting in the hole and ground pressure monitoring. The ground pressure is controlled by adjusting the forced grouting volume, so that deep mud discharge and ground pressure are reasonably controlled, and the ground pressure is stabilized, which reduces the possibility of surface deformation during construction and greatly reduces the impact on the environment. The reduction in ground pressure also further guarantees the pile diameter.

[0043] For further information, see Figure 3 In the embodiment of the present application, a construction method of a multi-directional water-stop curtain combined with a water-control and subsidence-control structure is also disclosed, including a construction method of a vertical water-stop curtain 10 and a construction method of a horizontal water-stop curtain 20. The construction method of the vertical water-stop curtain 10 includes the following steps:

[0044] Step 1: Determine the construction location of the vertical water-stop curtain around the foundation pit, measure and lay out the lines, and use cross pile positioning to determine the center position of the bored piles;

[0045] Step 2: Carry out bored pile construction and concrete pouring along the center of the bored pile, and excavate and pour concrete in sequence until all the bored piles are completed;

[0046] Step 3: Carry out jet grouting between two adjacent bored piles and use the jet grouting equipment to perform jet grouting. When the jet grouting starts, keep the spray rod at the bottom of the hole and rotate continuously. When the slurry with cement emerges from the hole, spray statically for 2-3 minutes and then lift the jet grouting equipment. It should be noted that if Figure 4 As shown, the bored piles and the jet grouting piles are combined to form a bite portion, thereby forming a continuous water-stop curtain through grouting;

[0047] Step 4: Continue the rotary jet spraying operation in sequence until the construction of the vertical water-stop curtain is completed.

[0048] See also Figure 5-Figure 6In the embodiment of the present application, the rotary grouting pile construction equipment used in step three is a rotary drilling device, which includes a drill rod 41 and a drill bit 44. A spiral blade 42 is provided on the circumference of the drill rod 41. The drill bit 44 is slidably mounted on one end of the drill rod 41. A first stirring blade 43 is fixedly mounted on the end of the drill rod 41 close to the drill bit 44. A second stirring blade 46 is mounted on the drill bit 44. A plurality of slurry nozzles 441 are provided on the conical surface of the drill bit 44. A slurry channel is provided inside the drill rod 41, and the slurry channel is connected to the interior of the drill bit 44. The interior of the drill rod 41 is also provided with an adjustment mechanism for adjusting the distance between the drill bit 44 and the drill rod 41. During the rotary grouting pile construction, the drill rod 41 is kept vertical to the rotary pile. The rotary jet pile is excavated using the drill bit 44. After the rotary jet pile is excavated, slurry is injected into the slurry channel, and the drill rod 41 is raised to move the drill rod 41 from bottom to top inside the rotary jet pile. During the movement of the drill rod 41, the slurry inside the slurry channel is injected into the rotary jet pile by the drill bit 44, and the slurry is stirred by the first stirring blade 43 and the second stirring blade 46 to ensure uniform slurry injection. When the rotary jet pile needs to be supplemented due to a fault, the drill rod 41 is kept raised, and the drill bit 44 is adjusted away from the drill rod 41 by the adjustment mechanism so that the drill bit 44 reaches the supplementary spraying position for supplementary spraying. After the supplementary spraying is completed, the drill bit 44 is retracted, so that the rotary jet pile can be supplemented without affecting the movement of the drill rod 41, thereby improving the pile quality and construction efficiency of the rotary jet pile and saving construction time.

[0049] Furthermore, in the embodiment of the present application, a connecting seat 442 is installed on the drill bit 44, and the connecting seat 442 is slidably installed inside the drill rod 41 through a guide. The drill bit 44 is connected to the slurry channel through a connecting pipe 413. The connecting pipe 413 is a hose structure. In this embodiment, the connecting pipe 413 is a bellows.

[0050] Furthermore, the adjustment mechanism includes an adjustment rod 411 rotatably installed in the side wall of the drill rod 41 and a guide rod 412 fixedly installed in the side wall of the drill rod 41. The adjustment rod 411 is a threaded rod structure. One side of the guide is threadedly connected to the adjustment rod 411, and the other side of the guide is slidingly connected to the guide rod 412. The adjustment mechanism also includes a drive motor 451 installed inside the top seat 45 at the upper end of the drill rod 41. The drive motor 451 is fixedly connected to the adjustment rod 411 and is used to drive the adjustment rod 411 to rotate.

[0051] It should be noted that the sinking speed of the drill bit 44 during mixing should be controlled at 0.5m / min, and the lifting speed should be controlled at 0.8-1m / min, and uniform sinking and uniform lifting should be maintained. During the cement-soil mixing pile construction process, if the spraying is stopped due to a fault, supplementary spraying measures should be taken within 12 hours, and the overlapping length of the supplementary spraying should not be less than 1.0m. The construction quality must be strictly controlled in accordance with the design requirements.

[0052] In addition, in an embodiment of the present application, the construction method of the horizontal water-stop curtain 20 is: mark the pile position on the foundation pit facade according to the construction requirements, and install a sealing device on the foundation pit facade according to the pile position; install MJS construction equipment, and use high-pressure water jet to cut the in-situ foundation pit soil layer; adjust the internal pressure of the foundation pit soil layer, and spray high-pressure cement slurry and air; lift the spraying, and during the spraying lifting process, open the mud discharge valve to adjust the balance of the internal pressure of the foundation pit soil layer.

[0053] To sum up, the multi-directional water-stop curtain structure proposed in the present invention includes a combined vertical water-stop curtain and a multi-layer separated horizontal water-stop curtain. The horizontal water-stop curtain of this structure is not completely closed with the vertical water-stop curtain, and can realize the functions of water isolation, seepage reduction and pressure reduction in the vertical and horizontal directions, effectively slowing down the groundwater seepage and reducing the groundwater penetration pressure at the same time, thereby creating a safer construction environment for the foundation pit. At the same time, the setting of the separated horizontal water-stop curtain can greatly reduce the depth of the vertical water-stop curtain, which saves more materials than the traditional vertical water-stop curtain, thereby reducing material waste and reducing pollution to the environment, achieving rational economic benefits. The rotary drilling device used in the construction of the present invention includes a drill rod and a drill bit, the circumference of the drill rod is provided with spiral blades, the interior of the drill rod is provided with a slurry channel, and the interior of the drill rod is also provided with an adjustment mechanism for adjusting the distance between the drill bit and the drill rod. During the construction of the rotary jet pile, the drill rod and the rotary pile are kept vertical, and the rotary jet pile is excavated using the drill bit. After the rotary jet pile is excavated, slurry is injected into the slurry channel, and the drill rod is raised to move from bottom to top inside the rotary jet pile, so that the rotary jet pile can be supplemented with spray without affecting the movement of the drill rod, thereby improving the pile quality and construction efficiency of the rotary jet pile and saving construction time.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0055] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A construction method for a multi-directional water-stop curtain combined with a water-control and subsidence-control structure, characterized in that: The invention comprises a construction method of a vertical water-stop curtain (10) and a construction method of a horizontal water-stop curtain (20), wherein the construction method of the vertical water-stop curtain (10) is a high-pressure jet grouting method, and the construction method of the horizontal water-stop curtain (20) is an all-round high-pressure rotary jet grouting MJS method, wherein the construction method of the vertical water-stop curtain (10) comprises the following steps: Step 1: Determine the construction location of the vertical water-stop curtain around the foundation pit, measure and lay out the lines, and use cross pile positioning to determine the center position of the bored piles; Step 2: Carry out bored pile construction and concrete pouring along the center of the bored pile, and excavate and pour concrete in sequence until all the bored piles are completed; Step 3: Carry out jet grouting between two adjacent bored piles, and use jet grouting equipment to perform jet grouting. When the jet grouting starts, keep the spray rod at the bottom of the hole and rotate continuously. When the slurry with cement emerges from the hole, spray statically for 2-3 minutes and then lift the jet grouting equipment. The jet grouting equipment is a rotary drilling device, which includes a drill rod (41) and a drill bit (44). The drill rod (41) is provided with a spiral blade (42) on its circumference. The drill bit (44) is slidably mounted on the drill rod (41). 1), a first stirring blade (43) is fixedly mounted on one end of a drill rod (41) near a drill bit (44), a second stirring blade (46) is mounted on the drill bit (44), a plurality of slurry nozzles (441) are provided on a conical surface of the drill bit (44), a slurry channel is provided inside the drill rod (41), the slurry channel is communicated with the interior of the drill bit (44), and an adjustment mechanism for adjusting the distance between the drill bit (44) and the drill rod (41) is also provided inside the drill rod (41); The drill bit (44) is provided with a connecting seat (442), the connecting seat (442) is slidably installed in the interior of the drill rod (41) through a guide member, the drill bit (44) is connected to the slurry channel through a connecting pipe (413), and the connecting pipe (413) is a hose structure; the adjusting mechanism comprises an adjusting rod (411) rotatably installed in the side wall of the drill rod (41) and a guide rod (412) fixedly installed in the side wall of the drill rod (41), the adjusting rod (411) is a threaded rod structure, one side of the guide member is threadedly connected to the adjusting rod (411), and the other side of the guide member is slidably connected to the guide rod (412); the adjusting mechanism also comprises a driving motor (451) installed in the interior of the top seat (45) at the upper end of the drill rod (41), and the driving motor (451) is fixedly connected to the adjusting rod (411); Step 4: Continue the rotary jet spraying operation in sequence until the construction of the vertical water-stop curtain is completed.

2. The construction method of the multi-directional water-stop curtain combined with the water control and subsidence control structure according to claim 1 is characterized in that: The construction method of the horizontal water-stop curtain (20) is as follows: marking the pile positions on the foundation pit facade according to the construction requirements, and installing a blocking device on the foundation pit facade according to the pile positions; Install MJS construction equipment and use high-pressure water jets to cut the in-situ foundation pit soil layer; adjust the internal pressure of the foundation pit soil layer and spray high-pressure cement slurry and air; lift the shotcrete, and during the shotcrete lifting process, open the mud discharge valve to adjust the internal pressure balance of the foundation pit soil layer.

3. A multi-directional water-stop curtain combined water-control and subsidence structure formed by the construction method of the multi-directional water-stop curtain combined water-control and subsidence structure according to any one of claims 1-2, characterized in that: The invention comprises a vertical water-stop curtain (10) arranged on the side wall of a foundation pit along a first direction and a horizontal water-stop curtain (20) arranged on the bottom of the foundation pit along a second direction, wherein the first direction is vertically downward and the second direction is perpendicular to the first direction; the vertical water-stop curtain (10) is a hanging water-stop curtain; the horizontal water-stop curtain (20) is a multi-layer separated structure, comprising a multi-layer water-stop curtain structure staggeredly arranged inside a deep aquifer (30).

4. The multi-directional water-stop curtain combined water control and sinking control structure according to claim 3 is characterized in that: The vertical water-stop curtain (10) is arranged in the inner side wall of the foundation pit to form an annular water-stop structure in the foundation pit.

5. The multi-directional water-stop curtain combined water control and sinking control structure according to claim 4 is characterized in that: The lower end of the vertical water-stop curtain (10) extends into the deep aquifer (30), the bottom elevation of the vertical water-stop curtain (10) is lower than the bottom elevation of the foundation pit, and the vertical water-stop curtain (10) is lower than the elevation of the lowest horizontal water-stop curtain (20), and the vertical water-stop curtain (10) does not completely cut off the aquifer.

6. The multi-directional water-stop curtain combined water control and sinking control structure according to claim 3 is characterized in that: The horizontal water-stop curtain (20) is a multi-layer water-stop curtain structure horizontally arranged below the bottom surface of the foundation pit, above the bottom elevation of the vertical water-stop curtain (10), and located inside the deep aquifer (30).

7. The multi-directional water-stop curtain combined water control and sinking control structure according to claim 6 is characterized in that: The vertical spacing of each layer of the horizontal water-stop curtain (20) is no more than one-third of the vertical water-stop curtain (10) exceeding the insertion depth of the bottom surface of the foundation pit. The horizontal water-stop curtain (20) is arranged along the width of the foundation pit with a length of one-half to two-thirds of the width of the foundation pit, a length of the foundation pit, and a thickness of 500-800mm. A total of no less than four layers of horizontal water-stop curtains (20) are arranged in an interlaced manner at the bottom of the foundation pit and overlapped with the vertical water-stop curtain (10).

Images