A method for controlling groundwater using a gas barrier and an injection device thereof

Abstract

This application discloses a method for controlling groundwater using a gas barrier and its injection device, relating to the technical field of cast-in-place pile construction. The method for controlling groundwater using a gas barrier includes the following steps: S1. Arranging multiple small-diameter injection pipes around the area where groundwater needs to be controlled, each of the injection pipes having multiple injection holes on its side wall, a filter ring fixed to the outer wall of each injection pipe, and a spike fixed to the bottom of each injection pipe; S2. Using an injection device to inject inert gas into the ground through the injection pipes; S3. Controlling the injection pressure and flow rate to continuously inject and form a stable gas barrier; S4. Using a formation detection instrument to monitor the distribution of soil gas concentration, monitor the formation of the gas barrier, and adjust the injection parameters; S5. Performing post-maintenance after the gas barrier is formed to control the groundwater level. This application can effectively lower the groundwater level around the pile hole.

Description

Technical Field

[0001] The present application relates to the technical field of bored pile construction, and in particular to a method for controlling groundwater using a gas barrier and an injection device thereof. Background Art

[0002] At present, cast-in-place pile construction often requires groundwater treatment. If the groundwater level is high or the water pressure is large, the pile body slurry may become unstable and even cause the pile hole to collapse.

[0003] The traditional method is to pump water from deep wells to lower the groundwater level, but this method is not very effective. Summary of the Invention

[0004] This application provides a method for controlling groundwater using a gas barrier, which can effectively lower the groundwater level around the pile hole, using the following technical solutions:

[0005] A method for controlling groundwater using a gas barrier comprises the following steps:

[0006] S1. Multiple small-diameter injection pipes are deployed around the area where groundwater needs to be controlled. Each injection pipe has multiple injection holes on its sidewall. A filter ring is fixed to the outer wall of each injection pipe, and a spike portion is fixed to the bottom of each injection pipe.

[0007] S2. Injecting an inert gas into the ground through the injection pipe using an injection device;

[0008] S3. Control the injection pressure and flow rate, and continuously inject to form a stable gas barrier;

[0009] S4. Use formation detection instruments to monitor soil gas concentration distribution, monitor the formation of gas barriers, and adjust injection parameters;

[0010] S5. Carry out post-maintenance after the gas barrier is formed to control the groundwater level.

[0011] By adopting the above solution, the gas barrier provided can effectively lower the groundwater level around the pile hole.

[0012] Preferably, the inert gas is nitrogen.

[0013] By adopting the above solution, nitrogen is an inert gas commonly used in industry, with large production scale and relatively low unit price, so the use of nitrogen can reduce costs.

[0014] This application provides a gas injection device for controlling groundwater using a gas barrier, which adopts the following technical solutions:

[0015] A gas injection device for controlling groundwater using a gas barrier comprises an annular pipe, a plurality of vertical pipes connected to the bottom of the annular pipe, an intermediate pipe connected to the annular pipe, a connecting pipe connected to the intermediate pipe, and a quick connector mounted on an end of the connecting pipe remote from the intermediate pipe; the tops of the plurality of injection pipes are threadedly connected one-to-one to the inner sidewalls of the bottoms of the plurality of vertical pipes, each of the vertical pipes being mounted with a pressure gauge; the connecting pipes are mounted with a flow meter and an electric regulating valve; and the end of the connecting pipe remote from the intermediate pipe is connected to a nitrogen supply pipe via a quick connector.

[0016] By adopting the above solution, when it is necessary to supply gas to the injection pipe, the nitrogen supply pipe and the connecting pipe are first connected through the electric regulating valve, and then the nitrogen passes through the intermediate pipe, the annular pipe and the vertical pipe in sequence and enters the injection pipe, so that the injection pipe can be supplied with gas; the pressure gauge and flow meter are provided to facilitate the observation of flow and pressure.

[0017] Preferably, the outer side wall of the bottom of each vertical tube is connected with a pressure ring.

[0018] By adopting the above solution and providing a pressure ring, the possibility of nitrogen escaping from the connection between the injection pipe and the ground can be reduced.

[0019] Preferably, multiple sets of lifting devices are installed on the annular tube.

[0020] By adopting the above solution, the provided lifting device facilitates the lifting of the annular pipe, thereby facilitating the removal of the injection device and the injection pipe.

[0021] Preferably, each group of the lifting devices includes a connecting rod fixed to the outer wall of the annular tube, a baffle fixed to the top of the connecting rod, and a first spring sleeved on the connecting rod; a sliding sleeve is slidably connected to the connecting rod, and the two ends of the first spring are respectively fixed to the opposite inner sides of the sliding sleeve and the baffle; a hanger is fixed to the top of the sliding sleeve, and a lifting ring is fixed to the top of the hanger.

[0022] By adopting the above solution, when the annular pipe needs to be hoisted, the hook of the hoisting machine is first connected to the hoisting ring, and then the hoisting machine is used to move the annular pipe upward, thereby hoisting the annular pipe. The provided hoisting device facilitates hoisting of the annular pipe. The provided sliding sleeve and first spring can mitigate the strong pulling on the annular pipe, thereby reducing the possibility of the annular pipe being damaged.

[0023] Preferably, a knocking device for knocking the annular tube is installed on the annular tube corresponding to the hoisting device.

[0024] By adopting the above solution, the knocking device provided can loosen the injection device connected to the injection pipe before hoisting the annular pipe, which can reduce the difficulty of subsequently hoisting the annular pipe.

[0025] Preferably, the knocking device includes a bracket fixed to the outer wall of the annular tube, a horizontal axis rotatably connected to the bracket, and a cam fixed to one end of the horizontal axis; a fixed cylinder is fixed to the bracket, a movable plate is slidably connected in the fixed cylinder, a second spring is fixed to the top of the movable plate, and an end of the second spring away from the movable plate is fixed to the inner side of the top of the fixed cylinder; a vertical rod is fixed to the bottom of the movable plate, and a knocking plate is fixed to the end of the vertical rod away from the movable plate, the knocking plate can abut against the bottom of the annular tube, and the circumferential surface of the cam can abut against the bottom of the knocking plate; the knocking device also includes a driving mechanism for driving the horizontal axis to rotate.

[0026] By adopting the above scheme, when it is necessary to knock on the annular tube, the horizontal shaft is first driven to rotate by the driving mechanism, and the rotation of the horizontal shaft drives the cam to rotate. The cam rotates and can make the knocking plate move back and forth under the action of the second spring. The reciprocating movement of the knocking plate can knock on the annular tube multiple times, thereby loosening the injection device connected to the injection pipe; the knocking device is set to facilitate the loosening of the injection device connected to the injection pipe.

[0027] Preferably, the driving mechanism includes a rotating tube rotatably connected to the bracket and a driving rod arranged in the rotating tube; the top of the driving rod is fixed to the circumferential surface of the sliding sleeve, and the side wall of the driving rod is fixed with a plurality of spiral blocks in sequence along its circumference, and the inner wall of the rotating tube is opened with a plurality of spiral grooves in sequence along its circumference, and the plurality of spiral blocks are matched with the plurality of spiral grooves in a one-to-one correspondence; a first bevel gear is fixed on the outer side wall of the rotating tube, and a second bevel gear is fixed to the end of the horizontal shaft away from the cam, and the first bevel gear is meshed with the second bevel gear.

[0028] By adopting the above solution, when the sliding sleeve moves under the action of the lifting machinery, it drives the driving rod to move. At this time, the driving rod drives the rotating tube to rotate under the action of the spiral block and the spiral groove. The rotation of the rotating tube drives the first bevel gear to rotate. The rotation of the first bevel gear drives the second bevel gear to rotate. The rotation of the second bevel gear can drive the horizontal shaft to rotate. The provided driving mechanism facilitates the driving of the horizontal shaft to rotate.

[0029] By adopting the above solution, in summary, this application has the following beneficial effects:

[0030] 1. The installed gas barrier can effectively lower the groundwater level around the pile hole;

[0031] 2. When the injection pipe needs to be supplied with gas, first connect the nitrogen supply pipe and the connecting pipe through the electric regulating valve, and then the nitrogen passes through the intermediate pipe, the annular pipe and the vertical pipe in sequence and enters the injection pipe, so that the injection pipe can be supplied with gas; the pressure gauge and flow meter are set to facilitate the observation of flow and pressure;

[0032] 3. When the annular tube needs to be hoisted, first connect the hook of the hoisting machine to the lifting ring, then use the hoisting machine to move the annular tube upward. This way, the annular tube can be hoisted. The provided hoisting device facilitates the hoisting of the annular tube. The provided sliding sleeve and first spring can reduce the strong pulling on the annular tube, thereby reducing the possibility of the annular tube being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;

[0034] Figure 2 This is a structural diagram highlighting the injection pipe in Example 1 of the present application;

[0035] Figure 3 This is a structural diagram highlighting the hoisting device in Example 1 of the present application;

[0036] Figure 4 This is a structural diagram highlighting the striking device in the second embodiment of the present application;

[0037] Figure 5 This is a schematic structural diagram of the highlight driving mechanism in the second embodiment of the present application;

[0038] Figure 6 This is a cross-sectional view highlighting the second spring and the movable plate in the second embodiment of the present application;

[0039] Figure 7 This is a structural schematic diagram highlighting the spiral block and spiral groove in Example 2 of the present application.

[0040] Explanation of the accompanying drawings: 1. pile hole; 2. injection pipe; 21. filter ring; 22. spike part; 3. annular pipe; 31. vertical pipe; 32. intermediate pipe; 33. connecting pipe; 34. quick connector; 35. pressure gauge; 36. flow meter; 37. electric regulating valve; 38. nitrogen supply pipe; 39. pressure ring; 4. lifting device; 41. connecting rod; 42. baffle; 43. first spring; 44. sliding sleeve; 45. hanger; 46. lifting ring; 5. knocking device; 51. bracket; 52. horizontal axis; 53. cam; 54. fixed cylinder; 55. movable plate; 56. second spring; 57. vertical rod; 58. knocking plate; 6. driving mechanism; 61. rotating tube; 611. spiral groove; 62. driving rod; 621. spiral block; 63. first bevel gear; 64. second bevel gear. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-7 This application is described in further detail.

[0042] Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "bottom," and "top" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0043] Example 1

[0044] The present application discloses a method for controlling groundwater using a gas barrier, comprising the following steps:

[0045] S1. Multiple small-diameter injection pipes 2 are deployed around the area where groundwater control is required. Each injection pipe 2 has multiple injection holes (not shown) formed on its sidewall. A filter ring 21 is affixed to the outer wall of each injection pipe 2, and a spike 22 is affixed to the bottom of each injection pipe 2.

[0046] S2 uses an injection device to inject an inert gas into the ground through the injection pipe 2; the inert gas is nitrogen, which is an inert gas commonly used in industry, with large production scale and relatively low unit price, so nitrogen is used to reduce costs;

[0047] S3. Control the injection pressure and flow rate, and continuously inject to form a stable gas barrier;

[0048] S4. Use formation detection instruments to monitor soil gas concentration distribution, monitor the formation of gas barriers, and adjust injection parameters;

[0049] S5. Carry out post-maintenance after the gas barrier is formed to control the groundwater level.

[0050] The present application discloses a gas injection device for controlling groundwater using a gas barrier, comprising an annular pipe 3, a plurality of vertical pipes 31 vertically connected to the bottom of the annular pipe 3, an intermediate pipe 32 connected to the annular pipe 3, a connecting pipe 33 connected to the intermediate pipe 32, and a quick connector 34 installed on the end of the connecting pipe 33 away from the intermediate pipe 32; the tops of the plurality of injection pipes 2 are threadedly connected to the inner side walls of the bottoms of the plurality of vertical pipes 31 in a one-to-one correspondence, and each vertical pipe 31 is installed with a pressure gauge 35; the intermediate pipe 32 is U-shaped, and a flow meter 36 and an electric regulating valve 37 are installed on the connecting pipe 33; the end of the connecting pipe 33 away from the intermediate pipe 32 is connected to the nitrogen supply pipe 38 via the quick connector 34. When it is necessary to supply gas to the injection pipe 2, the nitrogen supply pipe 38 and the connecting pipe 33 are first connected through the electric regulating valve 37, and then the nitrogen passes through the intermediate pipe 32, the annular pipe 3 and the vertical pipe 31 in sequence and enters the injection pipe 2, so that the injection pipe 2 can be supplied with gas; the pressure gauge 35 and the flow meter 36 are provided to facilitate the observation of the flow and pressure.

[0051] A pressure ring 39 is connected to the outer side wall of the bottom of each vertical pipe 31. The pressure ring 39 can reduce the possibility of nitrogen escaping from the connection between the injection pipe 2 and the ground.

[0052] Multiple sets of lifting devices 4 are installed on the annular tube 3; the lifting devices 4 are arranged to facilitate the lifting of the annular tube 3, thereby facilitating the removal of the injection device and the injection tube 2. Each set of lifting devices 4 includes a connecting rod 41 vertically fixed to the outer wall of the annular tube 3, a baffle 42 fixed to the top of the connecting rod 41, and a first spring 43 vertically sleeved on the connecting rod 41; a sliding sleeve 44 is vertically slidably connected to the connecting rod 41, and the two ends of the first spring 43 are respectively fixed to the opposite inner sides of the sliding sleeve 44 and the baffle 42; a hanger 45 is vertically fixed to the top of the sliding sleeve 44, and the hanger 45 is U-shaped, and a lifting ring 46 is fixed to the top of the hanger 45. When the annular tube 3 needs to be lifted, the hook of the lifting machine is first connected to the lifting ring 46, and then the annular tube 3 is moved upward by the lifting machine, so that the annular tube 3 can be lifted; the lifting devices 4 are arranged to facilitate the lifting of the annular tube 3. The provided sliding sleeve 44 and the first spring 43 can mitigate the strong pulling on the annular tube 3, thereby reducing the possibility of the annular tube 3 being damaged by the pulling.

[0053] Example 2

[0054] A gas injection device for controlling groundwater using a gas barrier, which mainly differs from Example 1 in that a knocking device 5 for knocking the annular pipe 3 is installed on the corresponding lifting device 4. The knocking device 5 can loosen the injection device connected to the injection pipe 2 before lifting the annular pipe 3, thereby reducing the difficulty of subsequently lifting the annular pipe 3.

[0055] The knocking device 5 includes a bracket 51 fixed to the outer wall of the annular tube 3, a horizontal shaft 52 horizontally connected to the bracket 51 through a bearing, and a cam 53 fixed to one end of the horizontal shaft 52; a fixed cylinder 54 is vertically fixed to the bracket 51, and a movable plate 55 is vertically slidably connected inside the fixed cylinder 54, and a second spring 56 is vertically fixed to the top of the movable plate 55, and one end of the second spring 56 away from the movable plate 55 is fixed to the inner side of the top of the fixed cylinder 54; a vertical rod 57 is vertically fixed to the bottom of the movable plate 55, and one end of the vertical rod 57 away from the movable plate 55 is fixed to a knocking plate 58, and the knocking plate 58 can abut against the bottom of the annular tube 3, and the circumferential surface of the cam 53 can abut against the bottom of the knocking plate 58; the knocking device 5 also includes a driving mechanism 6 for driving the horizontal shaft 52 to rotate. When it is necessary to knock on the annular tube 3, the horizontal shaft 52 is first driven to rotate by the driving mechanism 6, and the rotation of the horizontal shaft 52 drives the cam 53 to rotate. The cam 53 rotates and can make the knocking plate 58 move back and forth under the action of the second spring 56. The reciprocating movement of the knocking plate 58 can knock on the annular tube 3 multiple times, so that the injection device connected to the injection pipe 2 can be loosened; the knocking device 5 is set to facilitate the loosening of the injection device connected to the injection pipe 2.

[0056] The driving mechanism 6 includes a rotating tube 61 vertically connected to the bracket 51 through a bearing and a driving rod 62 vertically arranged in the rotating tube 61; the top of the driving rod 62 is fixed to the circumferential surface of the sliding sleeve 44, and the side walls of the driving rod 62 are fixed with multiple spiral blocks 621 in sequence along its circumference. The inner wall of the rotating tube 61 is sequentially provided with multiple spiral grooves 611 along its circumference, and the multiple spiral blocks 621 are matched with the multiple spiral grooves 611 in a one-to-one correspondence; a first bevel gear 63 is fixed on the outer side wall of the rotating tube 61, and a second bevel gear 64 is fixed to the end of the horizontal shaft 52 away from the cam 53, and the first bevel gear 63 is meshed with the second bevel gear 64. When the sleeve 44 moves under the action of the lifting machinery, it drives the driving rod 62 to move. At this time, the driving rod 62 drives the rotating tube 61 to rotate under the action of the spiral block 621 and the spiral groove 611. The rotation of the rotating tube 61 drives the first bevel gear 63 to rotate. The rotation of the first bevel gear 63 drives the second bevel gear 64 to rotate. The rotation of the second bevel gear 64 can drive the horizontal shaft 52 to rotate. The driving mechanism 6 is set to facilitate driving the horizontal shaft 52 to rotate.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for controlling groundwater using a gas barrier, characterized in that: The following steps are involved: S1. A plurality of small-diameter injection pipes (2) are arranged around an area where groundwater needs to be controlled, a plurality of injection holes are opened on the side wall of each injection pipe (2), a filter ring (21) is fixedly connected to the outer wall of each injection pipe (2), and a spike portion (22) is fixedly connected to the bottom of each injection pipe (2); S2. Injecting inert gas into the ground through the injection pipe (2) using an injection device; the injection device comprises an annular pipe (3), a plurality of vertical pipes (31) connected to the bottom of the annular pipe (3), an intermediate pipe (32) connected to the annular pipe (3), a connecting pipe (33) connected to the intermediate pipe (32), and a quick connector (34) installed on the end of the connecting pipe (33) away from the intermediate pipe (32); the tops of the plurality of injection pipes (2) are threadedly connected to the inner side walls of the bottoms of the plurality of vertical pipes (31) in a one-to-one correspondence, and each of the vertical pipes (31) is installed with a pressure gauge (35); the connecting pipe (33) is installed with a flow meter (36) and an electric regulating valve (37); the end of the connecting pipe (33) away from the intermediate pipe (32) is connected through a quick connector (34). The joint (34) is connected to the nitrogen supply pipe (38); a plurality of lifting devices (4) are installed on the annular tube (3); each group of the lifting devices (4) includes a connecting rod (41) fixed to the outer wall of the annular tube (3), a baffle (42) fixed to the top of the connecting rod (41), and a first spring (43) sleeved on the connecting rod (41); a sliding sleeve (44) is slidably connected to the connecting rod (41), and the two ends of the first spring (43) are respectively fixed to the opposite inner sides of the sliding sleeve (44) and the baffle (42); a hanger (45) is fixed to the top of the sliding sleeve (44), and a hanging ring (46) is fixed to the top of the hanger (45); a tool for knocking the annular tube (3) is installed on the annular tube (3) corresponding to the lifting device (4). The knocking device (5) comprises a bracket (51) fixed to the outer wall of the annular tube (3), a horizontal shaft (52) rotatably connected to the bracket (51), and a cam (53) fixed to one end of the horizontal shaft (52); a fixed cylinder (54) is fixed to the bracket (51), a movable plate (55) is slidably connected in the fixed cylinder (54), a second spring (56) is fixed to the top of the movable plate (55), and one end of the second spring (56) away from the movable plate (55) is fixed to the inner side of the top of the fixed cylinder (54); a vertical rod (57) is fixed to the bottom of the movable plate (55), and one end of the vertical rod (57) away from the movable plate (55) is fixed to a knocking plate (58), and the knocking plate (58) can The cam (53) can abut against the bottom of the annular tube (3), and the circumferential surface of the cam (53) can abut against the bottom of the knocking plate (58); the knocking device (5) also includes a driving mechanism (6) for driving the horizontal shaft (52) to rotate; the driving mechanism (6) includes a rotating tube (61) rotatably connected to the bracket (51) and a driving rod (62) arranged in the rotating tube (61); the top of the driving rod (62) is fixed to the circumferential surface of the sliding sleeve (44), and the side wall of the driving rod (62) is fixed with a plurality of spiral blocks (621) in sequence along its circumference; the inner wall of the rotating tube (61) is sequentially provided with a plurality of spiral grooves (611) in sequence along its circumference, and the plurality of spiral blocks (621) are matched with the plurality of spiral grooves (611) in a one-to-one correspondence;A first bevel gear (63) is sleeved and fixed on the outer wall of the rotating tube (61); a second bevel gear (64) is fixedly connected to one end of the horizontal shaft (52) away from the cam (53); the first bevel gear (63) and the second bevel gear (64) are meshed; S3. Control the injection pressure and flow rate, and continuously inject to form a stable gas barrier; S4. Use formation detection instruments to monitor soil gas concentration distribution, monitor the formation of gas barriers, and adjust injection parameters; S5. Carry out post-maintenance after the gas barrier is formed to control the groundwater level.

2. The method for controlling groundwater using a gas barrier according to claim 1, characterized in that: The inert gas is nitrogen.

3. The gas injection device for controlling groundwater using a gas barrier according to claim 1, characterized in that: The outer side wall of the bottom of each vertical tube (31) is connected with a pressure ring (39).

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