CN113463671B - Dewatering well and dewatering construction method - Google Patents

Abstract

The application relates to the technical field of precipitation construction, in particular to a precipitation well and a precipitation construction method. The dewatering well penetrates through the diving aquifer and the bearing aquifer and comprises a sedimentation pipe and a strainer pipe, and the strainer pipe is provided with a shielding piece for shielding a strainer hole; the shielding piece is controlled by the control mechanism to realize whether to shield the water filtering holes or not, so that the groundwater on the upper part of the dewatering well is preferentially arranged in the dewatering well, the dewatering well is matched with the construction depth of the foundation pit, the influence of the groundwater aquifer on the water barrier layer is reduced, the blocking of the groundwater aquifer is avoided, the well point number of the dewatering well or the drainage well is effectively reduced, and the influence on the construction of the foundation pit is reduced. The precipitation construction method comprises the construction steps of lowering a well pipe, burying a filter material, extracting the water after precipitation, washing a well in precipitation and the like, wherein the filter pipe can be selectively communicated with the inside and the outside of the filter pipe by virtue of the shielding piece, and the water level of the precipitation well and the corresponding underground water is controlled to be communicated, so that whether the filter pipe is shielded by the shielding piece can be selectively controlled according to the foundation pit construction requirements.

Description

Dewatering well and dewatering construction method

Technical Field

The application relates to the technical field of precipitation construction, in particular to a precipitation well and a precipitation construction method.

Background

When carrying out deep basal pit construction in the higher region of groundwater level, because the aquifer of the soil body is cut off, the pressure differential influences, groundwater will be oozed into the foundation ditch constantly, and this will produce the disadvantage to the foundation ditch construction.

Furthermore, the groundwater layers in the same area often have multiple aquifers at the same time, and different aquifers can be separated by rock strata or other geology to form a shallow diving aquifer and a deep confined aquifer which are separated by a water barrier. The diving aquifer is positioned on the earth surface and mainly flows by the height of the terrain; the confined aquifer is located between the water barriers, has certain pressure, and when the water barrier that is located above is link up, then the rivers of confined aquifer will have the trend of surging upwards, and the rivers water level of surging probably is higher than the confined aquifer. Along with the propulsion of the foundation pit construction depth, the foundation pit construction area will receive the infiltration water influence of dive aquifer and confined aquifer in proper order.

In order to ensure the safety of foundation pit construction, the foundation pit engineering needs to carry out precipitation and drainage in a construction area range.

At present, before the construction of deep foundation pit engineering, shallow drainage wells and deep well point dewatering wells are built around a foundation pit construction area, wherein the shallow drainage wells are mainly used for dewatering and draining water flow which possibly flows to a foundation pit in a submerged aquifer. The deep-well point dewatering well is used for reducing and discharging water flow which possibly influences foundation pit construction in a confined aquifer, a well pipe with a closed side wall is mostly adopted in the region of the deep-well point dewatering well located in the diving aquifer, and the influence on the foundation pit construction caused by the fact that the water flow of the confined aquifer enters the diving aquifer through the dewatering well in a reverse osmosis mode is reduced. And a plurality of well points of the shallow drainage well and the deep well point dewatering well are constructed before the foundation pit is excavated.

Aiming at the related technologies, the inventor thinks that the number of well points arranged around the foundation pit is large, so that the limit is provided for soil excavation and foundation pit supporting in foundation pit construction, and the construction efficiency is influenced.

Disclosure of Invention

In order to improve the influence of well points quantity to the foundation pit construction, improve the efficiency of construction of foundation pit, this application provides a precipitation well and precipitation construction method.

First aspect, the application provides a precipitation well adopts following technical scheme:

a precipitation well penetrates through a diving aquifer and a confined aquifer, and at least comprises a well body, wherein each well body comprises a settling pipe and a strainer; the bottom wall of the sedimentation tube is sealed, and the opening of the sedimentation tube faces upwards; the water filter pipes are at least two sections, and all the water filter pipes in the same well body are stacked above the settling pipes end to end;

the strainer is a pipe body with a circular inner ring with a radial section; a clamping structure which rotates along the circumferential direction until the two filter pipes are clamped or separated is arranged between the adjacent filter pipes; the rotation radian of the clamping structure for clamping or detaching is a disassembling radian;

a plurality of water filtering holes are distributed on the side wall of the water filtering pipe; the inner wall of the water filtering pipe is abutted with a shielding piece for shielding a water filtering hole;

the side wall of the shielding piece is alternately provided with shielding parts for shielding water filtering holes and water permeable holes for communicating with the water filtering holes along the circumferential direction in the water filtering pipe; the radian of the shielding piece rotating to the shielding part along the circumferential direction in the water filtering pipe to avoid the water filtering holes or rotating to the water permeable holes to avoid the water filtering holes is the shielding rotation radian; the blocking rotation radian is consistent with the disassembling radian;

a control mechanism for driving the shielding piece to rotate to shield the rotating radian is arranged above the shielding piece; a connecting component is connected between the shielding piece and the control mechanism; the shielding piece and the control mechanism which are connected by the same connecting component are positioned on different filter pipes;

when the filter pipes rotate and the disassembly and assembly radians are arranged on the adjacent filter pipes, the control mechanism which is arranged on the filter pipes in a driving way drives the corresponding shielding pieces to shield the filter holes.

Through adopting above-mentioned technical scheme, adopt the shielding piece to shelter from the drainage hole that is located corresponding lower groundwater level for the priority in the precipitation well falls the row and is located the groundwater on upper portion, makes it and foundation ditch construction degree of depth looks adaptation, reduces groundwater aquifer and receives the water barrier influence and appear blocking, is difficult to adopt the problem of same precipitation well.

The adjacent filter pipes are connected through a clamping structure, so that the filter pipes are convenient to mount and dismount; the assembly and disassembly radian of the water filter pipe which needs to be rotated during assembly or disassembly is consistent with the shielding rotation radian of the shielding piece for shielding or avoiding the water filter hole, so that when the water filter pipe is arranged above, the drive control mechanism drives the connecting component to drive the shielding piece to shield the water filter hole, and water flow at the position corresponding to the water filter hole is prevented from entering the precipitation well; when the water filter pipe above the ground of the foundation pit is disassembled, the driving control mechanism drives the shielding piece to avoid the water filter hole through the connecting assembly, the water filter hole is communicated with the water permeable hole, the groundwater corresponding to the water level of the water filter pipe smoothly enters the dewatering well, and the groundwater at other water levels is kept to be shielded and limited by the shielding piece. Therefore, the number of well points of the dewatering well or the drainage well can be effectively reduced, and the influence on foundation pit construction is reduced.

And the shielding piece has the hole of permeating water, and accessible narrow range removes the shielding piece for the hole of permeating water with correspond the drainage hole intercommunication, realize that the strainer is in operating condition.

Optionally, the control mechanism includes a push ring through which the connection assembly passes; the push ring is fixed on the inner wall of the water filtering pipe and avoids the position where the shielding piece is installed.

By adopting the technical scheme, when the filter pipes are abutted to the upper surfaces of the adjacent filter pipes, the push ring is sleeved on the corresponding connecting component, and then the filter pipes are rotated to drive the connecting component and the corresponding shielding piece to shield the filter holes.

Optionally, the blocking piece is an inner blocking pipe sleeved on the inner wall of the water filtering pipe.

By adopting the technical scheme, the blocking piece is the annular inner blocking pipe, so that the blocking piece can rotate along the circumferential direction of the inner wall of the water filtering pipe, and the rotation precision of the blocking piece controlled by the control mechanism is improved.

Optionally, the clamping structure includes a clamping groove and a projection; one end of each of the end surfaces of two adjacent filter pipes which are abutted against each other is provided with a clamping groove, and the other end is provided with a lug; one side of the lug towards the adjacent clamping groove is provided with an embedded block;

the width of the embedded block is larger than that of the lug along the same radial direction parallel to the water filter pipe;

the clamping groove is provided with an inserting part for the insertion of the embedded block and the convex block and a clamping part for the clamping of the embedded block; a limiting block matched with the convex block is arranged on one side of the clamping part away from the bottom of the clamping groove; the radian that the inserted block moves to the inserting part from the clamping part along with the water filter pipe is the disassembly radian.

By adopting the technical scheme, the adjacent filter pipes are connected by adopting the clamping structure with the clamping grooves and the convex blocks, so that the construction efficiency of installation and disassembly of the filter pipes can be improved. And when the control mechanism rotates along with the water filtering pipe, the connecting component drives the shielding piece to rotate so as to enable the water filtering hole to be communicated with the water permeable hole.

Optionally, the strainer is provided with at least three sections; and at least one filter pipe is arranged between the filter pipe where the shielding piece is positioned and the filter pipe where the control mechanism is positioned at intervals.

Through adopting above-mentioned technical scheme, certain height is separated between control mechanism and the shielding piece, and this height is not less than at least one strainer, according to actual demand, can make the control mechanism control in same coupling assembling be located the shielding piece of more below for control the rotation operation that the shielding piece avoided the drainage hole in advance, reduce the influence that the shielding piece falls the drainage operation to the strainer is located different groundwater levels.

Optionally, the same connecting assembly is inserted into at least three filter pipes, wherein the control mechanism is fixed to the filter pipe located on the upper side of the connecting assembly, the shielding member is arranged on the filter pipe located on the lower side of the connecting assembly, and the auxiliary ring is arranged on the shielding member located on the inner side of the filter pipe located in the middle; the auxiliary ring is sleeved on the connecting component; the radian of the connecting assembly rotating around the axial direction of the filter pipe in the auxiliary ring is not less than the disassembly and assembly radian.

By adopting the technical scheme, the auxiliary ring can enable the connecting component to cross at least one water filtering pipe and be stably connected with the control mechanism and the shielding piece, so that the control mechanism effectively controls the shielding piece to avoid the operation of a water filtering hole or shield the water filtering hole through the connecting component; meanwhile, the auxiliary ring is provided with a space for the connecting assembly to move, and when the connecting assembly is controlled by the control mechanism to drive the shielding piece to rotate, the shielding piece where the auxiliary ring is located is influenced, so that the condition of error rotation is reduced.

Optionally, the device at least comprises two settling tubes, and a plurality of filter tubes are connected above each settling tube; the at least one settling pipe and the strainer connected with the settling pipe are positioned above the confined aquifer.

By adopting the technical scheme, the well body structure formed by two groups of settling pipes and the water filtering pipes which are connected with each other is built at the same well point position, and the water reducing and draining requirements of the diving aquifer and the confined aquifer are corresponded one by one, so that the influence of the pressure of water flow in the confined aquifer on the water reducing and draining of the diving aquifer is further reduced.

Optionally, an outer connecting rod is connected between the sedimentation tube and the strainer and between adjacent strainers, the outer connecting rod abuts against the outer wall of the strainer or the sedimentation tube, and the axial direction of the outer connecting rod is parallel to the axial direction of the strainer; the outer walls of the settling pipe and the water filtering pipe are provided with lantern rings for the outer connecting rod to penetrate through; all the outer connecting rods positioned in the same axial direction are connected end to end.

Through adopting above-mentioned technical scheme, can be with sedimentation tube, strainer stable connection through outer connecting rod than the lantern ring.

In a second aspect, the application provides a precipitation construction method, which adopts the following technical scheme:

a dewatering construction method adopting the dewatering well is characterized in that: the method comprises the following construction steps:

drilling to form a hole, and drilling to form a well hole at the target position; filling mud into the hole in the drilling process;

cleaning holes and changing slurry, after drilling into a target depth, punching a well hole, removing sundries in the hole, and adjusting the density of slurry in the hole;

a well casing is arranged, and comprises a checking sedimentation pipe, a water filter pipe, a filling bed charge and a mounting well casing; the inspection sedimentation tube and the strainer comprise: adjusting a shielding piece to shield a water filtering hole of the water filtering pipe, filling clay in the water filtering hole, and checking whether the bottom wall of the settling pipe is firmly plugged or not; the paving bottom material comprises: filling and paving aggregate with a certain height at the bottom of the well hole to form a base layer; the installation well tubular includes: connecting adjacent sedimentation pipes or strainer pipes in sequence to form a well pipe; fixedly connecting a shielding piece in the filter pipe with a corresponding control mechanism through a connecting assembly, and driving the shielding piece to shield the filter hole by the control mechanism along with the installation operation of the filter pipe; slowly sinking the well pipe until the sediment pipe at the lowest part sinks to be abutted against the base layer;

filling a filter material, adjusting the well pipe to enable the axial deviation between the well pipe and the well hole to be within a design range, and filling the filter material between the well pipe and the inner wall of the well hole, wherein the diameter of the filter material is larger than that of a water filtering hole;

after dewatering, pulling out the pipes, and sequentially detaching the strainer pipes and the control mechanism which are higher than the ground of the foundation pit according to design requirements; when the filter pipes are detached, the control mechanism fixed on the filter pipes is driven to adjust the corresponding shielding parts to avoid the filter holes, so that the corresponding filter pipes continue to drop water.

By adopting the technical scheme, the filter pipes can be selected to be communicated with the inside and the outside of the filter pipes by virtue of the shielding piece, whether the precipitation well is communicated with the corresponding groundwater level or not is controlled, and whether the filter pipes are shielded by the shielding piece or not is selected and controlled conveniently according to the foundation pit construction requirement. The operation of the shield for shielding the strainer is controlled by a control mechanism installed in the strainer.

Optionally, the system further comprises a water-lowering well washing step, wherein a shielding piece corresponding to the uppermost strainer is adjusted to separate the shielding piece from the strainer hole, so that the strainer hole is communicated with the strainer; pumping water by adopting a domestic air compressor, and pumping water in the well pipe to clean the well pipe; and dredge the water filtering holes and the corresponding passages of the aquifer.

By adopting the technical scheme, the blocking piece blocks the communication between the dewatering well and the underground water flow through the water filtering pipe, so that the water filtering pipe and the underground water flow are not smooth, and the dewatering and drainage effects are influenced; and because the dewatering well is connected with the diving aquifer and the confined aquifer, the axial length is longer, and the wall of the dewatering well and the like can be greatly silted after long-time use. Consequently, pull out behind the worry water pipe that is located foundation ditch ground top, carry out the well washing to the precipitation well, can promote the corresponding groundwater rivers of drainage hole intercommunication, make the precipitation well play the drainage function that falls that corresponds, keep the inside rivers cleanliness of precipitation well simultaneously, reduce the use that influences deep well immersible pump.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the blocking piece is adopted to block the water filtering holes corresponding to the lower groundwater level, so that the groundwater in the dewatering well is preferentially drained to the upper part, the groundwater is matched with the construction depth of the foundation pit, the blocking of the groundwater aquifer due to the influence of the water barrier is reduced, the number of well points of the dewatering well or the drainage well is effectively reduced, and the influence on the construction of the foundation pit is reduced;

2. the shielding piece has the hole of permeating water, and the accessible narrow range removes the shielding piece for the hole of permeating water with correspond the strainer hole intercommunication, realize that the strainer is in operating condition.

Drawings

FIG. 1 is a schematic view showing the structure of a dewatering well in example 1;

FIG. 2 is a schematic view of the well body;

FIG. 3 is a schematic view of a connection structure between adjacent well pipes, which mainly embodies a snap-fit structure;

FIG. 4 is a schematic view of the internal structure of the well;

FIG. 5 is an enlarged view of portion A of FIG. 1, which mainly shows the connection structure of the shield and the strainer;

fig. 6 is a schematic structural view of a water filter pipe in embodiment 1, which mainly shows the structure of a control mechanism;

fig. 7 is a schematic structural view of a water filter pipe in embodiment 2, which mainly shows the structure of a control mechanism;

FIG. 8 is a schematic view showing the structure of a dewatering well in example 3;

fig. 9 is a flow chart of a precipitation construction method according to embodiment 4.

Description of reference numerals: 1. a soil structure; 11. a diving aquifer; 12. a confined aquifer; 13. a water barrier layer;

2. a settling tube; 21. a ring pipe; 22. isolating the grid;

3. a water filter pipe; 31. water filtering holes; 32. a ring groove;

4. a wellbore pipe; 41. a collar; 42. an outer link; 43. a nylon mesh;

5. a clamping structure; 51. a card slot; 511. an insertion part; 512. a clamping part; 513. a limiting block; 52. a bump; 53. an insert block;

6. a shield; 61. a snap ring; 62. water permeable holes; 63. a shielding portion; 64. an auxiliary ring;

7. a control mechanism; 71. a push ring; 72. a notch; 73. a baffle plate;

8. a connection assembly; 81. a fixing rod; 82. a movable rod;

9. deep well submersible pumps; 101. filtering the material; 102. a base layer.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

Referring to fig. 1, a soil structure 1 mainly comprises a diving aquifer 11, a water barrier 13 and a confined aquifer 12. Wherein the diving aquifer 11 is positioned on the earth surface and mainly flows by the height of the terrain; when sheltered, the flow of the diving aquifer 11 at the same level will be blocked. The water-barrier layer 13 and the confined aquifer 12 may have a plurality of layers, and are alternately arranged below the diving aquifer 11. The confined aquifer 12 has a certain pressure, and when the water barrier 13 located above is penetrated, the water flow of the confined aquifer 12 tends to gush upwards, and the water level of the gushed water flow may be higher than that of the confined aquifer 12.

The deep foundation pit engineering construction depth may involve a diving aquifer 11, a confined aquifer 12 and a water barrier 13.

Under the influence of the water flow of the diving aquifer 11 and the confined aquifer 12, accidents such as water leakage, landslide and the like may exist in the construction process of the foundation pit, and the construction of deep foundation pit engineering is influenced to a certain degree.

In order to reduce the influence of underground water on deep foundation pit engineering, precipitation wells and/or drainage wells are generally built in the foundation pit construction range before the foundation pit construction, so that the soil body in the foundation pit range is kept relatively dry in the construction process. The dewatering well is deep in buried depth, is usually used for a deep well point dewatering construction method, has the characteristics of large displacement, large dewatering depth, large dewatering range and the like, and is suitable for reducing the influence of the confined aquifer 12 on the construction soil body. The drainage well is shallow in buried depth and is suitable for draining the influence of foundation pit construction soil on the submerged aquifer 11.

However, if the number of dewatering wells and drainage wells is large in the process of foundation pit construction, certain interference influence may be caused on the steps of foundation pit excavation, construction and the like, so that the dewatering wells capable of discharging water flow of both the diving aquifer 11 and the confined aquifer 12 are arranged at the same well point position, and the influence of the number of the plurality of well points on the foundation pit construction efficiency is relieved through the dewatering wells.

Example 1

The embodiment of the application discloses precipitation well.

Referring to fig. 1, the dewatering well comprises at least one well body, and all the well bodies are installed at the same well point position in a tail-ending connection mode.

In the embodiment, only one well body is provided, and the well body comprises at least three well body pipes 4, wherein the well body pipe 4 positioned at the lowest part is a sedimentation pipe 2 and is arranged in a confined aquifer 12; all other well pipes 4 are water filter pipes 3, and penetrate through a diving aquifer 11, a water barrier 13 and a confined aquifer 12.

Referring to fig. 1, the bottom wall of the settling tube 2 is sealed with the opening facing upward. The strainer 3 is a through pipe communicated up and down, and the inner diameter of the strainer 3 is consistent with that of the sedimentation pipe 2.

Referring to fig. 2, each well body pipe 4 is provided with a collar 41, and outer connecting rods 42 are connected between adjacent well body pipes 4, and each outer connecting rod 42 is inserted into the collar 41 of the corresponding well body pipe 4. The axial direction of the outer connecting rod 42 is parallel to the axial direction of the well body pipe 4. All outer links 42 in the same axial direction are connected end to end.

In this embodiment, at least two outer tie rods 42 may be disposed circumferentially adjacent the wellbore tubular 4. The outer wall of the same well body pipe 4 is provided with at least two lantern rings 41 for the same outer connecting rod 42 to penetrate through. The adjacent outer connecting rods 42 can be connected into a rod body in the same axial direction through threaded connection, sleeve connection or clamping connection.

The outer connecting rod 42 and the lantern ring 41 can be connected through threads, so that the connection strength of the outer connecting rod 42 and the well body pipe 4 is improved, and the connection stability between the adjacent well body pipes 4 is improved.

Referring to fig. 2, the adjacent well body pipes 4 can be tightly connected through the lantern ring 41 and the outer connecting rod 42, so that the whole dewatering well is tightly connected, and the whole axiality is within the design range.

The nylon net 43 used for reducing the silting problem between the well body pipe 4 and the well body pipe 4 can be additionally arranged between the adjacent well body pipes 4, the nylon net 43 can be locked by a hoop or other fasteners, and meanwhile, the nylon net 43 is pressed by the outer connecting rod 42 to be firmly propped against the outer walls of the water filter pipes 3 or the sedimentation pipes 2.

Referring to fig. 3, a clamping structure 5 is arranged between adjacent well body pipes 4, and the clamping structure 5 is used for realizing clamping or separation between the well body pipes 4 along the circumferential direction of the well body pipes 4, and has the effect of convenience in disassembly and assembly. The latch structure 5 includes a latch slot 51 and a projection 52. That is, the detachable connection between the strainer 3 and the settling tube 2 or other strainers 3 abutted thereto is realized by the clamping structure 5.

Referring to fig. 3, one of the end surfaces of the adjacent well pipes 4 abutting against each other is provided with a clamping groove 51, and the other end surface is provided with a convex block 52; the protrusion 52 is provided with an insert 53 at a side facing the adjacent slot 51.

The width of the insert 53 in the same radial direction parallel to the wellbore tubular 4 is greater than the width of the projection 52; the slot 51 is provided with an insertion part 511 for the insertion of the insert 53 and the projection 52 and a clamping part 512 for the clamping of the insert 53; a limiting block 513 matched with the convex block 52 is arranged on one side of the clamping part 512 far away from the groove bottom. The clamping groove 51 and the convex block 52 can realize quick assembly and disassembly between the adjacent well body pipes 4, and the connection efficiency of the dewatering well is improved.

In this embodiment, the clamping groove 51 is disposed on the lower end surface of the upper well body tube 4 of the two adjacent well body tubes 4, and the corresponding protrusion 52 is disposed on the upper end surface of the lower well body tube 4, so that water accumulation, dust deposition and the like of the clamping groove 51 can be reduced.

The end face of the adjacent well body pipe 4 is abutted, the end face positioned below is an inclined upward conical surface, and the end face positioned correspondingly above is an inclined downward conical surface.

Referring to fig. 3 and 4, a plurality of drainage holes 31 are disposed on the side wall of the drainage tube 3; a shielding piece 6 for shielding the water filtering holes 31 is attached to the inner wall of the water filtering pipe 3; a connecting assembly 8 is connected between the shutter 6 and the control mechanism 7. The control mechanism 7 and the shield 6, which are connected by the same connection assembly 8, are located on different filter tubes 3.

Referring to fig. 3 and 4, in the present embodiment, the water filter tube 3 is a circular tube with an equal inner diameter; the shielding piece 6 is an inner blocking tube sleeved on the inner wall of the filter tube 3, so that the shielding piece 6 can rotate circumferentially along the inner wall of the filter tube 3. The side wall of the shield 6 is alternately provided with a shielding part 63 for shielding the water filtering holes 31 and water permeable holes 62 for communicating with the water filtering holes 31 along the circumferential direction of the water filtering pipe 3.

Referring to fig. 4 and 5, in order to improve the circumferential position stability of the shielding member 6 with respect to the filter pipes 3, the accuracy of the shielding portion 63 and the permeable holes 62 of the shielding member 6 alternately corresponding to the filter holes 31 is improved, the retaining ring 61 is provided on the outer wall of the shielding member 6 extending radially toward the filter pipes 3, and the ring groove 32 corresponding to the retaining ring 61 is provided on the filter pipes 3.

The radian of the shielding piece 6 rotating to the shielding part 63 to avoid the water filtering holes 31 or rotating to the water filtering holes 62 to avoid the water filtering holes 31 along the inner circumference of the water filtering pipe 3 is the shielding rotation radian; (ii) a The radian of the rotation of the clamping structure 5 between the adjacent well body pipes 4 is the disassembly radian, i.e. the radian of the insert 53 moving from the clamping part 512 to the insertion part 511 along with the strainer 3 is the disassembly radian. The shielding rotation radian is consistent with the dismounting radian.

Referring to fig. 4, in the present embodiment, the connecting assembly 8 includes a fixing rod 81 and a movable rod 82, and the movable rod 82 is connected to an upper end portion of the fixing rod 81. The movable rod 82 and the fixed rod 81 can be detachably connected by a screw connection, a snap connection or the like so as to realize the quick detachment and installation of the fixed rod 81 and the movable rod 82.

The fixing rod 81 is disposed in a direction parallel to the axial direction of the shielding member 6, one side of the fixing rod 81 avoids the water permeable hole 62 and is fixed to the shielding member 6, and the other side of the fixing rod 81 extends upward to the upper side of the strainer 3 where the shielding member 6 is located.

The movable rod 82 can extend the axial length of the fixed rod 81, so that the movable rod 82 is connected to the strainer 3 above the shield 6 fixedly connected to the fixed rod 81 or directly connected to the fixed rod 81.

Referring to fig. 4 and 6, the control mechanism 7 includes a push ring 71 through which the fixing rod 81 is inserted. In this embodiment, the push ring 71 is fixed to the inner wall of the drainpipe 3 so as to avoid the position where the shutter 6 is mounted. The shield 6 is inserted into the middle of the strainer 3 having the strainer holes 3, and the push ring 71 is provided at the end of the strainer 3. In order to improve the effect of the pushing ring 71 driving the fixing rod 81 to rotate, the two ends of the strainer 3 may be provided with the pushing ring 71. When the strainer 3 is manufactured, the push ring 7 of one end of the strainer 3 may be integrally manufactured with the strainer 3, thereby improving the coupling strength between the push ring 71 and the strainer. The push ring 71 at the other end of the filter tube 3 may be fixed to the filter tube 3 by welding or other fixing means after the filter tube 3 is fitted over the shield 6. The control mechanism 7 is arranged at the position of the filter pipe 3 and the position for installing the shielding piece 6 in a staggered manner, and the influence of the control mechanism 7 on the rotation of the shielding piece 6 in the same filter pipe 3 is reduced.

Referring to fig. 4 and 6, in the present embodiment, the push ring 71 is a closed ring. The inner diameter of the pushing ring 71 is matched with the outer diameter of the movable rod 82, so that the movable rod 82 can penetrate through the pushing ring and can be detachably connected with the corresponding fixed rod 81.

When the adjacent filter pipes 3 are installed, the movable rod 82 is firstly inserted into the pushing ring 71; then moving the filter pipes 3 to the upper surfaces of the filter pipes 3 to be connected; then, the movable rod 82 is connected with the corresponding fixed rod 81; then the filter pipe 3 is controlled to rotate and install along the circumferential direction, so that the push ring 71 drives the shielding piece 6 to shield the filter hole through the movable rod 82 and the fixed rod 81

When the drainage pipe 3 is detached, the push ring 7 is just driven to drive the movable rod 82 and the fixed rod 81 to drive the shielding piece 6 to rotate, so that the drainage hole 31 is communicated with the drainage hole 62, and water can sequentially pass through the drainage hole 31 and the drainage hole 62 from the outside of the dewatering well and enter the dewatering well.

Referring to fig. 4, the same connecting assembly 8 can be inserted into at least three strainer pipes 3, that is, the same well body has at least three strainer pipes according to the actual drainage requirement.

Referring to fig. 4, at least one filter tube 3 is spaced between the barrier 6 and the filter tube 3 corresponding to the control mechanism 7 connected by the same connecting assembly 8, that is, the filter tube 3 located in the middle of the connecting assembly 8. The inner wall of the shielding member 6 sleeved on the filter tube 3 located in the middle of the connection assembly 8 is provided with at least one auxiliary ring 64 for the movable rod 82 to penetrate through. The fixing rod 81 may be inserted into the auxiliary ring 64 by connecting the movable rod 82. The radian of the movable rod 82 rotating around the axial direction of the water filter pipe 3 in the auxiliary ring 64 is not less than the disassembly and assembly radian.

Control mechanism 7 extension control interval, control are located shielding piece 6 of control mechanism 7 place strainer 3 below, can be when the strainer 7 is dismantled, communicate strainer hole 31 and permeable hole 61 in advance, reduce the influence that shielding piece 6 normally falls the drainage operation to strainer 3.

The auxiliary ring 64, which is located in the same connecting assembly 8, improves the stability of the connection of the connecting assembly 8 to the control mechanism 7 and to the shutter 6 and also helps to keep the fixed rod 81 and the movable rod 82 axially stable.

In order to improve the control effect of the control mechanism 7 on the axial rotation of the shielding member 6 around itself to shield the water filtering holes 31 or avoid the water filtering holes 31, each shielding member 6 can be connected to two control mechanisms 7 through at least two groups of connecting assemblies 8, and the two control mechanisms 7 are located on the same water filtering pipe 3.

Example 2

The application discloses precipitation well.

Referring to fig. 7, the present embodiment is different from embodiment 1 in that: the control mechanism 7 is different in structure.

Referring to fig. 4 and 7, in the present embodiment, the pushing ring 71 is provided with a notch 72 for the connecting assembly 8 to be clamped into the pushing ring 71 in a direction perpendicular to the axial direction of the pushing ring 71.

The upper end of the fixing rod 81 can extend to the same horizontal position as the push ring 7 and penetrate into the push ring 71 through the notch 72. The inner wall of the push ring 71 has a rotation range for the fixing rod 81 to axially rotate around the strainer 3 to shield or connect the strainer holes 31, and the rotation range corresponds to the disassembly and assembly radian.

The notch 72 can be located at a side of the pushing ring 71 away from the inner wall of the water filter 3, and when the fixing rod 81 drives the shielding member 6 to rotate, the fixing rod 8 abuts against one side of the pushing ring 71 located at two sides of the notch 72. Or the notch 72 may be located at a side portion of the push ring 71 adjacent to the inner wall of the water filter 3, so that the push ring 71 can be clamped without the fixing rod 81 having a radial elastic function, i.e., the fixing rod 81 is kept vertical. In this embodiment, the notch 72 is located at a side of the pushing ring 71 adjacent to the inner wall of the water filtering pipe 3, so as to improve the stability of the connection between the fixing rod 81 and the shielding member 6.

Referring to fig. 7, in particular, the side of the pushing ring 71 having the notch 72 is provided with a blocking piece 73 for rotatably blocking the notch 72. One side of the baffle plate 73 is connected to one side of the push ring 71 away from the inner wall of the strainer 3, and the other side of the baffle plate 73 normally abuts against the inner wall of the strainer 3. The flap 73 has a certain elasticity on the side connected to the push ring 71, or the flap 73 is connected to one side of the push ring 71 in a hinged manner. When the blocking piece 73 is pressed against the side of the pushing ring 71 away from the water filter pipe 3, the gap 72 is just for the fixing rod 81 to pass through.

Referring to fig. 4 and 7, when the fixing rod 81 is inserted into the notch 72, the blocking piece 73 abuts against one side of the strainer 3 and rotates toward the other side of the notch 72 until the fixing rod 81 is completely clamped into the pushing ring 71. After the fixing rod 81 is clamped on the pushing ring 71, the blocking piece 73 is reset, and one side far away from the pushing ring 71 is abutted against the inner wall of the filter pipe 3. When the pushing ring 71 rotates with the filter tube 3, the fixing rod 81 can abut against the stop piece 73 or be clamped at a side of the pushing ring 71 close to the notch 72.

In use, the upper end of the fixed rod 81 can be inserted through the notch 72 and positioned in the pushing tube 71 by the connecting movable rod 82.

Example 3

The application discloses precipitation well.

Based on embodiment 1 or embodiment 2, the present embodiment is different from embodiment 1 or embodiment 2 in that:

referring to fig. 8, in the embodiment, there are at least two well bodies, one well body is arranged in each confined aquifer 12, and one well body is arranged in each submerged aquifer 11 and the adjacent water-resisting layer 13 in a penetrating mode. All the well bodies are connected in a tail way and positioned at the same well point position. In this embodiment, two wells are used as an example for illustration. Each well body at least comprises three well body pipes 4, the well body pipe 4 positioned at the lowest position in the same well body is a sedimentation pipe 2, and the rest are filter pipes 3. The bottom wall of the settling tube 2 is sealed, and the opening faces upwards. The strainer 3 is a through pipe which is communicated up and down, and the inner diameter of the strainer 3 is consistent with that of the sedimentation pipe 2.

Referring to fig. 4 and 8, the structure of the filter tube 3 and the connection assembly 8 in this embodiment is the same as the structure of the filter tube 3 in embodiment 1 or embodiment 2.

That is, adjacent well bodies are not communicated, and the sealing structure of the sedimentation pipe 1 of the well body positioned above can shield the water flow of the confined aquifer 12 possibly received by the well body positioned in the confined aquifer 12, thereby reducing the upward permeation of the water 12 in the confined aquifer.

The outer walls of all the well body pipes 4 of the two well bodies are connected with an outer connecting rod 42 through lantern rings 41; the strainer 3 that looks butt in two well bodies passes through the joint structure 5 with the sedimentation tube 2 and realizes dismantling the connection.

The two wells have the same structure as in example 1. The differences are that: the lower part of the settling pipe 2 of the upper well body is provided with a ring pipe 21 for installing the control mechanism 7, and the opening of the ring pipe 21 faces to the water filtering pipe 3 below the ring pipe. The strainer 3 is fixed with a control mechanism 7 which is used for driving a baffle piece 6 in the strainer 3 below the strainer to shield or avoid the strainer hole 31.

The control mechanism 7 located in the lower well is the same as in example 2.

The shield 6 in the lower well block strainer 3 is mounted through the push ring 71 by a connector assembly 8.

Example 4

The embodiment discloses a precipitation construction method.

Referring to fig. 9, based on embodiment 1, embodiment 2, or embodiment 3, the precipitation construction method includes S010 construction preparation, S020 well level measurement and release, S030 drilling to form a hole, S040 hole cleaning and slurry changing, S050 well casing, S060 filter material filling, S070 precipitation pre-well flushing, S080 precipitation complete pipe pulling, and other construction steps.

Referring to fig. 2 and 8, S010 prepares for construction, and prepares construction materials or equipment, wherein the construction materials or equipment comprise a strainer 3, a settling pipe 2, an isolation grid 22, a nylon net 43, an outer connecting rod 42, a movable rod 82, a filter material 101, a deep well submersible pump 9 and the like. Wherein the water filter pipe 3 and the sedimentation pipe 2 are sand-free concrete deep well pipes, and the nylon net 43 is a 40-60 mesh nylon net 43.

And S020 measuring well placement, and measuring the position of a well placement point according to a well placement plane layout. If influenced by construction conditions, the position of the construction well point can be properly adjusted.

S030 drilling a hole, and drilling the hole at the target position to form a well hole; the drilling process adopts the same aperture, and one aperture reaches the bottom. When the drilling construction reaches the design depth, the drill should be used for 0.3-0.5m more. And the hole is filled with slurry in the drilling process.

Adopting clear water pressure balance method to strike and drilling pore-forming, drawing the core with taking out a section of thick bamboo and drilling, the surface of water height in the assurance hole is level with the drill way during the construction, prevents the hole collapse accident and takes place. If a sand flowing layer with easy hole collapse or a stratum with serious mud loss is drilled, the mud concentration in the hole can be increased by adopting less clay throwing, so that the hole collapse is prevented.

When a water-resisting clay layer is encountered, in order to prevent mud skin from forming on the hole wall during impact hole forming and influence the water yield of a well, secondary hole expanding is carried out after hole forming, and the diameter of the expanded hole is 50-100 mm larger than the designed diameter.

And S040 cleaning the hole and replacing the slurry, after drilling into the target depth, extracting the drilling tool out of the hole, and then continuously performing positive circulation operation by using the clean water to replace the slurry until the viscosity of the slurry is less than 20 seconds. When mud is replaced, the water supply pipe is lowered to a position about 0.5m away from the bottom of the hole, so that thick mud is returned into the hole, and the well washing quality and the water yield of the dewatering well are ensured.

The S050 well pipe comprises the steps of S051 checking the settling pipe 2, water filter pipes 3 and S052 filling and paving bottom materials, S053 installing well pipes and the like.

Specifically, S051 checks the settling tube 2 and the filter tube 3, the adjusting shielding piece 6 shields the filter hole 31 of the filter tube 3, clay is filled in the filter hole 31, and whether the bottom wall of the settling tube 2 is firmly blocked or not is checked;

s052, filling and laying a base material, and filling and laying aggregate with a certain height at the bottom of the well hole to form a base layer 102; the aggregate can be coarse sand with particles larger than the water filtering holes 31 of the water filtering pipe 3.

Referring to fig. 2 and 9, S053 installs well pipes, connects the adjacent settling tubes 2 or strainer tubes 3 in sequence, fixedly connects the shielding member 6 in the strainer tube 3 with the corresponding control mechanism 7 through the connection assembly 8, and wraps the nylon mesh 43 between the adjacent strainer tubes 3, the strainer tubes 3 and the settling tubes 2 to form well pipes; and slowly sinking the well pipe until the lowermost settling pipe 2 is sunk against the substrate 102.

Referring to fig. 1 and 8, simultaneously, the side of the settling tube 2 close to the opening is provided with a detachable isolation grid 22 for limiting the deep well submersible pump and the like to enter the bottom of the settling tube 2, and the problem that the pumping of the deep well submersible pump is affected by the rising of the sediment in the settling tube 2 is reduced.

Referring to fig. 1 and 9, S060 of filling the filter material 101, adjusting the well casing to make the axial deviation between the well casing and the borehole within the design range, and uniformly and slowly filling the filter material 101 around the well casing and the inner wall of the borehole to avoid bridging in the borehole; the diameter of the filter material 101 is larger than that of the water filtering hole 31.

S070, washing the well before dewatering, namely, washing the well by using clean water, pumping the clean water by using an original drilling pump, namely, after the slurry of the clean water is changed, continuously washing the well in a circulating mode. And a pressure fan can be used for washing the well, and if the sinking ratio in the well is not enough, clear water is injected, and the well is washed until the sand is cleaned.

S080, after the pipe is pulled out after the water is reduced, monitoring the depth of the working surface of the foundation pit and the water level difference in the water reducing well, wherein the water level difference meets the water reducing requirement; according to design requirements, sequentially detaching the strainer 3 and the control mechanism 7 which are higher than the ground of the foundation pit; before the control mechanism 7 is detached, the corresponding shielding piece 6 is adjusted to be separated from the water filtering holes 31, so that the corresponding water filtering pipe 3 continues to drop water.

When the filter tube is disassembled, the outer connecting rod 42 corresponding to the filter tube 3 or the sedimentation tube 2 to be disassembled is detached from the sleeve and the outer connecting rod 42 connected with the sleeve; the nylon net 43 is detached again; then the control mechanism 7 drives the fixing rod 81 to drive the shielding piece 6 to move to the water permeable hole 62 to be communicated with the water filtering hole 31; then, the drainpipe 3 is removed, and the movable rod 82 and the control mechanism 7 connected to the fixed rod 81 are removed.

Referring to fig. 5, after the pipes are pulled out section by section, before the pipes are put into precipitation again, well washing in precipitation can be carried out. Adjusting the shielding piece 6 corresponding to the uppermost strainer 3 to separate the shielding piece 6 from the strainer holes 31, so that the strainer holes 31 are communicated with the strainer 3; pumping water by using an air compressor, and pumping water in the precipitation well to clean the precipitation well; and dredge the passageway of drainage hole and corresponding aquifer, promote drainage hole 31 intercommunication to correspond aquifer rivers, make the precipitation well play the drainage function that falls that corresponds, keep the inside rivers cleanliness of precipitation well simultaneously, reduce the use that influences deep well immersible pump.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (7)

1. A precipitation well, runs through dive aquifer (11) and confined aquifer (12), its characterized in that: the dewatering well at least comprises a well body, and each well body comprises a settling pipe (2) and a strainer (3); the bottom wall of the sedimentation pipe (2) is sealed, and the opening of the sedimentation pipe faces upwards; the number of the filter pipes (3) is at least two, and all the filter pipes (3) in the same well body are overlapped above the sedimentation pipes (2) end to end;

the strainer (3) is a pipe body with a radial section and a circular inner ring; a clamping structure (5) which rotates along the circumferential direction until the two filter pipes (3) are clamped or separated is arranged between the adjacent filter pipes (3);

the clamping structure (5) comprises a clamping groove (51) and a convex block (52); one end surface of each two adjacent water filtering pipes (3) is provided with a clamping groove (51), and the other end surface is provided with a convex block (52); an embedded block (53) is arranged on one side, facing the adjacent clamping groove (51), of the convex block (52);

the width of the embedded block (53) is larger than that of the lug (52) along the same radial direction parallel to the filter pipe (3);

the clamping groove (51) is provided with an inserting part (511) for the insertion of the embedded block (53) and the convex block (52) together and a clamping part (512) for the clamping of the embedded block (53); a limiting block (513) matched with the convex block (52) is arranged on one side of the clamping part (512) far away from the bottom of the clamping groove (51); the radian that the embedded block (53) moves from the clamping part (512) to the inserting part (511) along with the water filter pipe (3) or the radian that the clamping part (512) is detached from the inserting part (511) is taken as a disassembling radian;

a plurality of water filtering holes (31) are distributed on the side wall of the water filtering pipe (3); the inner wall of the water filtering pipe (3) is abutted with a shielding piece (6) for shielding the water filtering hole (31);

the side wall of the shielding piece (6) is alternately provided with shielding parts (63) for shielding the water filtering holes (31) and water permeable holes (62) for communicating with the water filtering holes (31) along the inner circumference of the water filtering pipe (3); the radian that the shielding piece (6) rotates to the shielding part (63) along the inner circumferential direction of the water filtering pipe (3) to avoid the water filtering holes (31) or rotates to the water permeable holes (62) to avoid the water filtering holes (31) is the shielding rotation radian; the shielding rotation radian is consistent with the disassembling and assembling radian; the shielding piece (6) is an inner blocking pipe sleeved on the inner wall of the water filtering pipe (3);

a control mechanism (7) for driving the shielding piece (6) to rotate the shielding rotating radian is arranged above the shielding piece (6); a connecting component (8) is connected between the shielding piece (6) and the control mechanism (7); the shielding piece (6) and the control mechanism (7) which are connected by the same connecting component (8) are positioned on different filter pipes (3); the control mechanism (7) comprises a pushing ring (71) through which the connecting component (8) can penetrate; the pushing ring (71) is fixed on the inner wall of the water filtering pipe (3) to avoid the position where the shielding piece (6) is installed;

when strainer (3) rotate when the dismouting radian is installed in adjacent strainer (3) on, drive installation drives corresponding shielding piece (6) and shelters from drainage hole (31) in control mechanism (7) of this strainer (3).

2. Precipitation well according to claim 1, characterized in that: the strainer is provided with at least three sections; connected in the same connecting assembly (8), at least one filter pipe (3) is arranged between the filter pipe (3) where the shielding piece (6) is arranged and the filter pipe (3) where the control mechanism (7) is arranged.

3. Dewatering well according to claim 2, wherein: the same connecting assembly (8) penetrates through at least three filter pipes (3), wherein the control mechanism (7) is fixed on the filter pipe (3) positioned on the upper side of the connecting assembly (8), the shielding piece (6) is arranged on the filter pipe (3) positioned on the lower side of the connecting assembly (8), and an auxiliary ring (64) is arranged on the shielding piece (6) positioned on the inner side of the filter pipe (3) in the middle; the auxiliary ring (64) is sleeved on the connecting component (8); the radian of the connecting assembly (8) rotating around the axial direction of the water filter pipe (3) in the auxiliary ring (64) is not less than the disassembly and assembly radian.

4. Precipitation well according to claim 1, characterized in that: comprises at least two well bodies;

at least one of said well bodies is located in a confined aquifer (12); at least one of the well bodies is located above the confined aquifer (12).

5. Precipitation well according to claim 1, characterized in that: outer connecting rods (42) are connected between the sedimentation pipe (2) and the filter pipes (3) and between adjacent filter pipes (3); the outer connecting rod (42) is abutted against the outer wall of the water filter pipe (3) or the sedimentation pipe (2), and the axial direction of the outer connecting rod (42) is parallel to the axial direction of the water filter pipe (3); the outer walls of the settling pipe (2) and the water filtering pipe (3) are provided with lantern rings (41) for the outer connecting rod (42) to penetrate through; all the outer connecting rods (42) which are positioned in the same axial direction are connected end to end.

6. A precipitation construction method adopting the precipitation well as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following construction steps:

drilling to form a hole, and drilling to form a well hole at the target position; filling mud in the hole in the drilling process;

cleaning holes and changing slurry, after drilling into a target depth, punching a well hole, removing sundries in the hole, and adjusting the density of slurry in the hole;

the lower well pipe comprises a checking sedimentation pipe (2), a water filter pipe (3), a filling and paving bottom material and a mounting well pipe; the inspection sedimentation tube (2) and the strainer (3) comprise: the adjusting shielding piece (6) shields the water filtering holes (31) of the water filtering pipes (3), clay is filled in the water filtering holes (31), and whether the bottom wall of the sedimentation pipe (2) is firmly blocked or not is checked; the paving bottom material comprises: filling and paving aggregate with a certain height at the bottom of the well hole to form a base layer (102); the installation well tubular includes: sequentially connecting adjacent sedimentation pipes (2) or water filter pipes (3) to form a well pipe; a shielding piece (6) in the water filter pipe (3) is connected with a corresponding control mechanism (7) through a connecting component (8), and the control mechanism (7) drives the shielding piece (6) to shield a water filter hole (31) along with the installation of the water filter pipe (3); slowly sinking the well pipe until the bottommost sedimentation pipe (2) sinks to be pressed against the base layer (102);

the filter material (101) is buried, the well pipe is adjusted to enable the axial deviation between the well pipe and the well hole to be within a design range, the filter material (101) is filled between the well pipe and the inner wall of the well hole, and the diameter of the filter material (101) is larger than that of the water filtering hole (31);

after the water is reduced, the pipes are pulled out, and the strainer (3) and the control mechanism (7) which are higher than the ground of the foundation pit are detached in sequence according to the design requirement; when the filter pipes (3) are detached, the control mechanism (7) fixed on the filter pipes (3) is driven to adjust the corresponding shielding parts (63) to avoid the filter holes (31), so that the corresponding filter pipes (3) continue to drop water.

7. The precipitation construction method according to claim 6, wherein: the device also comprises a well washing in the descending water, wherein a shielding piece (6) corresponding to the uppermost strainer (3) is adjusted to separate the shielding piece (6) from the strainer holes (31), so that the strainer holes (31) are communicated with the strainer pipes (3); pumping water by adopting an air compressor, and pumping out water in the precipitation well to clean the precipitation well; and the passage between the water filtering hole (31) and the corresponding aquifer is dredged.

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