Method for improving recharge pressure of recharge well through bag type grouting
By setting up a bag between the refilling well hole and the well pipe and injecting slurry to compact the clay ball, the problem of hydraulic splitting in traditional pressurized refilling technology is solved, and higher refilling pressure and construction safety are achieved .
Patent Information
- Application Number
- CN202411605885.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2024-12-20
AI Technical Summary
In foundation pit engineering, traditional pressurized reinfusion technology can easily lead to hydraulic splitting, resulting in reinfusion water reinfusion, and it is difficult to ensure the reinfusion pressure, limiting its application range.
By setting a capsule bag between the refilling well hole and the well tube and injecting slurry through the grouting tube, the capsule bag is expanded, the clay ball is compacted, and the refilling well hole is sealed, thereby increasing the refilling pressure.
It effectively increases the ultimate reinjection pressure of the reinjection well hole, achieves higher pressure pressurized reinjection, avoids hydraulic splitting, and improves the safety and efficiency of construction.
Smart Images
Figure CN119163107A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pressurized reinjection, and in particular to a method for increasing the reinjection pressure of a reinjection well through bladder grouting. Background Art
[0002] In actual projects, when the foundation pit is too deep or the aquifer is too thick, the depth of the water-stop curtain required to cut off the hydraulic continuity inside and outside the foundation pit is also very large, which makes the construction difficult, the cost high, and the quality of anti-seepage difficult to guarantee. Therefore, in engineering practice, a suspended water-stop curtain is often used. In this case, the water-stop curtain cannot completely cut off the groundwater seepage inside and outside the foundation pit, which leads to the connection of groundwater inside and outside the foundation pit, and then causes the groundwater level outside the pit to drop, and the formation to settle. In addition, the hydrogeological conditions in soft soil areas are complex, and the confined aquifer often forms a layered distribution with the relative impermeable layer between them, and there is often overflow between aquifers. Even if the water-stop curtain cuts off a layer of confined water, when pumping water from this layer, the water head of several layers of aquifers above and below will change due to overflow, causing settlement outside the foundation pit.
[0003] In view of the limitations of traditional groundwater control methods when used in the above-mentioned situations, in recent years, the method of setting up recharge wells near the protected buildings outside the foundation pit has been developed, and measures of artificial recharge of groundwater have been taken for the aquifer outside the foundation pit whose water level has dropped due to precipitation in the foundation pit. The drop in groundwater level outside the foundation pit caused by precipitation in the foundation pit can be effectively controlled, thereby reducing or eliminating the impact of pumping water in the foundation pit, and then being able to control ground subsidence and the resulting settlement of the protected buildings.
[0004] The recharge methods of groundwater recharge wells can be divided into natural recharge relying on the deadweight of the water body and pressure recharge relying on artificial pressure. The water level in the natural recharge well is not higher than the wellhead, and no additional pressure is required, so it is widely used in engineering. Although pressurized recharge can increase the recharge volume of the recharge well, if the pressurization operation is improper or the pressure is too high, it is easy to cause hydraulic fracturing, resulting in the recharge water flowing back along the weak surface of the soil layer, such as along the contact surface between the outer wall of the well pipe and the soil or along the borehole that is not tightly blocked, etc., which makes it less used in actual engineering. Therefore, it is necessary to improve and optimize the pressurized recharge. Summary of the invention
[0005] The object of the present invention is to provide a method for increasing the reinjection pressure of a reinjection well by bladder grouting, so as to solve the technical problems raised in the above-mentioned background technology.
[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A method for increasing the recharging pressure of a recharging well by bladder grouting comprises the following steps: S100, the drilling equipment performs drilling construction of the recharging well hole in the foundation pit, and after the drilling of the recharging well hole is completed, the well pipe is placed inside the recharging well hole, wherein a filter screen is installed in the well pipe; S200, filling filter material between the well pipe and the hole wall of the recharging well hole; S300, after connecting the bladder bag to the bottom of the grouting pipe, the bladder bag and the grouting pipe are lowered between the well pipe and the hole wall of the reinjection well hole, and then clay balls are filled between the well pipe and the hole wall of the reinjection well hole; S400, inject slurry into the bag through the grouting pipe, stop grouting after the bag expands to compact the clay balls on the surrounding side to close the area between the reinjection wellbore and the well pipe, and then perform pressurized reinjection.
[0007] As a preferred solution of the present invention, in step S300, the bag is annular and is sleeved on the outside of the well pipe.
[0008] As a preferred solution of the present invention, the bag is located between the well pipe and the wall of the recharging wellbore at a position corresponding to the water-proof layer of the soil.
[0009] As a preferred solution of the present invention, in the step S400, the bag is retained in the area between the well pipe and the wall of the reinjection wellbore after the grouting is completed, and the grouting pipe is pulled out.
[0010] As a preferred embodiment of the present invention, in step S200, the thickness of the filter is the same as the thickness of the well pipe, and the filter is arranged at a position in the well pipe corresponding to the aquifer area in the soil, and the filter material is filled into the aquifer.
[0011] As a preferred embodiment of the present invention, the clay ball is located in the water-proof layer of the soil.
[0012] As a preferred solution of the present invention, in the step S400, the clay balls adhere to the outer wall of the well pipe and the wall of the reinjection well hole after being squeezed by the bag, and absorb the moisture passing between the well pipe and the reinjection well hole.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges a bag between the well pipe and the wall of the reinjection wellbore, and injects slurry into the bag through a grouting pipe to expand the bag, and the clay balls are squeezed by the bag and compacted, and the reinjection wellbore is completely blocked by the bag and the clay balls, thereby increasing the limit reinjection pressure of the reinjection wellbore and enabling pressurized reinjection at a higher pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0015] Figure 1 The present invention provides a flow chart of a method for increasing the recharging pressure of a recharging well by bladder grouting; Figure 2 The present invention provides a structural schematic diagram of a method for increasing the reinjection pressure of a reinjection well by bladder grouting.
[0016] The numbers in the figure represent the following: 1. Well pipe; 2. Recharge wellbore; 3. Clay ball; 4. Filter material; 5. Filter screen; 6. Water-proof layer; 7. Aquifer; 8. Grouting pipe; 9. Bladder bag. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0018] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.
[0019] like Figure 1 and Figure 2 As shown, the present invention provides a method for increasing the recharging pressure of a recharging well by bladder grouting, comprising the steps of: S100, the drilling equipment performs drilling construction of the recharging well hole 2 in the foundation pit, and after the drilling of the recharging well hole 2 is completed, the well pipe 1 is placed inside the recharging well hole 2, wherein the filter screen 5 is installed in the well pipe 1; S200, and fill the filter material 4 between the well pipe 1 and the hole wall of the recharging well hole 2; S300, after connecting the bag 9 to the bottom of the grouting pipe 8, the bag 9 and the grouting pipe 8 are lowered between the well pipe 1 and the hole wall of the reinjection well hole 2, and then the clay balls 3 are filled between the well pipe 1 and the hole wall of the reinjection well hole 2; S400, inject slurry into the bag 9 through the grouting pipe 8, stop grouting after the bag 9 expands to compact the clay balls 3 on the surrounding side to close the area between the reinjection wellbore 2 and the well pipe 1, and then perform pressurized reinjection.
[0020] In actual application, the present application is constructed by drilling equipment such as a drilling rig to construct the reinjection wellbore 2. After the construction is completed, the filter screen 5 is installed in the well pipe 1, and then the well pipe 1 is placed in the reinjection wellbore 2 for installation, and then the filter material 4 is filled between the well pipe 1 and the hole wall of the reinjection wellbore 2. After the bag 9 and the grouting pipe 8 are placed between the well pipe 1 and the hole wall of the reinjection wellbore 2, the clay balls 3 are filled in the remaining area between the well pipe 1 and the hole wall of the reinjection wellbore 2. The grouting pipe 8 injects slurry into the bag 9, and the bag 9 expands due to the injection of the slurry, thereby compacting the clay balls 3 on the surrounding side, and the reinjection wellbore 2 is sealed together with the compacted clay balls 3 and the bag 9. After being compacted, the clay balls 3 can withstand greater pressure, thereby increasing the ultimate reinjection pressure of the reinjection wellbore 2, and pressurized reinjection with greater pressure can be performed.
[0021] In this embodiment, the filter material 4 is generally selected from medium-coarse sand, which is used to perform preliminary filtration on the water in the reinjection wellbore 2 to prevent larger impurities in the water from entering the area between the well pipe 1 and the reinjection wellbore 2 .
[0022] In step S300 , the bag 9 is annular and is sleeved on the outside of the well pipe 1 .
[0023] The annular bladder bag 9 can wrap the well pipe 1 so that the bladder bag 9 can squeeze the clay balls 3 around the well pipe 1 after expansion, thereby sealing the space between the well pipe 1 and the reinjection wellbore 2 together with the compacted clay balls 3 .
[0024] The bag 9 is located between the well pipe 1 and the wall of the recharging well hole 2 at a position corresponding to the water-proof layer 6 of the soil.
[0025] In step S400, the bag 9 is left in the area between the well pipe 1 and the wall of the reinjection wellbore 2 after the grouting is completed, and the grouting pipe 8 is pulled out.
[0026] After the construction is completed, the bag 9 remains in the area between the well pipe 1 and the reinjection wellbore 2. No additional treatment is required, and only the grouting pipe 8 needs to be pulled out, which improves the convenience of construction.
[0027] In step S200 , the thickness of the filter screen 5 is the same as that of the well pipe 1 , and the filter screen 5 is arranged at a position in the well pipe 1 corresponding to the area of the aquifer 7 in the soil, and the filter material 4 is filled into the aquifer 7 .
[0028] The clay ball 3 is located within the water-proof layer 6 of the soil.
[0029] In step S400 , the clay balls 3 adhere to the outer wall of the well pipe 1 and the wall of the reinjection well hole 2 after being squeezed by the bag 9 , and absorb the moisture passing between the well pipe 1 and the reinjection well hole 2 .
[0030] The clay ball 3 can absorb water, so that the clay ball 3 expands, so that the clay ball 3 can not only absorb water to play a role of water isolation, but also improve the compactness of the soil at the weak surface of the recharging wellbore 2.
[0031] In this embodiment, the aquiclude 6 and the aquifer 7 are different regions in the soil in the up and down directions. Water is difficult to flow in the aquiclude 6, and the water has a small permeability coefficient and poor permeability. In the aquifer 7, the water has strong permeability.
[0032] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.
[0033] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.
Claims
1. A method for increasing the recharging pressure of a recharging well by bladder grouting, characterized in that: Includes steps: S100, the drilling equipment performs drilling construction of the reinjection well hole (2) in the foundation pit, and after the drilling of the reinjection well hole (2) is completed, the well pipe (1) is placed inside the reinjection well hole (2), wherein a filter screen (5) is installed in the well pipe (1); S200, filling filter material (4) between the well pipe (1) and the hole wall of the recharging well hole (2); S300, after connecting the bag (9) to the bottom of the grouting pipe (8), the bag (9) together with the grouting pipe (8) is lowered between the well pipe (1) and the wall of the reinjection well hole (2), and then clay balls (3) are filled between the well pipe (1) and the wall of the reinjection well hole (2); S400, grout is injected into the bag (9) through the grouting pipe (8), and the grouting is stopped after the bag (9) expands to compact the clay balls (3) on the surrounding side to the area between the closed reinjection wellbore (2) and the well pipe (1), and then pressurized reinjection is performed.
2. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: In the step S300, the bag (9) is annular and is sleeved on the outside of the well pipe (1).
3. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: The bag (9) is located between the well pipe (1) and the wall of the recharging wellbore (2) at a position corresponding to the water-proof layer (6) of the soil.
4. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: In the step S400, the bag (9) is retained in the area between the well pipe (1) and the wall of the reinjection wellbore (2) after the grouting is completed, and the grouting pipe (8) is withdrawn.
5. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: In step S200, the thickness of the filter screen (5) is the same as the thickness of the well pipe (1), and the filter screen (5) is arranged at a position in the well pipe (1) corresponding to the area of the aquifer (7) in the soil, and the filter material (4) is filled into the aquifer (7).
6. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: The clay ball (3) is located in the water-proof layer (6) of the soil.
7. A method for increasing the recharging pressure of a recharging well by bladder grouting according to claim 1, characterized in that: In the step S400, the clay ball (3) is pressed by the bag (9) to adhere to the outer wall of the well pipe (1) and the hole wall of the reinjection well hole (2), and absorbs moisture passing between the well pipe (1) and the reinjection well hole (2).