A construction technology of a precipitation well

Abstract

This application relates to a construction process for dewatering wells, falling within the field of engineering construction. The process includes determining the well location, installing a drilling rig at the well location, drilling a hole at the well location using the drilling rig, cleaning the hole and replacing the slurry, lowering a sedimentation pipe into the hole, filling the space between the sedimentation pipe and the well wall with filter material, sealing the wellhead and the outer ring of the sedimentation pipe with clay balls, and cleaning the bottom of the well. This application provides more standardized control over the hole cleaning and slurry replacement process, thereby reducing engineering risks.

Description

Technical Field

[0001] This application relates to the field of engineering construction, and in particular to a dewatering well construction process. Background Technology

[0002] In many fields such as building construction and underground engineering, dewatering is a crucial step. The construction quality and efficiency of dewatering wells, as a key component of dewatering operations, directly impact the progress and safety of the entire project.

[0003] In traditional dewatering well construction, well location is typically determined manually by measurement and marking, based on design drawings and the site's topography. Drilling is usually carried out using drilling rigs, following standard drilling parameters; hole cleaning and mud replacement are often simply performed by flushing.

[0004] However, traditional dewatering well construction techniques have many shortcomings. During the cleaning and slurry replacement process, the dewatering well is usually flushed directly with water. This method lacks sufficient precision and standardization in controlling the cleaning and slurry replacement process, which can easily lead to unstable construction quality and increase project risks. Summary of the Invention

[0005] In order to more effectively control the hole cleaning and slurry replacement process and reduce engineering risks, this application provides a dewatering well construction process.

[0006] The construction process for dewatering wells provided in this application adopts the following technical solution: A dewatering well construction process includes the following steps: S1: Determine well location; S2: Install the drilling rig at the well location; S3: Drilling is carried out at the well location using a drilling rig; S4: Hole cleaning and pulp replacement: After drilling to the design elevation, before lifting the drill, raise the drill rod to 0.50m from the bottom of the hole for flushing to remove debris from the hole. At the same time, gradually adjust the mud density in the hole to close to 1.05, until the sediment at the bottom of the hole is less than 30cm and the returned mud does not contain mud lumps. S5: Lower the sedimentation tube into the borehole; S6: Fill the space between the sedimentation tube and the well wall with filter media; S7: Seal the wellhead and the outer ring of the sedimentation pipe with clay balls; S8: Clean the bottom of the well.

[0007] By adopting the above technical solution, in the hole cleaning and mud replacement step, after drilling to the design elevation, the drill rod is raised to 0.50m from the bottom of the hole for flushing, which can effectively remove debris in the hole. At the same time, the mud density in the hole is gradually adjusted to close to 1.05, so that the sediment at the bottom of the hole is less than 30cm and the returned mud does not contain mud lumps. This more standardized control of the hole cleaning and mud replacement process reduces the engineering risks caused by excessive debris in the hole, unsuitable mud density, or excessive sediment.

[0008] Optionally, in S6, a trolley is used to fill the filter media between the sedimentation pipe and the well wall, the trolley comprising: Support base; The vehicle body has an open top, and one of its bottom edges is a mounting edge. The mounting edge is rotatably connected to the support base via a first rotating shaft. Both the first rotating shaft and the mounting edge are parallel to a first direction. The vehicle body has a discharge port above the mounting edge. In addition, a first linear drive member with a driving direction perpendicular to the first direction, one end of the first linear drive member being hinged to the support base around the first axis, and the other end being hinged to the vehicle body around the second axis.

[0009] By adopting the above technical solution, when the first linear drive is started, the car body can be driven to rotate around the first rotating shaft, so that the filter material can flow out smoothly from the outlet of the car body, achieving the purpose of filling the filter material between the sedimentation pipe and the well wall. The operation is simple and the efficiency of filter material filling is improved.

[0010] Optionally, the cart further includes: The base, the support seat is rotatably connected above the base about a third axis, the third axis being parallel to the second direction.

[0011] By adopting the above technical solution, the support seat of the trolley is rotatably connected to the base above the third axis, so that the trolley can rotate at a certain angle in the horizontal direction, which facilitates the adjustment of the discharge position.

[0012] Optionally, the cart further includes: Multiple wheels are attached to the bottom of the base.

[0013] By adopting the above technical solution, the wheel design facilitates the movement of the cart, allowing construction workers to easily move the cart to the location where filter material needs to be filled.

[0014] Optionally, the cart further includes: An armrest is fixedly connected to the base, with the top of the armrest located above the support base.

[0015] By adopting the above technical solution, the handrail is fixedly connected to the base and the top is located above the support seat, which makes it convenient for construction workers to hold and allows them to easily push the cart forward, backward or turn, making the operation more flexible and convenient.

[0016] Optionally, the trolley further includes a discharge assembly, the discharge assembly comprising: A flexible sleeve, one end of which is fixedly connected to the vehicle body, and the discharge port is located on the inner circumference of the flexible sleeve, and the flexible sleeve communicates with the vehicle body through the discharge port.

[0017] By adopting the above technical solution, one end of the flexible sleeve is fixedly connected to the vehicle body and the discharge port is located on its inner circumference and connected to the vehicle body, which can prevent the filter material from scattering during unloading.

[0018] Optionally, the discharge assembly further includes: A guide strip, the length of which is perpendicular to the first rotating shaft; one end of the guide strip is connected to the vehicle body, the connection between the guide strip and the vehicle body is located below the discharge port, and the flexible sleeve overlaps the upper surface of the guide strip.

[0019] By adopting the above technical solution, the guide strip supports and guides the flexible sleeve, allowing the filter material to flow out more smoothly.

[0020] Optionally, the guide strip is hinged to the vehicle body around a fourth axis, the fourth axis being parallel to the first direction and located on the side of the mounting edge; The discharge assembly also includes: A first motor is connected between the vehicle body and the guide bar to drive the guide bar to rotate about a fourth axis.

[0021] By adopting the above technical solution, the first motor drives the guide bar to rotate around the fourth axis, which can adjust the discharge direction and range of the filter material.

[0022] Optionally, the discharge assembly further includes: Multiple tensioning arches are connected to the guide strip, and the multiple tensioning arches are spaced apart along the length of the guide strip; the tensioning arches are arched with their openings facing the guide strip, and the flexible sleeve is located between the tensioning arches and the guide strip, and the flexible sleeve is fixedly connected to the tensioning arches.

[0023] By adopting the above technical solution, the tensioned arch frame can keep the flexible sleeve open, ensuring that the filter material flows out smoothly.

[0024] Optionally, the guide bar has slots for inserting the two arch legs of the tensioning arch frame.

[0025] By adopting the above technical solution, the slots on the guide strip facilitate the installation and disassembly of the tensioned arch frame.

[0026] In summary, this application includes at least one of the following beneficial technical effects: During hole cleaning and mud replacement, the drill rod is raised to 0.50m from the bottom of the hole for flushing, which can remove debris from the hole and gradually adjust the mud density in the hole to close to 1.05, so that the sediment at the bottom of the hole is less than 30cm and the returned mud does not contain mud lumps. This improves the accuracy and standardization of the hole cleaning and mud replacement process, ensures stable construction quality, and reduces project risks. The cart's box can rotate around the first pivot, facilitating unloading and allowing the filter media to flow smoothly from the outlet, thus improving the efficiency of filling the filter media. The trolley's support base can rotate around a third axis, and it is equipped with wheels at the bottom, making it easy to adjust the discharge position. Construction workers can easily move the trolley to the location where filter material needs to be filled, making the operation more flexible and convenient. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the cart in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the box in the embodiment of this application; Figure 3 This is a schematic diagram of the structure of the discharge component in the embodiments of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Trolley; 11. Support base; 111. Hinge base; 12. Carriage box; 121. Mounting edge; 122. Discharge port; 13. First linear drive component; 14. Base; 141. Traveling wheel; 142. Second motor; 15. Handrail; 16. Discharge assembly; 161. Flexible sleeve; 162. Guide bar; 1621. Slot; 163. First motor; 164. Tensioning arch frame. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail. For ease of description, this application introduces directional terms such as first direction, second direction, and third direction to form a three-dimensional reference direction. The directional terms used, such as "first direction, second direction, and third direction", can be specifically referred to in the figure, where X represents the first direction, Y represents the second direction, and Z represents the third direction. The first direction, second direction, and third direction are perpendicular to each other. In this application, the second direction is the vertical direction.

[0030] This application discloses a construction process for dewatering wells. The construction process for dewatering wells includes the following steps: S1: Determine well location: The well locations are marked out according to the well location plan. If obstacles (such as pile locations) are encountered during on-site construction or if the construction conditions affect the site, appropriate adjustments can be made. Construction personnel can use surveying instruments, such as total stations and levels, to accurately determine the well locations based on the design drawings and the site topography.

[0031] S2: Install the drilling rig to the well location: During installation, the drilling rig platform should be installed securely, and the drilling rig's hook should be aligned with the center of the well location's positioning hole. The hook, rotary table, and the center of the well location's positioning hole should form a perpendicular line.

[0032] S3: Drilling is carried out at the well site using a drilling rig: The borehole diameter for dewatering wells is φ450mm, drilled to the bottom in one continuous borehole. When the mixed well drilling reaches the designed depth, drill an additional 0.3-0.5m. Maintain accurate drilling records. If discrepancies are found between the actual geological conditions and the data provided during the exploration phase, promptly notify the designers and adjust the well structure accordingly to ensure the filter pipe's placement allows for effective water intake. When drilling the borehole, tighten the hook wire rope and rotate slowly with light pressure. Ensure the drilling rig is level to guarantee the borehole's verticality (less than 1%). Use natural mud preparation within the borehole. Maintain the mud's specific gravity between 1.15 and 1.20 during drilling. When lifting the drill string or stopping work, the borehole must be filled with mud to prevent borehole collapse.

[0033] S4: Hole cleaning and pulp replacement: The cleaning and mud replacement work before running the well casing is a key process to ensure the quality of well completion. In order to prevent the formation of excessively thick mud cake in the aquifer area during drilling, clean water is added to adjust the mud when the borehole reaches the top plate of the aquifer. After drilling to the design elevation, the drill rod is raised to 0.50m from the bottom of the hole before lifting the drill string to flush the hole, remove debris, and gradually adjust the mud density in the hole to close to 1.05, until the sediment at the bottom of the hole is less than 30cm and the returned mud does not contain mud lumps. S5: Lower the sedimentation tube into the borehole: After drilling, the casing should be lowered immediately to prevent well collapse. The selected sedimentation casing should be sturdy, crack-free, and sand-free. During lowering, use a crane or similar equipment to lift the casing and slowly lower it into the borehole. Ensure the casing is vertical during lowering to avoid collisions with the borehole wall. After lowering to the designed position, the casing should protrude approximately 50cm above the surface.

[0034] S6: Fill the space between the sedimentation tube and the well wall with filter media: Use a trolley 1 to fill the filter material between the sedimentation pipe and the well wall; the height of the filler should be measured and recorded during the gravel filling process; the gravel filling process should also be carried out continuously and should not be interrupted until the gravel is lowered into the predetermined position.

[0035] S7: Seal the wellhead and the outer ring of the settling pipe with clay balls: Construction workers filled the gap between the wellhead and the outer ring of the sedimentation pipe one by one with clay balls, ensuring a tight seal to prevent groundwater leakage. To prevent bridging during the filling process, the clay must be crushed (particle size preferably less than 3cm) before filling. The speed and quantity of clay balls should be controlled during filling, following the principle of "lower and slower" around the well pipe. Finally, the wellhead pipe was sealed properly.

[0036] S8: Clean the bottom of the well: Well washing should be carried out immediately after the well casing is installed and the filter material is filled, and should be done in one go to avoid the mud film on the wall gradually aging and becoming difficult to break, thus affecting the water seepage effect. Well washing can be carried out by blowing out the sediment at the bottom of the pipe with an air compressor until the water is clear and free of sand.

[0037] Reference Figure 1 and Figure 2 In S6, a trolley 1 is used to fill the filter material between the sedimentation pipe and the well wall. The trolley 1 includes a support base 11, a carriage 12, and a first linear drive component 13. The top of the carriage 12 is open, and one of the bottom edges of the carriage 12 is a mounting edge 121. The mounting edge 121 of the carriage 12 is rotatably connected to the support base 11 via a first rotating shaft. Both the first rotating shaft and the mounting edge 121 are parallel to a first direction. To install the first rotating shaft, two hinge seats 111 are fixedly connected to the support base 11. The first rotating shaft is rotatably connected to the top of the hinge seats 111, and the carriage 12 is supported to the point of suspension by the hinge seats 111. The carriage 12 is mounted on the mounting edge 121. A discharge port 122 is provided above 21; the driving direction of the first linear drive member 13 is perpendicular to the first direction, one end of the first linear drive member 13 is hinged to the support base 11 around the first axis, and the other end is hinged to the carriage 12 around the second axis; the first axis, the second axis and the first rotating shaft are respectively located at the three vertices of the triangle; in this embodiment, the first linear drive member 13 is a cylinder, the cylinder body of the first linear drive member 13 is hinged to the support base 11, and the piston rod is hinged to the carriage 12; when unloading is required, the first linear drive member 13 is activated, pushing the sliding block to make the carriage 12 rotate around the first rotating shaft, and the filter material flows out from the discharge port 122.

[0038] Reference Figure 1The trolley 1 also includes a base 14, wheels 141, and a handle 15 fixedly connected to the base 14. A support base 11 is rotatably connected above the base 14 around a third axis, which is parallel to a second direction, which is vertical. This allows the trolley 1 to rotate at a certain angle in the horizontal direction, facilitating adjustment of the discharge position. To drive the support base 11 to rotate around the third axis, a second motor 142 is fixedly connected to the top wall of the base 14. The support base 11 is fixedly connected to the output shaft of the motor, so that the second motor 142 drives the support base 11 to rotate around the third axis. Multiple wheels 141 are fixedly installed at the bottom of the base 14 with screws. The wheels 141 are casters, which facilitate the movement of the trolley 1. Construction personnel can easily move the trolley 1 to the position where filter material needs to be filled. The top of the handle 15 is located above the support base 11 for easy gripping. Construction personnel can use the handle 15 to push the trolley 1 forward, backward, or turn, making operation more flexible and convenient.

[0039] Reference Figure 1 and Figure 3 In some embodiments of this application, the trolley 1 further includes a discharge assembly 16, which includes a flexible sleeve 161, a guide strip 162, a first motor 163, and multiple tensioning arches 164. One end of the flexible sleeve 161 is fixedly connected to the carriage 12, and the discharge port 122 is located on the inner circumference of the flexible sleeve 161. The flexible sleeve 161 communicates with the carriage 12 through the discharge port 122. In this way, when unloading, the other end of the flexible sleeve 161 can be placed above the sedimentation pipe and the well wall, and the filter material can flow out through the flexible sleeve 161, avoiding the filter material from scattering. The length of the guide strip 162 is perpendicular to the first rotating shaft; one end of the guide strip 162 is connected to the carriage 12, and the connection between the guide strip 162 and the carriage 12 is located below the discharge port 122; the flexible sleeve 161 overlaps the upper surface of the guide strip 162; the guide strip 162 can support and guide the flexible sleeve 161, so that the filter material can flow out more smoothly; The guide bar 162 is hinged to the carriage 12 around a fourth axis, which is parallel to the first direction and located on the side of the mounting edge 121. A first motor 163 is connected between the carriage 12 and the guide bar 162 to drive the guide bar 162 to rotate around the fourth axis. Specifically, the housing of the first motor 163 is fixedly connected to the carriage 12, and the output shaft of the first motor 163 is fixedly connected to the guide bar 162. By controlling the rotation angle of the guide bar 162 through the first motor 163, the discharge direction and range of the filter material can be adjusted. Tensioning arches 164 are connected to guide bars 162, and multiple tensioning arches 164 are spaced apart along the length of guide bars 162. The tensioning arches 164 are arched with their openings facing the guide bars 162. A flexible sleeve 161 is located between the tensioning arches 164 and the guide bars 162, and the flexible sleeve 161 is fixedly connected to the tensioning arches 164. The connection method can be that a collar is fixedly connected to the outside of the flexible sleeve 161, and the collar is fitted onto the tensioning arches 164. The tensioning arches 164 can keep the flexible sleeves 161 in an open state to ensure the smooth flow of filter media. In order to facilitate the replacement of the arches and the flexible sleeves 161, slots 1621 are provided on the upper surface of the guide bars 162 for the insertion of two arch feet of the tensioning arches 164, so as to facilitate the installation and disassembly of the tensioning arches 164.

[0040] The operation and principle of the trolley 1 are as follows: The operator holds the handle 15 and moves the trolley 1 to the location where filter material needs to be filled using the wheels 141. Since the wheels 141 are casters, they are flexible and easy for the operator to maneuver. Upon reaching the designated position, the second motor 142, fixedly connected to the top wall of the base 14, is activated based on the positional relationship between the sedimentation pipe and the well wall. This drives the support base 11 to rotate around the third axis, precisely adjusting the discharge direction of the trolley 1. The other end of the flexible sleeve 161 is placed above the sedimentation pipe and the well wall. When unloading is required, the first linear drive 13 is activated, pushing the carriage 12 to rotate around the first axis. The filter material flows out from the outlet 122 and fills the space between the sedimentation pipe and the well wall through the flexible sleeve 161. During unloading, the guide strip 162 supports and guides the flexible sleeve 161, while the tensioned arch 164 keeps the flexible sleeve 161 open, ensuring smooth discharge of the filter material. Meanwhile, the guide bar 162 can be rotated around the fourth axis by the first motor 163 to adjust the discharge direction and range of the filter material.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction process for a dewatering well, characterized in that, Includes the following steps: S1: Determine well location; S2: Install the drilling rig at the well location; S3: Drilling is carried out at the well location using a drilling rig; S4: Hole cleaning and pulp replacement: After drilling to the design elevation, before lifting the drill, raise the drill rod to 0.50m from the bottom of the hole for flushing to remove debris from the hole. At the same time, gradually adjust the mud density in the hole to close to 1.05, until the sediment at the bottom of the hole is less than 30cm and the returned mud does not contain mud lumps. S5: Lower the sedimentation tube into the borehole; S6: Fill the space between the sedimentation tube and the well wall with filter media; S7: Seal the wellhead and the outer ring of the sedimentation pipe with clay balls; S8: Clean the bottom of the well.

2. The construction process for a dewatering well according to claim 1, characterized in that, In S6, a trolley (1) is used to fill the filter media between the sedimentation tube and the well wall. The trolley (1) includes: Support base (11); The top of the carriage (12) is open. One of the bottom edges of the carriage (12) is a mounting edge (121). The mounting edge (121) of the carriage (12) is rotatably connected to the support base (11) through a first rotating shaft. The first rotating shaft and the mounting edge (121) are both parallel to a first direction. The carriage (12) has a discharge port (122) above the mounting edge (121). In addition, a first linear drive member (13) with a driving direction perpendicular to the first direction, one end of the first linear drive member (13) is hinged to the support base (11) around the first axis, and the other end is hinged to the vehicle body (12) around the second axis.

3. The construction process for a dewatering well according to claim 2, characterized in that, The trolley (1) also includes: The base (14) is rotatably connected above the support (11) about a third axis, which is parallel to the second direction.

4. The construction process for a dewatering well according to claim 3, characterized in that, The trolley (1) also includes: Multiple wheels (141) are connected to the bottom of the base (14).

5. The construction process for a dewatering well according to claim 4, characterized in that, The trolley (1) also includes: A handrail (15) is fixedly connected to the base (14), with the top of the handrail (15) located above the support (11).

6. A dewatering well construction process according to any one of claims 2-5, characterized in that, The trolley (1) further includes a discharge assembly (16), which includes: A flexible sleeve (161) is fixedly connected at one end to the vehicle body (12). The discharge port (122) is located on the inner periphery of the flexible sleeve (161). The flexible sleeve (161) is connected to the vehicle body (12) through the discharge port (122).

7. The construction process for a dewatering well according to claim 6, characterized in that, The discharge assembly (16) also includes: A guide strip (162) is perpendicular to the first rotating shaft in the length direction; one end of the guide strip (162) is connected to the car body (12), and the connection between the guide strip (162) and the car body (12) is located below the discharge port (122); the flexible sleeve (161) overlaps the upper surface of the guide strip (162).

8. The construction process for a dewatering well according to claim 7, characterized in that, The guide strip (162) is hinged to the vehicle body (12) around a fourth axis, which is parallel to the first direction and located on the side of the mounting edge (121). The discharge assembly (16) also includes: A first motor (163) is connected between the vehicle body (12) and the guide bar (162) to drive the guide bar (162) to rotate about a fourth axis.

9. The construction process for a dewatering well according to claim 8, characterized in that, The discharge assembly (16) also includes: Multiple tensioning arches (164) are connected to the guide strip (162), and the multiple tensioning arches (164) are spaced apart along the length of the guide strip (162); the tensioning arches (164) are arched with their openings facing the guide strip (162), and the flexible sleeve (161) is located between the tensioning arches (164) and the guide strip (162), and the flexible sleeve (161) is fixedly connected to the tensioning arches (164).

10. The construction process for a dewatering well according to claim 9, characterized in that, The guide bar (162) has slots (1621) for inserting the two arch legs of the tensioning arch frame (164).

Images