A high-position mud water tank device for a circulating drilling rig and a construction method thereof

Abstract

The present invention relates to a high-level mud water tank device for a circulation drilling rig and a construction method, comprising a wall protection mud and a low-level water tank and a high-level water tank arranged one high and one low, the low-level water tank and the high-level water tank both comprising a box body, a coarse filter screen and a fine filter screen, the box body is sequentially installed with a coarse filter screen and a fine filter screen from bottom to top, a discharge pipe is arranged at the bottom of the box body, a discharge gate valve is installed on the discharge pipe, a conveying pipeline is connected to the bottom of the low-level water tank, one end of the conveying pipeline is inserted into the wall protection mud, a first valve is installed on the conveying pipeline, a water delivery pipeline is installed between the top of the low-level water tank and the bottom of the high-level water tank, a second valve is installed on the water delivery pipeline, and a connecting pipeline is installed on the top of the high-level water tank. The present invention adopts the high-level mud water tank device to replace the sedimentation tank, so that the drilling rig mechanical equipment is more modularized, the operating difficulty of the drilling rig supporting machinery is reduced, the requirements of the drilling rig equipment on the terrain are reduced, and the setting of the drilling rig is further simplified.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering pile foundation mechanical equipment construction, in particular to a high-position mud water tank device for a circulation drilling rig and a construction method. Background Art

[0002] At present, in the process of municipal engineering pile foundation construction, circulation drilling rigs are often used for mechanical ground drilling. The circulation drilling rig adopts mechanical transmission to rotate the turntable parallel to the ground, and drives the drill bit to rotate and cut the soil or rock layer through the drill rod. The mud is used as the medium to remove the drill cuttings from the ground. The circulation drilling rig is divided into positive circulation rotary drilling rig and reverse circulation rotary drilling rig.

[0003] Both forward and reverse circulation drilling rigs require a mud sedimentation tank to settle the drilling cuttings and then return the mud to complete the mud circulation. Ordinary circulation drilling rigs do not take into account the complexity and limitations of the construction site. The natural conditions and site size of many sites are not suitable for setting up a mud sedimentation tank. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-position mud water tank device and a construction method for a circulating drilling rig. In order to meet the site requirements and achieve the effect of mud circulation, a high-position mud water tank device is set up instead of a sedimentation tank, so that the drilling rig mechanical equipment is more modular, the operating difficulty of the drilling rig's supporting machinery is reduced, the requirements of the drilling rig equipment on the terrain are lowered, and the setting of the drilling rig is further simplified.

[0005] The technical solution adopted by the present invention to solve its technical problems is: to provide a high-level mud water tank device for a circulating drilling rig, including wall protection mud and a low-level water tank and a high-level water tank arranged one high and one low, the low-level water tank and the high-level water tank both include a box body, a coarse filter screen and a fine filter screen, the coarse filter screen and the fine filter screen are installed in sequence from bottom to top inside the box body, a discharge pipe is arranged at the bottom of the box body, a discharge gate valve is installed on the discharge pipe, a conveying pipeline is connected to the bottom of the low-level water tank, one end of the conveying pipeline is inserted into the wall protection mud, a first valve is installed on the conveying pipeline, a water supply pipeline is installed between the top of the low-level water tank and the bottom of the high-level water tank, a second valve is installed on the water supply pipeline, and a connecting pipeline is installed at the top of the high-level water tank.

[0006] As a supplement to the technical solution described in the present invention, the spacing between the coarse filter and the fine filter ranges from 80 to 120 mm.

[0007] As a supplement to the technical solution described in the present invention, an overflow trumpet is installed on the top of each box.

[0008] As a supplement to the technical solution described in the present invention, the diameter of the water supply pipeline is greater than 300 mm.

[0009] As a supplement to the technical solution described in the present invention, the box body is made of stainless steel.

[0010] As a supplement to the technical solution described in the present invention, a positive circulation drilling rig is also included. A vacuum pump, a mud pump and a third valve are installed in sequence on the transport pipeline from the first valve to the low-level water tank, and the connecting pipeline is connected to the positive circulation drilling rig.

[0011] As a supplement to the technical solution described in the present invention, it also includes a reverse circulation drilling rig, the connecting pipeline is connected to the reverse circulation drilling rig, and a fourth valve, a vacuum pump and a fifth valve are installed on the connecting pipeline in sequence from the high-level water tank to the reverse circulation drilling rig.

[0012] As a supplement to the technical solution described in the present invention, a water tank bracket is provided at the bottom of the low-level water tank and the bottom of the high-level water tank.

[0013] As a supplement to the technical solution of the present invention, a construction method of a high-position mud water tank device for a circulating drilling rig is provided, and the specific operation steps are as follows:

[0014] Step 1: Layout and positioning: Use a total station to lay out the lines on site according to the plan. After determining the positions of the drilling holes and water tank brackets, mark them on site. The on-site layout should be reviewed 1 to 2 times.

[0015] Step 2: Bury casing: The top surface of the casing is 2m higher than the construction water level or groundwater level, and 0.3m higher than the construction ground;

[0016] Step 3, drilling rig in place: set up low-level water tank and high-level water tank at the water tank bracket layout point, and arrange the drilling rig position reasonably according to the drilling hole position;

[0017] Step 4, drilling: before drilling, check the verticality of the drill pile, and control the drilling speed according to the mud supply situation; keep the drill stable. If there are inclined holes, collapsed holes, slurry around the casing, instability and other phenomena during the drilling process, stop drilling first, and take corresponding measures to eliminate the problems before drilling again; measures to be taken: 1. Inclined hole: stop drilling and correct the verticality of the drill pile; 2. Collapsed hole: find out the cause of the collapse and measure the moisture content of the soil layer. If the soil foundation is not properly treated, the foundation should be treated first, and the drilling construction can be carried out only after the foundation soil meets the construction requirements; 3. Slurry around the casing: check whether the casing installation meets the requirements and control the amount of mud;

[0018] Step 5, first hole cleaning: clean the drilling debris in the hole, check the mud density, discharge the waste mud and drilling debris in the water tank through the drain pipe, and pile up the waste mud and drilling debris. After treatment, transport them to the designated place for discharge and do not discard them at will. The relative density of the mud after the first hole cleaning is about 1.40;

[0019] Step 6: Hang the steel cage: A certain distance should be left between the steel cage and the hole wall to ensure that the thickness of the protective layer meets the standard requirements. A protective layer pad should be left at the bottom of the steel cage, and the strength of the pad should not be lower than the strength of the concrete after pouring.

[0020] Step 7, lowering the transport pipeline: the bottom of the transport pipeline should be submerged 1.0m below the concrete pouring surface;

[0021] Step 8, second hole cleaning: the relative density of the mud after hole cleaning should be less than 1.10, the sand content should not be greater than 2%; the viscosity should not be greater than 20Pa*s;

[0022] Step 9, pouring concrete: Before pouring, check whether the thickness of the sediment at the bottom of the hole meets the design requirements. If the design does not require it, the sediment thickness of the end-bearing pile shall not exceed 100mm, and the sediment thickness of the friction pile shall not exceed 300mm. The pouring of concrete shall be carried out continuously.

[0023] Beneficial effects: The present invention relates to a high-position mud water tank device for a circulating drilling rig and a construction method, which improves the land occupation problem of the sedimentation tank during the operation of the circulating drilling rig, and there is no need to excavate the sedimentation tank; the water tank device can be recycled, and the mud can directly enter the next pile foundation construction with the water tank, and the mud is not exposed to the site, which is beneficial to environmental protection and reduces the pollution of the mud to the site; the water tank device is a supporting equipment for the circulating drilling rig, which can be disassembled and transported within the site, making the construction more modular and optimizing the construction process of the circulating drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram corresponding to the positive circulation drilling rig of the present invention;

[0025] Figure 2 is a cross-sectional view of the low-level water tank of the present invention;

[0026] Figure 3 is a cross-sectional view of the high-level water tank of the present invention;

[0027] Figure 4 It is a structural schematic diagram corresponding to the reverse circulation drilling rig of the present invention;

[0028] Figure 5 It is a parameter table of the HF circulation drilling rig of the present invention;

[0029] Figure 6 It is a performance parameter table of the NL mud pump of the present invention.

[0030] Diagram: 1. Wall protection mud, 2. First valve, 3. Vacuum pump, 4. Mud pump, 5. Third valve, 6. Discharge gate valve, 7. Discharge pipe, 8. Coarse filter, 9. Fine filter, 10. Overflow trumpet, 11. Positive circulation drilling rig, 12. Water tank bracket, 13. Transport pipeline, 14. Water pipeline, 15. Low-level water tank, 16. High-level water tank, 17. Second valve, 18. Connecting pipeline, 19. Reverse circulation drilling rig, 20. Fourth valve, 21. Fifth valve. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0032] The embodiments of the present invention relate to a high-position mud water tank device and a construction method for a circulating drilling rig, such as Figure 1-6 As shown, the construction process is: layout and positioning → burying casing → drilling rig in place → drilling → first hole cleaning → hanging steel cage → lowering guide tube → second hole cleaning → pouring concrete.

[0033] Drilling rig selection: Since there are many types of circulating drilling rigs and their applicable areas are different, combined with the actual project situation, it is recommended to use a vehicle-mounted circulating drilling rig. The vehicle-mounted circulating drilling rig is an electric rotary drilling rig, and is an ideal hole-forming machine for bored piles. The drilling rig is highly usable and suitable for a wide range of strata, including silt, clay, gravel layers, weathered rock shale, and more suitable for foundation construction in complex strata such as gravel layers. Therefore, it is an ideal equipment for the construction of large and small caliber deep foundation projects such as bridges, buildings, water conservancy, electricity, telecommunications, and engineering precipitation. Taking the HF reverse circulation drilling rig as an example, in actual use, the drilling rig selection should be based on the local geological environment, soil layer structure, drilling rig parameters, etc. HF circulating drilling rig parameters are as follows: Figure 5 shown.

[0034] Mud pump selection: The selection of the pump is mainly based on three parameters: head, flow rate, and power. In addition, the performance curve of the pump is compared with the flow rate and head to analyze whether the performance curve is in the high efficiency section. If it is in the high efficiency section, the pump type is suitable. Otherwise, reselect the pump based on the flow rate and head. Combined with the performance parameters of the HF reverse circulation drilling rig, it is recommended to use the NL mud pump. The performance parameters of the pump are as follows: Figure 6 shown.

[0035] The pump head should not only be sufficient to pump mud from the bottom of the hole to the ground, but also ensure that there is residual head to circulate the mud when the mud is pumped out of the ground. The residual head should not be less than 10mH 2 O.

[0036] Water tank parameters: The drill cuttings sedimentation tank is conditionally replaced with a high-level mud water tank device. The present invention is suitable for circulating bored pile foundations with small borehole diameters and shallow depths. Two water tanks are set up, and the tank body is made of stainless steel for easy recycling; two stainless steel filter screens are set up in the tank body, and the filter screen spacing should be greater than 80-120mm; the water pipe 14 between the water tanks should have a pipe diameter greater than 300mm to avoid pipe blockage; a gravel pump is set up in the borehole to extract mud and drill cuttings, and the mud pump should meet the selection requirements, and the gravel pump water intake should be greater than 0.5m below the water surface; the water tank is fixed in the air by a water tank bracket 12, and the water tank bracket 12 is fixed to the ground in the form of piling. The volume of the water tank should be determined in combination with the borehole diameter and depth. After the borehole volume is calculated, it should be multiplied by the estimation coefficient in combination with the actual situation. The formula is: V=(r 2 ×π)*§; V------total volume of water tank, in m 3 , the volume of a single water tank = V / n (n is the number of water tanks); r------drilling radius, in m; π-----pi, set to 3.14; §------estimation coefficient, determined in combination with experiments, set to 0.3~0.6.

[0037] The filter diameter should be determined according to the particle size of the local drilling mud residue. The filter uses a wire filter. To ensure that the mud density meets the standard requirements, the mud density should be checked during and after each pile foundation construction. If the mud density is less than 1.25, mud should be added to adjust the density. The filter should be checked after each pile foundation construction. If the filter is damaged, it should be replaced in time.

[0038] Valve selection: The whole device is equipped with two types of valves, namely check valve and valve.

[0039] Mud circulation steps:

[0040] The mud is circulating positively, such as Figure 1As shown, in the first step, after the positive circulation drilling rig 11 works to drill out the drill cuttings, the wall protection mud 1 and the drill cuttings are extracted by the vacuum pump 3 and sent to the mud pump 4 for pressurization; in the second step, the mud is sent to the low-level water tank 15 after being pressurized, and the first valve 2 and the third valve 5 are arranged on the transportation pipeline. The valves are used to control the mud transportation and also facilitate the disassembly of the pump unit; in the third step, the drill cuttings can be discharged through the discharge pipe 7 by opening the discharge gate valve 6, and the discharged mud can be contained in a container or directly loaded and transported away; in the fourth step, the drill cuttings pass through the coarse filter 8 and the fine filter in the box. 9 filtration, the mud supernatant is discharged into the high-level water tank 16 through the water pipe 14. The water tank is provided with a discharge pipe 7 and an overflow trumpet 10 to control the mud liquid level and clean the mud drilling slag respectively. The diameters of the overflow trumpet 10 and the discharge pipe 7 should be greater than 300mm; the fifth step, during the construction, sampling is conducted in the water tank to check whether the mud specific gravity meets the standard. If the mud specific gravity does not meet the requirement of 1.25, the prepared mud should be added to the water tank at the highest elevation; the sixth step, the mud supernatant flows from the water tank into the positive circulation drilling rig 11, and the work of step one is repeated.

[0041] Mud reverse circulation, such as Figure 4 As shown, in the first step, after the reverse circulation drilling rig 19 drills out the drill cuttings, the wall protection mud 1 and the drill cuttings pass through the reverse circulation drilling rig 19 and are pumped to the highest filtering water tank (i.e., the high-level water tank 16) by the vacuum pump 3; in the second step, the mud and drill cuttings are filtered by gravity through the coarse filter 8 and the fine filter 9 in the box. It is worth noting that the reverse circulation system should regularly salvage the drill cuttings in the water tank to avoid affecting the filtering effect; in the third step, the drill cuttings are filtered, and the waste mud and part of the drill cuttings can be discharged from the reverse circulation system through the drain pipe 7; in the fourth step, the mud finally flows into the borehole to realize the mud circulation. Since the reverse circulation makes full use of the pressurization of the mud by the reverse circulation drilling rig, the reverse circulation drilling rig can use no mud pump when the drilling rig pressurization meets the conditions.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] The above is a detailed introduction to a high-level mud water tank device and a construction method for a circulating drilling rig provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A high-position mud water tank device for a circulating drilling rig, characterized in that: The invention comprises a wall protection mud (1) and a low-level water tank (15) and a high-level water tank (16) arranged one high and one low. The low-level water tank (15) and the high-level water tank (16) both comprise a box body, a coarse filter (8) and a fine filter (9). The coarse filter (8) and the fine filter (9) are sequentially installed inside the box body from bottom to top. A discharge pipe (7) is arranged at the bottom of the box body. A discharge gate valve (6) is installed on the discharge pipe (7). A conveying pipe (13) is connected to the bottom of the low-level water tank (15). One end of the conveying pipe (13) is inserted into the wall protection mud (1). A first valve (2) is installed on the conveying pipe (13). A water conveying valve (2) is installed between the top of the low-level water tank (15) and the bottom of the high-level water tank (16). A pipeline (14), a second valve (17) is installed on the water delivery pipeline (14), and a connecting pipeline (18) is installed on the top of the high-level water tank (16); it also includes a positive circulation drilling rig (11) or a reverse circulation drilling rig (19), a vacuum pump (3), a mud pump (4) and a third valve (5) are installed in sequence on the delivery pipeline (13) from the first valve (2) to the low-level water tank (15), and the connecting pipeline (18) is connected to the positive circulation drilling rig (11); the connecting pipeline (18) is connected to the reverse circulation drilling rig (19), and a fourth valve (20), a vacuum pump (3) and a fifth valve (21) are installed in sequence on the connecting pipeline (18) from the high-level water tank (16) to the reverse circulation drilling rig (19).

2. The high-position mud water tank device of a circulating drilling rig according to claim 1, characterized in that: The distance between the coarse filter (8) and the fine filter (9) ranges from 80 to 120 mm.

3. The high-position mud water tank device of a circulating drilling rig according to claim 1 is characterized in that: An overflow bell pipe (10) is installed on the top of each box.

4. The high-position mud water tank device of a circulating drilling rig according to claim 1, characterized in that: The diameter of the water delivery pipeline (14) is greater than 300 mm.

5. The high-position mud water tank device of a circulating drilling rig according to claim 1, characterized in that: The box body is made of stainless steel.

6. The high-position mud water tank device of a circulating drilling rig according to claim 1, characterized in that: The bottom of the low-position water tank (15) and the bottom of the high-position water tank (16) are both provided with a water tank bracket (12).

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