An automatic mud weight control system and control method

Abstract

The present application provides a kind of mud specific gravity automatic control system and control method, the control system includes stake machine unit, clean water pool and slurry pool, the stake machine unit is connected with slurry pool by first conveying device for conveying slurry, and the clean water pool is connected with stake machine unit by second conveying device for conveying clean water;The stake machine unit includes stake hole, stake machine is arranged above stake hole, mud specific gravity detection device is arranged in stake hole, the mud specific gravity detection device includes concentration meter, first gear, first sensor and first processor, first sensor is by collecting the angle of rotation of concentration meter drive first gear, and then the mud specific gravity in first processor is collected, and second conveying device is driven to carry out mud specific gravity adjustment.The present application ensures high-precision measurement of mud specific gravity, and further improves work efficiency through automatic control system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of the positive circulation bored pile machine, and particularly relates to a mud specific gravity automatic control system and a control method. BACKGROUND

[0002] The engineering pile machine is a pile working machine that can be used for piling, and is used for the construction of piles that bear stress in buildings and structures. The positive circulation bored pile machine is a kind of pile machine.

[0003] The utility model patent CN206785335U discloses a mud double circulation system of a drilling equipment, which comprises a hollow drill rod and a mud pool. It further comprises a positive circulation pump, a reverse circulation pump, a mud channel, a first mud pipe, a second mud pipe, a third mud pipe and a landun valve. The mud channel is connected with the mud pool and the drill hole. The inlet of the first mud pipe is connected with the mud pool, and the outlet of the first mud pipe is connected with the first valve port of the landun valve. The positive circulation pump is arranged on the first mud pipe. The inlet of the second mud pipe is connected with the second valve port of the landun valve, and the outlet of the second mud pipe is connected with the mud pool. The reverse circulation pump is arranged on the second mud pipe. One end of the third mud pipe is connected with the third valve port of the landun valve, and the other end is connected with the top of the drill rod. Although the system can realize both positive circulation and reverse circulation, in the construction of the bored pile, most of the encountered strata are quaternary strata, which are loose, easy to collapse and have strong water sensitivity. The mud has high specific gravity, which can stabilize the hole wall, but the useless solid content is high, resulting in thick mud skin attached to the hole wall, which will cause the hole to shrink in diameter and cause the hole wall to collapse due to hydration, so that the hole cannot be purified, causing difficulty in hole cleaning. Due to the long interval time of each process, the mud has low specific gravity, and the solid particles in the mud are easy to precipitate. The sediment cannot be cleaned in time, which will affect the strength of the pile body and the pouring of underwater concrete.

[0004] In addition, in the construction process, the measurement of the specific gravity of the mud requires a special instrument, and each measurement only measures the concentration value of the mud at that time. If the mud concentration cannot meet the requirements, the water pump needs to be opened or closed to achieve the designed concentration value through mud internal circulation or external circulation, resulting in the need for repeated measurement of the specific gravity of the mud. Therefore, the patent cannot strictly control the performance of the mud through automation, and the mud is the key technology to ensure the quality of the hole and remove the sediment at the bottom of the hole. In the drilling process, the specific gravity of the mud is maintained at 1.10-1.25 to improve the quality of the wall protection mud and the hole cleaning efficiency. The positive circulation mud wall protection is adopted, and the mud in the mud pool is supplied by a high-pressure mud pump. When the hole is formed, the mud is punched into the hole through the drill rod to protect the wall. The waste mud discharged from the pile hole is pumped to the mud pool through the axial flow pump arranged at the hole opening for recycling. The mud specific gravity automatic detection device, the mud height detection device and the mud pipe are combined into a positive circulation bored pile machine mud specific gravity automatic control system, which can automatically and accurately control the specific gravity of the mud, and is of great significance to mud wall protection and emptying. SUMMARY

[0005] The present application aims to provide a mud specific gravity automatic control system and control method to solve the technical problem of mud specific gravity difficult to control accurately in the construction process.

[0006] To solve the above technical problems, the specific technical solutions of the present application are as follows:

[0007] A mud specific gravity automatic control system, the control system comprises a pile machine unit and a mud pool, the pile machine unit and the mud pool are connected through a first conveying device for conveying mud, and further comprising a clean water pool, the clean water pool and the pile machine unit are connected through a second conveying device for conveying clean water;

[0008] The pile machine unit comprises a pile hole, a pile machine arranged above the pile hole, a drill rod of the pile machine extending into the pile hole, and a mud specific gravity detection device arranged at a position close to the drill rod of the pile hole, the mud specific gravity detection device comprises a first housing, a densimeter arranged in the first housing, and a first gear, one end of the densimeter is a first bar-shaped tooth, the first bar-shaped tooth is engaged with the first gear, the other end of the densimeter is a first buoy, the first bar-shaped tooth drives the first gear to rotate under the cooperation of the first buoy, the mud specific gravity detection device further comprises a first processor and a first sensor for detecting the rotation angle of the first gear, the output end of the first sensor is electrically connected with the receiving end of the first processor, and the output end of the first processor is connected with the input end of the second conveying device;

[0009] The drill rod is connected with a drill rod pipe at an end away from the pile hole, and the drill rod pipe and the mud pool are connected through a third conveying device for conveying mud.

[0010] Therefore, the first buoy at one end of the densimeter can float up and down according to the specific gravity coefficient of the mud, and the first bar-shaped tooth at the other end of the densimeter drives the first gear to rotate, the first sensor transmits the angle data of the rotation of the first gear to the first processor for processing, and the first processor controls the opening or closing of the second conveying device according to the data of the first sensor, thereby realizing the automatic and accurate control of the specific gravity of the mud.

[0011] Further, the first conveying device is a mud pump arranged in the pile hole and a pipeline connected to the mud pool, the second conveying device is a water pump arranged in the clean water pool and a pipeline connected to the pile hole, and the third conveying device is a mud pump arranged in the mud pool and a pipeline connected to the drill rod pipe.

[0012] Further, the mud pool is provided with a mud height detection device, which comprises a second housing, a second buoyancy device arranged in the second housing, a second sensor for acquiring position data of the second buoyancy device, and a second processor, with an output end of the second sensor being electrically connected to an input end of the second processor;

[0013] The drill pipe is further provided with a mud discharge pipe, the drill pipe, the mud discharge pipe and the third conveying device are connected through a tee joint, the mud discharge pipe is provided with a second valve, the second valve comprises a fourth housing, a third gear and a second valve core arranged in the fourth housing, one end of the second valve core is a third bar-shaped tooth, the third bar-shaped tooth is engaged with the third gear, the other end of the second valve core is a second valve head, the second valve head is driven by the second valve core to open or close the second valve, the second valve further comprises a second motor for driving the third gear to rotate, and an output end of the second processor is electrically connected to an input end of the second motor.

[0014] Therefore, the mud height detection device is arranged to avoid mud overflow in the mud pool, the second buoyancy device can float up and down according to the height of the mud in the mud pool, the second sensor sends the position data of the second buoyancy device to the second processor, the second processor controls the second valve of the mud discharge pipe to open or close according to the position data of the second buoyancy device, when the second processor determines that the mud in the mud pool is too high, the second processor sends a control signal to control the second valve to open, at this time, part of the mud conveyed by the third conveying device enters the drill pipe and then enters the drill rod, and the other part of the mud is discharged to the mud transfer pool through the mud discharge pipe.

[0015] Further, the pile hole is provided with a casing, and the casing is located at the periphery of the drill rod, and the mud specific gravity detection device is arranged on the inner wall of the casing.

[0016] In addition, the drill pipe is provided with a first valve, the first valve comprises a third housing, a second gear and a first valve core arranged in the third housing, one end of the first valve core is a second bar-shaped tooth, the second bar-shaped tooth is engaged with the second gear, the other end of the first valve core is a first valve head, the first valve head is driven by the first valve core to open or close the first valve, and the first valve further comprises a first motor for driving the second gear to rotate.

[0017] Based on the same inventive concept, the application further provides a method for automatically controlling the mud specific gravity by using the mud specific gravity automatic control system, which comprises the following steps:

[0018] Step one, the first conveying device and the third conveying device are opened, and the pile machine unit enters the positive circulation drilling mode;

[0019] Step two, the first sensor of the mud specific gravity detection device sends a mud specific gravity too large instruction to the first processor, at this time the first processor sends an opening instruction to the third conveying device, and the clean water in the clean water pool is conveyed to the pile hole of the pile unit through the third conveying device;

[0020] Step three, the first sensor of the mud specific gravity detection device sends a mud specific gravity too small instruction to the first processor, at this time the first processor sends a stop instruction to the second conveying device, and the clean water in the clean water pool is no longer conveyed to the pile hole of the pile unit;

[0021] Step four, repeat steps two and three until the punching and hole cleaning work is completed.

[0022] The mud specific gravity automatic control system and control method have the following advantages:

[0023] The mud specific gravity automatic control system can automatically detect the mud concentration at the drill rod, and can complete the re-distribution of the mud concentration through the control of the second conveying device. Compared with the manual measurement and manual distribution of the mud concentration in the prior art, the present application can ensure high precision while further improving the work efficiency through automatic control. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the mud specific gravity automatic control system of the present application;

[0025] Figure 2 It is a structural schematic diagram of the pile casing of the present application;

[0026] Figure 3 It is a structural schematic diagram of the mud specific gravity detection device of the present application;

[0027] Figure 4 It is an exploded view of the mud specific gravity detection device of the present application;

[0028] Figure 5 It is a use state diagram of the mud specific gravity detection device of the present application, wherein a) is the first state and b) is the second state;

[0029] Figure 6 It is an exploded view of the mud height detection device of the present application;

[0030] Figure 7 It is a use state diagram of the mud height detection device of the present application, wherein a) is the first state and b) is the second state;

[0031] Figure 8 It is a structural schematic diagram of the valve head of the present application;

[0032] Figure 9This is an exploded view of the valve head of the present invention;

[0033] Figure 10 This is a diagram showing the usage state of the valve head of the present invention, where a) is the first state and b) is the second state.

[0034] Explanation of markings in the diagram: 1. Pile driver unit; 2. Mud pit; 3. Clear water tank; 4. T-junction; 5. Mud specific gravity testing device; 6. Mud height testing device; 7. First valve; 8. Second valve; 9. Casing; 11. Pile hole; 12. Pile driver; 121. Drill rod; 122. Drill rod pipe; 123. Slurry discharge pipe; 13. First movable channel; 14. Second movable channel; 15. Installation area; 21. Third conveying device; 41. First conveying device; 42. Second conveying device; 51. First housing; 52. Concentration meter; 52 1. First strip tooth; 522. First buoyancy device; 53. First gear; 54. First processor; 55. First sensor; 61. Second housing; 62. Second buoyancy device; 63. Second sensor; 64. Second processor; 71. Third housing; 72. Second gear; 73. First valve core; 731. Second strip tooth; 732. First valve head; 74. First motor; 81. Fourth housing; 82. Third gear; 83. Second valve core; 831. Third strip tooth; 832. Second valve head; 84. Second motor. Detailed Implementation

[0035] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, an automatic mud gravity control system according to this embodiment includes a pile driver unit 1, a mud tank 2, and a clear water tank 3. The pile position hole 11 of the pile driver unit 1 is connected to the mud tank 2 via a first conveying device 41 for conveying mud, and the clear water tank 3 is connected to the pile driver unit 1 via a second conveying device 42 for conveying clear water. Preferably, the first conveying device 41 is a mud pump installed in the pile position hole 11 and a pipe connected to the mud tank 2, and the second conveying device 42 is a water pump installed in the clear water tank 3 and a pipe connected to the pile position hole 11.

[0037] like Figure 1 and Figure 2 As shown, the pile driver unit 1 includes a pile position hole 11 and a pile driver 12 disposed above the pile position hole 11. A protective casing 9 is provided inside the pile position hole 11. The drill rod 121 of the pile driver 12 passes through the protective casing 9 and extends into the pile position hole 11. The protective casing 9 is located outside the drill rod 121. A mud specific gravity detection device 5 is installed on the inner wall of the protective casing 9.

[0038] likeFigures 3 to 5 As shown in the figure, the mud specific gravity detection device 5 comprises a first housing 51, a concentration meter 52 and a first gear 53 arranged in the first housing 51, one end of the concentration meter 52 is a first rack 521, the first rack 521 is engaged with the first gear 53, the other end of the concentration meter 52 is a first buoy 522, the first buoy 522 floats up and down under the action of mud or gravity, at the same time, the first rack 521 drives the first gear 53 to rotate under the cooperation of the first buoy 522, the mud specific gravity detection device 5 further comprises a first processor 54 and a first sensor 55 for detecting the rotation angle of the first gear 53, the output end of the first sensor 55 is electrically connected with the receiving end of the first processor 54, and the output end of the first processor 54 is electrically connected with the input end of the second conveying device 42. Specifically, as shown in the figure, Figure 4 The first processor 54 is electrically connected with the water pump in the clean water tank 3, thereby driving the water pump to open or close. The mud specific gravity detection device body 1 is provided with a first movable channel 13 corresponding to the first rack 521, and is further provided with a second movable channel 14 corresponding to the first buoy 522, and the first movable channel 13 and the second movable channel 14 are communicated. One side of the first movable channel 13 is further provided with a mounting area 15 of the first gear 53, and the first movable channel 13 is communicated with the mounting area 15.

[0039] Preferably, as shown in the figure, Figure 5 The position where the bottom of the concentration meter 52 is flush with the bottom of the mud specific gravity detection device 5 body is set as the initial scale of the mud specific gravity meter, and the corresponding concentration scales are recorded by putting the concentration meter 52 into the mud tank with different concentrations which have been measured. For example, the concentration meter 52 is put into the mud with a specific gravity of 1.5, and the concentration meter 52 sinks under the action of gravity, and the position which contacts the mud surface at this time is recorded as 1.5. The concentration meter 52 is put into the mud with a specific gravity of 1.1, and the concentration meter 52 sinks under the action of gravity, and the position which contacts the mud surface at this time is recorded as 1.1, and other scales are recorded in the same way. The distance of the sinking of the concentration meter 52 corresponds to the rotation angle of the first gear 53, and the distance of the sinking of the concentration meter 52 can be known by detecting the rotation angle of the first gear 53, that is, the concentration of the mud at this time.

[0040] As shown in the figure, Figure 1 , Figure 6 and Figure 7As shown in the figure, the mud pool 2 is provided with a mud height detection device 6, which comprises a second housing 61, a second buoyancy device 62, a second sensor 63 and a second processor 64 arranged in the second housing 61, the second buoyancy device 62 floats up and down under the action of mud or gravity, the second sensor 63 is used to obtain the position data of the second buoyancy device 62, and the output end of the second sensor 63 is electrically connected with the input end of the second processor 64.

[0041] As shown in the figure, Figure 1 The drill pipe 121 is connected with a drill pipe pipe 122 at one end away from the pile hole 11, and the drill pipe pipe 122 is connected with the mud pool 2 through a third conveying device 21 for conveying mud. Preferably, the third conveying device 21 is a mud pump arranged in the mud pool 2 and a pipeline connected to the drill pipe pipe 122. A mud discharge pipe 123 is also arranged on the drill pipe pipe 122, and the drill pipe pipe 122, the mud discharge pipe 123 and the third conveying device 21 are connected through a tee joint 4. A first valve 7 is arranged on the drill pipe pipe 122, and a second valve 8 is arranged on the mud discharge pipe 123.

[0042] As shown in the figure, Figures 8 to 10 The first valve 7 comprises a third housing 71, a second gear 72 and a first valve core 73 arranged in the third housing 71. One end of the first valve core 73 is a second bar-shaped tooth 731, which is engaged with the second gear 72. The other end of the first valve core 73 is a first valve head 732, which is driven by the first valve core 73 to open or close the first valve 7. The first valve 7 further comprises a first motor 74 for driving the second gear 72 to rotate. The second valve 8 comprises a fourth housing 81, a third gear 82 and a second valve core 83 arranged in the fourth housing 81. One end of the second valve core 83 is a third bar-shaped tooth 831, which is engaged with the third gear 82. The other end of the second valve core 83 is a second valve head 832, which is driven by the second valve core 83 to open or close the second valve 8. The second valve 8 further comprises a second motor 84 for driving the third gear 82 to rotate. As shown in the figure, Figure 6 and Figure 9 The output end of the second processor 64 is electrically connected with the input end of the second motor 84.

[0043] The mud specific gravity automatic control method of the embodiment comprises the following steps:

[0044] Step one, open the first conveying device 41 and the third conveying device 21, and the pile machine unit 1 enters the positive circulation drilling mode.

[0045] Step two, the first sensor 55 of the mud specific gravity detection device 5 sends a mud specific gravity too large instruction to the first processor 54, at this time the first processor 54 sends an opening instruction to the third conveying device 21, and the clean water in the clean water pool 3 is conveyed to the pile hole 11 of the pile unit 1 through the third conveying device 21.

[0046] Step three, the first sensor 55 of the mud specific gravity detection device 5 sends a mud specific gravity too small instruction to the first processor 54, at this time the first processor 54 sends a stop instruction to the second conveying device 42, and the clean water in the clean water pool 3 is no longer conveyed to the pile hole 11 of the pile unit 1.

[0047] Step four, steps two and three are repeated until the punching and hole cleaning work is completed.

[0048] However, in step two, when the clean water in the clean water pool 3 is conveyed to the pile hole 11 of the pile unit 1 through the third conveying device 21, the mud in the mud pool 2 may be excessive, therefore, in order to prevent the mud in the mud pool 2 from overflowing, the embodiment provides a mud height automatic control method, comprising the following steps:

[0049] Step one, the first valve 7 is in an opening state, and the second valve 8 is in a closing state, at this time, the mud in the mud pool 2 is conveyed to the drill pipe 122 under the cooperation of the third conveying device 21.

[0050] Step two, when the mud in the mud pool 2 increases, the second buoyancy device 62 of the mud height detection device 6 floats up under the action of the mud, the second sensor 63 sends the position data of the second buoyancy device 62 to the second processor 64, when the second processor 64 determines that the mud is excessive, the second processor 64 sends a driving signal to the second motor 84 of the second valve 8, at this time the second motor 84 drives the third gear 82 to rotate, the third gear 82 drives the third bar tooth 831 to move, until the second valve head 832 opens the second valve 8, at this time part of the mud is discharged into the mud transfer pool through the mud discharge pipe 123.

[0051] Step three, when the mud in the mud pool 2 decreases, the second buoyancy device 62 of the mud height detection device 6 sinks under the action of gravity, the second sensor 63 sends the position data of the second buoyancy device 62 to the second processor 64, when the second processor 64 determines that the mud is insufficient, the second processor 64 sends a driving signal to the second motor 84 of the second valve 8, at this time the second motor 84 drives the third gear 82 to rotate, the third gear 82 drives the third bar tooth 831 to move, until the second valve head 832 closes the second valve 8, at this time the mud in the mud pool 2 is all conveyed to the drill pipe 122 under the cooperation of the third conveying device 21.

[0052] It is to be understood that the present application is described by way of example only, and that modifications or alterations can be made to the features and embodiments described without departing from the spirit and scope of the application. In addition, modifications can be made to the features and embodiments described to accommodate specific situations and materials without departing from the spirit and scope of the application. Accordingly, the application is not limited to the specific embodiments disclosed herein, but rather, the scope of the application includes all embodiments falling within the scope of the claims.

Claims

1. An automatic control system for mud specific gravity, comprising a pile driver unit (1) and a mud tank (2), wherein the pile driver unit (1) and the mud tank (2) are connected by a first conveying device (41) for conveying mud, characterized in that, It also includes a clear water tank (3), which is connected to the pile driver unit (1) via a second conveying device (42) for conveying clear water; The pile driver unit (1) includes a pile hole (11) and a pile driver (12) positioned above the pile hole (11). The drill rod (121) of the pile driver (12) extends into the pile hole (11), and a mud density detection device (5) is provided in the pile hole (11) near the drill rod (121). The mud density detection device (5) includes a first housing (51), a concentration meter (52) and a first gear (53) disposed in the first housing (51). One end of the concentration meter (52) is a first strip tooth (521), and the first strip tooth (521) is connected to the first gear. The first gear (53) meshes with the first gear (53), and the other end of the concentration meter (52) is a first buoyancy device (522). The first strip tooth (521) drives the first gear (53) to rotate under the cooperation of the first buoyancy device (522). The mud specific gravity detection device (5) also includes a first processor (54) and a first sensor (55) for detecting the rotation angle of the first gear (53). The output end of the first sensor (55) is electrically connected to the receiving end of the first processor (54), and the output end of the first processor (54) is electrically connected to the input end of the second conveying device (42). The drill rod (121) is connected to a drill pipe (122) at one end away from the pile hole (11), and the drill pipe (122) is connected to the mud pit (2) by a third conveying device (21) for conveying mud.

2. The automatic mud specific gravity control system according to claim 1, characterized in that, The first conveying device (41) is a mud pump installed in the pile hole (11) and a pipe connected to the mud pool (2). The second conveying device (42) is a water pump installed in the clear water pool (3) and a pipe connected to the pile hole (11). The third conveying device (21) is a mud pump installed in the mud pool (2) and a pipe connected to the drill pipe (122).

3. The automatic mud specific gravity control system according to claim 1, characterized in that, The mud tank (2) is equipped with a mud height detection device (6). The mud height detection device (6) includes a second housing (61), a second buoyancy device (62), a second sensor (63), and a second processor (64) disposed in the second housing (61). The second sensor (63) is used to acquire the position data of the second buoyancy device (62). The output end of the second sensor (63) is electrically connected to the input end of the second processor (64). The drill pipe (122) is also provided with a slurry discharge pipe (123). The drill pipe (122), the slurry discharge pipe (123) and the third conveying device (21) are connected by a tee (4). The slurry discharge pipe (123) is equipped with a second valve (8). The second valve (8) includes a fourth housing (81), a third gear (82) and a second valve core (83) disposed in the fourth housing (81). One end of the second valve core (83) is a third strip tooth (831), which meshes with the third gear (82). The other end of the second valve core (83) is a second valve head (832). The second valve head (832) opens or closes the second valve (8) under the drive of the second valve core (83). The second valve (8) also includes a second motor (84) for driving the third gear (82) to rotate. The output end of the second processor (64) is electrically connected to the input end of the second motor (84).

4. The automatic mud specific gravity control system according to claim 1, characterized in that, A casing (9) is provided inside the pile hole (11), and the casing (9) is located on the periphery of the drill rod (121). The mud specific gravity detection device (5) is installed on the inner wall of the casing (9).

5. The automatic mud specific gravity control system according to any one of claims 1 to 4, characterized in that, The drill pipe (122) is provided with a first valve (7). The first valve (7) includes a third housing (71), a second gear (72) and a first valve core (73) disposed in the third housing (71). One end of the first valve core (73) is a second tooth (731) that meshes with the second gear (72). The other end of the first valve core (73) is a first valve head (732). The first valve head (732) opens or closes the first valve (7) under the drive of the first valve core (73). The first valve (7) also includes a first motor (74) for driving the second gear (72) to rotate.

6. A method for automatically controlling the specific gravity of mud using the automatic mud specific gravity control system as described in any one of claims 1 to 5, comprising the following steps: Step 1: Turn on the first conveying device (41) and the third conveying device (21), and the pile driver unit (1) enters the positive circulation drilling mode; Step 2: The first sensor (55) of the mud specific gravity detection device (5) sends a mud specific gravity too high command to the first processor (54). At this time, the first processor (54) sends an opening command to the third conveying device (21). The clear water in the clear water pool (3) is transported to the pile position hole (11) of the pile driver unit (1) through the third conveying device (21). Step 3: The first sensor (55) of the mud specific gravity detection device (5) sends a mud specific gravity too low command to the first processor (54). At this time, the first processor (54) sends a stop command to the second conveying device (42), and the clear water in the clear water pool (3) is no longer transported to the pile position hole (11) of the pile driver unit (1). Step 4: Repeat steps 2 and 3 until the drilling and cleaning work is completed.

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