Device and method for adjusting effect of slurry wall protection of bored cast-in-place pile

Abstract

The present invention discloses a device and method for adjusting the mud wall protection effect of bored piles, which is used for pile foundation drilling, and includes a slurry making system, wherein the slurry making system includes a slurry preparation device, a filling machine and a water storage system connected to the slurry preparation device; the capacity limiting system includes a hammer arranged at the top of the pile hole and a punching machine connected to the hammer through a steel cable; the monitoring system includes a gravity sensor, a length measuring device and a displacement sensor. The present invention can realize the rapid preparation of high-quality mud, and can also monitor the specific gravity of the mud in real time, and automatically adjust the specific gravity of the mud in the pile hole according to the monitoring result. Under the premise of ensuring the mud wall protection effect, the material for preparing the mud can be effectively saved, and the mud preparation system adopts a method of pre-preparing high-concentration mud and then diluting it when using it, and the process is automatically controlled, which improves the slurry making efficiency and saves floor space.

Description

Technical Field

[0001] The invention belongs to the technical field of bored cast-in-place piles for bridge engineering, and in particular relates to a method for adjusting the mud wall protection effect of bored cast-in-place piles. Background Art

[0002] Mud wall protection is very important in bored pile construction, and the properties and indicators of mud determine the effect of wall protection. When encountering poor geology, the wall protection effect of mud is particularly important. If the properties of the mud are poor, it may cause problems such as low sand carrying capacity or inability to form mud skin to effectively protect the wall. For mud indicators, the current on-site construction mainly relies on the mud three-piece set to measure, including mud specific gravity, viscosity, sand rate, etc., but the mud three-piece set is cumbersome to use, and it is difficult to achieve real-time monitoring of mud indicators throughout the construction process. The site mostly relies on the workers' experience to judge the mud consistency, which will not only make it difficult to ensure the mud wall protection effect, but also may cause material waste. If the mud concentration is too high, the mud has a large specific gravity, which will cause the mud skin to be too thick, the pile quality is poor, and it is difficult to pour concrete; if the mud concentration is too low, the mud has a small specific gravity and a small mud viscosity, which will cause poor wall protection effect and poor sand carrying capacity. In addition, during the construction of bored cast-in-place piles, when encountering unfavorable geological conditions such as caves and fissures and slurry leakage occurs, the problem of mud collapse often occurs due to untimely mud replenishment.

[0003] In view of the above problems, the present invention proposes a device and method for adjusting the mud wall protection effect of bored cast-in-place piles, which can realize the rapid preparation of high-quality mud, and can also monitor the mud density in real time, and automatically adjust the density of the mud in the pile hole according to the monitoring results. Under the premise of ensuring the mud wall protection effect, it can effectively save materials for preparing the mud. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for adjusting the mud wall protection effect of bored piles to solve the above problems.

[0005] To achieve the above object, the present invention provides the following scheme: a device for adjusting the mud wall protection effect of bored piles, used for pile foundation hole forming, comprising a slurry making system, the slurry making system comprising a slurry preparation device, a filling machine connected to the slurry preparation device, and a water storage system;

[0006] A capacity limiting system, the capacity limiting system comprising a hammer arranged at the top of the pile hole and a punching machine connected to the hammer through a steel cable;

[0007] A monitoring system, the monitoring system comprising a gravity sensor, a length measuring device and a displacement detector; the gravity sensor is connected to the sedimentation tank and is used to measure the specific gravity of the mud transported from the pile hole to the sedimentation tank;

[0008] The length measuring device is used to measure the length of the impact hammer extending into the pile hole;

[0009] The displacement detector is used to measure the amount of mud transported by the mud preparation device.

[0010] Furthermore, both ends of the gravity sensor are respectively connected to the first mud pipeline and the second mud pipeline; one end of the first mud pipeline extends into the pile hole, and one end of the second mud pipeline extends into the sedimentation tank;

[0011] The sedimentation tank is also communicated with the inner cavity of the pile hole through a third mud pipeline;

[0012] The displacement detector is installed at the slurry discharge port of the mud preparation device; the displacement detector is installed on the fourth mud pipeline, and the fourth mud pipeline extends into the pile hole; one end of a fifth mud pipeline is installed on the water storage system, and the other end of the fifth mud pipeline extends into the pile hole; the mud preparation device is communicated with the water storage system through a sixth mud pipeline.

[0013] Furthermore, it also includes a first control system and a second control system; the first control system is used to receive the data of the gravity sensor, length measuring device, and displacement detector, and control the mud preparation device and the filler; the second control system is used to receive the data of the gravity sensor, length measuring device, and displacement detector, and control the water storage system.

[0014] Furthermore, the mud specific gravity γ2 passing through the gravity sensor is:

[0015] wherein, g is the gravity coefficient, ρ s is the known density of water, V c is the fixed value of the mud volume passing through the gravity sensor, and G is the gravity value.

[0016] Furthermore, the volume V of the mud input by the mud preparation device is: V = v·S·t;

[0017] wherein, v is the fixed flow velocity, S is the cross-sectional area, and t is the discharge time.

[0018] Furthermore, the equipment volume of the mud preparation device is V0; the target mud specific gravity in the pile hole is γ1, the maximum vertical suspension length of the steel cable of the punching machine measured by the length measuring device is L, the height of the impact hammer is H2, the height of the punching machine is H3, and the depth of the pile hole is H1; the required mud volume V1 in the pile hole and the unit weight γ0 of the mud in the mud preparation device are obtained as:

[0019]

[0020] H1 = L + H2 - H3;

[0021] V1·γ1=V0·γ0;

[0022]

[0023] The density of water is known to be ρ s , then the weight m0 of the mud in the mud preparation device is:

[0024] m0=γ0·ρ s V0;

[0025] The density of the soil used to prepare the mud is ρ t , then the weight of soil and water required to prepare the mud of m0 weight in the mud preparation device is m t and m s , and their corresponding volumes are V t and V s ;

[0026]

[0027]

[0028] A method for adjusting the mud wall protection effect of bored piles comprises the following steps:

[0029] Step 1: The bored pile construction begins. The length measuring device sends the measurement data to the first control system, calculates the required mud volume V1 in the pile hole, and then calculates and controls the filling machine to add m to the mud preparation device. t Weight soil, calculate and control the water storage system to add V to the mud preparation device s volumetric water;

[0030] Step 2: The first control system controls the mud preparation device to inject the first V0 volume of mud into the pile hole, and the second control system controls the water storage system to inject (V1-V0) volume of water into the pile hole;

[0031] Step 3: After the first V0 volume of mud is injected into the pile hole, the mud preparation device continues to prepare and fill the pile hole with mud of the same specific gravity for rapid grouting in case of leakage;

[0032] Step 4: Start the punching machine. When the hole depth increases, the length measuring device measures the new L value and sends the signal to the first control system. The first control system calculates the new mud density γ′0 in the mud preparation device and calculates the new mud weight m′0. Then the first control system controls the filling machine to add m′ to the mud preparation device. t Weight of soil:

[0033] m′ t =m′0-m s -m t ;

[0034] m′0 = γ′0·ρ s ·V0;

[0035] Step 5: The gravity sensor sends the γ2 value to the first control system and the second control system;

[0036] Step 6: When a certain volume of mud is used up in the mud preparation device, the first control system controls the slurry making system to reconfigure the corresponding volume of mud according to the displacement data of the fourth mud pipe measured by the displacement detector;

[0037] Step 7: When there is footage in the depth of the pile hole, the length measuring device sends the latest maximum hanging length L of the steel cable to the second control system. The second control system calculates the difference between the new and old maximum hanging lengths as ΔL, calculates the amount of mud to be supplemented into the pile hole as V4, and the first control system controls the mud preparation device to inject V′4 volume of mud into the hole, then:

[0038]

[0039] Repeat Step 6 to replenish the mud preparation device.

[0040] Furthermore, in Step 5, when the γ2 value is too small and does not meet the mud index requirements, the first control system controls the mud preparation device to inject mud into the pile hole until the gravity sensor shows that the γ2 value is satisfied and then stops. The maximum high-concentration mud injection volume is controlled to be

[0041]

[0042] When the γ2 value is too large and does not meet the mud index requirements, the second control system controls the water storage system to supply water into the pile hole until the gravity sensor shows that the γ2 value is satisfied and then stops. The maximum water injection volume is controlled to be

[0043]

[0044] Furthermore, Step 6 is specifically as follows. When the first control system receives that the displacement detector measures that the mud preparation device has input V3 volume of high-concentration mud into the pile hole, the first control system controls the filler to supplement m tb weight of soil into the mud preparation device, and controls the water storage system to supplement V sb volume of water into the mud preparation device:

[0045]

[0046] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention can achieve rapid preparation of high-quality mud, can also monitor the mud specific gravity in real time, and automatically adjust the specific gravity of the mud in the pile hole according to the monitoring results. On the premise of ensuring the mud retaining effect, it can effectively save the materials for preparing mud. And the mud preparation system adopts the method of pre-preparing high-concentration mud and diluting it when in use, with automatic control of the process, improving the pulp-making efficiency and saving the floor area. When leakage of mud occurs due to bad geology, it can also quickly replenish the mud, thus avoiding the occurrence of hole collapse. The mud retaining effect in the whole process of bored pile construction is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0048] Figure 1 It is a schematic structural diagram of a pulp-making system;

[0049] Figure 2 It is a schematic structural diagram of a volume-limiting system;

[0050] Wherein, 1, pile hole; 2, gravity sensor; 3, sedimentation tank; 4, mud preparator; 5, first control system; 6, filler; 7, water storage system; 8, second control system; 9, first mud pipeline; 10, second mud pipeline; 11, third mud pipeline; 12, fourth mud pipeline; 13, fifth mud pipeline; 14, sixth mud pipeline; 15, punching machine; 16, length measurer; 17, steel cable; 18, impact hammer; 19, displacement detector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

[0052] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0053] A device for adjusting the mud retaining effect of a bored pile, as shown in Figure 1 and Figure 2As shown in the figure, it is used for the pile hole 1 and includes a slurry making system. The slurry making system includes a slurry preparator 4, a filler 6 communicated with the slurry preparator 4, and a water storage system 7;

[0054] A volume limiting system, which includes a punching hammer 18 arranged at the top of the pile hole 1 and a punching machine 15 transmission-connected with the punching hammer 18 through a steel cable 17;

[0055] A monitoring system, which includes a gravity sensor 2, a length measurer 16 and a displacement detector 19; The gravity sensor 2 is communicated with the sedimentation tank 3 and is used for measuring the specific gravity of the slurry transported from the pile hole 1 to the sedimentation tank 3;

[0056] The length measurer 16 is used for measuring the length of the punching hammer 18 extending into the pile hole 1;

[0057] The displacement detector 19 is used for measuring the amount of slurry transported by the slurry preparator 4.

[0058] Furthermore, both ends of the gravity sensor 2 are respectively connected to a first slurry pipeline 9 and a second slurry pipeline 10; One end of the first slurry pipeline 9 extends into the pile hole 1, and one end of the second slurry pipeline 10 extends into the sedimentation tank 3;

[0059] The sedimentation tank 3 is also communicated with the inner cavity of the pile hole 1 through a third slurry pipeline 11;

[0060] A displacement detector 19 is installed at the slurry discharge port of the slurry preparator 4; The displacement detector 19 is installed on the fourth slurry pipeline 12 and extends into the pile hole 1 in the fourth slurry pipeline 12; One end of a fifth slurry pipeline 13 is installed on the water storage system 7, and the other end of the fifth slurry pipeline 13 extends into the pile hole 1; The slurry preparator 4 is communicated with the water storage system 7 through a sixth slurry pipeline 14.

[0061] Furthermore, it also includes a first control system 5 and a second control system 8; The first control system 5 is used for receiving the data of the gravity sensor 2, the length measurer 16, and the displacement detector 19, and controlling the slurry preparator 4 and the filler 6; The second control system 8 is used for receiving the data of the gravity sensor 2, the length measurer 16, and the displacement detector 19, and controlling the water storage system 7.

[0062] Furthermore, the specific gravity γ2 of the slurry passing through the gravity sensor 2 is:

[0063] Among them, g is the gravity coefficient, ρ s is the known density of water, V c is the fixed value of the volume of the slurry passing through the gravity sensor, and G is the gravity value.

[0064] Furthermore, the volume V of the slurry input by the slurry preparator 4 is: V = v·S·t;

[0065] Among them, v is a fixed flow velocity, S is the cross-sectional area, and t is the discharge time.

[0066] Furthermore, the equipment volume of the mud preparation device 4 is V0; the target mud specific gravity in the pile hole 1 is γ1, the maximum vertical hanging length of the steel cable 17 of the punching machine 15 measured by the length measuring device 16 is L, the height of the punching hammer 18 is H2, the height of the punching machine 15 is H3, and the depth of the pile hole 1 is H1; the mud demand V1 in the pile hole 1 and the specific weight γ0 of the mud in the mud preparation device 4 are as follows:

[0067]

[0068] H1 = L + H2 - H3;

[0069] V1·γ1 = V0·γ0;

[0070]

[0071] The density of water is known to be ρ s , then the weight m0 of the mud in the mud preparation device 4 is:

[0072] m0 = γ0·ρ s ·V0;

[0073] The density of the soil for preparing the mud is ρ t , then the weights of the soil and water required to prepare the mud with a weight of m0 in the mud preparation device 4 are m t and m s , and their corresponding volumes are V t and V s ;

[0074]

[0075] In an embodiment of the present invention, for the mud with a demand volume of V1 in the pile hole 1, the filling machine 6 needs to add m t weight of soil to the mud preparation device 4, and the water storage tank 7 needs to add V s volume of water to the mud preparation device 4;

[0076] When the mud is injected into the pile hole 1 from the mud preparation device 4 through the fourth mud pipe 12, the second control system 8 controls the water storage system 7 to simultaneously input (V1 - V0) volume of water into the pile hole 1, and mud with a volume of V1 and a specific gravity of γ1 can be obtained.

[0077] When the first batch of prepared mud is poured, the mud preparation device 4 still needs to be in a state of being filled with mud to meet the requirement of timely mud replenishment in case of mud leakage, and the concentration of the mud continuously increases as the pile hole 1 deepens and the value measured by the length measuring device 16 increases.

[0078] The mud preparation device 4 can adjust the concentration of the prepared mud. Therefore, a relatively small volume can meet the mud preparation requirement. Due to the small volume, the mud stirring inside the device is more sufficient, and the slurry preparation efficiency is higher.

[0079] A method for adjusting the mud retaining effect of bored cast-in-place piles includes the following steps:

[0080] First step: When the construction of the bored cast-in-place pile starts, the length measuring device 16 sends the measurement data to the first control system 5, calculates the required volume V1 of the mud in the pile hole 1, and then calculates and controls the filler machine 6 to add m t weight of soil to the mud preparation device 4, and calculates and controls the water storage system 7 to add V s volume of water to the mud preparation device 4;

[0081] Second step: The first control system 5 controls the mud preparation device 4 to inject the first batch of mud with a volume of V0 into the pile hole 1, and the second control system 8 controls the water storage system 7 to inject (V1 - V0) volume of water into the pile hole 1;

[0082] Third step: After the first batch of mud with a volume of V0 is injected into the pile hole 1, the mud preparation device 4 continues to prepare and fill the mud with the same specific gravity for rapid mud replenishment in case of mud leakage;

[0083] Fourth step: Start the punching machine 15. When the hole depth increases, the length measuring device 16 measures a new L value and sends the signal to the first control system 5. After that, the first control system 5 calculates the new specific gravity γ′0 of the mud in the mud preparation device 4 and calculates the new mud weight m′0. Then the first control system 5 controls the filler machine 6 to add m′ t weight of soil to the mud preparation device 4:

[0084] m′ t = m′0 - m s - m t ;

[0085] m′0 = γ′0 · ρ s · V0;

[0086] Fifth step: The gravity sensor 2 sends the γ2 value to the first control system 5 and the second control system 8;

[0087] Sixth step: When a certain volume of mud is used up in the mud preparation device 4, the first control system 5 controls the slurry preparation system to reconfigure the corresponding volume of mud according to the displacement data of the fourth mud pipe 12 measured by the displacement detector 19;

[0088] Step 7: When there is an advance in the depth of the pile hole 1, the length measuring device 16 sends the latest maximum suspended length L of the steel cable to the second control system 8. The second control system 8 calculates the difference ΔL between the new and old maximum suspended lengths, and calculates the amount of mud V4 that needs to be supplemented into the pile hole 1. The first control system 5 controls the mud preparation device 4 to inject mud with a volume of V′4 into the hole 1, which is:

[0089]

[0090]

[0091] Repeat step 6 to replenish the mud preparation device 4 with mud.

[0092] Furthermore, in step 5, when the value of γ2 is too small and does not meet the mud index requirements, the first control system 5 controls the mud preparation device 4 to inject mud into the pile hole 1 until the gravity sensor 2 shows that the value of γ2 is satisfied and then stops. The maximum high-concentration mud injection volume is controlled to be

[0093] In an embodiment of the present invention, controlling the maximum high-concentration mud injection volume is to prevent the sensor readings from being delayed and causing mud waste.

[0094] When the value of γ2 is too large and does not meet the mud index requirements, the second control system 8 controls the water storage system 7 to supply water into the pile hole 1 until the gravity sensor 2 shows that the value of γ2 is satisfied and then stops. The maximum water injection volume is controlled to be

[0095]

[0096] In an embodiment of the present invention, controlling the maximum water injection volume is to prevent the sensor readings from being delayed and causing the mud in the pile hole 1 to be overly diluted.

[0097] Furthermore, step 6 is specifically as follows: when the first control system 5 receives that the displacement detector 19 measures that the mud preparation device 4 has input V3 volume of high-concentration mud into the pile hole 1, the first control system 5 controls the 6 filler to supplement m tb weight of soil into the mud preparation device 4, and controls the water storage system 7 to supplement V sb volume of water into the mud preparation device 4:

[0098]

[0099] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0100] The embodiments described above are only for describing the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for adjusting the effect of slurry wall protection of bored cast-in-place piles, which is used for pile foundation hole forming, and is characterized in that, include: A slurry making system, the slurry making system comprising a slurry preparation device (4), a filler (6) connected to the slurry preparation device (4) and a water storage system (7); A capacity limiting system, the capacity limiting system comprising a hammer (18) arranged at the top of the pile hole (1) and a punching machine (15) connected to the hammer (18) by a steel cable (17); A monitoring system, the monitoring system comprising a gravity sensor (2), a length measuring device (16) and a displacement detector (19); the gravity sensor (2) is connected to a sedimentation tank (3) and is used to measure the specific gravity of the mud transported from the pile hole (1) to the sedimentation tank (3); The length measuring device (16) is used to measure the length of the hammer (18) extending into the pile hole (1); The displacement detector (19) is used to measure the amount of mud delivered by the mud preparation device (4); The two ends of the gravity sensor (2) are respectively connected to a first mud pipe (9) and a second mud pipe (10); one end of the first mud pipe (9) extends into the pile hole (1), and one end of the second mud pipe (10) extends into the sedimentation tank (3); The sedimentation tank (3) is also connected to the inner cavity of the pile hole (1) through a third mud pipeline (11); The discharge port of the mud preparation device (4) is equipped with the displacement detector (19); the displacement detector (19) is installed on the fourth mud pipe (12), and the fourth mud pipe (12) extends into the pile hole (1); one end of the fifth mud pipe (13) is installed on the water storage system (7), and the other end of the fifth mud pipe (13) extends into the pile hole (1); the mud preparation device (4) is connected to the water storage system (7) through the sixth mud pipe (14); It also includes a first control system (5) and a second control system (8); the first control system (5) is used to receive data from the gravity sensor (2), the length measuring device (16), and the displacement detector (19), and control the mud preparation device (4) and the filling machine (6); the second control system (8) is used to receive data from the gravity sensor (2), the length measuring device (16), and the displacement detector (19), and control the water storage system (7).

2. The regulating device for the mud protection effect of bored cast-in-place piles according to claim 1, wherein: The mud specific gravity γ2 through the gravity sensor (2) is as follows: where g is the gravitational coefficient, ρ s is the known density of water, V c is the fixed value of the mud volume passing through the gravity sensor, and G is the gravity value.

3. The device for adjusting the mud retaining effect of bored cast-in-place piles according to claim 1, wherein: The volume V of the mud input into the mud preparation device (4) is: V=v·S·t; Among them, v is the constant flow velocity, S is the cross-sectional area, and t is the discharge time.

4. An adjusting device for the mud retaining effect of a bored cast-in-place pile according to claim 1, characterized in that: The equipment volume of the mud preparation device (4) is V0; the target mud specific gravity in the pile hole (1) is γ1, the maximum hanging length of the steel cable (17) of the punching machine (15) measured by the length measuring device (16) is L, the height of the hammer (18) is H2, the height of the punching machine (15) is H3, and the depth of the pile hole (1) is H1; the required mud volume V1 in the pile hole (1) and the bulk density γ0 of the mud in the mud preparation device (4) are obtained as follows: H1=L+H2-H3; V1·γ1=V0·γ0; The known density of water is ρ s , then the weight m0 of the mud in the mud preparation device (4) is: m0 = γ0·ρ s ·V0; The density of the soil for preparing the slurry is ρ t , then the weights of the soil and water required for preparing m0 weight of slurry in the slurry preparation device (4) are m t and m s , and their corresponding volumes are V t and V s ; 5. A method for adjusting the effect of slurry wall protection of bored cast-in-place piles, including the device for adjusting the effect of slurry wall protection of bored cast-in-place piles described in any one of claims 1-4, characterized in that, The following steps are involved: Step 1: The bored cast-in-place pile starts to be constructed. The length measuring device (16) sends the measurement data to the first control system (5), calculates the required amount of mud V1 in the pile hole (1), and then calculates and controls the filler machine (6) to add m t weight of soil, calculates and controls the water storage system (7) to add V s volume of water; Step 2: The first control system (5) controls the mud preparation device (4) to inject the first batch of mud with a volume of V0 into the pile hole (1), and the second control system (8) controls the water storage system (7) to inject water with a volume of (V1 - V0) into the pile hole (1); Step 3: After the first batch of mud with a volume of V0 is injected into the pile hole (1), the mud preparation device (4) continues to prepare and fill the mud with the same specific gravity for rapid mud replenishment in case of mud leakage; Step 4: Start the punching machine (15). When the hole depth increases, the length measuring device (16) measures a new L value and sends a signal to the first control system (5). After receiving the signal, the first control system (5) calculates the new mud specific gravity γ′0 in the mud preparation device (4) and calculates the new mud weight m′0. Then, the first control system (5) controls the filler (6) to add soil with a weight of m′ t weight to the mud preparation device (4): m′ t = m′0 - m s -m t ; m′0 = γ′0·ρ s ·V0; Step 5: The gravity sensor (2) sends the γ2 value to the first control system (5) and the second control system (8); Step 6: When a certain volume of mud is used up in the mud preparation device (4), the first control system (5) controls the mud making system to reconfigure the corresponding volume of mud according to the displacement data of the fourth mud pipeline (12) measured by the displacement detector (19); Step 7: When there is an advance in the depth of the pile hole (1), the length measuring device (16) sends the latest maximum suspended length L of the steel cable to the second control system (8). The second control system (8) calculates the difference between the new and old maximum suspended lengths as ΔL, and calculates that the amount of mud to be replenished into the pile hole (1) is V4. The first control system (5) controls the mud preparation device (4) to inject a volume of V'4 mud into the pile hole (1), then: Repeat Step 6 to replenish the mud preparation device (4).

6. A method for adjusting the effect of slurry wall protection of bored cast-in-place piles according to claim 5, characterized in that: In step five, when the value of γ2 is too small and does not meet the requirements of the mud index, the first control system (5) controls the mud preparation device (4) to inject mud into the pile hole (1) until the gravity sensor (2) shows that the value of γ2 meets the requirements, and then stops. The maximum injection volume of high-concentration mud is controlled to be When the value of γ2 is too large and does not meet the requirements of the mud index, the second control system (8) controls the water storage system (7) to supply water into the pile hole (1) until the gravity sensor (2) shows that the value of γ2 meets the requirements, and then stops. The maximum water injection volume is controlled to be 7. A method for adjusting the mud wall protection effect of a bored cast-in-place pile according to claim 6, characterized in that: Step 6 specifically is that when the first control system (5) receives that the displacement detector (19) measures that the mud preparation device (4) inputs a high-concentration mud with a volume of V3 into the pile hole (1), the first control system (5) controls the filler (6) to supplement m tb weight of soil and controls the water storage system (7) to supplement V sb volume of water to the mud preparation device (4):

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