In-hole slurry balance regulation and control method for hydraulic combined rotary drilling pile hole construction

Abstract

The invention discloses an in-hole slurry balance regulation and control method for hydraulic combined rotary drilling pile hole construction. The in-hole slurry balance regulation and control method comprises the following steps that S1, the initial slurry concentration in a pile hole is measured and recorded; s2, in the high-pressure water jet spraying operation period, the amount of clear water injected into the pile hole is monitored in real time; s3, on the basis of a slurry concentration balance formula, the material feeding rate needed for maintaining the slurry concentration is calculated; S4, according to the material feeding rate, materials similar to slurry components are fed into the pile hole; s5, measuring the slurry concentration after the materials are fed, comparing the slurry concentration with the initial slurry concentration, and if the slurry concentration is inconsistent with the initial slurry concentration, readjusting the material feeding rate until the slurry concentration is balanced; according to the method, the material feeding rate for maintaining slurry balance is calculated according to the amount of water injected during high-pressure water jet injection work, and corresponding materials are fed into the hole according to the material feeding rate, so that the balance of the slurry concentration in the hole is maintained, and the construction safety of the pile hole is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction engineering, and in particular to a method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole. Background Art

[0002] With the increase in large-scale bridge projects across rivers and straits, pile foundation construction faces challenges in hard rock and complex formations. Traditional rotary drilling rigs generally have problems such as "unable to drill, slow to drill, large wear, and poor formation adaptability" in hard rock formations, which leads to extended construction periods, severe wear of drill bits, and increased costs, which seriously restricts construction periods and quality. In order to improve rock breaking efficiency, high-pressure water jet technology is introduced to pre-cut grooves on hard rocks to reduce rock breaking energy consumption. However, a large amount of clean water is injected into the high-pressure water jet during the operation process, resulting in the dilution of the mud concentration in the pile hole, destroying the liquid support effect of the mud on the hole wall, and easily causing the risk of hole wall collapse. The existing technology lacks a means of dynamically controlling the mud concentration, and only relies on experience to put in materials. There are problems such as rough calculation, delayed response, and concentration imbalance, which seriously affect construction safety and efficiency. Therefore, there is an urgent need for an accurate and dynamic mud balance control method to ensure the efficient application of high-pressure water jet technology. Summary of the invention

[0003] In order to solve the above problems, the present application provides a method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole. According to the amount of water injected during the high-pressure water jet spraying operation, the material delivery rate for maintaining the mud balance is calculated, and corresponding materials are delivered into the hole accordingly to maintain the balance of the mud concentration in the hole and ensure the safety of the pile hole construction. The technical solution is as follows:

[0004] The present application provides a method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole, comprising the following steps:

[0005] S1: Measure and record the initial mud concentration in the pile hole;

[0006] S2: During the high-pressure water jetting operation, real-time monitoring of the amount of clean water injected into the pile hole;

[0007] S3: Based on the mud concentration balance formula, calculate the material delivery rate required to maintain the mud concentration; the mud concentration balance formula is:

[0008]

[0009] Among them, c 泥浆 is the mud volume concentration; V 固体 The solid volume in the initial mud; V 总 is the total volume of initial mud; V 物料 V is the volume of material to be put in; 水 Water injection amount for high pressure water jet;

[0010] S4: according to the material delivery rate, delivering materials with similar composition to the mud into the pile hole;

[0011] S5: Measure the mud concentration after adding materials and compare it with the initial mud concentration. If they are inconsistent, readjust the material addition rate until the mud concentration is balanced.

[0012] For example, in the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the water injection volume V of the high-pressure water jet is 水 Calculated by the following formula:

[0013]

[0014] Where d is the diameter of the water jet nozzle; φ is the velocity coefficient, which is 0.98 to 1; P is the water jet pressure; ρ 水 is the density of water; t is the high-pressure water jet cutting operation time.

[0015] For example, in the method for controlling the slurry balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the material delivery rate v 物料 The calculation formula is:

[0016]

[0017] Among them, ρ 物料 is the density of the put material.

[0018] For example, in the method for controlling the balance of mud in a construction hole of a hydraulic combined rotary drilling pile provided in one embodiment, in step S3, the material volume V 物料 Determined by the following formula:

[0019] m 物料 =ρ 物料 ·V 物料 =v 物料 ·t'

[0020] Among them, m 物料 is the material mass, and t' is the delivery time.

[0021] For example, in the method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, in step S5, if the mud concentration has not reached equilibrium, steps S3 to S5 are re-executed until the mud concentration is consistent with the initial value.

[0022] For example, in the method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, the material is bentonite or clay, and its density is similar to that of the solid components in the mud.

[0023] For example, in the method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, the high-pressure water jet pressure P ranges from 20 to 50 MPa, and the nozzle diameter d ranges from 2 to 10 mm.

[0024] For example, in the method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, the mud concentration is measured by a real-time density sensor or a sampling analysis method.

[0025] For example, in the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the material delivery is performed by an automated feeding system, and the feeding rate is dynamically matched with the calculated value.

[0026] For example, in the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the automatic feeding system is linked with the high-pressure water jet equipment to adjust the material delivery rate in real time according to the water injection volume.

[0027] The beneficial effects brought about by a method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole provided in some embodiments of the present application are as follows: the present application realizes real-time dynamic control of mud concentration by formulating the water injection volume and material delivery rate, thereby avoiding errors caused by manual experience and ensuring the stability of the hole wall; based on the formulaic correlation of parameters such as water jet pressure and nozzle diameter, it accurately matches the requirements of different formations and enhances technical adaptability; through precise material delivery and low-energy water jet technology, it reduces resource waste and construction costs; the present application greatly improves the overall stability of the hole wall during the hydraulic combined rotary drilling pile hole construction process and the accuracy of the material delivery rate calculation used to maintain mud concentration balance, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a flow chart of the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile hole in this application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] The present application provides a method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole, such as Figure 1 As shown, the following steps are included:

[0033] S1: measuring and recording the initial mud concentration in the pile hole; specifically, at the beginning of the hydraulic combined rotary drilling rig construction operation, the mud concentration in the pile hole is measured and recorded to obtain the initial mud concentration;

[0034] S2: During the high-pressure water jetting operation, the amount of clean water injected into the pile hole is monitored in real time; specifically, as the high-pressure water jetting operation is performed, a large amount of clean water is injected into the pile hole to begin diluting the mud concentration in the pile hole. In order to ensure the overall stability of the hole wall during the hydraulic combined rotary drilling pile hole construction process, a certain amount of material needs to be placed in the pile hole to maintain the balance of mud concentration;

[0035] S3: According to the balance of mud concentration in the pile hole before and after the hydraulic combined rotary drilling rig construction, the material delivery rate required to maintain the mud concentration is calculated based on the mud concentration balance formula; the mud concentration balance formula is:

[0036]

[0037] Among them, c 泥浆 V is the volume concentration of mud, which should be kept consistent before and after construction; 固体 The solid volume in the initial mud; V 总is the total volume of initial mud; V 物料 V is the volume of material to be put in; 水 Water injection amount for high pressure water jet;

[0038] The high-pressure water jet injection volume V 水 Calculated by the following formula:

[0039]

[0040] Where d is the diameter of the water jet nozzle; φ is the velocity coefficient. In the actual flow process, there are various losses when the liquid flows in the nozzle. It is usually taken as 0.98~1; P is the water jet pressure; ρ 水 is the density of water; t is the high-pressure water jet cutting operation time. The high-pressure water jet pressure P ranges from 20 to 50 MPa, and the nozzle diameter d is 2 to 10 mm, which optimizes the balance between rock breaking efficiency and energy consumption and adapts to the needs of different hard rock formations.

[0041] The material delivery rate v 物料 The calculation formula is:

[0042]

[0043] Among them, ρ 物料 is the density of the put material.

[0044] Material volume V 物料 Determined by the following formula:

[0045] m 物料 =ρ 物料 ·V 物料 =v 物料 ·t'

[0046] Among them, m 物料 is the material mass, and t' is the delivery time.

[0047] S4: according to the material delivery rate, delivering materials with similar composition to the mud into the pile hole through a material supply station on the ground;

[0048] S5: Measure the mud concentration after adding the material and compare it with the initial mud concentration. If they are the same, it means that the calculated material addition rate is valid; if they are not the same, readjust the material addition rate until the mud concentration is balanced. If the mud concentration is not balanced, re-execute steps S3 to S5 until the mud concentration is consistent with the initial value.

[0049] The method for controlling mud balance in a hydraulically combined rotary drilling pile hole construction hole of the present application systematically solves the problem of mud imbalance caused by water injection dilution through a step-by-step mud balance control process and calculation formula, thereby ensuring hole wall stability and construction safety; the water injection volume formula based on water jet parameters (nozzle diameter, pressure, time) quantifies the clean water injection volume, provides accurate input for subsequent material calculations, and avoids empirical estimation errors; through the material delivery rate formula, the mud concentration, water injection volume, and material density are dynamically linked to achieve precise delivery rate control, thereby avoiding concentration fluctuations caused by excessive or insufficient delivery; through concentration comparison and adjustment in S5, the delivery error is corrected in real time to ensure that the mud concentration is ultimately balanced, thereby enhancing the robustness of the method.

[0050] For example, in the method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, the material is bentonite or clay, and its density is similar to that of the solid components in the mud.

[0051] According to the above embodiment, by limiting the material to bentonite or clay, the density of which matches the solid components of the mud, foreign matter is prevented from interfering with the mud performance and the chemical stability of the hole wall is maintained.

[0052] For example, in the method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole provided in one embodiment, the mud concentration is measured by a real-time density sensor or a sampling analysis method.

[0053] According to the above embodiments, the present application provides two measurement methods: density sensor or sampling analysis, which take into account both real-time and accuracy, adapt to the data collection needs of complex construction environments, and ensure data reliability.

[0054] For example, in the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the material delivery is performed by an automated feeding system, and the feeding rate is dynamically matched with the calculated value.

[0055] According to the above embodiment, the automated feeding system is dynamically matched with the calculation rate to realize unmanned operation of material delivery, reduce delays in manual operation, and improve construction continuity.

[0056] For example, in the method for controlling the mud balance in the construction hole of the hydraulic combined rotary drilling pile provided in one embodiment, the automatic feeding system is linked with the high-pressure water jet equipment to adjust the material delivery rate in real time according to the water injection volume.

[0057] According to the above embodiment, high-pressure water jet rock breaking is combined with an automated feeding system to reduce drill bit wear and shorten the construction period. By linking the automated feeding system with the high-pressure water jet equipment, the material delivery rate is automatically adjusted according to the real-time water injection volume to achieve a synchronous response of "water injection-feeding", reduce manual intervention, and improve operation continuity.

[0058] Although the implementation scheme of the present application has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes, and it can be fully applicable to various fields suitable for the present application. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for controlling the balance of mud in a hydraulic combined rotary drilling pile hole construction hole, characterized in that: The following steps are involved: S1: Measure and record the initial mud concentration in the pile hole; S2: During the high-pressure water jetting operation, real-time monitoring of the amount of clean water injected into the pile hole; S3: Based on the mud concentration balance formula, calculate the material delivery rate required to maintain the mud concentration; the mud concentration balance formula is: Among them, c 泥浆 is the mud volume concentration; V 固体 The solid volume in the initial mud; V 总 is the total volume of initial mud; V 物料 V is the volume of material to be put in; 水 The amount of water injected for high pressure water jet; S4: according to the material delivery rate, delivering materials with similar composition to the mud into the pile hole; S5: Measure the mud concentration after adding materials and compare it with the initial mud concentration. If they are inconsistent, readjust the material addition rate until the mud concentration is balanced.

2. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: The high-pressure water jet injection volume V 水 Calculated by the following formula: Where d is the diameter of the water jet nozzle; φ is the velocity coefficient, which is 0.98 to 1; P is the water jet pressure; ρ 水 is the density of water; t is the high-pressure water jet cutting operation time.

3. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 2, characterized in that: The material delivery rate v 物料 The calculation formula is: Among them, ρ 物料 is the density of the put material.

4. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 3, characterized in that: In step S3, the material volume V 物料 Determined by the following formula: m 物料 =ρ 物料 ·V 物料 =v 物料 ·t' Among them, m 物料 is the material mass, and t' is the delivery time.

5. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: In step S5, if the mud concentration has not reached equilibrium, steps S3 to S5 are re-executed until the mud concentration is consistent with the initial value.

6. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: The material is bentonite or clay, and its density is similar to that of the solid components in the mud.

7. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 2, characterized in that: The pressure P of the high-pressure water jet is in the range of 20 to 50 MPa, and the nozzle diameter d is in the range of 2 to 10 mm.

8. The method for controlling the mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: The mud concentration is measured by a real-time density sensor or a sampling analysis method.

9. The method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: The material delivery is performed through an automated feeding system, and the feeding rate is dynamically matched with the calculated value.

10. The method for controlling mud balance in a hydraulic combined rotary drilling pile hole construction hole according to claim 1, characterized in that: The automatic feeding system is linked with the high-pressure water jet equipment to adjust the material feeding rate in real time according to the water injection volume.

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