Method for testing pull-out force of rotary drilling rig and test tool thereof

Abstract

The application provides a rotary drilling rig pulling force test method, comprising the following steps: preparing a rotary drilling rig, connecting a driving device of the rotary drilling rig with a power head of the rotary drilling rig through a rope; preparing a test tool, the test tool comprising a connecting assembly and a tension sensor, fixing the tension sensor on the ground, connecting one end of the connecting assembly with the tension sensor, and connecting the other end of the connecting assembly with the power head; starting a data acquisition system to acquire real-time force data of the tension sensor; adjusting the driving device to a set output power, so that the driving device tightens the rope to drive the power head to move away from the ground, and a peak value of the real-time force data is a test value of the data acquisition system; and calculating the pulling force of the rotary drilling rig according to a formula. The test method can continuously acquire the pulling force data of the whole process in real time, and the actual pulling force is obtained by using the peak value, so that the data precision is high, the test method is simple, and the safety is high. The application also relates to a test tool.

Description

Technical Field

[0001] This invention relates to the field of foundation construction technology, and in particular to a method and testing fixture for testing the pull-out force of a rotary drilling rig. Background Technology

[0002] like Figure 1 As shown, the conventional test method for the CFA lifting force of existing rotary drilling rigs adopts the power head 31 suspended weight counterweight test method. According to the theoretical lifting load of different rotary drilling rigs, weight counterweight blocks 32 of corresponding tonnage are selected; the weight counterweight blocks 32 are hoisted and connected to the lower end of the rotary drilling rig power head 31 using a pin shaft; the rotary drilling rig is started, and the pressure winch operating handle and the main winch operating handle are slowly operated to lift the power head 31 upward. The operator visually observes the state of the weight in real time. When the weight is observed to leave the ground, the pressure winch operating handle and the main winch operating handle are quickly pushed to the middle position to maintain the current force state. The pressure is stabilized and left to stand for 5 minutes to complete the CFA lifting force test. However, the existing test method has the following disadvantages: (1) The test accuracy is low. It can only rely on visual judgment of the critical point of the weight leaving the ground. It cannot accurately measure the true peak lifting force. It can only qualitatively determine whether the load corresponding to the weight counterweight 32 has been reached. It cannot output continuous tensile force data and complete force curve; (2) Different weight counterweights 32 are required for rotary drilling rigs with different lifting loads. Rotary drilling rigs with large lifting loads need more weight counterweights 32 to be stacked, which is troublesome to transport, thus making the lifting force test time-consuming and laborious. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a method for testing the pull-out force of a rotary drilling rig. This method can continuously collect tensile force data throughout the entire process in real time and use peak value calculation to obtain the actual pull-out force. The data accuracy is high, and the test method is simple and safe.

[0004] This invention provides a method for testing the pull-out force of a rotary drilling rig, the method comprising: Step 1: Prepare the rotary drilling rig and connect the drive unit of the rotary drilling rig to the power head of the rotary drilling rig via a rope; Step 2: Prepare the test fixture, which includes a connecting component and a tension sensor. Fix the tension sensor to the ground. Connect one end of the connecting component to the tension sensor and the other end of the connecting component to the power head. Step 3: Activate the data acquisition system to collect real-time force data from the tension sensor; adjust the drive device to the set output power, causing the drive device to tighten the rope and drive the power head to move away from the ground. The peak value of the real-time force data is the test value of the data acquisition system. ; The pulling force of the rotary drilling rig is calculated using the following formula. :

[0005] in, The weight of the power head is [the weight of the power head]. The weight of the connecting component.

[0006] In one embodiment, in step 3, the drive device includes an engine, and the set output power is the maximum output power of the engine.

[0007] In one embodiment, in step 3, the driving device further includes a main winch and a pressure winch, and the rope includes a first wire rope and a second wire rope. One end of the first wire rope is connected to the main winch, and the other end of the first wire rope is connected to the power head. One end of the second wire rope is connected to the pressure winch, and the other end of the second wire rope is connected to the power head. The main winch and the pressure winch simultaneously tighten the first wire rope and the second wire rope, respectively.

[0008] In one embodiment, during the preparation of the rotary drilling rig in step 1, the coolant temperature of the rotary drilling rig is brought to a first operating temperature, and the temperature of the hydraulic system of the rotary drilling rig is brought to a second operating temperature.

[0009] In one embodiment, prior to step 2, the power head is adjusted to the maximum working radius of the rotary drilling rig in its slewing state.

[0010] The present invention also relates to a test fixture using the above-described test method, comprising a connecting component, a tension sensor, and a fixing base. One end of the connecting component is used to connect to the power head of a rotary drilling rig, the other end of the connecting component is connected to the tension sensor, and the end of the tension sensor away from the connecting component is connected to the fixing base, which is fixedly connected to the ground.

[0011] In one embodiment, the fixing base includes a base, two first connecting plates and two second connecting plates. The base is provided with a receiving cavity. Each of the first connecting plates is disposed in the receiving cavity, intersecting with each of the second connecting plates. The intersection area of ​​the two first connecting plates and the two second connecting plates forms an installation area. The tension sensor is detachably connected to the installation area.

[0012] In one embodiment, the base includes a fixed cylinder and a base plate. The fixed cylinder has a hollow structure, and the base plate is connected inside the fixed cylinder. The accommodating cavity is formed between the end of the fixed cylinder near the connecting assembly and the base plate.

[0013] In one embodiment, the connecting assembly includes at least two hooks and at least two straps, each hook being detachably connected to the power head, one end of each strap being connected to each hook, and the other end of each strap being connected to the tension sensor.

[0014] In one embodiment, the testing fixture further includes a data acquisition system electrically connected to the tension sensor, the data acquisition system being used to read and process the electrical signals of the tension sensor.

[0015] The method for testing the pull-out force of rotary drilling rigs of the present invention can continuously collect tensile force data throughout the entire process in real time and automatically capture the peak pull-out force to obtain accurate test values. By substituting the formula, the resistance correction calculation is completed to obtain the actual lifting force value. The measurement quantification is high and the test accuracy is significantly improved. It can avoid the operational errors caused by the lag of human judgment in the existing technology. There is no need to configure and hoist large tonnage weights and counterweights, eliminating the safety risks of weight falling or uneven load instability and improving the safety of the test. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure for conducting a pull-out force test on a rotary drilling rig using existing technology.

[0018] Figure 2 This is a schematic diagram of the rotary drilling rig of the present invention undergoing a pull-out force test.

[0019] Figure 3 yes Figure 2 A magnified structural diagram of point A in the middle.

[0020] Figure 4 This is a schematic diagram of the structure of the fixed base and the tension sensor of the present invention.

[0021] Reference numerals: Rotary drilling rig - 10; Power head - 11; Drive sleeve - 11a; Rope - 12; First wire rope - 121; Second wire rope - 122; Main winch - 13; Pressurized winch - 14; Mast - 15; Anchor frame - 151; Luffing cylinder - 16; Support assembly - 17; Test fixture - 20; Reception cavity - 201; Installation area - 202; Connecting assembly - 21; Hook - 211; Sling - 212; Shackle - 213; Body - 213a; Locking pin - 213b; Tension sensor - 22; Fixed seat - 23; Base - 231; Fixed cylinder - 2311; Base plate - 2312; First connecting plate - 232; Second connecting plate - 233; Connecting pin - 234; Limiting plate - 235. Detailed Implementation

[0022] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0025] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0026] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0027] like Figures 2 to 4As shown, the CFA method (continuous auger drilling method) of rotary drilling rig 10 mainly utilizes a long auger drill rod to drill holes, injects concrete through the hollow drill rod, and forms a pile body while pulling out the drill rod. Since the CFA method involves pumping concrete while uniformly raising the long auger drill rod, the success or failure of pile formation is controlled by the matching of the pulling force and the drilling speed. Therefore, the rotary drilling rig 10 must undergo a pulling force load test when it leaves the factory and is accepted as special equipment at the construction site. In this embodiment, the rotary drilling rig 10 is equipped with the CFA method. When conducting a pull-out force test on the rotary drilling rig 10, a test fixture 20 is required. The test fixture 20 includes a connecting component 21, a tension sensor 22, and a fixing base 23. One end of the connecting component 21 is connected to the power head 11 of the rotary drilling rig 10, and the other end is connected to the tension sensor 22. The end of the tension sensor 22 away from the connecting component 21 is connected to the fixing base 23, which is fixedly connected to the ground. The fixing base 23 is used to fix the tension sensor 22, resisting the upward pull-out load of the rotary drilling rig 10. The tension sensor 22 converts the applied tension or pressure into a measurable electrical signal for easy acquisition, reading, and processing. The tension sensor 22 directly reflects the pull-out force without the need for additional sensors for conversion, resulting in high data accuracy. Furthermore, using the tension sensor 22 avoids the need for extensive wiring connections and prevents damage from impacts.

[0028] Preferably, the connecting assembly 21 includes at least two hooks 211 and at least two slings 212. Each hook 211 is detachably connected to the power head 11. Specifically, the hook 211 is detachably connected to the drive sleeve 11a of the power head 11. When a pull-out force test is required, the hook 211 is installed on the drive sleeve 11a. After the pull-out force test is completed, the hook 211 is removed. The hook 211 is preferably a self-locking hook. One end of each sling 212 is connected to each hook 211, and the other end of each sling 212 is connected to the tension sensor 22. For example, there are two or four hooks 211, and two or four slings 212. The number of hooks 211 matches the number of slings 212. Since the drive sleeve 11a of the power head 11 is a cylindrical structure, in this embodiment, there are preferably four hooks 211 and four slings 212. The distance between any two adjacent hooks 211 is equal to improve the stability of the suspension. The connecting assembly 21 also includes a shackle 213, which includes a body 213a and a locking pin 213b. The body 213a includes an arc-shaped bearing section, a first straight lug end, and a second straight lug end. The first straight lug end and the second straight lug end are respectively fixedly connected to the two ends of the arc-shaped bearing section. The first straight lug end has a through-hole with a smooth inner wall. The second straight lug end has a through-hole with a threaded inner wall. The axis of the first pin hole coincides with the axis of the second pin hole and is coaxial. The locking pin 213b passes through the first pin hole, the tension sensor 22, and the second pin hole in sequence. The threaded section of the locking pin 213b engages with the threaded structure of the second pin hole. The locking pin 213b spans the first straight lug end and the second straight lug end to close the opening side of the body 213a, forming a closed annular bearing cavity for threading the sling 212. The shackle 213 is used to connect the sling 212 and the tension sensor 22. The shackle 213 is easy to disassemble and assemble, which can improve assembly efficiency and save time when performing a pull-out force test on the rotary drilling rig 10.

[0029] Preferably, the fixing base 23 includes a base 231, two first connecting plates 232 and two second connecting plates 233. The base 231 is provided with a receiving cavity 201. Adjacent first connecting plates 232 are spaced apart, and adjacent second connecting plates 233 are spaced apart. Each first connecting plate 232 intersects with each second connecting plate 233. The intersection area of ​​the two first connecting plates 232 and the two second connecting plates 233 forms an installation area 202. The tension sensor 22 is detachably connected to the installation area 202. Specifically, the two first connecting plates 232 are respectively provided with connecting holes, and the two connecting holes are coaxially arranged. The fixing base 23 also includes a connecting pin 234. When the end of the tension sensor 22 away from the power head 11 is set in the mounting area 202, the connecting pin 234 passes through the connecting hole and the tension sensor 22 in sequence to fix the tension sensor 22 to the fixing base 23. In this embodiment, the mounting area 202 formed by the intersection of the two first connecting plates 232 and the two second connecting plates 233 has sufficient space, which facilitates the installation and disassembly of the tension sensor 22. In addition, the fixing base 23 also includes two limiting plates 235. Each limiting plate 235 is fixedly connected to the side of each first connecting plate 232 away from the installation area 202. Each limiting plate 235 is provided with a limiting hole. The two ends of the connecting pin 234 are respectively set in the limiting hole, so that each limiting plate 235 limits the connecting pin 234 in the vertical and horizontal directions, so as to prevent the connecting pin 234 from moving or falling off, thereby affecting the stability of the connection of the tension sensor 22.

[0030] Preferably, the base 231 includes a fixing cylinder 2311 and a base plate 2312. The fixing cylinder 2311 is preferably a steel casing and has a hollow structure. The base plate 2312 is connected inside the fixing cylinder 2311. The base plate 2312 and the fixing cylinder 2311 can be connected by welding, which can save costs. The end of the fixing cylinder 2311 near the connecting component 21 forms the receiving cavity 201 between it and the base plate 2312. The first connecting plate 232 and the second connecting plate 233 are both disposed in the receiving cavity 201. The base plate 2312 plays a load-bearing role and is used to support the first connecting plate 232 and the second connecting plate 233. The other end of the fixing cylinder 2311 is buried 50 meters below the ground.

[0031] Preferably, the testing fixture 20 further includes a data acquisition system for reading and processing the electrical signals of the tension sensor 22; the data acquisition system also includes a data acquisition instrument, which is electrically connected to the tension sensor 22 to acquire and read the electrical signals.

[0032] This invention also relates to a method for testing the pull-out force of a rotary drilling rig. This method tests the pull-out force of the rotary drilling rig under CFA (Continuous Availability and Flexibility) conditions. When conducting the pull-out force test on a rotary drilling rig 10 using the CFA method, the test is performed through the power head. Because the pull-out force of CFA drilling first acts on the power head and is then transmitted to the drill rod, and the drill rod itself does not generate any active pull-out thrust, but is merely a passively tensile transmission rod, only the pull-out force of the power head needs to be tested. This testing method requires the use of the aforementioned testing fixture 20. The testing method includes: Step 1: Prepare the rotary drilling rig 10, ensuring the coolant temperature reaches the first operating temperature, which is the same as the engine coolant temperature. The first operating temperature is 80℃~95℃, preferably 80℃, 85℃, 90℃, or 95℃. Ensure the hydraulic system temperature reaches the second operating temperature, which is 55℃~70℃, preferably 55℃, 60℃, 65℃, or 70℃. Connect the drive unit of the rotary drilling rig 10 to the power head 11 via rope 12. The initial position for the pull-out force test (or assessment) is the vertical drilling state of the mast 15. Then adjust the power head 11 to the maximum working radius of the rotary drilling rig 10 in its slewing state. The maximum working radius refers to the maximum horizontal distance that the central axis of the power head 11 can reach relative to the rotation center of the entire machine when the rotary mechanism of the rotary drilling rig 10 is rotating.

[0033] The maximum working radius of the power head 11 is adjusted by the luffing cylinder 16. The drive end of the luffing cylinder 16 is connected to the mast 15. When the luffing cylinder 16 extends, it drives the mast 15 to move. Since the power head 11 is connected to the mast 15, it also moves with the mast 15. In this embodiment, the power head 11 is adjusted to the maximum working radius because, theoretically, the lifting force for the maximum working radius test is the same as that for the minimum working radius test. However, the maximum working radius represents the extreme working condition of the vehicle, which places more stringent demands on vehicle performance evaluation. Therefore, the power head 11 is directly adjusted to its maximum working radius for testing.

[0034] A support assembly 17 is also provided at the bottom of the mast 15. The support assembly 17 includes outrigger cylinders and outrigger seats. The outrigger cylinders are fixedly connected to the end of the mast 15 (in the vertical state) near the ground. The outrigger seats are connected to the drive end of the outrigger cylinders. When the drive end of the outrigger cylinders extends, the outrigger seats contact the ground and support the mast 15 to increase the stability of the mast 15. Before conducting the lifting force test, the drive end of the outrigger cylinders needs to be extended so that the support seats are supported on the ground.

[0035] Step 2: Prepare the test fixture 20, positioning it in the center of the shadow cast by the power head 11. The test fixture 20 includes a connecting component 21 and a tension sensor 22. Fix the tension sensor 22 to the ground. Connect one end of the connecting component 21 to the tension sensor 22 and the other end of the connecting component 21 to the power head 11. Refer to the above description for the specific connection structure of the test fixture 20.

[0036] Step 3: Activate the data acquisition system to collect real-time force data from the tension sensor 22. Adjust the drive device to the set output power, causing the drive device to tighten the rope 12 to drive the power head 11 to move away from the ground. The peak value of the real-time force data is the test value of the data acquisition system. ; Calculate the pulling force of the rotary drilling rig 10 using the following formula. :

[0037] in, The weight of the power head 11 is expressed in kN. The weight of the connecting component 21 is expressed in kN. The weight of the connecting component 21 is the sum of the weight of the hook 211, the weight of the sling 212, and the weight of the shackle 213.

[0038] Preferably, the drive unit includes an engine, and the set output power is the engine's maximum output power; for example, the engine has ten gears, one of which is the lowest gear, i.e., the engine's minimum output power, and the tenth gear is the highest gear, i.e., the engine's maximum output power. Therefore, when adjusting the drive unit, the engine is directly adjusted to the tenth gear for testing. In addition, this testing method can also be used to test the lifting force of the engine at different gears.

[0039] The drive unit also includes a main winch 13 and a pressure winch 14. The rope 12 includes a first wire rope 121 and a second wire rope 122. One end of the first wire rope 121 is connected to the main winch 13, that is, the drum of the main winch 13. The other end of the first wire rope 121 passes through the main pulley of the anchor frame 151 and the moving pulley group of the power head 11 in sequence, and is finally fixed on a fixed anchor point. One end of the second wire rope 122 is connected to the pressure winch 14, that is, the drum of the pressure winch 14. The other end of the second wire rope 122 passes through the pressure fixed pulley group of the anchor frame 151 and the pressure moving pulley group of the power head 11 in sequence, and is finally fixed on another fixed anchor point. During the pull-out force test, after adjusting the engine to its maximum output power, slowly operate the operating handles of the pressure winch 14 and the main winch 13, so that the main winch 13 and the pressure winch 14 simultaneously tighten the first wire rope 121 and the second wire rope 122, respectively. Observe the maximum value of the real-time force data on the data acquisition system, which is the test value of the aforementioned data acquisition system. .

[0040] Step 4: Repeat step 3 above to complete at least three sets of valid data and record them.

[0041] The method for testing the pull-out force of a rotary drilling rig of the present invention can continuously acquire the tension value of the rope 12 in real time. The pull-out force measurement result is closer to the actual force on the rope 12. The tension sensor 22 can accurately capture the instantaneous tension peak at the moment of pull-out. Combined with the data acquisition system, the actual pull-out force value can be analyzed. The test results are highly reliable, avoiding the operational errors caused by the lag of human judgment in the prior art, and eliminating the safety problems caused by the falling weight or the instability of the load in the prior art. In addition, the use of the test fixture 20 makes the rotary drilling rig 10 easy to disassemble and assemble during the pull-out force test, saving time, and will not affect the original structure or working performance of the rotary drilling rig 10, thus improving the safety of the test.

[0042] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for testing the pull-out force of a rotary drilling rig, characterized in that, The testing method includes: Step 1: Prepare the rotary drilling rig (10) and connect the drive device of the rotary drilling rig (10) to the power head (11) of the rotary drilling rig (10) via a rope (12); Step 2, prepare the test fixture (20), which includes a connecting component (21) and a tension sensor (22). Fix the tension sensor (22) to the ground. One end of the connecting component (21) is connected to the tension sensor (22), and the other end of the connecting component (21) is connected to the power head (11). Step 3: Activate the data acquisition system to collect real-time force data from the tension sensor (22); adjust the drive device to the set output power so that the drive device tightens the rope (12) to drive the power head (11) to move away from the ground. The peak value of the real-time force data is the test value of the data acquisition system. ; The pulling force of the rotary drilling rig (10) is calculated according to the following formula. : in, The weight of the power head (11) is... The weight of the connecting component (21).

2. The method for testing the pull-out force of a rotary drilling rig as described in claim 1, characterized in that, In step 3, the drive device includes an engine, and the set output power is the maximum output power of the engine.

3. The method for testing the pull-out force of a rotary drilling rig as described in claim 2, characterized in that, In step 3, the driving device further includes a main winch (13) and a pressure winch (14). The rope (12) includes a first wire rope (121) and a second wire rope (122). One end of the first wire rope (121) is connected to the main winch (13), and the other end of the first wire rope (121) is connected to the power head (11). One end of the second wire rope (122) is connected to the pressure winch (14), and the other end of the second wire rope (122) is connected to the power head (11). The main winch (13) and the pressure winch (14) simultaneously tighten the first wire rope (121) and the second wire rope (122).

4. The method for testing the pull-out force of a rotary drilling rig as described in claim 1, characterized in that, When preparing the rotary drilling rig (10) in step 1, the coolant temperature of the rotary drilling rig (10) is brought to the first working temperature, and the temperature of the hydraulic system of the rotary drilling rig (10) is brought to the second working temperature.

5. The method for testing the pull-out force of a rotary drilling rig as described in claim 1, characterized in that, Before step 2, adjust the power head (11) to the maximum working radius of the rotary drilling rig (10) in its rotation state.

6. A test fixture (20) using the test method according to any one of claims 1 to 5, characterized in that, The device includes a connecting assembly (21), a tension sensor (22), and a mounting base (23). One end of the connecting assembly (21) is used to connect to the power head (11) of the rotary drilling rig (10), and the other end of the connecting assembly (21) is connected to the tension sensor (22). The end of the tension sensor (22) away from the connecting assembly (21) is connected to the mounting base (23), and the mounting base (23) is fixedly connected to the ground.

7. The test fixture (20) as described in claim 6, characterized in that, The fixing base (23) includes a base (231), two first connecting plates (232) and two second connecting plates (233). The base (231) is provided with a receiving cavity (201). Each of the first connecting plates (232) is intersected with each of the second connecting plates (233) in the receiving cavity (201). The intersection area of ​​the two first connecting plates (232) and the two second connecting plates (233) forms an installation area (202). The tension sensor (22) is detachably connected to the installation area (202).

8. The test fixture (20) as described in claim 6, characterized in that, The base (231) includes a fixed cylinder (2311) and a base plate (2312). The fixed cylinder (2311) is a hollow structure. The base plate (2312) is connected inside the fixed cylinder (2311). The end of the fixed cylinder (2311) near the connecting assembly (21) forms the receiving cavity (201) with the base plate (2312).

9. The test fixture (20) as described in claim 6, characterized in that, The connecting assembly (21) includes at least two hooks (211) and at least two slings (212). Each hook (211) is detachably connected to the power head (11). One end of each sling (212) is connected to each hook (211), and the other end of each sling (212) is connected to the tension sensor (22).

10. The test fixture (20) as described in claim 1, characterized in that, The test fixture (20) also includes a data acquisition system, which is electrically connected to the tension sensor (22) and is used to read and process the electrical signals of the tension sensor (22).

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