A simulation test device and test method for high-pressure water jet pile formation in complex strata

Abstract

The invention discloses a complex stratum high-pressure water jet pile forming simulation test device and test method, which relates to the technical field of civil engineering simulation test, and comprises a transparent model groove, in which transparent simulated rock and soil are filled; a high-pressure water jet pile forming device is arranged directly above the transparent model groove; the high-pressure water jet pile forming device comprises a drill rod and a liquid supply device, and the top of the drill rod is connected to the liquid supply device through a pipeline; the drill rod is connected to a vertical moving component that drives the drill rod to move vertically; an industrial camera is arranged on the side of the transparent model groove, and the industrial camera is aimed at the transparent simulated rock and soil directly below the drill rod. The invention simulates the actual complex stratum by laying and filling transparent rock and soil in the transparent model groove, and then simulates the drilling pile forming process by the high-pressure water jet pile forming device, and the whole process can be photographed and recorded by the industrial camera or directly observed by human eyes. The actual drilling and pouring pile operation can be simulated and tested. Therefore, the device is used to guide the actual drilling and pouring pile operation.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering simulation tests, and in particular to a complex stratum high-pressure water jet pile forming simulation test device and a test method. Background Art

[0002] Pile foundations can be divided into precast piles and cast-in-place piles according to their construction process. Cast-in-place piles have the advantages of low construction noise, low vibration, pile length and diameter can be changed freely according to design requirements, pile tip can reliably enter the bearing layer, and single pile has large bearing capacity. The construction area is often inconvenient for transportation, and the transportation cost of precast piles is extremely high. Therefore, the construction of pile foundations is generally carried out in the form of on-site concrete pouring. Due to the high hardness of the bedrock layer, traditional rotary drilling is difficult to construct. The high-pressure and high-pressure water jet rock cutting technology has been reasonably verified and is often used in pile construction.

[0003] With the increasing demand for high-rise buildings and the rapid development of engineering construction, the construction of cast-in-place piles, which are widely used in construction, in complex strata has received the focus of attention of construction technicians. When constructing in complex strata such as miscellaneous fill, gravel layers with larger particle sizes, crushed stone, block stone and bedrock, from the beginning of drilling to the end of pile formation, it is very easy to cause quality problems or even quality accidents due to the influence of various factors. Therefore, quality control has become a difficult point in construction. However, since the process of pile drilling is located underground, it is difficult to observe or detect the entire process of pile drilling. The model test in the existing technology cannot observe the drilling rock breaking and concrete solidification process, and cannot provide technical guidance for pile drilling. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a complex stratum high-pressure water jet pile forming simulation test device and test method, which can intuitively observe the drilling and rock breaking process in complex strata and simulate the concrete solidification and pile forming process.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0006] Provided is a complex formation high-pressure water jet pile forming simulation test device, which comprises a transparent model tank filled with transparent simulated rock and soil; a high-pressure water jet pile forming device is arranged directly above the transparent model tank; the high-pressure water jet pile forming device comprises a drill rod and a liquid supply device, the top end of the drill rod is connected to the liquid supply device through a pipeline; the drill rod is connected to a vertical movement component for driving the drill rod to move vertically;

[0007] An industrial camera is arranged on the side of the transparent model slot, and the industrial camera is aimed at the transparent simulated rock and soil just below the drill rod.

[0008] Furthermore, a delivery pipe is provided at the center of the drill rod, and the drill rod includes a fixed pipe and a rotating rod connected by a pipe joint, the delivery pipe passes through the fixed pipe and the rotating rod, the top end of the fixed pipe is connected to the vertical moving component, and the fixed pipe is provided with a driving component for driving the rotating rod to rotate; the top end of the delivery pipe is connected to the liquid supply equipment through a pipeline; a drill bit is provided at the bottom end of the rotating rod, and a liquid outlet connected to the delivery pipe is provided at the center of the drill bit; the liquid outlet and the delivery pipe are both coaxial with the drill rod.

[0009] Furthermore, the liquid supply equipment includes a water pump, a hot melt adhesive pump, a water tank and a hot melt adhesive melting tank. The input end of the water pump is connected to the water tank, the input end of the hot melt adhesive pump is connected to the hot melt adhesive melting tank, and the output end of the water pump and the output end of the hot melt adhesive pump are both connected to the delivery pipe.

[0010] Furthermore, it also includes an air pump, a water pump, a hot melt adhesive pump and an air pump connected to the delivery pipe through a four-way joint, and a first valve is arranged between the water pump and the four-way joint; a second valve is arranged between the hot melt adhesive pump and the four-way joint; and a third valve is arranged between the air pump and the four-way joint.

[0011] The setting of the air pump can discharge the water remaining in the pipe after the water pump works, avoiding direct contact between the molten hot melt adhesive and water in the pipe, causing the hot melt adhesive to solidify in the pipe and block the delivery pipe and the liquid outlet.

[0012] Furthermore, the drill bit is also provided with a plurality of auxiliary liquid outlet holes connected with the delivery pipe, the plurality of auxiliary liquid outlet holes are all arranged transversely, and the plurality of auxiliary liquid outlet holes are evenly spaced along the circumference of the liquid outlet holes.

[0013] The setting of auxiliary fluid outlet holes can increase the horizontal jet of fluid to the drill bit. When the water pump is working to assist the drill bit in drilling operations, it is possible to observe whether the horizontally jetted water can help to form a hole, and the state of the rock affected by the horizontal jet during the drilling process can be understood, thereby providing guidance for the specific construction process.

[0014] Furthermore, an inclination angle is set between the axial direction of the auxiliary liquid outlet hole and the radial direction of the delivery pipe, and the inclination direction of the auxiliary liquid outlet hole is opposite to the rotation direction of the drill bit.

[0015] The inclination angle of the auxiliary liquid outlet hole is opposite to the rotation angle of the drill bit. The reverse force of the sprayed water can push the drill bit to rotate, helping the drill bit to drill holes in the rock; at the same time, the side walls of the drilled holes are made uneven, increasing the contact area between the subsequent hot melt adhesive and the holes, thereby enhancing the firmness of the pile foundation.

[0016] Furthermore, the vertical moving assembly includes an extending and lowering rod group, and a horizontal moving assembly is also arranged on the top of the extending and lowering rod group, and the drill rod is arranged on a moving block of the horizontal moving assembly.

[0017] The distribution of transparent rock and soil laid in the transparent model groove is random, and the horizontal moving component can adjust the position of the drill rod, so as to facilitate the study of the pile forming process under different rock and soil distribution conditions.

[0018] A simulation test method for high-pressure water jet pile formation in complex strata, comprising the following steps:

[0019] S1: Transparent rock was prepared using n-dodecane, No. 15 white oil and silica gel powder; transparent soil was prepared using n-dodecane, No. 15 white oil and fused quartz sand;

[0020] S2: Filling transparent rock and transparent soil to simulate real complex strata into the transparent model slot to form transparent simulated rock and soil;

[0021] S3: Start the driving assembly to rotate the rotating rod and the drill bit, and the vertical moving assembly drives the drill rod downward to drill the transparent rock and soil. When the drill bit hits the transparent rock, go to step S4, otherwise go to step S5;

[0022] S4: Start the water pump and open the first valve, the liquid outlet and the auxiliary liquid outlet will spray water to break the transparent rock, and then go to step S5;

[0023] S5: After the drill bit reaches the specified depth, the water pump and the first valve are closed, and the air pump and the third valve are opened; the air pump blows out the remaining water in the pipeline between the four-way joint and the drill bit and the delivery pipe;

[0024] S6: close the air pump and the third valve, open the hot melt adhesive pump and the second valve, and the hot melt adhesive pump pumps the molten hot melt adhesive to the drill bit;

[0025] S7: While the molten hot melt adhesive flows out from the outlet hole and the auxiliary outlet hole, the vertical moving assembly drives the drill rod to move upward to complete the simulated pile pouring operation;

[0026] S8: Wait for the translucent hot melt adhesive in the molten state to solidify. The solidified hot melt adhesive is light yellow. Use an industrial camera to shoot the solidification process of the hot melt adhesive, as well as the drilling operation and simulated pile pouring operation process.

[0027] The beneficial effects of the present invention are:

[0028] The present invention simulates the complex strata in reality by laying and filling transparent rock and soil in a transparent model groove, and then simulates the drilling and piling process by a high-pressure water jet pile forming device. The whole process can be recorded by an industrial camera or directly observed by the human eye. It can be clearly observed that when the high-pressure water jet pile forming device is drilling, the transparent rock and soil are jointly worked by the drill bit and the water jet to form a hole, and the shape of the hole is displayed by using molten hot melt adhesive after the hot melt adhesive is solidified. The changes in the rock and soil when the hole is filled with hot melt adhesive can also be observed. The whole process can be recorded by the human eye or an industrial camera. By changing the parameters of the drilling and piling, the actual drilling and piling operation can be simulated and tested. Therefore, the device can be used to guide the actual drilling and piling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the front structure of the simulation test device;

[0030] Figure 2 The left view structural diagram of the high pressure water jet pile forming equipment is hidden for the simulation test device;

[0031] Figure 3 A schematic diagram of the top view of the structure of the high-pressure water jet pile forming equipment hidden in the simulation test device;

[0032] Figure 4 is a front cross-sectional schematic diagram of a drill bit and a drill rod;

[0033] Figure 5 for Figure 4 Schematic cross-sectional view of section AA;

[0034] Figure 6 Schematic diagram of the simulation test method.

[0035] Among them, 1. transparent model trough; 2. high-pressure water jet pile forming equipment; 21. drill rod; 22. delivery pipe; 23. fixed pipe; 24. rotating rod; 25. drill bit; 26. liquid outlet; 27. auxiliary liquid outlet; 3. vertical moving component; 31. extension and lowering rod; 32. horizontal moving component; 4. industrial camera; 5. water pump; 6. water tank; 7. hot melt adhesive pump; 8. hot melt adhesive melting box; 9. four-way joint; 10. first valve; 11. second valve; 12. third valve; 13. air pump; 14. transparent soil; 15. transparent rock; 16. simulated concrete column. DETAILED DESCRIPTION

[0036] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0037] like Figure 1-5 As shown, a complex formation high-pressure water jet pile forming simulation test device comprises a transparent model tank 1, in which transparent simulated rock and soil are filled; a high-pressure water jet pile forming device 2 is arranged directly above the transparent model tank 1; the high-pressure water jet pile forming device 2 comprises a drill rod 21 and a liquid supply device, and the top end of the drill rod 21 is connected to the liquid supply device through a pipeline; the drill rod 21 is connected to a vertical moving component 3 for driving the drill rod 21 to move vertically;

[0038] An industrial camera 4 is arranged on the side of the transparent model groove 1 , and the industrial camera 4 is aimed at the transparent simulated rock and soil just below the drill rod 21 .

[0039] A delivery pipe 22 is provided at the center of the drill rod 21. The drill rod 21 includes a fixed pipe 23 and a rotating rod 24 connected by a pipe joint (not shown). The delivery pipe 22 passes through the fixed pipe 23 and the rotating rod 24. The top of the fixed pipe 23 is connected to the vertical moving assembly 3, and a driving assembly (not shown) for driving the rotating rod 24 to rotate is provided on the fixed pipe 23; the top of the delivery pipe 22 is connected to the liquid supply device through a pipeline; a drill bit 25 is provided at the bottom end of the rotating rod 24, and a liquid outlet 26 connected to the delivery pipe 22 is provided at the center of the drill bit 25; the liquid outlet 26 and the delivery pipe 22 are coaxial with the drill rod 21. The pipe joint and the driving assembly are prior art, and the pipe joint and the driving assembly disclosed in the publication number CN113565440B are adopted, so no further description is made.

[0040] The liquid supply equipment includes a water pump 5, a hot melt adhesive pump 7, a water tank 6 and a hot melt adhesive melting tank 8. The input end of the water pump 5 is connected to the water tank 6, the input end of the hot melt adhesive pump 7 is connected to the hot melt adhesive melting tank 8, and the output end of the water pump 5 and the output end of the hot melt adhesive pump 7 are both connected to the delivery pipe 22.

[0041] It also includes an air pump 13. The water pump 5, the hot melt adhesive pump 7 and the air pump 13 are connected to the delivery pipe 22 through a four-way joint 9, and a first valve 10 is arranged between the water pump 5 and the four-way joint 9; a second valve 11 is arranged between the hot melt adhesive pump 7 and the four-way joint 9; and a third valve 12 is arranged between the air pump 13 and the four-way joint 9.

[0042] The drill bit 25 is also provided with a plurality of auxiliary liquid outlet holes 27 connected with the delivery pipe 22 . The plurality of auxiliary liquid outlet holes 27 are all arranged transversely, and the plurality of auxiliary liquid outlet holes 27 are evenly spaced along the circumference of the liquid outlet hole 26 .

[0043] An inclination angle is set between the axial direction of the auxiliary liquid outlet hole 27 and the radial direction of the delivery pipe 22 , and the inclination direction of the auxiliary liquid outlet hole 27 is opposite to the rotation direction of the drill bit 25 .

[0044] The vertical moving assembly 3 includes a telescopic rod 31 group, and a horizontal moving assembly 32 is also arranged at the top of the telescopic rod 31 group, and the drill rod 21 is arranged on the moving block of the horizontal moving assembly 32. The telescopic rod 31 group includes four symmetrically arranged telescopic rods 31, and the tops of the four telescopic rods 31 are connected to two symmetrically arranged longitudinal moving rod groups, and a transverse moving rod group is arranged between the movable blocks of the two longitudinal moving rod groups, and the drill rod 21 is fixedly connected to the moving block of the transverse moving assembly.

[0045] like Figure 6 As shown, a simulation test method for high-pressure water jet pile formation in complex strata includes the following steps:

[0046] S1: Transparent rock 15 is prepared using n-dodecane, No. 15 white oil and silica gel powder; transparent soil 14 is prepared using n-dodecane, No. 15 white oil and fused silica sand; when preparing transparent soil 14, n-dodecane and No. 15 white oil are first mixed, and the refractive index of the mixed liquid is made the same as the refractive index of the fused silica sand, which is 1.4585; then the mixed liquid is mixed with the fused silica sand to prepare transparent soil 14. Bubbles are easily mixed into the transparent soil 14 during preparation, and after the mixed liquid is mixed with the fused silica sand, a vacuum saturator should be used to extract the bubbles in the transparent soil 14.

[0047] S2: Fill transparent rock 15 and transparent soil 14 to simulate real complex strata into the transparent model slot 1 to form transparent simulated rock and soil; before the transparent rock 15 and transparent soil 14 are filled into the transparent model slot 1, clean the transparent model slot 1 and wipe it with a dry towel to prevent dust on the surface of the transparent model slot 1 from affecting the clarity of the image taken by the industrial camera 4.

[0048] S3: Start the driving assembly to rotate the rotating rod 24 and the drill bit 25, and the vertical moving assembly 3 drives the drill rod 21 downward to drill the transparent rock and soil. When the drill bit 25 hits the transparent rock 15, go to step S4, otherwise go to step S5;

[0049] S4: Start the water pump 5 and open the first valve 10, the liquid outlet 26 and the auxiliary liquid outlet 27 spray water to crush the transparent rock 15, and then enter step S5;

[0050] S5: After the drill bit 25 reaches the specified depth, the water pump 5 and the first valve 10 are closed, and the air pump 13 and the third valve 12 are opened; the air pump 13 blows out the remaining water in the pipeline between the four-way connector 9 and the drill bit 25 and the delivery pipe 22;

[0051] S6: close the air pump 13 and the third valve 12, open the hot melt adhesive pump 7 and the second valve 11, and the hot melt adhesive pump 7 pumps the hot melt adhesive in a molten state to the drill bit 25;

[0052] S7: While the molten hot melt adhesive flows out from the liquid outlet 26 and the auxiliary liquid outlet 27, the vertical moving assembly 3 drives the drill rod 21 to move upward, completing the simulated pile pouring operation; the molten hot melt adhesive solidifies to form a simulated concrete column 16;

[0053] S8: The entire process of steps S3-S7 is recorded by the industrial camera 4. The industrial cameras 4 can be respectively arranged around the transparent model slot 1, and the photos taken by the four industrial cameras 4 are recognized and processed and converted into model data, so as to facilitate the reading and analysis of the change data of soil and rock during the hole forming process and the pile pouring process.

Claims

1. A high-pressure water jet pile simulation test device for complex formations, characterized in that: The invention comprises a transparent model tank (1), wherein the transparent model tank (1) is filled with transparent simulated rock and soil; a high-pressure water jet pile forming device (2) is arranged directly above the transparent model tank (1); the high-pressure water jet pile forming device (2) comprises a drill rod (21) and a liquid supply device, wherein the top end of the drill rod (21) is connected to the liquid supply device via a pipeline; the drill rod (21) is connected to a vertical movement component (3) for driving the drill rod (21) to move vertically; Transparent rock is prepared using n-dodecane, No. 15 white oil and silica gel powder; transparent soil is prepared using n-dodecane, No. 15 white oil and fused quartz sand; transparent rock and transparent soil simulate real complex strata and are filled into a transparent model tank (1) to form transparent simulated rock and soil; An industrial camera (4) is arranged on the side of the transparent model groove (1), and the industrial camera (4) is aimed at the transparent simulated rock and soil directly below the drill rod (21); A delivery pipe (22) is arranged at the center of the drill rod (21). The drill rod (21) comprises a fixed pipe (23) and a rotating rod (24) connected by a pipe joint. The delivery pipe (22) penetrates the fixed pipe (23) and the rotating rod (24). The top end of the fixed pipe (23) is connected to the vertical moving assembly (3), and the fixed pipe (23) is provided with a driving assembly for driving the rotating rod (24) to rotate. The top end of the delivery pipe (22) is connected to a liquid supply device through a pipeline. A drill bit (25) is arranged at the bottom end of the rotating rod (24). A liquid outlet (26) communicating with the delivery pipe (22) is arranged at the center of the drill bit (25). The liquid outlet (26) and the delivery pipe (22) are coaxial with the drill rod (21). The liquid supply device comprises a water pump (5), a hot melt adhesive pump (7), a water tank (6) and a hot melt adhesive melting tank (8); the input end of the water pump (5) is connected to the water tank (6), the input end of the hot melt adhesive pump (7) is connected to the hot melt adhesive melting tank (8), and the output end of the water pump (5) and the output end of the hot melt adhesive pump (7) are both connected to the delivery pipe (22).

2. The complex stratum high pressure water jet pile simulation test device according to claim 1 is characterized in that: It also includes an air pump (13), wherein the water pump (5), the hot melt adhesive pump (7) and the air pump (13) are connected to the delivery pipe (22) via a four-way joint (9), and a first valve (10) is arranged between the water pump (5) and the four-way joint (9); a second valve (11) is arranged between the hot melt adhesive pump (7) and the four-way joint (9); and a third valve (12) is arranged between the air pump (13) and the four-way joint (9).

3. The complex stratum high pressure water jet pile forming simulation test device according to claim 2 is characterized in that: The drill bit (25) is also provided with a plurality of auxiliary liquid outlet holes (27) connected to the delivery pipe (22); the plurality of auxiliary liquid outlet holes (27) are all arranged transversely; and the plurality of auxiliary liquid outlet holes (27) are evenly spaced along the circumference of the liquid outlet hole (26).

4. The complex stratum high pressure water jet pile forming simulation test device according to claim 3 is characterized in that: An inclination angle is provided between the axial direction of the auxiliary liquid outlet hole (27) and the radial direction of the delivery pipe (22), and the inclination direction of the auxiliary liquid outlet hole (27) is opposite to the rotation direction of the drill bit (25).

5. The complex stratum high pressure water jet pile forming simulation test device according to claim 4 is characterized in that: The vertical moving assembly (3) comprises a telescopic rod (31) group, the top of which is also provided with a horizontal moving assembly (32), and the drill rod (21) is arranged on a moving block of the horizontal moving assembly (32).

6. A simulation test method using the complex stratum high pressure water jet pile simulation test device according to any one of claims 3 to 5, characterized in that: The steps include: S1: Transparent rock was prepared using n-dodecane, No. 15 white oil and silica gel powder; transparent soil was prepared using n-dodecane, No. 15 white oil and fused quartz sand; S2: Filling transparent rock and transparent soil to simulate real complex strata into the transparent model slot to form transparent simulated rock and soil; S3: Start the driving assembly to rotate the rotating rod and the drill bit, and the vertical moving assembly drives the drill rod downward to drill the transparent rock and soil. When the drill bit hits the transparent rock, go to step S4, otherwise go to step S5; S4: Start the water pump and open the first valve, the liquid outlet and the auxiliary liquid outlet will spray water to break the transparent rock, and then go to step S5; S5: After the drill bit reaches the specified depth, the water pump and the first valve are closed, and the air pump and the third valve are opened; the air pump blows out the remaining water in the pipeline between the four-way joint and the drill bit and the delivery pipe; S6: close the air pump and the third valve, open the hot melt adhesive pump and the second valve, and the hot melt adhesive pump pumps the molten hot melt adhesive to the drill bit; S7: While the molten hot melt adhesive flows out from the outlet hole and the auxiliary outlet hole, the vertical moving assembly drives the drill rod to move upward to complete the simulated pile pouring operation; S8: Wait for the translucent hot melt adhesive in the molten state to solidify. The solidified hot melt adhesive is light yellow. Use an industrial camera to shoot the solidification process of the hot melt adhesive, as well as the drilling operation and simulated pile pouring operation process.

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