Soil drilling and clearing device and method for geotechnical model test

Abstract

The present invention discloses a soil drilling and clearing device and method for geotechnical model test. The cleaning device is composed of two groups of symmetrically arranged collecting plates, which are rotatable. One end of the two groups of collecting plates is rotatably connected by a rotating shaft. Baffles are provided on both sides of the collecting plates to form a bearing cavity for the soil. A cavity structure is provided on the back of the collecting plate. A motor and a drill bit are fixed in the cavity structure on the back of the collecting plate. The drill bit is fixed to the end of the motor. The drill bit is located at the end of the collecting plate to form an excavation structure that can drill automatically. One end of the two groups of collecting plates is rotatably connected by a rotating shaft. At the same time, a lifting device is cooperated. After the drilling device drills into the soil using gravity, the lifting device is used to rotate the two groups of collecting plates, thereby achieving the purpose of collecting and carrying the filling soil, and then lifting it to the air, and then using different lifting ropes on the lifting device to control the opening and closing of the cleaning device. The method is simple and fast, and there is no need to repeatedly dump the collected soil, which greatly improves the collection and cleaning efficiency.

Description

Technical Field

[0001] The invention relates to the field of engineering model test devices, and in particular to a soil drilling and clearing device and method for geotechnical model tests. Background Art

[0002] In recent years, with the acceleration of my country's modernization, infrastructure development, including highways and high-speed railways, has been rapidly developed, along with bridge construction. Pile foundations, due to their high bearing capacity, minimal settlement, and excellent seismic performance, are widely used in bridge foundation engineering. However, frequent seismic damage to bridge pile foundations in China, such as subsidence, liquefaction, scour, and siltation, poses a threat to the overall safety of bridge structures. Optimizing the design of pile foundations to ensure the stability of bridge structures is an urgent engineering challenge that needs to be addressed.

[0003] Conducting geotechnical model tests to test the seismic performance of pile foundations is a very practical and economical solution. During the test, it is generally necessary to fill or remove the soil around the pile to simulate the dynamic response of the pile foundation at different fill heights. However, due to the presence of the pile foundation in the model box, when soil removal is required after a test, in order to ensure the integrity of the pile foundation and the continuity of the test, the model box cannot be tilted or turned over to remove the soil. Commonly used tools cannot meet these requirements, and manual entry into the model box is often required to remove the soil bit by bit. This process is cumbersome, inefficient, and consumes a lot of time and effort. Summary of the Invention

[0004] The purpose of the present invention is to provide a soil drilling and clearing device and method for geotechnical model testing, so as to overcome the problem of low efficiency of traditional manual earthwork clearing methods in the prior art.

[0005] A soil drilling and clearing device for geotechnical model test, comprising a cleaning device, a drilling device and a lifting device;

[0006] The cleaning device includes two sets of symmetrically arranged collecting plates, one end of the two sets of collecting plates are rotatably connected by a rotating shaft, and baffles are provided on both sides of the collecting plates;

[0007] The drilling device includes a motor and a drill bit. The back of the collecting plate is a cavity structure. The motor is fixed in the cavity structure on the back of the collecting plate. The drill bit is fixed to the end of the motor. The drill bit is located at the end of the collecting plate.

[0008] The lifting device includes a first lifting rope, a second lifting rope and a lifting power device. The first lifting rope and the second lifting rope are both arranged on the lifting power device. One end of the first lifting rope is fixed to one end of the two sets of collecting plates connected by a rotating shaft, and the other end of the two sets of collecting plates is fixed with a second lifting rope.

[0009] Preferably, the baffle at one end where the two sets of collecting plates are connected by the rotating shaft is provided with an inclined surface.

[0010] Preferably, the collecting plate includes an upper collecting plate structure and a lower collecting plate structure, and one end of the upper collecting plate structure is connected to one end of the lower collecting plate structure via a rotating pin.

[0011] Preferably, when the baffle end faces at one end of the upper collecting plate structure and the lower collecting plate structure are in contact with each other, the angle between the planes where the back surfaces of the upper collecting plate structure and the lower collecting plate structure are located is greater than zero degrees.

[0012] Preferably, a lifting ring for connecting a lifting device is provided on the baffle on the collecting plate.

[0013] Preferably, the wires for connecting the motor to the power supply are buried along the back side of the collecting plate.

[0014] Preferably, a plurality of motors are provided at the end of the drilling device.

[0015] Preferably, an electromagnetic suction structure is provided on the back side of the collecting plate.

[0016] Preferably, the lifting device further comprises a gantry support, a movable crossbeam is provided on the gantry support, and the winding and hoisting power device is movably provided on the movable crossbeam.

[0017] A method for drilling and removing soil in a geotechnical model test comprises the following steps:

[0018] S1: By adjusting the position of the moving crossbeam and the lifting power device, the drilling and clearing device is positioned directly above the fill to be cleared;

[0019] S2, making the back of the collecting plate of the drilling device fit, controlling the drilling device to drill into the soil through the lifting device, and keeping the drilling and clearing device vertically downward during the drilling process;

[0020] S3: After the drilling and cleaning device drills to the specified depth, the second lifting rope connected to the two ends of the collecting plate is tightened. When the two sets of collecting plates are fully opened, the second lifting rope is used to pull the drilling and cleaning device out of the geotechnical model test box of the fill to be cleaned. The first lifting rope is tightened and the second lifting rope is loosened at the same time. The excavated fill is unloaded on the open ground to complete the cleaning process. Repeat the above steps until the fill to be cleaned is cleared.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The present invention discloses a soil drilling and clearing device for geotechnical model test. The cleaning device is composed of two groups of symmetrically arranged collecting plates, which are rotatable. One end of the two groups of collecting plates is rotatably connected by a rotating shaft. Baffles are provided on both sides of the collecting plates to form a bearing cavity for the soil. A cavity structure is provided on the back of the collecting plate. A motor and a drill bit are fixed in the cavity structure on the back of the collecting plate. The drill bit is fixed to the end of the motor. The drill bit is located at the end of the collecting plate to form an excavation structure that can drill automatically. One end of the two groups of collecting plates is rotatably connected by a rotating shaft. At the same time, a lifting device is cooperated. After the drilling device drills into the soil using gravity, the lifting device is used to rotate the two groups of collecting plates, thereby achieving the purpose of collecting and carrying the filling soil, and then lifting it to the air. Different lifting ropes on the lifting device are used to control the opening and closing of the cleaning device, so as to achieve one-time collection and one-time pouring. It is simple and quick, and there is no need to repeatedly dump the collected soil, which greatly improves the collection and cleaning efficiency.

[0023] The present invention can not only remove the fill layer of a specified height, but also remove the entire fill body without damaging the pile foundation model, and has high economic and practical value.

[0024] The invention has a wide range of applications and is not only suitable for removing fill soil in geotechnical model tests of pile foundations, but also suitable for removing fill soil in geotechnical model tests of slopes, foundations, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the closed state of the drilling and clearing device in an embodiment of the present invention.

[0026] Figure 2 Schematic diagram of the drilling and clearing device in the embodiment of the present invention in the open state.

[0027] Figure 3 Schematic diagram of the upper collecting plate structure in an embodiment of the present invention.

[0028] Figure 4 Schematic diagram of the lower collecting plate structure in an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure in which two upper collecting plates are connected via a rotating shaft in an embodiment of the present invention.

[0030] Figure 6 Schematic diagram of the connection structure between the upper collecting plate structure and the lower collecting plate structure in an embodiment of the present invention.

[0031] Figure 7 Schematic diagram of a drilling device in an embodiment of the present invention.

[0032] Figure 8 Schematic diagram of the structure of the pulling device in an embodiment of the present invention.

[0033] Figure 9This is a schematic diagram of the installation structure of the pulling device in an embodiment of the present invention.

[0034] Figure 10 Schematic diagram of the pile foundation geotechnical test model box structure in an embodiment of the present invention.

[0035] Figure 11 This is a schematic diagram before the overall single excavation operation in an embodiment of the present invention.

[0036] Figure 12 This is a schematic diagram of an overall single excavation operation in an embodiment of the present invention.

[0037] Figure 13 This is a schematic diagram of an overall single excavation operation in an embodiment of the present invention.

[0038] Figure 14 This is a schematic diagram of the installation structure of the collection device in an embodiment of the present invention.

[0039] In the figure: 1-cleaning device; 2-drilling device; 3-lifting device; 4-rotating shaft; 5-baffle; 6-rotating pin; 7-collecting plate; 8-motor; 9-drill bit; 10-first lifting rope; 11-second lifting rope; 12-lifting power device; 13-upper collecting plate structure; 14-lower collecting plate structure; 15-lifting ring; 16-conducting wire; 17-reeling rope; 18-hook; 19-gantry bracket; 20-movable crossbeam; 21-geotechnical model test box; 22-fill body; 23-cap; 24-concrete model pile. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] like Figure 1 、 Figure 9 As shown, the present invention is a soil drilling and clearing device for geotechnical model tests, which specifically includes a cleaning device 1, a drilling device 2 and a lifting device 3; the drilling device 2 provides power for the cleaning device 1 to drill into the soil, and by controlling the excavation rate and depth of the drilling device 2, after drilling to a specified depth, the drilling device 2 and the backfill cleared by the cleaning device 1 are lifted from the soil by the lifting device 3, and then the backfill in the cleaning device 1 is poured out, and drilling is carried out again to the specified depth for cleaning, and the reciprocating cycle is repeated until the backfill is cleared; the above-mentioned specific structure is described in detail in conjunction with the accompanying drawings:

[0042] like Figure 1 As shown, Figure 14 As shown, the cleaning device 1 includes two groups of symmetrically arranged collecting plates 7, one end of the two groups of collecting plates 7 are rotatably connected by a rotating shaft 4, the two groups of collecting plates 7 have the same structure, baffles 5 are provided on both sides of the collecting plates 7, and the baffle 5 at one end of the two groups of collecting plates 7 connected by the rotating shaft 4 is provided with an inclined surface so that the two groups of collecting plates 7 connected by the rotating shaft 4 can rotate relative to each other during the collection process, and the inclined surfaces of the baffles 5 on both sides of the collecting plates 7 are in contact to achieve limiting. When the two groups of collecting plates 7 are rotated to the inclined surface limit, the angle between the two groups of collecting plates is greater than 0 degrees; the back sides of the two groups of collecting plates 7 can fit together.

[0043] like Figure 7 As shown, the drilling device 2 includes a motor 8 and a drill bit 9. The back of the collecting plate 7 is a cavity structure. The motor 8 is fixed in the cavity structure on the back of the collecting plate 7. The drill bit 9 is fixed to the end of the motor 8, and the drill bit 9 is located at the end of the collecting plate 7. In the initial state of drilling into the soil, the backs of the two groups of collecting plates 7 are fitted together, and the drill bit 9 at the end of the collecting plate 7 provides power. Under the action of gravity, the two groups of collecting plates 7 are provided with one end of the drill bit 9 facing downward and enter the soil first, and the drill bit is used to drive the entire device to complete the process of entering the soil.

[0044] like Figure 2 、 Figure 4 and Figure 11 As shown, the lifting device 3 includes a first lifting rope 10, a second lifting rope 11 and a lifting power device 12 for providing lifting power. One end of the first lifting rope 10 is fixed to one end of the two groups of collecting plates connected by the rotating shaft 4, and the other end of the two groups of collecting plates 7 is fixed with a second lifting rope 11. The first lifting rope 10 and the two second lifting ropes 11 are powered by the lifting power device 12 to achieve the lifting and pulling function. During drilling, the two second lifting ropes 11 are in a relaxed state, and the backs of the two groups of collecting plates 7 are fitted together and in a closed state. The first lifting rope 10 is used to lift the two groups of collecting plates, and the drilling device 2 is directed downward to the fill to be cleared, and the drilling device 2 is controlled to drill into the soil. During the drilling process, the first lifting rope 10 is used to control the balance of the drilling device to keep the drilling and clearing device vertically downward. Figure 13 As shown, after drilling to the specified depth, tighten the second lifting rope 11 fixed to the other end of the two sets of collecting plates 7, and the two sets of collecting plates 7 rotate relative to each other with the rotating shaft 4 as the rotation center, and the backfill is loaded into the filling cavity formed by the collecting plate 7 and the baffles 5 on both sides thereof, and finally the backfill is pulled out in mid-air. When the soil needs to be poured out, pull the first lifting rope 10 and loosen the two second lifting ropes 11, and the backfill can be poured out from the cleaning device 1, and the above steps are repeated; during use, the two second lifting ropes 11 can be used to cooperate with the first lifting rope 10 to control the opening and closing angles of the two sets of collecting plates 7 to achieve backfill cleaning at different depths; the presence of the baffles on both sides can make the cleared backfill less likely to fall.

[0045] Example 1

[0046] The two sets of symmetrically arranged collecting plates 7 have the same structure. This application adopts two hinged collecting plate structures as a set of collecting plates. Figure 1 、 Figure 2 As shown, one group of collecting plates 7 includes an upper collecting plate structure 13 and a lower collecting plate structure 14, and one end of the upper collecting plate structure 13 is connected to one end of the lower collecting plate structure 14 by a rotating pin 6; when the baffles at one end of the upper collecting plate structure 13 and the lower collecting plate structure 14 are rotated and connected to fit together, the two form an angle, and baffles are set on both sides of the upper ends of the upper collecting plate structure 13 and the lower collecting plate structure 14 to form a trough structure; the ends of the upper collecting plate structures 13 in the two groups of collecting plates 7 are hinged, and the hinged ends of the two upper collecting plate structures 13 are flush.

[0047] A lifting ring 15 is provided on the baffle plate on the collecting plate 7 for connecting the lifting rope of the pulling device 3.

[0048] For a collecting plate with a single collecting plate structure, a lifting ring 15 is provided at both ends of the baffle of the collecting plate. The lifting ring at one end of the rotational connection between the two sets of collecting plates is used to connect the first lifting rope 10, and the first lifting rope 10 is used to lift from the middle of the two sets of collecting plates for guiding when drilling or lifting when pouring out the backfill; the lifting ring at the far end of the two sets of collecting plates is used to connect the second lifting rope 11. When drilling into the soil and taking the soil is completed, the second lifting ropes 11 at both ends are used to lift to achieve the purpose of cleaning the backfill.

[0049] The wire 16 used to connect the motor 8 in the drilling device 2 is buried along the back of the collecting plate 7; according to the specifications of the drilling device 2, multiple motors 8 can be set at the end of the drilling device 2 to drive multiple drill bits for drilling to improve work efficiency; the drill bit is used to dig in the fill, and the drill bit must always be kept vertically downward during the digging process.

[0050] An electromagnetic suction structure is provided on the back of the collecting plate 7. When drilling is required, the electromagnetic suction structure is used to suck the two groups of collecting plates 7 together. The backs of the two groups of collecting plates 7 remain in contact during the drilling process to ensure that they can drill into the set depth, avoiding the two groups of collecting plates 7 from being separated by the fill, and ensuring the stability of the entire device during the drilling process.

[0051] According to the different number of collecting plates 7, multiple lifting power devices 12 can be set. This application describes the structure of two hinged collecting plates as a group of collecting plates, such as Figures 8 to 14As shown, the lifting power device 12 adopts a winch, a rope 17 is provided on the rotating shaft of the winch, a hook 18 is provided at the end of the rope 17, and the hook 18 is connected to the collecting plate 7 through a lifting rope; specifically, three winches are used, and the first lifting rope 10 and the second lifting rope 11 are used to maintain the balance of the drilling and clearing device, and to pull it up after digging to a certain depth in the backfill of the drilling and clearing device to dig out the backfill.

[0052] At the same time, for the cleaning of fill at different positions, a gantry bracket 19 is set, a movable beam 20 is set on the gantry bracket 19, and a winch is installed on the movable beam 20 and can move on the movable beam 20. The left and right winches are used to stretch the drilling and clearing device from a closed state to an open state during the pulling process; the middle one is mainly used to maintain the drilling and clearing device to ensure its vertical drilling, and also plays a certain auxiliary role in the pulling process.

[0053] The gantry support 19 has the function of supporting the structure. The moving beam 20 can move on the gantry support 19, and the winch can move on the moving beam 20. The gantry support 19 is used to bear the load.

[0054] like Figure 10 As shown, a geotechnical model test box 21 used in the fields of mechanics and civil engineering is provided with a backfill 22, a foundation 23 and concrete model piles 24 in the geotechnical model test box: the backfill 22 is used to simulate the soil set in the geotechnical model test box 21 under various working conditions; the foundation 23 is used to connect the piles together to form a pile foundation; the concrete model piles 24 are pile models that are reduced in size according to the actual proportion based on the geotechnical test similarity ratio.

[0055] In the embodiment of the present invention, the process of drilling and removing soil from a geotechnical model test using the above-mentioned geotechnical model test soil drilling and removal device is performed, taking the two hinged collection plate structures in Example 1 as a set of collection plate structures as an example, and specifically includes the following steps:

[0056] S1: By adjusting the position of the moving beam 20 and the lifting power device 12 on the moving beam 20, the drilling and clearing device is located directly above the fill body to be cleared, such as Figure 11 ;

[0057] S2, ensure that the back of the collecting plate 7 of the drilling device 2 is in contact, that is, the drilling device 2 is in a closed state, such as Figure 1 As shown, the drilling device 2 is controlled by the lifting device 3 to drill into the soil. During the drilling process, the first lifting rope 10 is controlled by the lifting power device 12 in the middle to control the balance and keep the drilling and clearing device vertically downward, as shown in FIG. Figure 12 ;

[0058] S3: After the drilling and clearing device drills to the specified depth, the second lifting ropes 11 connected to both ends of the collecting plates are moved to both sides and tightened. When the two sets of collecting plates are fully opened, the upper collecting plate structure 13 and the lower collecting plate structure 14 rotate to make contact with the end faces of the baffles connected at one end; at the same time, the first lifting rope 10 is tightened to assist in balancing; and finally the fill soil is pulled into the air; Figure 13 At this time, the drilling and clearing device reaches the open state, such as Figure 2 .

[0059] The excavated filling soil is unloaded onto the open ground by controlling the lifting device 3. At this time, the drilling and clearing device returns to the closed state, and the above steps are repeated until the filling soil to be cleared is cleared.

[0060] The present invention can not only remove the fill layer of a specified height, but also remove the entire fill body without damaging the pile foundation model, and has high economic and practical value.

[0061] The invention has a wide range of applications and is not only suitable for removing fill soil in geotechnical model tests of pile foundations, but also suitable for removing fill soil in geotechnical model tests of slopes, foundations, etc.

Claims

1. A soil drilling and clearing device for geotechnical model testing, characterized in that: It comprises a cleaning device (1), a drilling device (2) and a pulling device (3); The cleaning device (1) comprises two sets of symmetrically arranged collecting plates (7), one end of the two sets of collecting plates (7) being rotatably connected via a rotating shaft (4), and baffles (5) are provided on both sides of the collecting plates (7); The drilling device (2) comprises a motor (8) and a drill bit (9); the back of the collecting plate (7) is a cavity structure; the motor (8) is fixed in the cavity structure on the back of the collecting plate (7); the drill bit (9) is fixed to the end of the motor (8); and the drill bit (9) is located at the end of the collecting plate (7); The lifting device (3) comprises a first lifting rope (10), a second lifting rope (11) and a lifting power device (12). The first lifting rope (10) and the second lifting rope (11) are both arranged on the lifting power device (12). One end of the first lifting rope (10) is fixed to one end of the two groups of collecting plates connected by a rotating shaft (4). The other end of the two groups of collecting plates (7) is fixed with a second lifting rope (11). The baffle (5) at one end of the two groups of collecting plates (7) connected by the rotating shaft (4) is provided with an inclined surface. The collecting plate (7) comprises an upper collecting plate structure (13) and a lower collecting plate structure (14). One end of the upper collecting plate structure (13) is connected to one end of the lower collecting plate structure (14) by a rotating pin (6).

2. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: When the baffle end faces of the upper collecting plate structure (13) and the lower collecting plate structure (14) are rotatably connected at one end and contact each other, the angle between the planes where the back surfaces of the upper collecting plate structure (13) and the lower collecting plate structure (14) are located is greater than zero degrees.

3. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: A lifting ring (15) for connecting to the lifting device (3) is provided on the baffle plate on the collecting plate (7).

4. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: The electric motor (8) is used to connect the electric power supply with a lead (16) which is buried along the back surface of the collecting plate (7).

5. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: A plurality of motors (8) are provided at the end of the drilling device (2).

6. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: An electromagnetic suction structure is provided on the back of the collecting plate (7).

7. The soil drilling and clearing device for geotechnical model testing according to claim 1, characterized in that: The lifting device (3) further comprises a gantry support (19), a movable crossbeam (20) is arranged on the gantry support (19), and the hoisting power device (12) is movably arranged on the movable crossbeam (20).

8. A method for removing soil from a geotechnical model test by drilling based on the device for removing soil from a geotechnical model test according to claim 7, characterized in that: The following steps are involved: S1: by adjusting the positions of the movable crossbeam (20) and the lifting power device (12), the drilling and clearing device is positioned directly above the fill body to be cleared; S2, making the back of the collecting plate (7) of the drilling device (2) fit, controlling the drilling device (2) to drill into the soil through the lifting device (3), and keeping the drilling and clearing device vertically downward during the drilling process; S3: After the drilling and clearing device drills to the specified depth, the second lifting rope (11) connected to the two ends of the collecting plate is tightened. When the two sets of collecting plates are fully opened, the drilling and clearing device is pulled out of the geotechnical model test box of the fill to be cleared by using the second lifting rope (11). The first lifting rope (10) is tightened and the second lifting rope (11) is loosened at the same time. The excavated fill is unloaded on the open ground. This completes a cleaning process. The above steps are repeated until the fill to be cleared is cleared.

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