Deep soil relative compactness in-situ sampling device and working method

Abstract

The invention discloses a deep soil relative compactness in-situ sampling device and a working method.The deep soil relative compactness in-situ sampling device comprises a movable base, a sampling channel is formed in the movable base, a truss is arranged on the movable base around the sampling channel, and a cross beam capable of moving up and down along the truss is arranged at the top of the truss; an electric cylinder for driving the cross beam to move up and down is mounted below the cross beam, a protective cylinder is mounted below the electric cylinder, a motor is mounted on the cross beam and connected with a drill rod or a sampler, and a controller connected with the electric cylinder and the motor is further arranged on the movable base. During working, the controller, the electric cylinder and the motor act, the electric cylinder presses the pile casing into a soil body, the motor drives the drill rod to drill, and after drilling is completed, sampling is conducted through the sampler. Through cooperation of the pile casing and the electric cylinder, the hole forming stability is improved, disturbance of drilling to surrounding soil is avoided, and the measurement precision of the relative compactness of the deep soil is effectively improved.

Description

Technical Field

[0001] The invention relates to soil density test sampling, and in particular to an in-situ sampling device for relative density of deep soil and a working method. Background Art

[0002] During the process of soil deposition under natural conditions, there are significant differences in the relative density of soil samples at different depths, and the relative density of soil is closely related to the bearing capacity of the foundation. Usually, for the determination of the relative density of soil at a certain depth, the main method is to use a core drill to drill holes for sampling, but this sampling method is easy to disturb the soil sample, affecting the accuracy of the measurement results, and the sampling efficiency is low, especially deep soil sampling is more difficult.

[0003] There are two main problems with deep soil sampling, namely drilling and sampling. If a core drill is used for drilling and sampling, the soil sample is easily disturbed during the drilling process, resulting in inaccurate measurement of the relative density of the soil, and there are problems such as low sampling efficiency and hole collapse; if the existing sampler is used for sampling, the sampling depth is small, and deep soil sampling cannot be carried out. In fact, the key to deep soil sampling is how to solve the hole formation problem and the long-distance sampling problem. After consulting the information, the existing drilling technology is relatively mature, and there are many types of drilling machines, such as crawler drills, rotary drills, screw drills, etc., but the above-mentioned machines have problems such as disturbing the surrounding soil and unstable hole formation during the drilling process. Conventional samplers can achieve low-disturbance soil sampling, but the sampling rod is short and cannot remove the soil samples disturbed by drilling. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide an in-situ sampling device and working method for relative density of deep soil to solve the problems existing in the above-mentioned prior art.

[0005] Technical solution: Some embodiments of the present disclosure propose an in-situ sampling device for the relative density of deep soil, which includes a movable base, a sampling channel is arranged on the movable base, a truss is arranged around the sampling channel, a crossbeam that can move up and down along the truss is arranged on the top of the truss, an electric cylinder for driving the crossbeam to move up and down is installed under the crossbeam, a casing is installed under the electric cylinder, a motor is installed on the crossbeam, the motor is connected to a drill rod or a sampler, and a controller connected to the electric cylinder and the motor is also arranged on the movable base.

[0006] Optionally, the movable base includes a main body, and a hydraulic support and traveling wheels are arranged below the main body, and the height of the hydraulic support is controlled by a controller.

[0007] Optionally, a counterweight and a level bubble are also provided on the movable base.

[0008] Optionally, the steel truss is provided with a guide groove, and the crossbeam is installed in the guide groove and slides up and down along the guide groove.

[0009] Optionally, the sampler includes a connecting rod and a soil sampling box which are connected to each other, the connecting rod is connected to a motor, and the soil sampling box includes an upper box, a middle box and a lower box, and the upper box, the middle box and the lower box are detachably connected.

[0010] Optionally, the electric cylinder and the motor are fixed to the crossbeam using high-strength bolts.

[0011] Optionally, the casing, drill rod and sampler are all length-adjustable structures.

[0012] The embodiment of the present disclosure also provides a working method of a deep soil relative density in-situ sampling device, the working method comprising the following steps:

[0013] The controller controls the movable base to move to a specified position;

[0014] The controller controls the action of the electric cylinder, which presses the casing into the soil;

[0015] The controller controls the motor to move, and the motor drives the drill rod to rotate to screw out the soil in the casing, and then remove the drill rod to install the sampler;

[0016] The motor drives the sampler to the specified depth, and the electric cylinder drives the sampler to descend for sampling until the sampler is filled with soil.

[0017] Optionally, it also includes: a controller controlling the movable base to level.

[0018] Beneficial effects:

[0019] The embodiments of the present disclosure can realize deep soil drilling and mechanized sampling, thereby improving sampling efficiency and sampling accuracy. Through the cooperation of casing and electric cylinder, the stability of hole formation is improved, the disturbance of surrounding soil by drilling is avoided, and the measurement accuracy of relative density of deep soil is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the sampling device;

[0021] Figure 2 It is a schematic diagram of the drilling process;

[0022] Figure 3 This is a schematic diagram of the completion of drilling;

[0023] Figure 4 It is a schematic diagram of the device for installing the sampler;

[0024] Figure 5 It is a schematic diagram of the sampling process;

[0025] Figure 6 It is a schematic diagram of sampling completion;

[0026] Figure 7 This is a schematic diagram of the soil sample prepared for measurement. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific examples.

[0028] like Figure 1 As shown, the in-situ sampling device for relative density of deep soil includes a controller 1, a casing 6, a drill rod 7, a conductor 8, a base 9, a hydraulic support 10, a traveling wheel 11, a counterweight 12, a level bubble 14 and a sampler 15.

[0029] A sampling channel is provided on the base 9, and a truss 5 is installed around the sampling channel on the base 9. A crossbeam 3 is set on the top of the truss. The crossbeam and the truss 5 are both made of steel material. The truss is provided with a guide groove, and the crossbeam is installed in the guide groove and slides up and down along the guide groove. The crossbeam 3 is connected to the truss through a gear or a steel cable. An electric cylinder 4 is installed under the crossbeam, and a casing is installed under the electric cylinder 4. A motor 2 is installed on the crossbeam, and the motor 2 is connected to the drill rod 7 or the sampler 15. The drill rod is installed under the motor 2 and on the inner side of the casing. The sampler 15 and the drill rod cannot be installed on the motor at the same time. The sampler 15 is composed of a connecting rod 1501, an upper box 1502, a middle box 1503 and a lower box 1504. The upper box, the middle box and the lower box are detachable structures connected by pins or bolts. The connecting rod and the spiral drill rod of the sampler are both designed with variable length. The controller 1 is mounted on the base 9, the counterweight 12 and the level bubble 14 are mounted on the base 9, the traveling wheels 11 and the hydraulic support 10 are mounted below the base, the traveling wheels include two types: a steerable wheel and a fixed wheel, and the guide wheel has a self-locking function.

[0030] The controller is connected to the motor 2 through the wire 801, and is connected to the electric cylinder 4 through the wire 802, and controls the motor 2 and the electric cylinder 4. The motor drives the drill rod and the sampler to move. The controller 1 is also connected to the hydraulic support 10 through the oil pipe 13 to control the height adjustment of the hydraulic support 10.

[0031] The installation process of the sampling device is as follows: first, the truss 5 is installed on the base 9, the hydraulic support 10 and the traveling wheel 11 are installed on the base 9, the crossbeam 3 is installed on the truss 5, and the motor 2 and the electric cylinder 4 are installed on the upper and lower sides of the steel beam 3 respectively; the controller 1 is installed on the base 9, and is connected to the motor 2 and the electric cylinder 4 with wires 801 and 802 respectively, and the oil pipe 13 is connected to the hydraulic support 10; the level bubble 14 is fixed on the base 9; thereafter, the drill rod 7 is installed under the motor 2, and the casing 6 is fixed under the electric cylinder 4; after the drilling is completed, the drill rod 7 is removed, and the sampler 15 is installed under the motor 2, wherein the assembly process of the sampler 15 is to first assemble the upper box 1502, the middle box 1503 and the lower box 1504, and then install the connecting rod 1501.

[0032] In this embodiment, the spiral drill rod and steel casing 6 are designed to effectively improve the drilling efficiency, greatly reduce the disturbance of the drilling to the surrounding soil, and significantly improve the stability of the hole. The length of the steel casing 6, the spiral drill rod 7, and the sampler 15 can be adjusted to meet the sampling requirements of soil at different depths, and the detachable design of the upper box, the middle box, and the lower box effectively solves the problem of removing the disturbed soil samples at the bottom of the drilling and the disturbed soil samples at the bottom of the sampler. The design of the traveling wheel 11 facilitates the movement of the device when taking soil samples at different positions. The design of the hydraulic support and the level bubble facilitates the adjustment of the horizontality of the device and ensures the verticality of the borehole. At the same time, the design of the counterweight block 12 provides a guarantee for the overall stability of the device when it is in working state.

[0033] When the sampling device of this embodiment is used for sampling and testing, the working process is as follows:

[0034] The device is moved to the position where sampling is to be carried out by the traveling wheel 11, and the device is leveled with the help of the hydraulic support 10, and the traveling wheel 11 is suspended. Then, the casing 6 is pressed into the soil 16 by the electric cylinder 4, and then the motor switch is turned on to use the auger rod 7 to screw out the soil in the steel casing 6. The electric cylinder 4 can also press the casing 6 into the soil and turn on the motor 2 switch to drill the hole with the auger rod 7. When the drilling depth reaches the predetermined depth, the casing 6 is pressed in and the auger rod 7 is stopped, and the auger rod 7 is lifted. Thereafter, the auger rod 7 is removed, and the sampler 15 is installed under the motor 2, and the sampler 15 is lowered to the predetermined position. When sampling, the sampler 15 is slowly lowered by the electric cylinder 4 until the upper box 1502, the middle box 1503 and the lower box 1504 of the sampler 15 are all filled with soil 16 and stop sinking. Finally, lift the sampler 15, remove the upper box 1502 and the lower box 1504, use a scraper to flatten the soil 16 at both ends of the middle box 1503, and dry the soil 16 in the middle box 1503 to obtain the sampled soil.

[0035] The relative density of the sampled soil can be calculated based on the dry density of the sampled soil. The specific calculation formula is as follows:

[0036]

[0037]

[0038] Where: D r is the relative density, ρ max is the maximum dry density of the soil sample, ρ min is the minimum dry density of the soil sample, ρ d is the dry density of the soil sample, m d is the dry weight of the soil sample in the middle box 1503, and V is the volume of the middle box 1503.

[0039] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. An in-situ sampling device for relative density of deep soil, characterized in that: The invention comprises a movable base (9), wherein a sampling channel is arranged on the movable base (9), a truss (5) is arranged around the sampling channel, a crossbeam (3) which can move up and down along the truss is arranged on the top of the truss (5), an electric cylinder (4) which drives the crossbeam to move up and down is installed below the crossbeam (3), a casing (6) is installed below the electric cylinder (4), a motor (2) is installed on the crossbeam, and the motor (2) is connected to a drill pipe (7) or a sampler (15), and a controller (1) which is connected to the electric cylinder (4) and the motor (2) is also arranged on the movable base (9).

2. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The movable base (9) comprises a main body, and a hydraulic support (10) and a traveling wheel (11) are arranged below the main body. The height of the hydraulic support (10) is controlled by a controller (1).

3. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The movable base (9) is also provided with a counterweight (12) and a level bubble (14).

4. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The truss (5) is provided with a guide groove, and the crossbeam (3) is installed in the guide groove and slides up and down along the guide groove.

5. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The sampler (15) comprises a connecting rod (1501) and a soil sampling box which are connected to each other, wherein the connecting rod (1501) is connected to a motor, and the soil sampling box comprises an upper box (1502), a middle box (1503) and a lower box (1504), wherein the upper box (1502), the middle box (1503) and the lower box (1504) are detachably connected.

6. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The electric cylinder (4) and the motor (2) are fixed to the crossbeam (3) using high-strength bolts.

7. The deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The casing (6), the drill rod (7) and the sampler (15) are all length-adjustable structures.

8. The working method of the deep soil relative density in-situ sampling device according to claim 1 is characterized in that: The following steps are involved: The controller controls the movable base to move to a specified position; The controller controls the action of the electric cylinder, which presses the casing into the soil; The controller controls the motor to move, and the motor drives the drill rod to rotate to screw out the soil in the casing, and then remove the drill rod to install the sampler; The motor drives the sampler to the specified depth, and the electric cylinder drives the sampler to descend for sampling until the sampler is filled with soil.

9. The working method of the deep soil relative density in-situ sampling device according to claim 8 is characterized in that: Also includes: The controller controls the movable base to level.

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