CN112697497A

CN112697497A - Loop bar type in-situ lateral soil sampling device

Info

Publication number: CN112697497A
Application number: CN202011400403.7A
Authority: CN
Inventors: 周霜林; 李铮; 肖军; 张明金
Original assignee: Zunyi Normal University
Current assignee: Zunyi Normal University
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-04-23

Abstract

The invention discloses a loop bar type in-situ lateral soil sampling device which comprises a sleeve sleeved on a drill rod during drilling, wherein the sleeve comprises an inner sleeve and an outer sleeve which are concentrically arranged, the inner sleeve is sleeved on the drill rod, an annular air bag is arranged between the outer wall of the inner sleeve and the outer sleeve and provided with an air nozzle, a plurality of first through holes are formed in the wall of the outer sleeve, a sampler is arranged in each first through hole and is T-shaped, the front end of the sampler penetrates through the first through holes and extends out of the outer sleeve, and a sampling port is formed in the front end of the sampler. Compared with the prior art, the invention is used in cooperation with the dynamic sounding, and has simple and reliable structure, convenient application and low cost; taking out a soil sample in the hole, and visually identifying the category of the soil; with the increase of the number of the samplers, thin soil and lenticle soil samples in the geological environment are not easy to be omitted; the accuracy of dividing the soil layer interface is greatly improved.

Description

Loop bar type in-situ lateral soil sampling device

Technical Field

The invention relates to the technical field of geotechnical engineering, in particular to a loop bar type in-situ lateral soil sampling device.

Background

The dynamic penetration test has low cost, high drilling speed and simple and reliable operation, and is widely applied in the field of geotechnical engineering investigation. The working principle of the method is that the soil layer type and the interface are judged according to the hammering number of a certain drilling depth (such as 10cm or 30 cm). However, this determination method inevitably has several main problems:

1. because the 'advance-lag' effect occurs on the soil layer interface, the soil layer interface division may be inaccurate;

2. because dynamic sounding does not take soil samples, soil layer type judgment may be wrong;

3. thin layers of soil and lenticles in geological environments may be missed.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provide a loop bar type in-situ lateral soil sampling device which can perform lateral intensive sampling along the depth direction of a hole wall so as to visually observe a soil sample and solve the problems of wrong soil discrimination, inaccurate soil layer boundary, omission of thin soil layers and lenticles and the like in conventional dynamic penetration.

In order to achieve the purpose, the invention is implemented according to the following technical scheme:

the utility model provides a loop bar formula normal position side direction device of fetching earth, is including being used for the sleeve on the drilling rod is arranged in to the cover when drilling, and the sleeve is including concentric inner skleeve and the outer sleeve that sets up, and the inner skleeve is used for the cover to put on the drilling rod, be equipped with cyclic annular gasbag between the outer wall of inner skleeve and the outer sleeve, cyclic annular gasbag is equipped with the air cock, a plurality of first through-holes have been seted up on the section of thick bamboo wall of outer sleeve, every be equipped with the sampler in the first through-hole, the sampler is the T type, and outside the front end of sampler runs through.

Further, be fixed with spacing section of thick bamboo along the radial of outer sleeve in every first through-hole, the length of spacing section of thick bamboo is less than the length of the front end of sampler, the front end of sampler runs through first through-hole again after running through spacing section of thick bamboo and extends to outside the outer sleeve, and the cover is equipped with the spring on the sampler, the one end of spring and the rear end fixed connection of sampler, the other end and the spacing rear end fixed connection of section of thick bamboo of spring.

Further, both ends on the sleeve are provided with a top plate and a bottom plate which are used for plugging the annular cavity between the inner sleeve and the outer wall as well as the outer sleeve, and second through holes with the same inner diameter as the inner sleeve are formed in the centers of the top plate and the bottom plate.

Furthermore, the air cock sets up to a plurality ofly, the air cock runs through roof up end after-fixing on the roof.

The working process and principle of the invention are as follows:

before the dynamic sounding process is carried out, the invention is sleeved on a drill rod. When the dynamic penetration test drills to a certain depth, the annular air bag is inflated to expand the annular air bag, the expansion of the annular air bag gives a radial thrust to the sampler to push the sampler to extend outwards, the spring is compressed at the moment, and the front end of the sampler is inserted into the lateral hole wall; when the annular air bag is deflated, the compressed spring is recovered to drive the sampler to retract, and at the moment, the sampler is filled with a soil sample, so that one-time soil sample collection work is completed.

Compared with the prior art, the invention has the following beneficial effects:

1. the device is matched with a dynamic sounding device for use, and has simple and reliable structure, convenient application and low cost;

2. taking out a soil sample in the hole, and visually identifying the category of the soil;

3. with the increase of the number of the samplers, thin soil and lenticle soil samples in the geological environment are not easy to be omitted;

4. the accuracy of dividing the soil layer interface is greatly improved.

Drawings

FIG. 1 is a schematic structural view of the annular bladder of the present invention in an uninflated state.

Fig. 2 is a structural diagram illustrating an inflated state of the annular airbag according to the present invention.

Fig. 3 is a cross-sectional view of fig. 1.

Fig. 4 is a cross-sectional view of fig. 2.

Fig. 5 is a schematic structural view of the top plate of the present invention.

Fig. 6 is a schematic structural diagram of the bottom plate of the present invention.

In the figure: 1. an inner sleeve; 2. a limiting cylinder; 3. an annular air bag; 4. a sampler; 5. a top plate; 6. a base plate; 7. a spring; 8. an air tap; 9. an outer sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

As shown in fig. 1-5, the present embodiment provides a loop bar type in-situ lateral soil sampling device, which includes a sleeve for sleeving a drill rod during drilling, the sleeve includes an inner sleeve 1 and an outer sleeve 9 that are concentrically arranged, the inner sleeve 1 is used for sleeving the drill rod, an annular air bag 3 is disposed between an outer wall of the inner sleeve 1 and the outer sleeve 9, the annular air bag 3 is provided with an air nozzle 8, a plurality of first through holes (not shown in the figure) are formed in a wall of the outer sleeve 9, a sampler 4 is disposed in each first through hole, the sampler 4 is T-shaped, a front end of the sampler 4 penetrates through the first through hole and extends out of the outer sleeve 9, and a sampling port is formed at a front end of the sampler 4.

In this embodiment, in order to make sampler 4 only can radially move forward and backward along outer sleeve 9, be fixed with spacing section of thick bamboo 2 along the radial of outer sleeve 9 in every first through-hole, the length of spacing section of thick bamboo 2 is less than the length of the front end of sampler 4, the front end of sampler 4 runs through first through-hole again and extends outside outer sleeve 9 after running through spacing section of thick bamboo 2, the cover is equipped with spring 7 on the sampler 4, the one end of spring 7 and the rear end fixed connection of sampler 4, the other end of spring 7 and spacing section of thick bamboo 2 rear end fixed connection. When the annular air bag 3 is not inflated, the front end of the sampler 4 is positioned in the outer sleeve 9, so that the drilling process of the whole sleeve sleeved on a drill rod is not influenced, and when the annular air bag 3 is inflated, the sampler 4 is pushed to move outwards along the limiting cylinder 2; the spring 7 is arranged to allow the sampler 4 to be retracted into the outer sleeve 9 after the annular balloon 3 is then deflated.

In the practical use process, in order to prevent soil or slurry in the drilled hole from entering the annular cavity between the outer wall of the inner sleeve 1 and the outer sleeve 9, a top plate 5 and a bottom plate 6 for plugging the annular cavity between the outer wall of the inner sleeve 1 and the outer sleeve 9 are arranged at two ends of the sleeve, and a second through hole (not shown in the figure) with the same inner diameter as that of the inner sleeve 1 is formed in the centers of the top plate 2 and the bottom plate 6.

In addition, in order to inflate or deflate annular gasbag 3 fast, air cock 8 sets up to a plurality ofly, air cock 8 runs through roof 5 up end after-fixing on roof 5, and air cock 8 sets up the operation of also being convenient for on roof 5.

When the sleeve rod type in-situ lateral soil sampling device is used for sampling soil, the inner sleeve 1 is sleeved on a drill rod, when a dynamic penetration test drills to a certain depth, the annular air bag 3 is inflated to expand the annular air bag 3, the annular air bag 3 expands to provide a radial thrust for the shape sampler 4, the sampler 4 is pushed to extend outwards, the spring 7 is compressed at the moment, and the front end of the sampler 4 is inserted into a lateral hole wall; when the annular air bag 3 is deflated, the compressed spring 7 is recovered to drive the sampler 4 to retract, and at the moment, the sampler 4 is filled with a soil sample, so that one-time soil sample collection work is completed.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. The utility model provides a loop bar normal position side direction geotome, includes the sleeve that is used for the cover to place on the drilling rod when drilling, its characterized in that: the sleeve is including inner skleeve (1) and outer sleeve (9) that set up with one heart, and inner skleeve (1) are used for the cover to put on the drilling rod, be equipped with annular gasbag (3) between the outer wall of inner skleeve (1) and outer sleeve (9), annular gasbag (3) are equipped with air cock (8), a plurality of first through-holes have been seted up on the section of thick bamboo wall of outer sleeve (9), every be equipped with sampler (4) in the first through-hole, sampler (4) are the T type, and outside the front end of sampler (4) run through first through-hole and extend to outer sleeve (9), the sample connection had been seted up to the front end of sampler (.

2. The loop bar type in-situ lateral soil sampling device according to claim 1, wherein: be fixed with spacing section of thick bamboo (2) along the radial of outer sleeve (9) in every first through-hole, the length of spacing section of thick bamboo (2) is less than the length of the front end of sampler (4), the front end of sampler (4) runs through first through-hole again and extends to outside outer sleeve (9) after running through spacing section of thick bamboo (2), and the cover is equipped with spring (7) on sampler (4), the one end of spring (7) and the rear end fixed connection of sampler (4), the other end and the rear end fixed connection of spacing section of thick bamboo (2) of spring (7).

3. The loop bar type in-situ lateral soil sampling device according to claim 1, wherein: the two ends of the sleeve are provided with a top plate (5) and a bottom plate (6) which are used for plugging an annular cavity between the outer wall of the inner sleeve (1) and the outer sleeve (9), and the centers of the top plate (5) and the bottom plate (6) are provided with second through holes with the same inner diameter as that of the inner sleeve (1).

4. The loop bar type in-situ lateral soil sampling device according to claim 3, wherein: air cock (8) set up to a plurality of, air cock (8) are fixed on roof (5) after running through roof (5) up end.