CN113502798B - Soil pressure box burying device and method suitable for soft soil area - Google Patents
Soil pressure box burying device and method suitable for soft soil area Download PDFInfo
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- CN113502798B CN113502798B CN202110680339.0A CN202110680339A CN113502798B CN 113502798 B CN113502798 B CN 113502798B CN 202110680339 A CN202110680339 A CN 202110680339A CN 113502798 B CN113502798 B CN 113502798B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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- General Engineering & Computer Science (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a soil pressure cell burying device suitable for soft soil areas, comprising: the tube wall of the tube is provided with a through hole; the transfer piece is arranged in the bobbin and is arranged at the perforation, and the transfer piece comprises an elastic piece fixed on the inner wall of the bobbin and opposite to the perforation, a movable plate with one side hinged with the upper part of the perforation and the other side of the bottom supported by the elastic piece, and an electromagnet fixed at the bottom of the movable plate; and the pushing rod is inserted into the barrel to push the movable plate to rotate, so that the soil pressure box adsorbed by the electromagnet penetrates through the through hole and is extruded into soil outside the barrel. The invention has the beneficial effects that: the device can be assembled on site, is simple and efficient, is easy to operate, can effectively meet the directional positioning test of the soil pressure in the soft soil layer, has considerable engineering practice expected effect and obvious economic advantage, can be manufactured according to different site conditions, has good applicability and convenient popularization, and has important significance for improving and improving the geotechnical engineering test technology.
Description
Technical Field
The invention relates to the technical field of rock and soil testing equipment, in particular to a soil pressure cell burying device and method suitable for soft soil areas.
Background
When structures such as a roadbed, a side slope, a dam, a tunnel, a soil embankment and the like exist in a soft soil area, a soil pressure cell is usually needed to monitor soil pressure stress. The traditional burying methods of the soil pressure sensor include a cloth hanging method, a gas cap method and a drilling method. The methods are widely applied in engineering, and the theory and practice are mature. The cloth hanging method is commonly used for embedding the soil pressure box in the building enclosure, the soil pressure box is installed at a certain position on nylon cloth, the nylon cloth is paved on the surface of a steel reinforcement cage, the steel reinforcement cage and the nylon cloth are placed downwards, concrete is poured after positioning, and the soil pressure box is pressed to the side wall of a soil layer along with the lateral thrust generated by the rising of the surface of the concrete. The gas cap method is to use the cylinder as the ejection device and the air source as the power to eject the sensor into the soil body, and compared with the cloth hanging method, the gas cap method has the advantages of more accurate positioning and more in-place installation, and can be regarded as a free field stress test, and the measured stress is closer to the stress of the soil body. The traditional drilling method is mainly applied to embedding of the soil pressure sensor, namely, slurry wall protection drilling is firstly carried out in a soil body, the soil pressure sensor is fixed on a customized thin-wall channel steel or a steel reinforcement cage, then the soil pressure sensor is embedded into a specified depth position in a drill hole along with the thin-wall channel steel or the steel reinforcement cage, fine sand is backfilled in the drill hole, and the soil pressure is tested after the fine sand is solidified.
These conventional embedding methods can meet the testing requirements, but have many disadvantages. The cloth hanging method is difficult to control the position and the direction of the buried soil pressure cell, so that measurement errors are caused; the gas cap method has complex devices, easily damaged equipment and components in the embedding process and higher cost of the embedding device; the thin-wall channel steel or the steel reinforcement cage in the drilling method has higher rigidity relative to the soil body, and is not coordinated with the lateral deformation of the soil body after being buried in the soil body, so that the precision of the soil pressure test result is influenced. The thin-wall channel steel or the reinforcement cage is high in price, so that the economical efficiency of the embedding method is low; the soil pressure sensor needs to be welded on a construction site, so that the operation is difficult and the installation efficiency is low.
Therefore, in order to solve the above problems, it is necessary to modify the existing testing apparatus and method, and a method for drilling and burying a soil pressure cell suitable for a soft soil area is proposed.
Disclosure of Invention
In view of the above, in order to solve the above problems of the conventional burying method of the soil pressure sensor, embodiments of the present invention provide a burying device and method of a soil pressure cell suitable for a soft soil area.
An embodiment of the present invention provides a soil pressure cell burying device suitable for a soft soil area, including:
the pipe wall of the pipe is provided with at least one through hole which can be penetrated by the soil pressure box;
the transfer piece comprises an elastic piece fixed on the inner wall of the bobbin and opposite to the perforation, a movable plate with one side hinged with the upper part of the perforation and the other side of the bottom supported by the elastic piece, and an electromagnet fixed at the bottom of the movable plate and used for adsorbing and releasing the soil pressure box;
and the pushing rod is inserted into the bobbin to push the movable plate to rotate, so that the soil pressure box adsorbed by the electromagnet penetrates through the through hole and is squeezed into soil outside the bobbin.
Further, the distance from the through hole to the bottom end of the bobbin is equal to the distance from the pre-installation position of the soil pressure box to the bottom of the drill hole.
Further, the through hole is a round hole with the diameter larger than that of the soil pressure cell.
Further, the diameter of the perforations is equal to the diameter of the bobbin.
Furthermore, a semi-ellipsoidal push block is arranged at the bottom of the push rod.
Further, the elastic part comprises a spring and an iron sheet, the spring is obliquely arranged, one end of the spring is fixedly connected with the inner wall of the bobbin, the other end of the spring is connected with the iron sheet, and the iron sheet supports the bottom of the movable plate.
The technical scheme of the soil pressure cell burying device suitable for the soft soil area provided by the embodiment of the invention has the following beneficial effects:
(1) the device can be assembled on site, is simple and efficient, is easy to operate, can effectively meet the directional positioning test of the soil pressure in the soft soil layer, has considerable engineering practice expected effect and obvious economic advantage, can be manufactured according to different site conditions, has good applicability and convenient popularization, and has important significance for improving and improving the geotechnical engineering test technology.
(2) Compared with the traditional soil pressure cell burying method, the soil pressure cell sensor is more convenient and more accurate to locate in the drill hole, and the soil pressure cell is better in contact with the soil layer.
(3) Can once accomplish burying underground of a plurality of soil pressure cell, it is efficient, and the device can have enough to meet the need use, reuse, reduce cost.
The embodiment of the invention also provides a soil pressure cell burying method suitable for the soft soil area, which uses the soil pressure cell burying device suitable for the soft soil area and comprises the following steps:
s1, respectively mounting a soil pressure cell on each transfer piece, and electrifying each electromagnet to adsorb and fix the soil pressure cell;
s2, the bobbin is lowered into the drilled hole, the lowering depth of the bobbin is adjusted, and the bobbin is rotated to enable each through hole to reach the pre-buried position of each soil pressure cell;
s3, the push rod is inserted into the bobbin, the push rod is lowered, and the push rod pushes against the movable plate and pushes the movable plate to rotate when passing through each transfer piece, so that the soil pressure box is driven to rotate to penetrate through the through hole, the soil pressure box is squeezed into soil at the pre-buried position of the soil pressure box, and the electromagnet is powered off to release the soil pressure box to be reserved in the soil.
Further, the electromagnet is connected with a power supply through a lead, the soil pressure cell is connected with a test device through a cable, and in the step S1, the lead and the cable are led out of the bobbin from the through hole when the soil pressure cell is installed.
Since the advantageous effects of the method for burying a soil pressure cell in a soft soil area according to the present invention are the same as those of the above-described device for burying a soil pressure cell in a soft soil area, a repeated description thereof will not be provided.
Drawings
Fig. 1 is a schematic view of a soil pressure cell burying device suitable for a soft soil area according to the present invention.
Fig. 2 is a top view of the bobbin 1 of fig. 1.
In the figure: 1-bobbin, 2-hinge, 3-elastic component, 4-movable plate, 5-electromagnet, 6-soil pressure box, 7-cable, 8-wire, 9-pushing rod, 10-power supply, 11-test equipment and 12-perforation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a soil pressure cell burying device suitable for soft soil areas, which is mainly suitable for assembling and fixing, fixed-point burying and data monitoring of soil pressure cells in soft soil layers, and the burying device mainly comprises a bobbin 1, a transfer member arranged in the bobbin 1, and a push rod 9.
Specifically, the bobbin 1 is a rigid cylindrical hollow pipe, wherein the pipe wall of the bobbin 1 is provided with at least one perforation 12 which can be penetrated by the soil pressure cell 6, and the number of the perforation 12 is consistent with the number of the pre-installed soil pressure cells 6, and can be one or more.
The perforations 12 are intended to allow the passage of the soil pressure cell 6 and are therefore of a suitable shape and size, and may be chosen in various ways without any particular limitation. The perforations 12 may be provided as circular holes having a diameter larger than the diameter of the earth pressure cell 6. Preferably, the diameter of the perforations 12 is equal to the diameter of the bobbin 1. Therefore, the soil pressure box 6 can pass through, and meanwhile, a large amount of soil can be prevented from entering the bobbin 1 when the soil pressure box 6 is extruded into a soil layer.
Further, for more accurate speed alignment positioning when burying the soil pressure cell 6. The distance from the through hole 12 to the bottom end of the bobbin 1 is equal to the distance from the pre-installation position of the soil pressure box 6 to the bottom of a drill hole. Thus, after the bobbin 1 is lowered to the drilled hole, the drilled hole is basically level with the pre-installation position of the soil pressure box 6, and the subsequent operation is convenient.
Referring to fig. 1 and 2, the rotating member may be provided in one or more number, which also corresponds to the number of the pre-installed soil pressure cell 6. Each transfer piece is arranged at one perforation 12, and each transfer piece comprises an elastic piece 3 fixed on the inner wall of the bobbin 1 opposite to the perforation 12, a movable plate 4 with one side hinged with the upper part of the perforation 12 and the other side supported by the elastic piece 3, and an electromagnet 5 fixed at the bottom of the movable plate 4 and used for adsorbing and releasing a soil pressure box 6.
Specifically, the movable plate 4 is a circular iron plate, and one side of the edge of the movable plate is hinged to the inner wall of the bobbin 1, for example, hinged by a hinge 2, so that the movable plate 4 can rotate around the hinge 2, and the rotation track just passes through the through hole 12. The other side of the edge of the movable plate 4 is supported by the elastic part 3, wherein the elastic part 3 comprises a spring and an iron sheet, the spring is obliquely arranged, one end of the spring is fixedly connected with the inner wall of the bobbin 1, the other end of the spring is connected with the iron sheet, the iron sheet supports the bottom of the movable plate 4, and the movable plate 4 extrudes the iron sheet and is separated from the iron sheet when being forced to rotate downwards.
The electromagnet 5 is fixed at the bottom of the movable plate 4, and is welded and fixed with the bottom of the movable plate 4 to form a whole, and the electromagnet 5 is driven to rotate together when the movable plate 4 rotates. The pre-installed soil pressure cell 6 is fixedly installed at the bottom of the electromagnet 5, and the electromagnet 5 generates an adsorption effect on the soil pressure cell 6 when being electrified so as to fix the soil pressure cell.
The pushing rod 9 is inserted into the bobbin 1 to push the movable plate 4 to rotate, so that the soil pressure box 6 adsorbed by the electromagnet 5 passes through the through hole 12 and is squeezed into soil outside the bobbin 1. The push rod 9 is a steel rod, a semi-ellipsoidal push block is further arranged at the bottom of the push rod, and the long axis of the push block is slightly smaller than the diameter of the pipe barrel 1.
When the pushing rod 9 is lowered, the pushing block extrudes the movable plate 4, the pushing block directly acts on the movable plate 4 to push the movable plate 4 to rotate so that one side of the movable plate 4 is separated from the elastic part 3, the movable plate 4 continuously rotates until the soil pressure box 6 penetrates through the through hole 12 and is extruded into the soil layer, the electromagnet is powered off to release the soil pressure box 6, so that the soil pressure box 6 is kept in the soil layer, and the burying of the soil pressure box 6 is completed.
In addition, referring to fig. 1 and 2, an embodiment of the present invention further provides a method for burying a soil pressure cell suitable for a soft soil area, where the method for burying a soil pressure cell suitable for a soft soil area is used, and includes the following steps:
s1, soil pressure boxes 6 are respectively mounted on the transfer members, and the electromagnets 5 are energized to fix the soil pressure boxes 6.
Before the soil pressure box 6 is installed, a hole is drilled in a pre-test soil layer to reach a test design depth, the diameter of the drilled hole is slightly larger than that of the bobbin 1, and the drilled hole is attached to the soil layer as much as possible.
When the soil pressure cell 6 is installed, the lines connected with the electromagnet 5 and the soil pressure cell 6 need to be processed in advance, wherein the electromagnet 5 is connected with a power supply 10 through a lead 8, the soil pressure cell 6 is connected with a testing device 11 through a cable 7, and therefore the lead 8 and the cable 7 are led out of the bobbin 1 through the perforation when the soil pressure cell 6 is installed.
S2, the bobbin 1 is lowered into a drill hole, the lowering depth of the bobbin 1 is adjusted, and the bobbin 1 is rotated to enable the through holes 12 to reach the pre-buried positions of the soil pressure boxes 6. The positions of the through holes 12 on the bobbin 1 correspond to the pre-embedded positions of the soil pressure boxes 6 in advance, so that the positions of the through holes 12 can be adjusted conveniently, and the efficiency is improved.
S3, inserting the pushing rod 9 into the bobbin 1, lowering the pushing rod 9, and the pushing rod 9 abuts against the movable plate 4 and pushes the movable plate 4 to rotate when passing through each transferring member, the movable plate 4 presses the elastic member 3 and separates from the elastic member, then the movable plate 4 rotates until the through hole 12 coincides with the through hole 12, and simultaneously drives the soil pressure box 6 to rotate and penetrate through the through hole 12, so that the soil pressure box 6 is pressed into the soil at the pre-buried position of the soil pressure box 6, and then the electromagnet 5 is powered off to release the soil pressure box 6 to remain in the soil, and the electromagnet 5 is separated from the soil pressure box 6.
And finally, after all the soil pressure boxes 6 are buried, slowly drawing out the bobbin 1, and then, slowly injecting sand into the drill hole, and stopping injecting after the sand overflows from the surface, wherein the sand can be reused at a later stage. And standing, and acquiring test data of the soil pressure cell 6 by adopting test equipment 11 according to test requirements after the sand consolidation is completed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a device is buried underground to soil pressure cell suitable for soft soil area, its characterized in that includes:
the pipe wall of the pipe is provided with at least one through hole which can be penetrated by the soil pressure box;
the transfer piece comprises an elastic piece fixed on the inner wall of the bobbin and opposite to the perforation, a movable plate with one side hinged with the upper part of the perforation and the other side of the bottom supported by the elastic piece, and an electromagnet fixed at the bottom of the movable plate and used for adsorbing and releasing the soil pressure box;
and the pushing rod is inserted into the bobbin to push the movable plate to rotate, so that the soil pressure box adsorbed by the electromagnet penetrates through the through hole and is squeezed into soil outside the bobbin.
2. A soil pressure cell burying device suitable for soft soil areas as claimed in claim 1, wherein: and the distance from the through hole to the bottom end of the bobbin is equal to the distance from the pre-installation position of the soil pressure box to the bottom of the drilled hole.
3. A soil pressure cell burying device suitable for soft soil areas as claimed in claim 1, wherein: the through hole is a round hole with the diameter larger than that of the soil pressure cell.
4. A soil pressure cell burying device suitable for soft soil areas as claimed in claim 3, wherein: the diameter of the perforations is equal to the diameter of the bobbin.
5. A soil pressure cell burying device suitable for soft soil areas as claimed in claim 1, wherein: and a semi-ellipsoidal push block is arranged at the bottom of the push rod.
6. A soil pressure cell burying device suitable for soft soil areas as claimed in claim 1, wherein: the elastic part comprises a spring and an iron sheet, the spring is obliquely arranged, one end of the spring is fixedly connected with the inner wall of the bobbin, the other end of the spring is connected with the iron sheet, and the iron sheet supports the bottom of the movable plate.
7. A soil pressure cell burying method suitable for soft soil areas is characterized by comprising the following steps: the soil pressure cell burying device suitable for the soft soil region according to any one of claims 1 to 6 is used, and comprises the following steps:
s1, respectively mounting a soil pressure cell on each transfer piece, and electrifying each electromagnet to adsorb and fix the soil pressure cell;
s2, the bobbin is lowered into the drilled hole, the lowering depth of the bobbin is adjusted, and the bobbin is rotated to enable each through hole to reach the pre-buried position of each soil pressure cell;
s3, the push rod is inserted into the bobbin, the push rod is lowered, and the push rod pushes against the movable plate and pushes the movable plate to rotate when passing through each transfer piece, so that the soil pressure box is driven to rotate to penetrate through the through hole, the soil pressure box is extruded into a soil layer at a pre-buried position of the soil pressure box, and the electromagnet is powered off to release the soil pressure box to be reserved in the soil layer.
8. A soil pressure cell burying method suitable for soft soil areas as claimed in claim 7, wherein: the electromagnet is connected with a power supply through a lead, the soil pressure cell is connected with a test device through a cable, and in the step S1, the lead and the cable are led out of the bobbin through the through hole when the soil pressure cell is installed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680339.0A CN113502798B (en) | 2021-06-18 | 2021-06-18 | Soil pressure box burying device and method suitable for soft soil area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110680339.0A CN113502798B (en) | 2021-06-18 | 2021-06-18 | Soil pressure box burying device and method suitable for soft soil area |
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| CN113502798A CN113502798A (en) | 2021-10-15 |
| CN113502798B true CN113502798B (en) | 2022-03-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104947645A (en) * | 2015-06-15 | 2015-09-30 | 上海交通大学 | Outer side wall earth pressure cell precession type embedding device and embedding method |
| US9763314B1 (en) * | 2015-08-07 | 2017-09-12 | Hrl Laboratories, Llc | Vapor cells with transparent alkali source and/or sink |
| CN110206005A (en) * | 2019-06-18 | 2019-09-06 | 中冶集团武汉勘察研究院有限公司 | For the earth pressure gauge transverse direction embedded device and method in structured clays |
| CN111997104A (en) * | 2020-08-10 | 2020-11-27 | 长江勘测规划设计研究有限责任公司 | Support for installing soil pressure gauge in deep foundation pit construction period and use method thereof |
| CN212670528U (en) * | 2020-06-20 | 2021-03-09 | 房昊 | Pre-buried fixing device of pore water pressure gauge |
-
2021
- 2021-06-18 CN CN202110680339.0A patent/CN113502798B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104947645A (en) * | 2015-06-15 | 2015-09-30 | 上海交通大学 | Outer side wall earth pressure cell precession type embedding device and embedding method |
| US9763314B1 (en) * | 2015-08-07 | 2017-09-12 | Hrl Laboratories, Llc | Vapor cells with transparent alkali source and/or sink |
| CN110206005A (en) * | 2019-06-18 | 2019-09-06 | 中冶集团武汉勘察研究院有限公司 | For the earth pressure gauge transverse direction embedded device and method in structured clays |
| CN212670528U (en) * | 2020-06-20 | 2021-03-09 | 房昊 | Pre-buried fixing device of pore water pressure gauge |
| CN111997104A (en) * | 2020-08-10 | 2020-11-27 | 长江勘测规划设计研究有限责任公司 | Support for installing soil pressure gauge in deep foundation pit construction period and use method thereof |
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