CN211927256U - Enlarged footing stock crowd anchor test device - Google Patents
Enlarged footing stock crowd anchor test device Download PDFInfo
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- CN211927256U CN211927256U CN202020822661.3U CN202020822661U CN211927256U CN 211927256 U CN211927256 U CN 211927256U CN 202020822661 U CN202020822661 U CN 202020822661U CN 211927256 U CN211927256 U CN 211927256U
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Abstract
A test device for anchor group of an expanded head anchor rod comprises a transparent test box, a plurality of expanded head anchor rod models, a second servo hydraulic loading device and a first servo hydraulic loading device, wherein the plurality of expanded head anchor rod models are horizontally arranged in the test box; soil is filled in the box body, and the anchoring section model is buried in the middle of the soil and is tightly attached to the front side wall of the test box; the free section model of the enlarged footing anchor rod is connected with a first displacement meter and a tension and pressure sensor, and the anchoring section model is connected with a second displacement meter; the right ends of the free section models of the multiple enlarged head anchor rods are connected in parallel through steel plates, a digital camera is installed on the front side of the test box, and the digital camera is electrically connected with a computer. The utility model discloses can simulate the work progress of enlarged footing stock resistance to plucking in the laboratory to know single and many enlarged footing stocks and warp the influence law of peripheral soil body in the use stage.
Description
Technical Field
The utility model relates to a geotechnical engineering field especially relates to an enlarged footing stock crowd anchor test device.
Background
In the soft soil region of the southeast coastal region, because the strength of foundation soil is low, the ultimate uplift resistance of a common anchor rod is small, and the application of the anchor rod in a soft soil foundation is restricted. In order to improve the pulling resistance of the anchor rod in the soft soil foundation, engineering personnel research and develop the anchor rod with the enlarged head. The anchor rod adopts a high-pressure rotary spraying process, and a cylindrical anchoring section with a larger diameter is formed in a certain range at the bottom of the anchor rod, so that the pulling resistance of the anchor rod is obviously improved.
The anchor rod with the enlarged head has the advantages of high construction speed, high quality, small influence on the surrounding environment, capability of effectively improving the pulling resistance of the anchoring body and the like. However, the mechanism of action of the enlarged head anchor is not clear, so that the enlarged head anchor is still in the empirical design stage at present. In addition, the anchor rods are generally present in the form of a plurality of bolts in foundation pits and tunnel engineering. A plurality of anchor rods are arranged in a certain range, so that the anchor rods are influenced and restricted, the expected uplift resistance cannot be achieved, and the engineering hidden danger can be caused. The anchor rods are arranged at reasonable intervals, and the anchor rods have positive effects on safe, stable, economical and reasonable engineering. The action mechanism of the anchor rod group is further researched through an indoor model test, and the method has very important significance for safe application and popularization of the anchor rod with the enlarged head.
Disclosure of Invention
In order to overcome the problems, the utility model provides an enlarged footing anchor rod group anchor test device, which comprises a test box, a plurality of enlarged footing anchor rod models which are arranged in the test box in the horizontal direction, a second servo hydraulic loading device for drawing the plurality of enlarged footing anchor rod models, a first servo hydraulic loading device for vertically pressurizing a soil body, a first displacement meter, a second displacement meter, a tension pressure sensor, a digital camera and a computer;
the expansion head anchor model is divided into a free section model and an anchoring section model, the free section model is a threaded rod, a first sleeve for separating the threaded rod from a soil body is sleeved on the part of the threaded rod, which is positioned in the test box, the left end of the free section model is connected with the anchoring section model, the anchoring section model is of a semi-cylinder structure, the semi-cylinder structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the expansion head anchor rod models are horizontally arranged in the box body, and the expansion head anchor rod models are arranged in a stacking and spacing mode along the vertical direction;
the test box comprises a transparent box body, the top surface of the box body is provided with an opening for filling a soil body, and the opening is tightly matched with a cover plate; a reaction frame is erected at the top of the box body, a first servo hydraulic loading device which vertically extends downwards to load and apply pressure to the cover plate is arranged on the reaction frame, and the bottom end of the first servo hydraulic loading device is in contact with the upper surface of the cover plate;
the box body is internally provided with a soil body and an enlarged head anchor rod model embedded in the soil body, the left side wall and the right side wall of the box body are sequentially and symmetrically provided with a plurality of pairs of through holes for the enlarged head anchor rod model to pass through along the vertical direction, and the right side of the box body is a drawing end; the through hole is arranged at a position close to the front side of the box body, so that when the enlarged head anchor rod model is arranged in the through hole in a penetrating manner, the rectangular surface of the anchoring section model is tightly attached to the front side wall of the box body; a plurality of marking points are uniformly arranged on the front side wall of the box body;
the expanded head anchor rod model horizontally penetrates into the box body from a through hole on the right side of the box body along the central axis direction of the through hole, and the anchoring section model is buried in the middle of a soil body; the right parts of the free section models are exposed out of the box body, and the right ends of the free section models of the multiple enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the expansion head anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the expansion head anchor rod models, and the expansion head anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device for horizontally drawing the enlarged head anchor rod model; the part of the free section model, which is positioned outside the box body, is provided with a first displacement meter for measuring elastic displacement information of the free section model and a tension and pressure sensor for measuring the horizontal tension of the enlarged head anchor model, and the first displacement meter is connected with a threaded rod of the free section model through a small iron sheet;
the left end of the anchoring section model is connected with one end of a metal wire, the other end of the metal wire penetrates through a through hole in the left side of the box body to be connected with a second displacement meter for measuring horizontal displacement information of the enlarged head anchor rod model, and a second sleeve for isolating the metal wire from a soil body is sleeved on the part, located in the box body, of the metal wire;
the digital camera is electrically connected with the computer to transmit the shot displacement picture to the computer;
the first displacement meter, the second displacement meter and the tension and pressure sensor are respectively electrically connected with a computer so as to transmit the detected elastic displacement information, horizontal displacement information and horizontal tension to the computer;
the first servo hydraulic loading device and the second servo hydraulic loading device are respectively and electrically connected with a computer, and the computer controls the first servo hydraulic loading device and the second servo hydraulic loading device.
Furthermore, the plurality of mark points are arranged in a matrix form, and the distance between every two adjacent mark points is 10 cm.
Furthermore, the box body is made of toughened glass materials.
Further, the outer surface of the anchoring section model is coated with an epoxy resin layer.
Further, the cover plate is a steel plate.
Further, the anchoring section model is made of cement or rubber.
The utility model has the advantages that: the structure is simple, the operation is convenient, the laminating is practical, and the simulation of various working conditions can be realized. The construction process of uplift resistance of the expansion head anchor rod can be simulated in a laboratory, so that the influence rule of the single or multiple expansion head anchor rods on the deformation of the peripheral soil body in the use stage can be known. Utilize threaded rod and cement piece to constitute enlarged footing stock model, it is more practical to laminate, and the simulation effect is more accurate.
Drawings
Fig. 1 is a schematic structural diagram of an enlarged head anchor rod group anchor test device.
Fig. 2 is a schematic structural view of an enlarged head anchor.
Fig. 3 is a schematic view of the structure of the second displacement gauge fitted with a wire.
FIG. 4 is a schematic view of a fitting structure of the first displacement meter and the free-segment model.
Description of reference numerals: 1. a box body; 2. the front side wall of the box body; 3. a cover plate; 4. a reaction frame; 5. a first servo hydraulic loading device; 6. marking points; 7. anchoring the section model; 8. a first sleeve; 9. a free segment model; 10. erecting a rod; 11. small iron pieces; 12. a first displacement meter; 13. a metal wire; 14. a second displacement meter; 15. a second sleeve; 16. a second servo hydraulic loading device; 17. a pull pressure sensor; 18. a tripod; 19. a digital camera; 20. a computer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to the attached drawings, the anchor group test device for the expanded head anchor rods comprises a test box, a plurality of expanded head anchor rod models, a second servo hydraulic loading device 16, a first servo hydraulic loading device 5, a first displacement meter 12, a second displacement meter 14, a pulling pressure sensor 17, a digital camera 19 and a computer 20, wherein the plurality of expanded head anchor rod models are horizontally arranged in the test box;
the expansion head anchor model is divided into a free section model 9 and an anchoring section model 7, the free section model 9 is a threaded rod, a first sleeve 8 for separating the threaded rod from a soil body is sleeved on the part of the threaded rod, which is positioned in the test box, the left end of the free section model 9 is connected with the anchoring section model, the anchoring section model 7 is of a semi-cylinder structure, the semi-cylinder structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the anchoring section model 7 is made of cement or rubber, the outer surface of the anchoring section model 7 is coated with an epoxy resin layer, and soil particles are adhered to the outer surface of the anchoring section model 7. The expansion head anchor rod models are horizontally arranged in the box body, and the expansion head anchor rod models are arranged in a stacking and spacing mode along the vertical direction;
the test box comprises a transparent box body 1, and the box body 1 is made of toughened glass materials. The top surface of the box body 1 is provided with an opening for filling soil, a cover plate 3 is tightly matched with the opening, and the cover plate 3 is a steel plate; a reaction frame 4 is erected at the top of the box body 1, a first servo hydraulic loading device 5 which vertically extends downwards to load and apply pressure to the cover plate is arranged on the reaction frame 4, and the bottom end of the first servo hydraulic loading device 5 is in contact with the upper surface of the cover plate 3;
the box body 1 is internally provided with a soil body and an enlarged head anchor model embedded in the soil body, the left side wall and the right side wall of the box body 1 are sequentially and symmetrically provided with a plurality of pairs of through holes for the enlarged head anchor model to pass through along the vertical direction, and the right side of the box body 1 is a drawing end; the through hole is arranged at a position close to the front side of the box body 1, so that when the enlarged footing anchor rod model is arranged in the through hole in a penetrating manner, the rectangular surface of the anchoring section model 7 is tightly attached to the front side wall 2 of the box body; a plurality of mark points 6 are uniformly arranged on the front side wall 2 of the box body, the mark points 6 are arranged in a matrix form, and the distance between every two adjacent mark points 6 is 10 cm.
The expanded head anchor rod model horizontally penetrates into the box body 1 from a through hole on the right side of the box body along the central axis direction of the through hole, and the anchoring section model 7 is buried in the middle of a soil body; the right part of the free section model 9 is exposed out of the box body, and the right ends of the free section models 9 of the multiple enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the expansion head anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the expansion head anchor rod models, and the expansion head anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device 16 for horizontally drawing the enlarged head anchor model, and the second servo hydraulic loading device 16 is supported by the vertical rod 10; the part of the free section model 9, which is positioned outside the box body, is provided with a first displacement meter 12 for measuring elastic displacement information of the free section model 9 and a tension and pressure sensor for measuring the horizontal tension of the enlarged head anchor model, and the first displacement meter 12 is connected with a threaded rod of the free section model 9 through a small iron sheet 11;
the left end of the anchoring section model 7 is connected with one end of a metal wire 13, the other end of the metal wire 13 penetrates through a through hole on the left side of the box body 1 to be connected with a second displacement meter 14 for measuring horizontal displacement information of the expanded head anchor rod model, and a second sleeve 15 for isolating the metal wire from a soil body is sleeved on the part, located in the box body, of the metal wire;
the front side of the test box is provided with a digital camera 19 for shooting a displacement picture of the soil body, the digital camera 19 is supported by a tripod 18, and the digital camera 19 is electrically connected with a computer 20 so as to transmit the shot displacement picture to the computer 20;
the first displacement meter 12, the second displacement meter 14 and the tension and pressure sensor 17 are respectively electrically connected with the computer 20 so as to transmit the detected elastic displacement information, horizontal displacement information and horizontal tension to the computer 20;
the first servo hydraulic loading device 5 and the second servo hydraulic loading device 16 are respectively and electrically connected with a computer 20, and the computer 20 controls the first servo hydraulic loading device 5 and the second servo hydraulic loading device 16.
A test method of an enlarged head anchor rod group anchor test device comprises the following steps:
and 9, ensuring that the expansion head anchor rod model keeps clinging to toughened glass in the loading process, pressurizing and loading by adopting an oil pump through a second servo hydraulic loading device, automatically loading under the control of a computer, recording the actual loading amount by using a tension and pressure sensor, recording the readings of displacement meters on two sides, taking pictures by using a digital camera after each stage of loading, and recording the deformation of a soil body so as to simulate the process of the anti-pulling test of the expansion head anchor rod.
And step 10, analyzing related data, processing the soil deformation image by using software, observing the soil change before and after each level of loading, and preparing for subsequent research.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.
Claims (6)
1. The utility model provides an enlarged footing stock crowd anchor test device which characterized in that: the device comprises a test box, a plurality of expansion head anchor rod models, a second servo hydraulic loading device, a first displacement meter, a second displacement meter, a pull pressure sensor, a digital camera and a computer, wherein the expansion head anchor rod models are horizontally arranged in the test box;
the expansion head anchor model is divided into a free section model and an anchoring section model, the free section model is a threaded rod, a first sleeve for separating the threaded rod from a soil body is sleeved on the part of the threaded rod, which is positioned in the test box, the left end of the free section model is connected with the anchoring section model, the anchoring section model is of a semi-cylinder structure, the semi-cylinder structure is provided with a longitudinal section, and the longitudinal section is a rectangular surface; the expansion head anchor rod models are horizontally arranged in the box body, and the expansion head anchor rod models are arranged in a stacking and spacing mode along the vertical direction;
the test box comprises a transparent box body, the top surface of the box body is provided with an opening for filling a soil body, and the opening is tightly matched with a cover plate; a reaction frame is erected at the top of the box body, a first servo hydraulic loading device which vertically extends downwards to load and apply pressure to the cover plate is arranged on the reaction frame, and the bottom end of the first servo hydraulic loading device is in contact with the upper surface of the cover plate;
the box body is internally provided with a soil body and an enlarged head anchor rod model embedded in the soil body, the left side wall and the right side wall of the box body are sequentially and symmetrically provided with a plurality of pairs of through holes for the enlarged head anchor rod model to pass through along the vertical direction, and the right side of the box body is a drawing end; the through hole is arranged at a position close to the front side of the box body, so that when the enlarged head anchor rod model is arranged in the through hole in a penetrating manner, the rectangular surface of the anchoring section model is tightly attached to the front side wall of the box body; a plurality of marking points are uniformly arranged on the front side wall of the box body;
the expanded head anchor rod model horizontally penetrates into the box body from a through hole on the right side of the box body along the central axis direction of the through hole, and the anchoring section model is buried in the middle of a soil body; the right parts of the free section models are exposed out of the box body, and the right ends of the free section models of the multiple enlarged head anchor rod models are connected together through steel plates; the plane of the steel plate is vertical to the axial direction of the expansion head anchor rod model, a plurality of connecting holes are formed in the steel plate at positions corresponding to the expansion head anchor rod models, and the expansion head anchor rod models penetrate through the connecting holes and are fixedly connected with the steel plate; the right side of the steel plate is connected with a second servo hydraulic loading device for horizontally drawing the enlarged head anchor rod model; the part of the free section model, which is positioned outside the box body, is provided with a first displacement meter for measuring elastic displacement information of the free section model and a tension and pressure sensor for measuring the horizontal tension of the enlarged head anchor model, and the first displacement meter is connected with a threaded rod of the free section model through a small iron sheet;
the left end of the anchoring section model is connected with one end of a metal wire, the other end of the metal wire penetrates through a through hole in the left side of the box body to be connected with a second displacement meter for measuring horizontal displacement information of the enlarged head anchor rod model, and a second sleeve for isolating the metal wire from a soil body is sleeved on the part, located in the box body, of the metal wire;
the digital camera is electrically connected with the computer to transmit the shot displacement picture to the computer;
the first displacement meter, the second displacement meter and the tension and pressure sensor are respectively electrically connected with a computer so as to transmit the detected elastic displacement information, horizontal displacement information and horizontal tension to the computer;
the first servo hydraulic loading device and the second servo hydraulic loading device are respectively and electrically connected with a computer, and the computer controls the first servo hydraulic loading device and the second servo hydraulic loading device.
2. The enlarged head anchor rod group anchor testing device of claim 1, wherein: the plurality of mark points are arranged in a matrix form, and the distance between every two adjacent mark points is 10 cm.
3. The enlarged head anchor rod group anchor testing device of claim 1, wherein: the box body is made of toughened glass materials.
4. The enlarged head anchor rod group anchor testing device of claim 1, wherein: the outer surface of the anchoring section model is coated with an epoxy resin layer.
5. The enlarged head anchor rod group anchor testing device of claim 1, wherein: the cover plate is a steel plate.
6. The enlarged head anchor rod group anchor testing device of claim 1, wherein: the anchoring section model is made of cement or rubber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020822661.3U CN211927256U (en) | 2020-05-15 | 2020-05-15 | Enlarged footing stock crowd anchor test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020822661.3U CN211927256U (en) | 2020-05-15 | 2020-05-15 | Enlarged footing stock crowd anchor test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624480A (en) * | 2021-08-27 | 2021-11-09 | 四川交达预应力工程检测科技有限公司 | Synchronous group anchor test system |
| CN115791402A (en) * | 2022-12-08 | 2023-03-14 | 武汉理工大学 | Multi-directional coupling visual pile anchor loading device and pile anchor loading method |
-
2020
- 2020-05-15 CN CN202020822661.3U patent/CN211927256U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624480A (en) * | 2021-08-27 | 2021-11-09 | 四川交达预应力工程检测科技有限公司 | Synchronous group anchor test system |
| CN113624480B (en) * | 2021-08-27 | 2024-01-02 | 四川交达预应力工程检测科技有限公司 | Synchronous group anchor test system |
| CN115791402A (en) * | 2022-12-08 | 2023-03-14 | 武汉理工大学 | Multi-directional coupling visual pile anchor loading device and pile anchor loading method |
| CN115791402B (en) * | 2022-12-08 | 2024-02-09 | 武汉理工大学 | Multidirectional coupling visualized pile anchor loading device and pile anchor loading method |
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