CN114441286A - Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test - Google Patents

Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test Download PDF

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Publication number
CN114441286A
CN114441286A CN202111507802.8A CN202111507802A CN114441286A CN 114441286 A CN114441286 A CN 114441286A CN 202111507802 A CN202111507802 A CN 202111507802A CN 114441286 A CN114441286 A CN 114441286A
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CN
China
Prior art keywords
anchor rod
axial force
foundation pit
model test
accurately controlling
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CN202111507802.8A
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Chinese (zh)
Inventor
徐连坤
李钟顺
王若展
郭景琢
程雪松
周强
张润泽
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Tianjin University
China Construction Infrastructure Co Ltd
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Tianjin University
China Construction Infrastructure Co Ltd
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Application filed by Tianjin University, China Construction Infrastructure Co Ltd filed Critical Tianjin University
Priority to CN202111507802.8A priority Critical patent/CN114441286A/en
Publication of CN114441286A publication Critical patent/CN114441286A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The invention discloses a device for accurately controlling slow failure of an axial force of an anchor rod in a foundation pit model test, which comprises a tension meter and an axial force control mechanism of the anchor rod, wherein the tension meter and the axial force control mechanism of the anchor rod are connected to a simulation anchor rod, the axial force control mechanism of the anchor rod comprises a fixed support, a left linear guide rail, a right linear guide rail and a rotating screw rod are arranged on the fixed support and are parallel to each other, the rotating screw rod is driven by a variable frequency motor, the variable frequency motor is fixedly arranged on the fixed support and is controlled by a controller, a nut seat is connected to the rotating screw rod and is in sliding connection with the two linear guide rails, and a fixed platform connected with the simulation anchor rod is fixedly connected to one side of the nut seat. The invention can dynamically and accurately adjust the axial force of the anchor rod, thereby simulating the process of slow failure of the axial force of the anchor rod, and the invention has simple structure and convenient operation, can control the reduction rate of the axial force of the anchor rod, and simulates the actual damage process of the anchor rod under the conditions of corrosion and the like.

Description

Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test
Technical Field
The invention relates to a test device in foundation pit engineering, in particular to a device for accurately controlling the slow failure of the axial force of an anchor rod in a foundation pit model test.
Background
The anchor bolt support is used as a common foundation pit support system and is mainly used for the situations of large engineering scale, complex surrounding environment and irregular foundation pit shape. In the anchor rod supporting foundation pit, the reasonable use of the anchor rod can effectively control the deformation of the soil body, reduce the internal force of the enclosure structure, reduce the engineering cost and improve the construction efficiency. However, in actual engineering, the collapse accident of the foundation pit caused by improper design and construction of the anchor rod sometimes occurs.
In recent years, numerous scholars have analyzed a large number of bolting project instances or accident cases. For example, the statistical analysis is carried out on 35 bolting engineering cases by International Federation for construction (FIP), wherein the anchor rods in many projects have the risk of failure, and even the existing projects cause structural collapse due to the failure of the anchor rods. Research shows that the failure of the anchor rod can be caused by various factors, such as damage of an exposed anchor head, breakage of an anchor rod reinforcing steel bar caused by corrosion of a rib body, adhesion damage between a soil body and an anchoring section caused by insufficient grouting or underground water erosion, and the like.
Due to the complexity of the anchor bolt support system test, few model test researches aiming at the failure of the anchor bolt in the anchor bolt support foundation pit are developed at present. Practical cases show that the anchor rod is corroded and the like in the using process, the bearing capacity is gradually reduced, the failure process lasts for a certain time, and the anchor rod still bears a certain bearing capacity in the process. Most of current model tests are difficult to control the anchor rod to slowly lose efficacy, so a device for controlling the anchor rod axial force to slowly reduce in a foundation pit model test is needed to be provided, and the problem of simulating the anchor rod axial force to slowly lose efficacy in the current foundation pit anchor rod support model test is solved.
Disclosure of Invention
The invention provides a device for accurately controlling the slow failure of the axial force of an anchor rod in a foundation pit model test, which is used for simulating the process of the slow failure of the axial force of the anchor rod in foundation pit anchor rod support.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: the utility model provides a device of slow inefficacy of accurate control stock axial force in foundation ditch model test, is including connecting tensiometer and the stock axial force control mechanism on the simulation stock, stock axial force control mechanism includes the fixed bolster be equipped with about two linear guide and a rotatory lead screw on the fixed bolster, the three is parallel to each other, rotatory lead screw is driven by inverter motor, inverter motor adorns admittedly on the fixed bolster, by controller control be connected with the nut seat on the rotatory lead screw, the nut seat with two linear guide sliding connection one side rigid coupling of nut seat has the fixed platform of being connected with the simulation stock.
The fixed platform is connected with the simulation anchor rod through a fixed clamp, and the fixed clamp is arranged on the fixed platform.
And the fixed platform is provided with a connecting hole.
The fixing support is provided with a bottom plate, and the bottom plate is provided with a fixing mounting hole.
The fixed platform is made of a steel plate.
The invention has the advantages and positive effects that: in the test process, the controller is adopted to adjust the rotating speed of the motor, so that the nut seat, the fixed platform and the simulation anchor rod are controlled to ascend or descend, the axial force of the simulation anchor rod is increased or decreased along with the rotation, the tension meter is used for accurately measuring the axial force, the axial force of the anchor rod can be dynamically and accurately adjusted, and the process that the axial force of the anchor rod slowly fails is simulated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic front view of the bolt shaft force control mechanism of the present invention;
FIG. 3 is a side view of FIG. 2;
fig. 4 is a schematic diagram of the application of the present invention.
In the figure: 1. a controller; 2. a bolt shaft force control mechanism; 3. simulating an anchor rod; 4. a tension meter; 5. a variable frequency motor; 6. Fixing a bracket; 7. a coupling; 8. rotating the screw rod; 9. fixing the clamp; 10. fixing the platform; 11. a nut seat; 12. A base plate; 13. a linear guide rail; 14. simulating a support pile; 15. a crown beam; 16. a pulley.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 4, a device for accurately controlling slow failure of an anchor rod axial force in a foundation pit model test includes a tension meter 4 connected to a simulation anchor rod 3 and an anchor rod axial force control mechanism 2.
The anchor rod shaft control mechanism 2 comprises a fixed support 6, a left linear guide rail 13, a right linear guide rail 13 and a rotary screw rod 8 are arranged on the fixed support 6 and are parallel to each other, the rotary screw rod 8 is driven by a variable frequency motor 5, the variable frequency motor 5 is fixedly arranged on the fixed support 6, is controlled by a controller 1 and is connected with the rotary screw rod 8 through a coupler 7.
The rotary screw 8 is connected with a nut seat 11, the nut seat 11 is connected with the two linear guide rails 13 in a sliding manner, and one side of the nut seat 11 is fixedly connected with a fixed platform connected with the simulation anchor rod 3.
In this embodiment, the fixing platform 10 is connected to the simulation anchor rod 3 through a fixing clamp 9, and the fixing clamp 9 is disposed on the fixing platform 10. Connecting holes can also be arranged on the fixed platform 10 and used for connecting the simulation anchor rods 3. The fixing support 6 is provided with a bottom plate 12, and the bottom plate 12 is provided with a fixing mounting hole, so that the fixing support 6 can be conveniently mounted and fixed. The fixed platform 10 is made of steel plate.
Referring to fig. 4, the application of the above device includes the following steps:
1) fixing the anchor rod axial force control mechanism at a set position according to the test requirement;
2) placing the simulation support piles 14, the crown beams 15, the simulation anchor rods and the like at preset positions of the foundation pit, and preparing a model soil body;
3) and connecting a tension meter on the simulation anchor rod, bypassing the pulley 16 and anchoring the simulation anchor rod on a fixed platform, debugging and erecting test monitoring equipment, simulating foundation pit excavation, stopping excavation after excavating to a preset depth, and detecting various detection indexes such as axial force of the anchor rod. In addition, accurate axial force prestress can be applied to the anchor rod in the excavation process, and the use of a prestressed anchor rod in engineering is simulated.
4) The adjustment controller makes stock fixed platform according to the required speed decline of test, and stock axial force slowly reduces this moment, reaches the effect that stock axial force slowly reduces.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (5)

1. A device for accurately controlling the slow failure of the axial force of an anchor rod in a foundation pit model test is characterized by comprising a tension meter connected with a simulated anchor rod and an anchor rod axial force control mechanism,
the anchor rod axial force control mechanism comprises a fixed support, a left linear guide rail, a right linear guide rail and a rotary screw rod which are parallel to each other are arranged on the fixed support, the rotary screw rod is driven by a variable frequency motor, the variable frequency motor is fixedly arranged on the fixed support and is controlled by a controller,
and a nut seat is connected to the rotary screw rod, the nut seat is connected with the two linear guide rails in a sliding manner, and a fixed platform connected with the simulation anchor rod is fixedly connected to one side of the nut seat.
2. The device for accurately controlling the slow failure of the axial force of the anchor rod in the foundation pit model test according to claim 1, wherein the fixing platform is connected with the simulation anchor rod through a fixing clamp, and the fixing clamp is arranged on the fixing platform.
3. The device for accurately controlling the slow failure of the axial force of the anchor rod in the foundation pit model test according to claim 1, wherein a connecting hole is formed in the fixed platform.
4. The device for accurately controlling the slow failure of the axial force of the anchor rod in the foundation pit model test according to claim 1, wherein the fixing support is provided with a bottom plate, and a fixing and mounting hole is formed in the bottom plate.
5. The device for accurately controlling the slow failure of the axial force of the anchor rod in the foundation pit model test according to claim 1, wherein the fixed platform is made of a steel plate.
CN202111507802.8A 2021-12-10 2021-12-10 Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test Pending CN114441286A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111507802.8A CN114441286A (en) 2021-12-10 2021-12-10 Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111507802.8A CN114441286A (en) 2021-12-10 2021-12-10 Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test

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CN114441286A true CN114441286A (en) 2022-05-06

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CN202111507802.8A Pending CN114441286A (en) 2021-12-10 2021-12-10 Device for accurately controlling slow failure of axial force of anchor rod in foundation pit model test

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021004015A1 (en) * 2019-07-05 2021-01-14 山东科技大学 Bolt (cable) support structure test, and anchoring system performance comprehensive testing device and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021004015A1 (en) * 2019-07-05 2021-01-14 山东科技大学 Bolt (cable) support structure test, and anchoring system performance comprehensive testing device and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王若展: "桩锚支护基坑局部锚杆失效引发的连续破坏机理研究", 《万方数据知识服务平台》, pages 2 *
郑刚;雷亚伟;程雪松;李溪源;王若展;: "局部锚杆失效对桩锚基坑支护体系的影响及其机理研究", 岩土工程学报, no. 03 *

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