Test device for measuring bearing capacity and displacement of spiral anchor foundation under dynamic load

Abstract

The present invention discloses a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load, comprising a table; a frame is vertically arranged on the table, the frame comprises a vertical rod fixedly connected to the table, a horizontal rod is arranged on the top of the vertical rod, and an exciter and a container are respectively located on both sides of the vertical rod; a first fixed pulley, a second fixed pulley, and a third fixed pulley are arranged on the horizontal rod, the first fixed pulley is located above the exciter, and the second fixed pulley and the third fixed pulley are located above the container; the spiral anchor rod is vertically arranged in the soil in the container, and a displacement sensor is arranged on the spiral anchor rod. The advantages of the present invention compared with the prior art are: the present device is a supplement to the tensile and horizontal lateral displacement bearing capacity and displacement measurement test of the spiral anchor foundation under dynamic load, making up for the deficiency that other devices can only measure data under static load; the same device can measure both tensile bearing capacity and displacement, and can measure horizontal lateral displacement bearing capacity and displacement.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical model test devices for civil engineering, in particular to a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load. Background Art

[0002] As the global climate anomaly problem intensifies, extreme weather such as strong winds frequently occur. Although strong winds will not cause a large number of houses to be damaged or collapsed like earthquakes, they can cause damage to simple houses and light steel-structured houses, the fall of exterior decorations and billboards of high-rise houses, and the collapse of trees and transmission towers, leading to traffic jams, power outages, property losses, and even casualties, which have a serious impact on the normal order of the city. More importantly, the frequency of strong winds has been very high in recent years, and the cumulative value of economic losses caused is basically not less than that of earthquake disasters.

[0003] The collapse of transmission towers under strong winds and the resulting large-scale power outages are the main reasons for causing huge economic losses and affecting the normal operation of cities. Accidents of transmission tower collapse caused by strong convection and strong wind weather occur frequently every year. For example, on June 14, 2005, a wind-induced collapse occurred at the 500kV 5237 line in Siyang, Jiangsu, an important node for the country's "West-to-East Power Transmission" and East China's "North-to-South Power Transmission", causing 10 transmission towers to collapse in succession at one time; in September 2008, the strong typhoon "Haigebi" damaged the 110kV Pingzha A and B lines in Yangjiang, causing 24 towers to collapse and the poles to tilt. 10 towers were tilted and deformed; in June 2009, 5 transmission towers of the 550kV 5291 Jiangjin Line Zhenjiang section in Jiangsu collapsed due to strong winds, causing the stable transmission capacity of the 500kV North-South Power Transmission Channel of the Jiangsu Power Grid to drop by 700,000 kilowatts; in July 2011, the No. 41 and No. 42 transmission towers of the 110kV Yuanjiang Line in Nantong, Jiangsu collapsed. The wind disaster caused the collapse of the transmission tower, resulting in the loss of power to the backup power supply of the Jianghai Bridge Transformer and dozens of lines were cut off. The collapse of the above transmission towers has caused large-scale power outages in East China. For current cities, power outages not only seriously affect normal production and life, but also bring strong resistance to post-disaster rescue and post-disaster recovery.

[0004] The dancing of wires in strong winds is the main cause of the collapse of transmission towers in strong wind weather. The dancing of wires will cause the towers connected to them to bear large dynamic loads, causing the connecting bolts on the transmission tower to loosen and the load-bearing components to fatigue and fracture, thus leading to the collapse of the transmission tower.

[0005] In order to effectively prevent the occurrence of dancing, a method of stopping dancing of dancing lines based on insulating cables under power outage conditions is adopted to effectively reduce the amplitude of line dancing and meet the safe operation of lines under medium- and short-term energized operation conditions. The main link that determines whether this method can be effectively implemented is that the bearing capacity of the spiral anchor foundation for anchoring insulating cables must meet the dynamic bearing capacity under strong winds. In addition, spiral anchors are often used as the anchoring foundation for structural windproof cables in other fields. At present, although domestic and foreign scholars have conducted a lot of research on the stress performance of spiral anchor rods under static loads, the stress characteristics of spiral anchor rods under dynamic loads have not yet been explored.

[0006] Therefore, a practical and simple test device for measuring the stress performance of spiral anchor foundation under dynamic load is in urgent need of research. Summary of the invention

[0007] The purpose of the present invention is to solve the problems mentioned in the background technology and to provide a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load.

[0008] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under a dynamic load, comprising a table, a container, a vibration exciter, a spiral anchor rod, and a load sensor;

[0009] A frame is vertically arranged on the table top, the frame includes a vertical rod fixedly connected to the table top, a horizontal rod is arranged on the top of the vertical rod, and the exciter and the container are respectively located on both sides of the vertical rod;

[0010] The horizontal rod is provided with a first fixed pulley, a second fixed pulley, and a third fixed pulley, wherein the first fixed pulley is located above the vibration exciter, and the second fixed pulley and the third fixed pulley are located above the container;

[0011] The spiral anchor rod is vertically arranged in the soil in the container, and a displacement sensor is arranged on the spiral anchor rod;

[0012] The vertical rods and the horizontal rods are connected in a hinged or fixed manner.

[0013] As a preferred solution, the vertical rod is hinged to the horizontal rod, a connecting rod is provided between the exciter and the horizontal rod, a counterweight is provided on the connecting rod, the top of the spiral anchor is fixedly connected to the horizontal rod, and the load sensor is located on the spiral anchor.

[0014] As a preferred solution, the vertical rod is fixedly connected to the horizontal rod and is constrained by relative rotation through pins. A cable is connected to the top of the exciter, and the cable passes through a first fixed pulley, a second fixed pulley, the top of the spiral anchor rod, and a third fixed pulley. The end of the cable away from the exciter is connected to the table top through a lightweight spring. The cable is in a taut state, and the load sensor is located on the cable.

[0015] As a preferred solution, the soil type is selected according to needs to simulate various application scenarios.

[0016] As a preferred solution, the first fixed pulley, the second fixed pulley and the third fixed pulley have the same size and weight.

[0017] Compared with the prior art, the advantages of the present invention are: clear structure, easy to use, the device is a supplement to the tensile and horizontal lateral bearing capacity and displacement measurement test of the spiral anchor foundation under dynamic load, and makes up for the deficiency that other devices can only measure data under static load; the same device can measure both the tensile bearing capacity and displacement and the horizontal lateral bearing capacity and displacement, and has multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the tensile bearing capacity and displacement measurement of the spiral anchor foundation under dynamic load of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the anti-horizontal lateral bearing capacity and displacement measurement of the spiral anchor foundation under dynamic load of the present invention.

[0020] As shown in the figure: 1. table, 2. container, 3. vibrator, 4. spiral anchor, 5. load sensor, 6. frame, 7. vertical rod, 8. horizontal rod, 9. first fixed pulley, 10. second fixed pulley, 11. third fixed pulley, 12. displacement sensor, 13. connecting rod, 14. counterweight, 15. pin, 16. cable, 17. lightweight spring. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the resulting method or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example 1

[0025] Combined with Figure 1 , a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load, comprising a table 1, a container 2, an exciter 3, a spiral anchor rod 4, and a load sensor 5;

[0026] A frame 6 is vertically arranged on the table 1, and the frame 6 includes a vertical rod 7 fixedly connected to the table 1, and a horizontal rod 8 is arranged on the top of the vertical rod 7, and the exciter 3 and the container 2 are respectively located on both sides of the vertical rod 7;

[0027] The horizontal rod 8 is provided with a first fixed pulley 9, a second fixed pulley 10, and a third fixed pulley 11, wherein the first fixed pulley 9 is located above the vibration exciter 3, and the second fixed pulley 10 and the third fixed pulley 11 are located above the container 2;

[0028] The spiral anchor rod 4 is vertically arranged in the soil in the container 2 , and a displacement sensor 12 is arranged on the spiral anchor rod 4 .

[0029] The vertical rod 7 is hinged to the horizontal rod 8 , a connecting rod 13 is provided between the vibration exciter 3 and the horizontal rod 8 , a counterweight 14 is provided on the connecting rod 13 , the top of the spiral anchor 4 is fixedly connected to the horizontal rod 8 , and the load sensor 5 is located on the spiral anchor 4 .

[0030] The soil type is selected according to needs and is used to simulate various application scenarios.

[0031] The first fixed pulley 9, the second fixed pulley 10, and the third fixed pulley 11 have the same size and weight.

[0032] When measuring the tensile bearing capacity and displacement, fill the container where the spiral anchor is located with the required soil to simulate various application scenarios. Then adjust the load on the right spiral anchor by using the vibrator and adding or removing the counterweight. The load is transmitted through the horizontal rod of the bracket. The horizontal rod is connected to the vertical rod by a pin to ensure that the horizontal rod can rotate freely. The load change and displacement change of the anchor are read out by the load sensor and displacement sensor on the spiral anchor respectively.

[0033] Example 2

[0034] Combined with Figure 2 , a test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load, comprising a table 1, a container 2, an exciter 3, a spiral anchor rod 4, and a load sensor 5;

[0035] A frame 6 is vertically arranged on the table 1, and the frame 6 includes a vertical rod 7 fixedly connected to the table 1, and a horizontal rod 8 is arranged on the top of the vertical rod 7, and the exciter 3 and the container 2 are respectively located on both sides of the vertical rod 7;

[0036] The horizontal rod 8 is provided with a first fixed pulley 9, a second fixed pulley 10, and a third fixed pulley 11, wherein the first fixed pulley 9 is located above the vibration exciter 3, and the second fixed pulley 10 and the third fixed pulley 11 are located above the container 2;

[0037] The spiral anchor rod 4 is vertically arranged in the soil in the container 2 , and a displacement sensor 12 is arranged on the spiral anchor rod 4 .

[0038] The vertical rod 7 is fixedly connected to the horizontal rod 8 and is constrained from relative rotation by a pin 15. A cable 16 is connected to the top of the vibrator 3. The cable 16 passes through the first fixed pulley 9, the second fixed pulley 10, the top of the spiral anchor 4, and the third fixed pulley 11. The end of the cable 16 away from the vibrator 3 is connected to the table 1 through a lightweight spring 17. The cable 16 is in a taut state, and the load sensor 5 is located on the cable 16.

[0039] The soil type is selected according to needs and is used to simulate various application scenarios.

[0040] The first fixed pulley 9, the second fixed pulley 10, and the third fixed pulley 11 have the same size and weight.

[0041] When measuring the bearing capacity and displacement of the horizontal lateral displacement, a pin is inserted to constrain the rotation of the device. A light spring is fixed on the right table of the device. One end of the loading cable is connected to the vibrator, and the other end is connected to the light spring on the right. The cable is in a taut state. The load sensor is installed on the cable, the vibrator is started, and the readings of each sensor are recorded in real time to complete the measurement. Since the displacement of the anchor rod is very small during the experiment, the vertical displacement can be ignored.

[0042] When the present invention is implemented, it can measure both the tensile bearing capacity and displacement and the anti-horizontal lateral displacement bearing capacity and displacement. The device is a supplement to the tensile and anti-horizontal lateral displacement bearing capacity and displacement measurement test of the spiral anchor foundation under dynamic load, making up for the deficiency that other devices can only measure data under static load.

[0043] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. The test device for measuring the bearing capacity and displacement of the screw anchor foundation under dynamic load is characterized by: Including table, container, vibrator, screw anchor, load sensor; A frame is vertically arranged on the table top, the frame includes a vertical rod fixedly connected to the table top, a horizontal rod is arranged on the top of the vertical rod, and the exciter and the container are respectively located on both sides of the vertical rod; The horizontal rod is provided with a first fixed pulley, a second fixed pulley, and a third fixed pulley, wherein the first fixed pulley is located above the vibration exciter, and the second fixed pulley and the third fixed pulley are located above the container; The spiral anchor rod is vertically arranged in the soil in the container, and a displacement sensor is arranged on the spiral anchor rod; The vertical rod is hinged to the horizontal rod, a connecting rod is provided between the vibration exciter and the horizontal rod, a counterweight is provided on the connecting rod, the top of the spiral anchor is fixedly connected to the horizontal rod, and the load sensor is located on the spiral anchor.

2. The test device for measuring the bearing capacity and displacement of the screw anchor foundation under dynamic load is characterized by: Including table, container, vibrator, screw anchor, load sensor; A frame is vertically arranged on the table top, the frame includes a vertical rod fixedly connected to the table top, a horizontal rod is arranged on the top of the vertical rod, and the exciter and the container are respectively located on both sides of the vertical rod; The horizontal rod is provided with a first fixed pulley, a second fixed pulley, and a third fixed pulley, wherein the first fixed pulley is located above the vibration exciter, and the second fixed pulley and the third fixed pulley are located above the container; The spiral anchor rod is vertically arranged in the soil in the container, and a displacement sensor is arranged on the spiral anchor rod; The vertical rod is fixedly connected to the horizontal rod and is constrained by a pin for relative rotation. A cable is connected to the top of the exciter. The cable passes through a first fixed pulley, a second fixed pulley, the top of the spiral anchor rod, and a third fixed pulley. The end of the cable away from the exciter is connected to the table top through a lightweight spring. The cable is in a taut state, and the load sensor is located on the cable.

3. The test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load according to claim 1, characterized in that: The soil type is selected according to needs and is used to simulate various application scenarios.

4. The test device for measuring the bearing capacity and displacement of a spiral anchor foundation under dynamic load according to claim 1 or 2, characterized in that: The first fixed pulley, the second fixed pulley and the third fixed pulley have the same size and weight.

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