A combined plate single cable foundation anchor rod internal force measuring device and method

Abstract

The present application belongs to the technical field of combined plate cable anchor internal force measuring device, and discloses a combined plate cable anchor internal force measuring device and method, the combined plate cable anchor internal force measuring method, comprising: the inclinometer is closely attached to the PVC pipe, the upper plate of the combined plate cable foundation is subjected to horizontal load, and the upper plate and the anchor rod are driven to bend and deform; after the upper plate and the anchor rod bend and deform, the inclinometer is subjected to tensile and compressive strain along the bending direction of the anchor rod, the tensile and compressive strain can be measured by the sensing optical fiber embedded therein, so that the displacement of the combined plate cable foundation in the horizontal direction is measured; the inclinometer is subjected to bending deformation, and the deformation value of the pipe body can be measured by the embedded sensing optical fiber; according to the deformation value of the inclinometer, the displacement of the upper plate and the anchor rod along the depth direction of the inclinometer can be calculated. The present application can realize the horizontal displacement monitoring resolution accuracy of 0.1mm / m.

Description

Technical Field

[0001] This invention belongs to the technical field of combined plate cable anchor internal force measuring instruments, and particularly relates to a device and method for measuring the internal force of a single cable foundation anchor rod in a combined plate cable system. Background Technology

[0002] Currently, the combined plate-cable foundation, as a new type of transmission line foundation, features good assembly performance, strong resistance to dynamic loads, high safety and reliability, fast construction speed, and low project cost. It has been piloted in transmission line projects with good results. During the pilot application of this foundation, in order to monitor its reliability, it is necessary to monitor the internal forces of the foundation anchors to study the impact of external loads on the combined plate-cable foundation.

[0003] Based on the above analysis, the problems and defects of the existing technology are as follows: the existing joint plate cable foundation anchor cable internal force measurement technology has low horizontal displacement monitoring resolution. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a device and method for measuring the internal force of anchor bolts in a combined plate cable single cable foundation.

[0005] The present invention is implemented as follows: a method for measuring the internal force of anchor bolts in a combined plate cable single cable foundation. The method for measuring the internal force of anchor bolts in a combined plate cable single cable foundation includes: Step 1, the inclinometer tube is tightly attached to the PVC pipe, and the plate of the combined plate cable foundation is subjected to a horizontal load, which will cause the upper plate and anchor bolt to bend and deform.

[0006] Step 2: After the upper plate and anchor rods undergo bending deformation, the inclinometer tube experiences tensile and compressive strains along the bending direction of the anchor rods. These tensile and compressive strains can be measured by the sensing optical fiber embedded in it, thereby measuring the horizontal displacement of the combined plate and cable foundation.

[0007] Step 3: The inclinometer tube undergoes bending deformation, and the deformation value of the tube body can be measured by the pre-embedded sensing optical fiber. Based on the deformation value of the inclinometer tube, the displacement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube can be calculated.

[0008] Furthermore, in step three, the specific calculation method for the displacement measurement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube is as follows:

[0009] The diameter of the inclinometer tube is H, and the height of the inclinometer tube is L. The strains measured along the height of the inclinometer tube via optical fiber are ε1, ε2, ε3, and ε4, respectively. Therefore, the micro-rotation angle can be determined according to the differential principle:

[0010] Therefore, the longitudinal displacement yz of the member is:

[0011]

[0012] Lateral displacement y y for:

[0013]

[0014] According to the superposition principle, the deflection of the inclinometer tube is:

[0015]

[0016] y represents the displacement along the height of the inclinometer tube.

[0017] Another objective of this invention is to provide a combined plate cable foundation anchor cable internal force measuring device for implementing the combined plate cable single cable foundation anchor cable internal force measuring method, wherein the combined plate cable foundation anchor cable internal force measuring device is provided with a bottom steel plate;

[0018] The bottom steel plate is connected to the bottom plate by a protective cap screwed to the end of a steel anchor rod, and a second gasket is provided between the bottom steel plate and the bottom plate.

[0019] Furthermore, the steel anchor bolt is provided with an anti-corrosion layer on the outside, and the outside of the anti-corrosion layer is a PVC pipe;

[0020] The outside of the PVC pipe is a clinometer tube, and a fiber optic grating dot string is pasted on the outside of the clinometer tube.

[0021] Furthermore, the fiber optic grating dot string is connected to the fiber optic strain analysis device via a fiber optic PVC conduit.

[0022] Furthermore, the upper plate is connected to the upper plate short column by screwing protective caps to the ends of steel anchor rods.

[0023] Furthermore, the upper plate short column is fixed with a first gasket by a protective cap screwed to the end of the anchor cable.

[0024] Combining all the above technical solutions, the advantages and positive effects of this invention are as follows: In this invention, the inclinometer tube is used to attach optical fibers and measuring points; the fiber optic grating string can measure the strain along the height of the anchor rod; the optical fiber PVC conduit is used to lead the optical fiber out of the ground for easy connection with the analytical device; the optical fiber strain analytical device is used to measure the strain, achieving a horizontal displacement monitoring resolution of 0.1 mm / m. Simultaneously, in this invention, the upper plate is connected to the upper plate short column via a protective cap screwed to the end of the steel anchor rod. When the upper plate moves the anchor rod, the four vertical optical fibers on the inclinometer tube can obtain the strain along the height of the inclinometer tube, thereby providing a method for calculating the displacement magnitude. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of the method for measuring the internal force of anchor bolts in a combined plate cable single cable foundation provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the anchor cable internal force measuring device for the combined plate cable foundation provided in an embodiment of the present invention.

[0028] Figure 3 This is an AA cross-sectional view provided in an embodiment of the present invention.

[0029] In the figure: 1. Fiber optic strain gauge; 2. Protective cap; 3. Anchor cable; 4. First gasket; 5. Fiber optic PVC conduit; 6. Upper plate short column; 7. Upper plate; 8. Inclinometer tube; 9. Fiber grating dot string; 10. Lower plate; 11. Bottom steel plate; 12. Second gasket; 13. Steel anchor; 14. Anchor anti-corrosion layer; 15. PVC pipe; 16. Inclinometer tube.

[0030] Figure 4 This is a schematic diagram of the arrangement of the inclinometer tube and optical fiber provided in an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] To address the problems existing in the prior art, the present invention provides a device and method for measuring the internal force of anchor bolts in a combined plate cable single cable foundation. The present invention will be described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the method for measuring the internal force of the anchor rod in a combined plate and cable foundation provided in this embodiment of the invention includes: S101: The inclinometer tube is tightly attached to the PVC pipe, and the plate of the combined plate and cable foundation is subjected to a horizontal load, which will cause the upper plate and the anchor rod to bend and deform.

[0034] S102: After the upper plate and anchor rods undergo bending deformation, the inclinometer tube experiences tensile and compressive strains along the bending direction of the anchor rods. These tensile and compressive strains can be measured by the sensing optical fiber embedded in it, thereby measuring the horizontal displacement of the combined plate and cable foundation.

[0035] S103: The inclinometer tube undergoes bending deformation. The deformation value of the tube body can be measured by the pre-embedded sensing optical fiber. Based on the deformation value of the inclinometer tube, the displacement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube can be calculated.

[0036] In S103 provided by this embodiment of the invention, the specific calculation method for the displacement measurement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube is as follows:

[0037] like Figure 4 As shown, the diameter of the inclinometer tube is H, and the height of the inclinometer tube is L. The strains measured by the optical fiber along the height direction of the inclinometer tube are ε1, ε2, ε3, and ε4, respectively. Therefore, the micro-rotation angle can be determined according to the differential principle:

[0038] Therefore, the longitudinal displacement yz of the member is:

[0039]

[0040] Lateral displacement y y for:

[0041]

[0042] According to the superposition principle, the deflection of the inclinometer tube is:

[0043]

[0044] y represents the displacement along the height of the inclinometer tube.

[0045] like Figures 2-3 As shown, in the combined plate cable foundation anchor cable internal force measuring device provided in this embodiment of the invention, the bottom steel plate 11 is connected to the bottom plate 10 through the protective cap 2 screwed to the end of the steel anchor rod 13, and a second gasket 12 is provided between the bottom steel plate 11 and the bottom plate 10.

[0046] An anchor bolt 13 is provided with an anchor bolt anti-corrosion layer 14 on the outside. The outside of the anchor bolt anti-corrosion layer 14 is a PVC pipe 15. The outside of the PVC pipe 15 is a clinometer tube 8. A fiber optic grating dot string 9 is attached to the outside of the clinometer tube 8. The fiber optic grating dot string 9 is connected to the fiber optic strain analysis device 1 through a fiber optic PVC conduit 5. The clinometer tube is used to attach the fiber optic cable and the measuring points. The fiber optic grating dot string can measure the strain along the height of the anchor bolt. The fiber optic PVC conduit is used to lead the fiber optic cable out to the ground for easy connection with the analysis device. The fiber optic strain analysis device is used to measure the strain.

[0047] The upper plate 7 is connected to the upper plate short column 6 by screwing a protective cap 2 to the end of the steel anchor rod 13. The upper plate short column 6 is fixed with a first gasket 4 by screwing a protective cap 2 to the end of the anchor cable 3. When the upper plate 7 moves the anchor rod, the four vertical optical fibers on the inclinometer tube can obtain the strain along the height of the inclinometer tube, so as to obtain the method for calculating the displacement.

[0048] The working principle of this invention is as follows: The inclinometer tube 8 is tightly attached to the PVC pipe 15. When the upper plate of the combined cable-stayed foundation is subjected to a horizontal load, it causes the upper plate 7 and steel anchor rod 13 to bend and deform. The inclinometer tube 8 then experiences tensile and compressive strains along the bending direction of the steel anchor rod 13. These strains can be measured by the pre-embedded sensing optical fiber, thereby determining the horizontal displacement of the combined cable-stayed foundation. The deformation value of the inclinometer tube 8 can be measured by the pre-embedded sensing optical fiber. Based on the deformation value of the inclinometer tube 8, the displacement of the upper plate and anchor rod along the embedment depth direction of the inclinometer tube 8 can be calculated.

[0049] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for measuring the internal force of anchor bolts in a combined plate-cable single-cable foundation, characterized in that, The method for measuring the internal force of anchor bolts in a combined plate-cable single-cable foundation includes: Step 1: The inclinometer tube is tightly attached to the PVC pipe. The combined plate and cable foundation is subjected to horizontal load, which will cause the upper plate and anchor rod to bend and deform. Step 2: After the upper plate and anchor rods undergo bending deformation, the inclinometer tube experiences tensile and compressive strains along the bending direction of the anchor rods. These tensile and compressive strains can be measured by the sensing optical fiber embedded in it, thereby measuring the horizontal displacement of the combined plate and cable foundation. Step 3: The inclinometer tube undergoes bending deformation, and the deformation value of the tube body can be measured by the pre-embedded sensing optical fiber; based on the deformation value of the inclinometer tube, the displacement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube can be calculated. In step three, the specific calculation method for the displacement measurement of the upper plate and anchor rod along the burial depth direction of the inclinometer tube is as follows: The diameter of the inclinometer tube is H, and the height of the inclinometer tube is L. The strains measured along the height of the inclinometer tube via optical fiber are ε1, ε2, ε3, and ε4, respectively. Therefore, the micro-rotation angle can be determined according to the differential principle: Therefore, the longitudinal displacement yz of the member is: ； Lateral displacement y y for: ； According to the superposition principle, the deflection of the inclinometer tube is: ; y represents the displacement along the height of the inclinometer tube.

2. A device for measuring the internal force of anchor cables in a combined slab-cable foundation, implementing the method for measuring the internal force of anchor cables in a combined slab-cable foundation as described in claim 1, characterized in that, The combined plate cable foundation anchor cable internal force measuring device is equipped with: Bottom steel plate; The bottom steel plate is connected to the bottom plate by a protective cap screwed onto the end of a steel anchor bolt, and a second gasket is provided between the bottom steel plate and the bottom plate. The steel anchor bolt is equipped with an anti-corrosion layer on the outside, and the outside of the anti-corrosion layer is a PVC pipe. The outside of the PVC pipe is a clinometer tube, and a fiber optic grating dot string is pasted on the outside of the clinometer tube; The fiber grating dot string is connected to the fiber strain analyzer via a fiber PVC conduit. The upper plate is connected to the upper plate short column by screwing protective caps to the ends of steel anchor rods; The upper plate short column is fixed with a protective cap and a first gasket by screwing the end of the anchor cable.

3. A method for measuring the internal forces of anchor cables in a combined plate-cable foundation, characterized in that, The method for measuring the internal force of anchor cables in a combined plate cable foundation uses the device for measuring the internal force of anchor cables in a combined plate cable foundation as described in claim 2.

4. A method for monitoring the impact of external loads on a combined slab-cable foundation, characterized in that, The method for monitoring the impact of external loads on the combined plate cable foundation uses the anchor cable internal force measuring device for the combined plate cable foundation as described in claim 2.

5. A terminal for measuring the internal force of anchor cables in a combined plate-cable foundation, characterized in that, The combined plate cable foundation anchor cable internal force measurement terminal is used to implement the combined plate cable single cable foundation anchor rod internal force measurement method of claim 1.

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