A limit slot type anchor cable dynamometer bearing pad device

Abstract

The present invention provides a limiting slot type anchor dynamometer bearing pad device, which belongs to the field of geotechnical engineering technology. The device includes a main body base, an annular limiting groove, a limiting rib plate and a pad center hole. The steel strand of the anchor cable passes through the pad center hole. The annular limiting groove fixes the thick wall of the alloy steel cylinder of the anchor dynamometer in an embedded form. At the same time, the limiting rib plate is welded to the main body base to prevent the anchor dynamometer from slipping on the bearing pad in a double fixing manner. Through the above-mentioned double optimization of the original bearing pad, it can be ensured that the installation base surface of the anchor dynamometer is perpendicular to and accurately aligned with the direction of the central axis of the borehole to avoid excessive eccentric loads. At the same time, the phenomenon of the anchor dynamometer slipping on the bearing pad during the tensioning of the anchor bundle is eliminated to avoid small or distorted measured values.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to a limit slot type anchor dynamometer bearing pad device. Background Art

[0002] As my country's transportation network continues to develop in depth, the stability monitoring of high and steep road cutting slopes formed by artificial excavation is becoming increasingly important. As one of the most commonly used monitoring technologies in slope monitoring, anchor cable stress monitoring can measure the sliding force in the landslide body through high-sensitivity sensors deployed on anchor cables in highway slope reinforcement projects, thereby realizing monitoring and early warning of local stability of anchoring projects. In slope anchor cable stress monitoring, the anchor cable dynamometer needs to be installed at the anchor head to measure the change of anchor cable load. The installation base of the anchor cable dynamometer must be perpendicular to the center axis of the borehole and accurately aligned to avoid excessive eccentric loads. However, in actual projects, during the tensioning process of the anchor bundle, it may often exceed the installation deviation range, which will cause the anchor cable dynamometer to slip on the bearing pad, resulting in the anchor cable dynamometer measuring value being too small or distorted.

[0003] The limit slot type anchor dynamometer bearing pad device limits the outer wall of the alloy steel cylinder of the anchor dynamometer by the limit ribs, and the thick wall of the alloy steel cylinder of the anchor dynamometer is embedded in the annular limit groove, so as to accurately align and prevent the anchor dynamometer from slipping on the bearing pad during installation, and ensure that the pressure-bearing surface is flat and combined so that the load is evenly transferred. The biggest advantage of this method is that it fully considers the deviation caused by the slip of the anchor dynamometer on the bearing pad when the anchor cable is tensioned, and prevents excessive eccentric load caused by slip through the double improvement of the bearing pad. At the same time, the structural design of the limit slot type anchor dynamometer bearing pad is reasonable and simple, and can be prefabricated into standard parts in a targeted manner, which is convenient for implementation in situations where the slope geological conditions are complex, the site and equipment are limited, etc. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a limit slot type anchor dynamometer bearing pad device, so as to accurately align and prevent the anchor dynamometer from slipping and causing eccentric loads during installation. The device limits the error caused by the slipping of the anchor dynamometer on the bearing pad during the tensioning of the anchor cable by limiting the outer wall of the alloy steel cylinder of the anchor cable dynamometer through the limit rib plate, and limiting the thickness of the alloy steel cylinder of the anchor cable dynamometer through the annular limit groove, so as to solve the problems such as the error caused by the artificial installation of the anchor dynamometer during the tensioning of the anchor cable.

[0005] The device includes a main body base, an annular limiting groove, limiting ribs and a center hole of a pad. The center hole of the pad is set at the center of the main body base, and the outside of the center hole of the pad is an annular limiting groove, and a plurality of limiting ribs are evenly arranged on the outer ring of the annular limiting groove. During installation, the bottom surface of the bearing pad is connected to the pier or the working anchor plate, and the top surface of the bearing pad is connected to the anchor cable dynamometer through the constraints of the annular limiting groove on the top surface and the limiting ribs. The steel strand of the prestressed anchor cable passes through the center hole of the pad, and the prestressed anchor cable is locked by the locking device.

[0006] The inner diameter of the annular limit groove is 80mm, the outer diameter is 110mm, the groove depth is 3mm, and the center of the main body base is taken as the center of the circle. The groove is prefabricated on the main body base.

[0007] There are three limit ribs with specifications of 10×5×5mm. Every two limit ribs are 120° apart and welded to the main base.

[0008] The limiting rib plate fixes the anchor dynamometer by limiting the outer wall of the alloy steel round tube.

[0009] The prefabricated annular limiting groove of the bearing pad fixes the thick wall of the alloy steel round tube of the anchor dynamometer in an embedded manner.

[0010] The specifications of the main base are 200×200×20mm.

[0011] The beneficial effects of the above technical solution of the present invention are as follows:

[0012] In the above scheme, the device specifically proposes double optimization improvements of the annular limit groove and the limit rib plate, which can facilitate centering, avoid slippage of the anchor dynamometer on the bearing pad during tensioning, and eliminate the error influence caused by it. It is easy to construct on site and has strong operability. It can be widely used in anchor stress monitoring of highway, mining, water conservancy and hydropower projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the bearing pad device of the limit slot type anchor cable dynamometer of the present invention;

[0014] Figure 2 It is an isometric view of the three-dimensional structure of the bearing pad device of the limit slot type anchor dynamometer of the present invention;

[0015] Figure 3 It is a schematic diagram of the installation of the limit slot type anchor dynamometer bearing pad device of the present invention.

[0016] Among them: 1-main base, 2-annular limiting groove, 3-limiting rib, 4-center hole of pad, 5-prestressed anchor cable, 6-anchoring area, 7-retaining wall, 8-pier, 9-bearing pad, 10-loading device, 11-locking device, 12-working anchor plate, 13-anchor cable dynamometer. DETAILED DESCRIPTION

[0017] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and embodiments.

[0018] The invention provides a limit slot type anchor cable dynamometer bearing pad device.

[0019] like Figure 1 and Figure 2 As shown, the device includes a main body base 1, an annular limiting groove 2, a limiting rib plate 3 and a pad center hole 4. The pad center hole 4 is arranged at the center of the main body base 4, and the outside of the pad center hole 4 is an annular limiting groove 2. A plurality of limiting rib plates are evenly arranged on the outer ring of the annular limiting groove 2. Figure 3 As shown, the system for installing the device includes a prestressed anchor cable 5, an anchoring area 6, a retaining wall 7, a buttress 8, a bearing pad 9, a loading device 10, a locking device 11, a working anchor plate 12, and an anchor cable dynamometer 13. The bottom surface of the bearing pad 9 is connected to the buttress 8 or the working anchor plate 12, and its top surface is connected to the anchor cable dynamometer 13 through the constraints of the prefabricated annular limiting groove 2 and the limiting rib 3 on the top surface. The steel strand of the prestressed anchor cable 5 passes through the center hole 4 of the pad and is locked by the locking device 11; the annular limiting groove 2 of the bearing pad 9 fixes the thick wall of the alloy steel cylinder of the anchor cable dynamometer 13 by embedded placement; at the same time, the limiting rib 3 welded on the main base 1 fixes the anchor cable dynamometer 13 by limiting the outer wall of the alloy steel cylinder.

[0020] The steel strand of the anchor cable passes through the center hole of the pad and is locked by a locking device; the thick wall of the alloy steel cylinder of the anchor cable dynamometer is fixed in the form of an embedded annular limit groove to prevent the anchor cable dynamometer from slipping on the bearing pad during the tensioning of the anchor cable; at the same time, the limit ribs welded on the main body base restrict the outer wall of the alloy steel cylinder of the anchor cable dynamometer to prevent the anchor cable dynamometer from slipping on the bearing pad. Through the above double optimization of the original bearing pad, it can be ensured that the installation base surface of the anchor cable dynamometer is perpendicular to the center axis of the borehole and accurately aligned to avoid excessive eccentric loads, and it can also eliminate the slippage of the anchor cable dynamometer on the bearing pad during the tensioning of the anchor bundle to avoid small or distorted measured values.

[0021] The main purpose of the annular limit groove 2 and the limit rib 3 is not only to ensure that the installation base surface of the anchor dynamometer is perpendicular and accurately aligned with the center axis of the drill hole to avoid excessive eccentric load, but also to eliminate the slippage of the anchor dynamometer on the bearing pad during the anchor bundle tensioning process, thereby avoiding small or distorted measured values.

[0022] In the specific implementation process, the steps are as follows:

[0023] S1: On the slope where the monitoring instrument is to be installed, drilling monitoring holes and installing prestressed anchor cables 5.

[0024] S2: Place the load-bearing pad 9, the anchor dynamometer 13, the load-bearing pad 9, and the working anchor plate 12 in sequence.

[0025] S3: After the anchor dynamometer 13 is installed in place, read and record the initial reading before loading (under zero load state).

[0026] S4: The steel hinge wire is tensioned in a whole bundle and in stages so that the anchor dynamometer 13 is evenly stressed. During loading, the reading should be taken after the load is stable.

[0027] S5: After the anchor cable is tensioned, the anchor cable dynamometer cable is connected to the monitoring channel of the monitoring host.

[0028] The device analyzes the causes and error influences of the slip of the anchor dynamometer on the bearing pad, and specifically proposes double optimization improvements of the annular limit groove and the limit rib plate. It can be accurately aligned to avoid the slip of the anchor dynamometer on the bearing pad during the tensioning process and eliminate the error influence caused by it. It has simple on-site construction and strong operability, and can be widely used in anchor stress monitoring in highway, mining, water conservancy and hydropower projects.

[0029] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A limit slot type anchor cable dynamometer bearing pad device, characterized in that: It comprises a main body base (1), an annular limiting groove (2), a limiting rib plate (3) and a pad center hole (4), wherein the pad center hole (4) is arranged at the center of the main body base (1), the outside of the pad center hole (4) is an annular limiting groove (2), and a plurality of limiting rib plates (3) are evenly arranged on the outer ring of the annular limiting groove (2); When the bearing pad (9) composed of the main body base (1), the annular limiting groove (2), the limiting rib plate (3) and the pad center hole (4) is installed, the bottom surface of the bearing pad (9) is connected to the pier (8) or the working anchor plate (12), and the top surface of the bearing pad (9) is connected to the anchor cable dynamometer (13) through the constraints of the top surface annular limiting groove (2) and the limiting rib plate (3), and the steel strand of the prestressed anchor cable (5) passes through the pad center hole (4), and the prestressed anchor cable (5) is locked by the locking device (11); The limiting rib plate (3) fixes the anchor cable dynamometer (13) by limiting the outer wall of the alloy steel round tube thereof; The annular limiting groove (2) fixes the thick wall of the alloy steel round tube of the anchor cable dynamometer (13) in an embedded manner.

2. The limit slot type anchor cable dynamometer bearing pad device according to claim 1 is characterized in that: The annular limiting groove (2) has an inner diameter of 80 mm, an outer diameter of 110 mm, a groove depth of 3 mm, and is prefabricated on the main body base (1) with the center of the main body base (1) as the center of the circle.

3. The position-limiting slot type anchor cable dynamometer bearing pad device according to claim 1 is characterized in that: There are three limit ribs (3) with specifications of 10×5×5 mm. Every two limit ribs are 120° apart and are welded to the main body base (1).

4. The position-limiting slot type anchor cable dynamometer bearing pad device according to claim 1 is characterized in that: The specifications of the main base (1) are 200×200×20 mm.

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