CN112281833A - Anchor rod stress meter structure with shear resistance and installation method thereof - Google Patents
Anchor rod stress meter structure with shear resistance and installation method thereof Download PDFInfo
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- CN112281833A CN112281833A CN202011307466.8A CN202011307466A CN112281833A CN 112281833 A CN112281833 A CN 112281833A CN 202011307466 A CN202011307466 A CN 202011307466A CN 112281833 A CN112281833 A CN 112281833A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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Abstract
The invention discloses an anchor rod stress meter structure with shear resistance and an installation method thereof, belonging to the field of geotechnical engineering. The steel sleeve of this structure can not influence the axial force transmission of stock and stock stressometer, can also be with on stock stressometer self probably bears the shear force conduction to stress stock reinforcing bar to protection stock stressometer sensor position does not receive the deformation, avoids influencing true survey value because stock stressometer receives after cutting the bending, can also protect stock stressometer outlet in addition. The installation method is simple, strong in operability and remarkable in economic benefit.
Description
Technical Field
The invention belongs to the field of geotechnical engineering, and particularly relates to an anchor rod stressometer structure with shear resistance and an installation method thereof.
Background
In the excavation and construction process of geotechnical engineering, original stress fields can be redistributed, so that the geotechnical body deforms, and anchor rods commonly used in engineering are embedded into the geotechnical body, so that the self strength and the self-stability capability of the geotechnical are improved. The anchor rod anchoring support is widely applied to projects such as cavern excavation, side slope excavation, dam foundation stabilization and the like, and the anchor rod stress meter is arranged on the anchor rod and can measure the stress borne by the anchor rod where the anchor rod stress meter is located in the supporting process, so that the stress condition inside the rock body of the anchor rod support can be observed.
At present, the anchor rod stress meter is very popular in the aspect of monitoring the deformation of surrounding rocks and side slopes of underground caverns, and the experience of a differential resistance type instrument and a string type instrument which are used for a long time in China proves that the stress measurement value of a steel bar meter is reliable and the service life is long. The strain gauge and the steel bar gauge are designed, manufactured and calibrated according to axial stress of the gauge no matter in a chord type gauge or a differential resistance type gauge, and no instrument for directly measuring shear stress exists at present. The bending of the strain gauge leads to the distortion of the measured value of the instrument, for example: the steel plate gauge modified by the small strain gauge has a very high strain value because the bending deformation of the steel plate is too large; when a part of caverns or high slopes are excavated, the measured stress value of the anchor rod installed at the part with larger shearing force often exceeds the yield strength of the reinforcing steel bar, and the measured stress value is obviously distorted. Such distortion phenomena are commonly recognized in China. The anchor rod stress meter is a steel bar meter arranged in the rock, and certainly cannot be bent. In the technical specification for monitoring the safety of the concrete dam, the steel bar is arranged for timing, when the steel bar is in an arc shape, the curvature radius of the steel bar is more than 2m, and the steel sleeve in the middle of the steel bar meter is ensured not to be bent. Through retrieval, the related patents of the anchor rod stress meter or the steel bar meter do not consider a connection structure or a connection method adopted by how to facilitate construction, and the related patents of ensuring that the middle steel sleeve part of the steel bar meter is not bent are not available at present.
Disclosure of Invention
The invention aims to provide an anchor rod stressometer structure with shear resistance, which can reduce the shear force of a middle steel sleeve part of the anchor rod stressometer, and has the advantages of good structure stability, high strength and easy installation; it is another object of the present invention to provide a method of mounting the structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an ability stock stressmeter structure shears, includes stock stressmeter and steel sleeve, two models of female section of thick bamboo, son section of thick bamboo are divided to the steel sleeve, and the female section of thick bamboo of steel sleeve is installed in stock stressmeter outlet direction one end, and the reverse one end of steel sleeve son section of thick bamboo installation at the stock stressmeter outlet direction is the reducing structure, and the inside female screw that turns into of the great diameter one end of the female section of thick bamboo of steel sleeve, the outside male screw that turns into of the great diameter one end of the sub section of thick bamboo. The anchor rod stress meter is fixedly connected with the stress anchor rod, and the anchor rod stress meter is completely wrapped after the steel sleeve primary and secondary sleeves are connected.
Taking the length of a steel sleeve part of the anchor stress meter as an example of 12cm, the length of a steel sleeve female cylinder is 30-40cm, the wall thickness is 0.21cm, one end of the steel sleeve female cylinder is in the same specification with a welded steel bar (the inner diameter is larger than 1cm at the welded steel bar), the other end of the steel sleeve female cylinder is in the same specification with the anchor stress meter (the inner diameter is larger than 1.5cm at the steel sleeve part of the anchor stress meter), female threads are turned inside the steel sleeve female cylinder, the length of the female threads is 5cm, and a wire outlet hole groove is; the length of the steel sleeve cylinder is 30-40cm, the wall thickness is 0.21cm, one end of the steel sleeve cylinder is in the same specification with the welded steel bar (the inner diameter is larger than 1cm at the welded steel bar), the other end of the steel sleeve cylinder is in the same specification with the anchor rod stress meter (the inner diameter is larger than 1cm at the steel sleeve part of the anchor rod stress meter), male threads are turned on the outside of the steel sleeve cylinder, and the length of the male threads is 5 cm. The lengths of the steel sleeve mother cylinder and the steel sleeve son cylinder are preferably to cover two sections of welding positions.
The steel sleeve is a high-strength metal member, and is generally made of a material with yield strength of more than 500 MPa.
The invention also discloses an installation method of the anchor rod stress meter structure with the shear resistance, which comprises the following steps:
(1) forming holes according to requirements:
the borehole diameter should be greater than the maximum diameter of the steel sleeve parent barrel. The drilling direction should meet the design requirements and the hole bend should be smaller than the drilling radius. The drilled hole is flushed clean, and corrosive liquid is prevented from remaining.
(2) Welding an anchor rod stress meter:
according to the design requirement, the anchor rod is cut at the position where the anchor rod stress meter is installed, the steel sleeve female cylinder is sleeved on the anchor rod stress meter wire outlet direction one-end stress anchor rod in advance, the cable penetrates out of a wire outlet hole reserved in the steel sleeve female cylinder, the steel sleeve sub-cylinder is sleeved on the anchor rod stress meter wire outlet reverse one-end stress anchor rod in advance, then the two ends of the anchor rod stress meter are connected with the stress anchor rod according to a traditional butt welding mode, the anchor rod stress meter and the stress anchor rod are coaxial, and cooling and cable protection need to be noticed during welding.
(3) Connecting a steel sleeve:
the female sleeve and the sub sleeve of the steel sleeve are drawn close to the center of the anchor stress meter, the outlet of the anchor stress meter is clamped into the reserved bayonet of the female sleeve of the steel sleeve, the female sleeve of the steel sleeve is fixed, the sub sleeve of the steel sleeve is rotated, the steel sleeve and the anchor stress meter are fixed together through the internal and external threads of the female sleeve and the sub sleeve of the steel sleeve, the steel sleeve and the anchor stress meter are coaxial and can keep relative movement with a stress anchor rod, and the female sleeve of the steel sleeve is prevented from rotating during rotation.
(4) And (3) anchor rod installation:
and after the assembly is detected to be qualified, the assembled observation anchor rod is slowly sent into the drill hole. During installation, the anchor rod stress meter is ensured not to bend, the cable and the exhaust pipe are not damaged, and the root of the anchor rod is flush with the orifice. After the anchor rod stress is measured into the hole, a cable and an exhaust pipe are led out, a grouting pipe is installed, and the hole opening is sealed by cement mortar. And grouting and burying after the installation and detection are qualified.
Has the advantages that: compared with the prior art, the anchor rod stress meter structure with the shearing resistance is characterized in that a high-strength steel sleeve structure is adopted for protecting the sensor part of the anchor rod stress meter, when the anchor rod stress meter is subjected to shearing force, the shearing force can be transmitted to the anchor rod reinforcing steel bars through the external steel sleeve, the shearing resistance of the sensor part of the anchor rod stress meter is greatly improved, the influence on the axial stress transmission of the anchor rod and the anchor rod stress meter is avoided, meanwhile, the welding part of the anchor rod stress meter can be protected from being damaged by concentrated stress, the phenomenon that the measuring value of the anchor rod stress meter is abnormal after being sheared is avoided, and the accuracy of monitoring data is improved. The installation method adopts the steel sleeve structure for connection protection, has the advantages of simple operation, high installation speed, low price, strong operability and remarkable economic benefit, and can obviously improve the stability and accuracy of monitoring data.
Drawings
FIG. 1 is a schematic view of the anchor stress gauge configuration with shear capacity of the present invention;
FIG. 2 is a schematic view of the connection and welding sequence of the steel sleeve female cylinder, the steel sleeve male cylinder and the connecting steel bar with the anchor rod stress meter;
fig. 3 is an enlarged schematic view of the steel sleeve female cylinder of fig. 1.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
As shown in figure 1, the anchor rod stress meter structure with the shearing resistance comprises an anchor rod stress meter 1, a steel sleeve female cylinder 2 and a steel sleeve sub-cylinder 3, wherein the steel sleeve female cylinder 2 is installed at one end of the outlet direction of the anchor rod stress meter 1, the steel sleeve sub-cylinder 3 is installed at the reverse end of the outlet direction of the anchor rod stress meter 1 and is of a reducing structure, female threads 21 are turned inside one end of the steel sleeve female cylinder 2 with the larger diameter, and male threads 31 are turned outside one end of the steel sleeve sub-cylinder 3 with the larger diameter. The anchor stress meter 1 is connected with a stress anchor steel bar by adopting a welding method, after the welding strength meets the requirement, the steel sleeve female cylinder is fixed, and the steel sleeve female cylinder and the steel sleeve male cylinder are screwed tightly, so that the anchor stress meter is completely wrapped after the steel sleeve female cylinder and the steel sleeve male cylinder are connected.
The steel sleeve female barrel 2 and the steel sleeve sub-barrel 3 are fixedly connected through threads.
Taking the length of a steel sleeve part of an anchor rod stress meter as an example of 12cm, the length of a steel sleeve female cylinder is 30cm, the wall thickness is 0.21cm, one end of the steel sleeve female cylinder is in the same specification with a welded steel bar (the inner diameter is larger than 1cm at the welded steel bar), the other end of the steel sleeve female cylinder is in the same specification with the anchor rod stress meter (the inner diameter is larger than 1.5cm at the steel sleeve part of the anchor rod stress meter), a female thread 21 is turned inside the steel sleeve female cylinder, and the length of the; the length of the steel sleeve sub-cylinder 3 is 30cm, the wall thickness is 0.21cm, one end of the steel sleeve sub-cylinder is in the same specification with the welded steel bar (the inner diameter is larger than 1cm at the welded steel bar), the other end of the steel sleeve sub-cylinder is in the same specification with the anchor rod stress gauge (the inner diameter is larger than 1cm at the steel sleeve part of the anchor rod stress gauge), the external part of the steel sleeve sub-cylinder is turned into a male thread 31, the length of the male thread 31 is 5cm, and the external diameter of the male thread 31 of the steel. The female cylinder 2 of steel sleeve reserves outlet slot 22. An enlarged schematic view of the steel sleeve female 2 is shown in fig. 3. The lengths of the steel sleeve mother cylinder and the steel sleeve son cylinder are preferably to cover two sections of welding positions.
Example 2
A method of installing an anchor stress gauge structure having shear resistance, comprising the steps of:
(1) forming holes according to requirements:
the borehole diameter should be greater than the maximum diameter of the steel sleeve parent barrel. The drilling direction should meet the design requirements and the hole bend should be smaller than the drilling radius. The drilled hole is flushed clean, and corrosive liquid is prevented from remaining.
(2) Welding an anchor rod stress meter:
according to the design requirement, the anchor rod is cut off at the position where the anchor rod stress meter is installed, the steel sleeve female cylinder 2 is sleeved on the anchor rod stress meter wire outlet direction one-end stress anchor rod 5 in advance, the cable 41 penetrates out from the steel sleeve female cylinder reserved wire outlet hole 22, the steel sleeve sub-cylinder 3 is sleeved on the anchor rod stress meter wire outlet reverse one-end stress anchor rod 6 in advance, then the two ends 11 and 12 of the anchor rod stress meter are respectively connected with the anchor rod ends 51 and 61 according to the traditional butt welding mode, the anchor rod stress meter 1 and the stress anchor rod are coaxial, and cooling and cable protection need to be noticed during welding.
(3) Connecting a steel sleeve:
the steel sleeve female cylinder 2 and the steel sleeve sub-cylinder 3 are drawn close to the center of the anchor rod stress meter 1, the wire outlet 4 of the anchor rod stress meter 1 is clamped into the steel sleeve female cylinder reserved bayonet 22, the steel sleeve female cylinder 2 is fixed, the steel sleeve sub-cylinder 3 is rotated, the steel sleeve female cylinder 2 and the steel sleeve sub-cylinder 3 are fixed together through internal and external threads, the steel sleeve female cylinder 2 and the steel sleeve sub-cylinder 3 are coaxial with the anchor rod stress meter 1 and can keep relative movement with a stress anchor rod, and the steel sleeve female cylinder 2 is prevented from rotating during rotation so as to protect a cable.
(4) And (3) anchor rod installation:
and after the assembly is detected to be qualified, the assembled observation anchor rod is slowly sent into the drill hole. During installation, the anchor rod stress meter is ensured not to bend, the cable and the exhaust pipe are not damaged, and the root of the anchor rod is flush with the orifice. After the anchor rod stress is measured into the hole, a cable and an exhaust pipe are led out, a grouting pipe is installed, and the hole opening is sealed by cement mortar. And grouting and burying after the installation and detection are qualified.
Claims (3)
1. The utility model provides a stock stressmeter structure with ability of shearing which characterized in that: the anchor rod stress gauge comprises an anchor rod stress gauge and a steel sleeve; the steel sleeve is divided into a female sleeve and a sub sleeve, the female sleeve of the steel sleeve is arranged at one end of the outlet direction of the anchor rod stress meter, the sub sleeve of the steel sleeve is arranged at one end of the anchor rod stress meter opposite to the outlet direction of the anchor rod stress meter and is of a reducing structure, female threads are turned inside one end of the female sleeve of the steel sleeve with the larger diameter, and male threads are turned outside one end of the sub sleeve of the steel sleeve with the larger diameter; the anchor rod stress meter is fixedly connected with the stress anchor rod, and the anchor rod stress meter is completely wrapped after the steel sleeve primary and secondary sleeves are connected.
2. A shear capable anchor stressor structure of claim 1 wherein: the steel sleeve is made of a material with the yield strength of more than 500 MPa.
3. The installation method of the anchor rod stress meter structure with the shearing resistance is characterized by comprising the following steps of: the method comprises the following steps:
(1) forming holes according to requirements:
the diameter of the drilled hole is larger than the maximum diameter of the steel sleeve female cylinder, the drilling direction meets the design requirement, the hole bend is smaller than the drilling radius, the drilled hole is washed clean, and corrosive liquid is prevented from remaining;
(2) welding an anchor rod stress meter:
according to the design requirement, cutting off the anchor rod at the position where the anchor rod stress meter is installed, sleeving a steel sleeve female cylinder on a stress anchor rod at one end in the outlet direction of the anchor rod stress meter in advance, enabling a cable to penetrate through a preformed outlet hole of the steel sleeve female cylinder, sleeving a steel sleeve sub-cylinder on a stress anchor rod at the opposite end of the outlet line of the anchor rod stress meter in advance, connecting two ends of the anchor rod stress meter with the stress anchor rod according to a traditional butt welding mode, keeping the anchor rod stress meter and the stress anchor rod coaxial, and paying attention to cooling and cable protection during welding;
connecting a steel sleeve:
the method comprises the following steps of (1) approaching a steel sleeve female cylinder and a steel sleeve sub-cylinder to the center of an anchor rod stress meter, clamping a wire outlet of the anchor rod stress meter into a reserved bayonet of the steel sleeve female cylinder, fixing the steel sleeve female cylinder, rotating the steel sleeve sub-cylinder, fixing the steel sleeve female cylinder and the steel sleeve sub-cylinder together through the internal and external threads of the steel sleeve female cylinder and the steel sleeve sub-cylinder, ensuring that the steel sleeve and the anchor rod stress meter are coaxial and can keep relative movement with a stress anchor rod, and avoiding the steel;
(4) and (3) anchor rod installation:
after the assembly is detected to be qualified, the assembled observation anchor rod is slowly sent into the drill hole, and during installation, the anchor rod stress meter is ensured not to be bent, the cable and the exhaust pipe are not damaged, and the root of the anchor rod is flush with the orifice; after the anchor rod stress is measured into the hole, leading out a cable and an exhaust pipe, installing a grouting pipe, and sealing the hole opening by cement mortar; and grouting and burying after the installation and detection are qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011307466.8A CN112281833A (en) | 2020-11-20 | 2020-11-20 | Anchor rod stress meter structure with shear resistance and installation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011307466.8A CN112281833A (en) | 2020-11-20 | 2020-11-20 | Anchor rod stress meter structure with shear resistance and installation method thereof |
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| CN112281833A true CN112281833A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011307466.8A Pending CN112281833A (en) | 2020-11-20 | 2020-11-20 | Anchor rod stress meter structure with shear resistance and installation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117127666A (en) * | 2023-10-27 | 2023-11-28 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
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| CN109667264A (en) * | 2018-06-26 | 2019-04-23 | 湘潭大学 | A kind of installation guard method of fiber-optic grating sensor on overlength anchor cable |
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Patent Citations (7)
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| US20180171800A1 (en) * | 2015-07-10 | 2018-06-21 | Epiroc Canada Inc. | Shear and tensile reinforcement for inflatable bolt |
| CN106199886A (en) * | 2016-09-28 | 2016-12-07 | 广西大学 | A kind of intelligent steel strand containing fiber-optic grating sensor |
| CN207036150U (en) * | 2017-06-06 | 2018-02-23 | 曲靖师范学院 | A kind of sensor jacket device with defencive function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117127666A (en) * | 2023-10-27 | 2023-11-28 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
| CN117127666B (en) * | 2023-10-27 | 2024-01-26 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
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