Prismatic borehole stress meter
By designing a prismatic drilled stress gauge, the problems of difficult installation and pressure drop in the existing technology are solved, and stable monitoring and accurate monitoring of comprehensive stress changes, especially monitoring of axial stress changes, are achieved.
Patent Information
- Application Number
- CN202423041231.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The existing drilling stress gauge has a cylindrical hydraulic oil pillow, which makes the installation and oiling process difficult and prone to pressure drop, and lacks the ability to monitor axial stress changes.
A prismatic borehole stress gauge is designed. The main oil naan is a prismatic structure, which is divided into two independent oil sac cavities inside. It contacts the borehole wall in a point contact manner and monitors the axial stress changes through the axial stress oil naan. Stable monitoring can be achieved using a small amount of hydraulic oil.
The stable installation and long-term use of the borehole stress gauge are achieved, the monitoring data is more accurate, and the changes in the up and down or left and right directions and axial stress of the borehole can be fully monitored.
Smart Images
Figure CN223469257U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the coal mine roadway stress monitoring technical field, concretely relates to a prismatic borehole stress meter. BACKGROUND
[0002] In the daily mining operation of coal mine, the mining of coal body will inevitably cause the redistribution of rock mass stress field, and the new stress field distribution state has an extremely important influence on the stability of roadway and stope, especially for deep mining mine, the rock burst caused by the high concentration of surrounding rock stress field occurs from time to time. The monitoring of rock burst can be directly reacted by the stress change of rock mass, and the borehole stress meter as the monitoring device of the stress change of mine roadway surrounding rock has been very widely used in the prior art, and the existing borehole stress meter basically adopts hydraulic oil pillow, and the cylindrical hydraulic oil pillow is put into the borehole, and the hydraulic oil pillow is in full contact with the borehole wall after being pressurized and injected, so that the stress change of the borehole can be monitored in real time. Since the hydraulic oil pillow is of cylindrical structure, the inside of the cylindrical hydraulic oil pillow needs to be filled with hydraulic oil during use, so as to play a monitoring role, and the installation and oil injection process are difficult. Moreover, since a large amount of hydraulic oil is used, the pressure drop problem is prone to occur during long-term use, which affects the normal work of the borehole stress meter. In addition, the existing borehole stress meter also lacks the monitoring ability of the stress change from the axial direction of the borehole. SUMMARY
[0003] In order to solve the problems in the prior art, the utility model patent designs a prismatic borehole stress meter to solve the problem that the existing borehole stress cannot accurately reflect the stress source direction of the borehole.
[0004] The technical scheme adopted by the utility model is: the borehole stress meter comprises a main oil pillow, the shape of the main oil pillow is prismatic structure, one end of the main oil pillow is fixedly connected with a fixing seat, the other end is connected with an axial stress oil pillow, an inclination sensor is assembled on the fixing seat, the axial stress oil pillow is connected with a third oil injection pipe, the third oil injection pipe is arranged along the axis of the main oil pillow and passes out from the fixing seat.
[0005] Further, a partition plate is arranged inside the main oil pillow along the axis, so as to divide the internal capsule of the main oil pillow into two mutually independent first oil capsule and second oil capsule, and the oil inlet ends of the first oil capsule and the second oil capsule are respectively connected with the first oil injection pipe and the second oil injection pipe through the fixing seat.
[0006] Further, the center position of the partition plate is integrally formed with an axial hole, and the third oil injection pipe of the axial stress oil pillow is arranged along the axial hole of the partition plate.
[0007] Further, the shape of the main oil pillow is a regular four-angled or regular six-angled structure, and the partition plate is arranged along the symmetry line of the prismatic structure.
[0008] Further, the first oil chamber and the second oil chamber of the main oil bag of the borehole stress meter are arranged in the up-down direction or the left-right direction in application.
[0009] Further, the axial stress oil bag is an axial fold structure capable of axial deformation and expansion.
[0010] Compared with the prior art, the utility model patent of the prismatic borehole stress meter has the following advantages: the main oil bag of the borehole stress meter is arranged in a prismatic structure, thereby reducing the volume of the internal cavity of the main oil bag; in application, only a small amount of hydraulic oil needs to be added to complete the pressurization operation of the main oil bag, and the stability of the oil bag pressure during long-time use can be ensured; the traditional cylindrical oil bag is changed from point contact with the circumferential surface of the borehole wall to point contact, the inside of the main oil bag is divided into two independent oil chambers, and the stress changes from the up-down or left-right directions of the borehole are monitored respectively, so that the monitoring data is more accurate; the end of the main oil bag of the borehole stress meter is provided with an axial stress oil bag, the axial stress oil bag is a fold structure capable of axial deformation and expansion, and the stress changes from the axial direction of the borehole can be monitored, so that the monitoring effect is more comprehensive. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a structural schematic view of the prismatic borehole stress meter.
[0012] Figure 2 is a sectional structural schematic view of the main oil bag of the prismatic borehole stress meter.
[0013] In the figure, 1 is the main oil bag, 2 is the axial stress oil bag, 3 is the fixed seat, 4 is the inclination sensor, 11 is the first oil chamber, 12 is the second oil chamber, 13 is the partition plate, 14 is the first oil injection pipe, 15 is the second oil injection pipe, 16 is the axial hole, and 21 is the third oil injection pipe. DETAILED DESCRIPTION
[0014] The utility model will be further described below in combination with the drawings and specific embodiments. The technical solutions in the embodiments of the utility model are clearly and completely described, and the described embodiments are only part of the embodiments of the invention, rather than all. Based on the embodiments in the invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the invention.
[0015] As Figure 1 , 2As shown, the utility model discloses a kind of embodiment of prismatic borehole stress meter, and the borehole stress meter in this embodiment includes main oil 1, one end of main oil 1 is fixedly connected with fixed seat 3, the other end is fixedly connected with axial stress oil 2, fixed seat 3 is equipped with inclination sensor 4 and cross push rod seat, inclination sensor 4 is electrically connected with the sensor outside borehole stress meter by signal line, and cross push rod seat is used to connect push rod.
[0016] In the embodiment, the shape of main oil 1 is regular hexagonal structure, and other prismatic structures can also be made according to the use requirements. The inside of main oil 1 is provided with a partition plate 13 along the symmetry line of the regular hexagonal structure, and the partition plate 13 is integrally formed with an axial hole 16 along the axis. The inside of main oil 1 is divided into two independent first oil chamber 11 and second oil chamber 12 by the partition plate 13, and the oil inlet ends of the first oil chamber 11 and the second oil chamber 12 are respectively connected with a first oil injection pipe 14 and a second oil injection pipe 15 through the fixed seat 3, and the first oil injection pipe 14 and the second oil injection pipe 15 are respectively connected with an external sensor and an oil injection pump through a three-way valve.
[0017] The axial stress oil 2 is an axial fold structure, which can deform and stretch along the axial direction. The oil inlet end of the axial stress oil 2 is connected with a third oil injection pipe 21, which is arranged along the axial hole 16 of the partition plate 13 of main oil 1 and extends out of the fixed seat 3, and the third oil injection pipe 21 is also connected with an external sensor and an oil injection pump through a three-way valve.
[0018] When the prismatic borehole stress meter disclosed by the utility model is applied, the push rod is used to push the main oil 1 and the axial stress oil 2 to the bottom of the roadway borehole, so that the end of the axial stress oil 2 abuts against the bottom of the hole. The placement posture of the main oil 1 is adjusted according to the value fed back by the inclination sensor 4, so that the first oil chamber 11 and the second oil chamber 12 of the main oil 1 are in vertical direction or horizontal direction, and then the oil injection pump is used to inject oil into the main oil 1 to the rated pressure, so that the main oil 1 is fully contacted with the wall of the borehole, and only a small amount of hydraulic oil needs to be added to complete the installation of the main oil 1, and then the oil injection pump is used to inject oil into the axial stress oil 2 to the rated pressure, so that the installation of the borehole stress meter is completed.
[0019] The above content is only a preferred embodiment of the present application, and cannot limit the implementation range of the present application, that is, any simple equivalent change and modification made according to the claims and description of the present application still belongs to the scope covered by the present application.
Claims
1. A prismatic borehole stress meter comprising a main oil cell, characterized by, The outer shape of the main oil bag is a prismatic structure, one end of the main oil bag is fixedly connected with a fixing seat, the other end is connected with an axial stress oil bag, an inclination sensor is assembled on the fixing seat, the axial stress oil bag is connected with a third oil injection pipe, the third oil injection pipe is arranged along the axis of the main oil bag and penetrates out of the fixing seat.
2. A borehole tiltmeter according to claim 1, wherein A partition is arranged along the axis inside the main oil bag, the inside of the main oil bag is divided into two independent first oil bag cavities and second oil bag cavities, the oil inlet ends of the first oil bag cavities and the second oil bag cavities are respectively connected with first oil injection pipes and second oil injection pipes penetrating through the fixing seat.
3. A borehole tiltmeter according to claim 2, wherein The center of the partition is integrally formed with an axial hole, the third oil injection pipe of the axial stress oil bag is arranged along the axial hole of the partition.
4. A borehole tiltmeter according to claim 3, wherein The outer shape of the main oil bag is a regular quadrangular prism or a regular hexagonal prism structure, the partition is arranged along the symmetry line of the prismatic structure.
5. A borehole tiltmeter according to claim 4, wherein The first oil bag cavities and the second oil bag cavities of the main oil bag of the borehole stress meter are arranged in the up-down direction or the left-right direction in application.
6. A borehole tiltmeter according to claim 1, wherein The axial stress oil bag is an axial fold structure and can be deformed and expanded in the axial direction.