CN106370335B - Pressure box fixing device for measuring rock surrounding rock-lining contact pressure - Google Patents
Pressure box fixing device for measuring rock surrounding rock-lining contact pressure Download PDFInfo
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- CN106370335B CN106370335B CN201610917582.9A CN201610917582A CN106370335B CN 106370335 B CN106370335 B CN 106370335B CN 201610917582 A CN201610917582 A CN 201610917582A CN 106370335 B CN106370335 B CN 106370335B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention discloses a pressure cell fixing device for measuring rock surrounding rock-lining contact pressure, which comprises an annular pressure cell seat support, wherein a plurality of fixing support arms fixedly arranged on the surrounding rock are arranged on the peripheral surface of the pressure cell seat support along the circumferential direction; a pressure reducing ring is arranged on one end face of the pressure box seat support, the direction of the central axis of the pressure reducing ring is consistent with that of the central axis of the pressure box seat support, a hollow cavity of the pressure reducing ring is a containing cavity for placing a pressure box, and an asphalt bag for contacting with surrounding rocks is arranged on one side, close to the pressure box seat support, of the containing cavity; and a limiting device used for limiting the pressure box in the accommodating cavity is further arranged. The auxiliary fixing device can accurately measure the surrounding rock-lining contact pressure of the rock, and has the advantages of accurate measurement of the contact pressure, simple structure and convenient and quick installation.
Description
Technical Field
The invention belongs to supporting measurement auxiliary equipment of underground engineering such as coal mines, tunnel engineering, hydraulic engineering and the like, and particularly relates to a pressure box fixing device for measuring rock surrounding rock-lining contact pressure.
Background
In tunnel construction, the contact pressure of surrounding rock-lining belongs to one of the selected measurement items. However, for the surrounding rock-lining contact pressure measurement of the rock surrounding rock, at present, because the contact pressure is measured by selecting a steel string type soil pressure cell, the pressure cell is difficult to be tightly attached to the rock surface of the surrounding rock during measurement, even if the surrounding rock is rock in the tight attachment, the surrounding rock pressure is difficult to be accurately measured according to the principle of the steel string pressure cell, and meanwhile, due to the fact that concrete shrinks and is tightly wrapped on the side face of the pressure cell, the serious distortion and even the error of measurement data can be caused.
Aiming at the condition that a steel string type pressure box is inaccurate in measurement of the lithologic surrounding rock-lining contact pressure, a fixing device for vertically arranging a soil pressure box is disclosed in a Chinese patent with the patent number of CN201420351029.X, and is used for fixing the soil pressure box in roadbed engineering monitoring, and the invention discloses a fixing device for horizontally arranging the soil pressure box in the Chinese patent with the patent number of CN201410300017.9, and is used for fixing the soil pressure box in the roadbed engineering monitoring engineering. Chinese patent No. CN201220698095.5 discloses a pressure cell fixing device, which is provided with a pressure cell groove, a plurality of expansion screw holes, a plurality of screws and an iron wire on a steel plate. The pressure cell groove is used for laying the pressure cell, and the inflation screw hole is used for passing the inflation screw, and the steel sheet can be twisted into to the screw, and the iron wire is fixed on the screw. In a word, the existing rock surrounding rock-lining soil pressure cell fixing device is only applicable to the soil surrounding rock, the fixing device changes the stress state of a region to be detected, the shrinkage influence of side concrete is not considered, and the like, the actual monitoring effect is not ideal, and the device is not beneficial to popularization and application in actual engineering.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide the auxiliary fixing device which can accurately measure the rock surrounding rock-lining contact pressure by using the steel string pressure box, and has the advantages of accurate contact pressure measurement, simple structure and convenient and quick installation.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a pressure cell fixing device for measuring the contact pressure between the rock surrounding rock and the lining comprises an annular pressure cell seat support, wherein a plurality of fixing support arms for fixing on the surrounding rock are arranged on the outer peripheral surface of the pressure cell seat support along the circumferential direction; a pressure reducing ring is arranged on one end face of the pressure box seat support, the direction of the central axis of the pressure reducing ring is consistent with that of the central axis of the pressure box seat support, a hollow cavity of the pressure reducing ring is a containing cavity for placing a pressure box, and an asphalt bag for contacting surrounding rocks is arranged on one side, close to the pressure box seat support, of the containing cavity; a limiting device used for limiting the pressure box in the containing cavity is further arranged.
As preferred scheme, stop device includes that three all establish the spacing support arm at decompression ring peripheral surface along circumference, and spacing support arm is the type of falling L, and it includes horizontal segment and vertical section, and vertical section sets up perpendicularly on the pressure cell seat holds in the palm, and horizontal segment and decompression ring upper end interval certain distance have seted up first spacing hole and the spacing hole of second on horizontal segment and the vertical section respectively.
Preferably, the number of the fixed support arms is three, and the fixed support arms are provided with fixing holes for mounting expansion bolts.
Preferably, the length of the fixed arm is 28-32 cm.
Preferably, the length of the fixed arm is 30 cm.
Preferably, the pressure box base is made of steel materials.
Preferably, the pressure reducing ring is made of a cellular foam.
Preferably, one end of the fixed support arm is provided with a tenon, and the pressure box base support is provided with a mortise matched with the tenon.
Compared with the prior art, the invention has the beneficial effects that:
1. the pressure box base support is tightly fixed on the surrounding rock through the fixed support arm to form a reliable transportation channel, and the circular asphalt bag, the pressure box and the honeycomb pressure reducing ring can be tightly fixed through the pressure box base support through the positioning bolts; the length of the fixed support arm is 30cm, so that the influence of expansion bolts on the surrounding rock pressure of a region to be tested is reduced, the distance between the positioning bolt holes of the fixed support arm and the pressure box is 25cm, in the fixing process, the test surface avoids a surrounding rock pressure change region caused by the fixation of the expansion bolts, and the test precision is improved;
2. the accuracy of the pressure measurement of the pressure cell is ensured by the arrangement of the asphalt bag, and meanwhile, the influence of concrete shrinkage on the sensor is reduced due to the arrangement of the honeycomb pressure reducing ring; an asphalt bag is placed between the rock face and the pressure box test face, so that the problem that the pressure box test face cannot form effective bending or local stress difference caused by uneven rock face due to higher rock face rigidity is avoided; the honeycomb pressure reducing ring can effectively reduce the influence of the shrinkage of the concrete lining on the measurement accuracy of the pressure box after the pressure box is buried;
3. closely inject the pressure cell in holding the cavity through stop device, prevent to take place to remove at the test process of rock matter country rock-lining contact pressure, avoid influencing the test effect.
Drawings
FIG. 1 is a top view of an embodiment of the present invention.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
The labels in the figure are: 1. pressure cell seat holds in palm, 2, spacing support arm, 201, first spacing hole, 202, the spacing hole of second, 3, the ring that reduces pressure, 4, fixed support arm, 401, fixed orifices, 5, hold the cavity, 6, pitch bag.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example (b): as shown in fig. 1 and fig. 2, a pressure cell fixing device for measuring rock surrounding rock-lining contact pressure comprises an annular pressure cell seat support 1, wherein three fixing support arms 4 for fixing on the surrounding rock are arranged on the outer circumferential surface of the pressure cell seat support 1 along the circumferential direction, the fixing support arms 4 are welded on the outer wall surface of the pressure cell seat support 1, the included angle between every two fixing support arms 4 is 120 degrees, and fixing holes 401 for installing expansion bolts are formed in the fixing support arms 4; the length of the fixed support arm is 28-32cm, preferably 30cm, the distance between the fixed hole 401 and the pressure box is 25cm, and the influence of the expansion bolt on the surrounding rock pressure of the area to be measured is reduced.
One end surface of the pressure box seat support 1 is provided with a pressure reducing ring 3, and the pressure reducing ring 3 is made of honeycomb type foam plastics. The pressure reducing ring 3 is in a hollow cylindrical shape, and the wall thickness of the pressure reducing ring is 0.5 cm; the axis of decompression ring 3 is unanimous with the axis direction that the pressure cell seat held in the palm 1, the cavity of decompression ring 3 holds the cavity 5 for being used for placing the pressure cell, the inner wall surface of honeycomb decompression ring 3 and the outer wall surface of pressure cell closely laminate, the one side that is close to pressure cell seat support 1 that holds cavity 5 is equipped with and is used for the pitch bag 6 with the country rock contact, place the pitch bag between rock face and pressure cell test face, avoid rock face rigidity great and cause the unable local stress difference that effectively bends or the rock face is uneven to arouse of formation of pressure cell test face.
Still be equipped with and be used for prescribing the stop device in holding cavity 5 with the pressure cell, stop device includes that three all establishes the spacing support arm 2 at 3 peripheral surfaces of decompression ring along circumference, spacing support arm 2 is the type of falling L, it includes horizontal segment and vertical section, vertical section sets up perpendicularly on pressure cell seat support 1, horizontal segment and 3 upper ends of decompression ring keep at a distance apart, first spacing hole 201 and the spacing hole 202 of second have been seted up respectively on horizontal segment and the vertical section, the perpendicular distance of the spacing hole 202 distance pressure cell seat support 1 of second is 1-3cm, preferably 2 cm. Closely inject the pressure cell in holding cavity 5 through stop device, prevent that the pressure cell from taking place to remove in the test procedure, influencing test effect.
A tenon is arranged at one end of the fixed support arm 4, and a mortise matched with the tenon is arranged on the pressure box base 1.
The pressure box, the asphalt bag 6 and the surrounding rock wall are tightly attached by arranging the limiting bolts in the first limiting hole 201 and the second limiting hole 202, and the distance between the horizontal section and the pressure box is 1 cm.
The pressure box seat support 1 is made of steel materials, and the diameter of the pressure box seat support is 1cm larger than that of the pressure box.
When specifically burying underground, overlap the pressure cell in honeycomb decompression ring earlier, the one end of pressure cell near the rock face adds the pitch bag and closely laminates with the rock mass, overlaps the whole cover of fixing device in honeycomb decompression ring outside, through set up expansion bolts in the fixed orifices of fixed support arm 4 so that this fixing device is fixed with the rock mass, and the rethread adjusts stop bolt and makes pressure cell, pitch bag and rock mass closely laminate.
The working principle of the invention is as follows: the pressure box, the asphalt bag and the pressure reducing ring are fixed on the surface of a rock body together by the pressure box base and the fixed support arm, the length of the fixed support arm is 30cm, a fixed hole formed in the fixed support arm is 25cm away from the pressure box, and in the fixing process, a test surface avoids a surrounding rock pressure change area caused by the fixation of the expansion bolt, so that the test precision is improved; meanwhile, the asphalt sac is placed between the rock face and the pressure box test face, so that the problem that the pressure box test face cannot be effectively bent or the rock face is uneven to cause local stress difference due to high rock face rigidity is avoided; the pressure reducing ring can effectively reduce the influence of the shrinkage of the concrete lining on the measurement accuracy of the pressure box after the pressure box is buried. The bitumen sac herein is a filled sachet, which is easily deformable in volume.
Claims (4)
1. The utility model provides a measure rock quality country rock-lining contact pressure's pressure cell fixing device which characterized in that: the pressure box comprises an annular pressure box seat support (1), wherein a plurality of fixed support arms (4) fixedly arranged on surrounding rocks are arranged on the peripheral surface of the pressure box seat support (1) along the circumferential direction; a pressure reducing ring (3) is arranged on one end face of the pressure box seat support (1), the direction of the central axis of the pressure reducing ring is consistent with that of the central axis of the pressure box seat support (1), a hollow cavity of the pressure reducing ring (3) is a containing cavity (5) for placing a pressure box, and an asphalt bag (6) which is used for being in contact with surrounding rocks is arranged on one side, close to the pressure box seat support (1), of the containing cavity (5); a limiting device used for tightly limiting the pressure box in the accommodating cavity (5) is also arranged;
the limiting device comprises three limiting support arms (2) which are arranged on the peripheral surface of the pressure reducing ring (3) along the circumferential direction, the limiting support arms (2) are in an inverted L shape and comprise horizontal sections and vertical sections, the vertical sections are vertically arranged on the pressure box base support (1), the horizontal sections are spaced from the upper end of the pressure reducing ring (3) by a certain distance, and a first limiting hole (201) and a second limiting hole (202) are respectively formed in the horizontal sections and the vertical sections;
the number of the fixed support arms (4) is three, and the fixed support arms (4) are provided with fixing holes (401) for installing expansion bolts;
the length of the fixed support arm (4) is 28-32 cm;
the tenon is arranged at one end of the fixed support arm (4), and the mortise matched with the tenon is arranged on the pressure box base (1).
2. A pressure cell fixture for measuring petrographic surrounding rock-lining contact pressure as defined in claim 1 wherein: the length of the fixed support arm (4) is 30 cm.
3. A pressure cell fixture for measuring petrographic surrounding rock-lining contact pressure as defined in claim 1 wherein: the pressure box seat support (1) is made of steel materials.
4. A pressure cell fixture for measuring petrographic surrounding rock-lining contact pressure as defined in claim 1 wherein: the pressure reducing ring (3) is made of honeycomb foam plastic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610917582.9A CN106370335B (en) | 2016-10-21 | 2016-10-21 | Pressure box fixing device for measuring rock surrounding rock-lining contact pressure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610917582.9A CN106370335B (en) | 2016-10-21 | 2016-10-21 | Pressure box fixing device for measuring rock surrounding rock-lining contact pressure |
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| CN106370335A CN106370335A (en) | 2017-02-01 |
| CN106370335B true CN106370335B (en) | 2022-06-28 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108930540B (en) * | 2017-05-27 | 2024-02-13 | 中冶长天国际工程有限责任公司 | Tunnel primary support-secondary lining contact pressure measuring device and embedding method thereof |
| CN107462354A (en) * | 2017-07-17 | 2017-12-12 | 山东中宏路桥建设有限公司 | Pressure from surrounding rock monitoring device |
| CN109707448B (en) * | 2019-02-20 | 2024-05-28 | 西安科技大学 | Auxiliary equipment for installing soil pressure box |
| CN114324142B (en) * | 2021-11-26 | 2024-03-26 | 北京中煤矿山工程有限公司 | Contact surface friction force measuring device |
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| CN106370335A (en) | 2017-02-01 |
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Application publication date: 20170201 Assignee: Henan mengsen Construction Engineering Service Co.,Ltd. Assignor: LUOYANG INSTITUTE OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980031801 Denomination of invention: A pressure box fixing device for measuring the contact pressure between rock surrounding rock and lining Granted publication date: 20220628 License type: Common License Record date: 20230203 Application publication date: 20170201 Assignee: Henan mengsen Construction Engineering Service Co.,Ltd. Assignor: LUOYANG INSTITUTE OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980031769 Denomination of invention: A pressure box fixing device for measuring the contact pressure between rock surrounding rock and lining Granted publication date: 20220628 License type: Common License Record date: 20230203 |
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