CN205654365U - Bury fiber grating's tunnel lock foot anchor pipe atress characteristic testing arrangement underground - Google Patents
Bury fiber grating's tunnel lock foot anchor pipe atress characteristic testing arrangement underground Download PDFInfo
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- CN205654365U CN205654365U CN201620451950.0U CN201620451950U CN205654365U CN 205654365 U CN205654365 U CN 205654365U CN 201620451950 U CN201620451950 U CN 201620451950U CN 205654365 U CN205654365 U CN 205654365U
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- foot anchor
- lock foot
- anchor tube
- elongated slot
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Abstract
The utility model relates to a testing arrangement of tunnel lock foot anchor pipe atress characteristic, concretely relates to bury fiber grating's tunnel lock foot anchor pipe atress characteristic testing arrangement underground. The stress and the moment of flexure of locking foot anchor pipe in the actual work progress in test tunnel that it can be accurate. The technical scheme of the utility model including lock foot anchor pipe body, the one end of lock foot anchor pipe be provided with the conical head, the pipe shaft of lock foot anchor pipe on be provided with 4 symmetrical elongated slots along pipe length direction, the axis of 4 elongated slots parallels, the both ends of every elongated slot are provided with round hole no. 1 and round hole no. 2, wear to be equipped with the bare fibre through round hole no. 1 and round hole no. 2 in every elongated slot, the both ends of bare fibre stretch out in lock foot anchor outside of tubes, be provided with a plurality of grating on the bare fibre in the elongated slot, the outer bare fibre of elongated slot carries out the armor and forms optical cable no. 1 and optical cable no. 2, optical cable no. 1 or optical cable no. 2 be connected with fiber grating demodulation appearance.
Description
Technical field
This utility model relates to the test device of a kind of tunnel lock foot anchor tube mechanical characteristic, is specifically related to a kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground.
Background technology
Along with the development of China's tunnel construction, length of tunnel is repaiied longer and longer, and scale is increasing, and the geological hydrology environment run into also becomes increasingly complex, and the probability of Soft Rock Tunnel also can increase.Support System in Soft Rock Tunnels deformation is big, and intensity is low, and self-stable ability is poor, and sedimentation difficulty controls, and deals with improperly and is easy to cause the accidents such as landslide.In order to ensure construction safety, used many kinds of measures to reinforce country rock, lock foot anchor tube is as a kind of reinforcement measure therein, it is mainly used in IV, V level surrounding rock tunnel of partial excavation method or benching tunnelling method excavation, topping bar after just an excavation completes, in order to prevent from getting out of a predicament or an embarrassing situation, excavation causes preliminary bracing to sink, often sets by certain angle in get out of a predicament or an embarrassing situation excavation forward position tunnel arch foot or corner and locks foot anchor tube, and its termination and steelframe firm welding are become an entirety, play its carrying effect.Owing to its construction is simple, effect is notable, economical and practical, it is widely used in Support System in Soft Rock Tunnels.But having the research shutting the foot anchor tube mechanism of action and mechanical characteristic the most deep enough comprehensively, the data described about its loading characteristic is also little, is the most all obtained by theory analysis and numerical analysis, and its result exists certain deviation with lock foot anchor tube actual loading.
Utility model content
The purpose of this utility model is to provide a kind of tunnel burying fiber grating underground lock foot anchor tube mechanical characteristic test device, and it can lock stress and the moment of flexure of foot anchor tube accurately during testing tunnel practice of construction.
For solving the problem that prior art exists, the technical solution of the utility model is: a kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground, including lock foot anchor tube body, one end of described lock foot anchor tube is provided with conehead, it is characterized in that: on the pipe shaft of described lock foot anchor tube, be provided with symmetrical 4 elongated slot along length of tube direction, the axis of 4 elongated slots is parallel, the two ends of each elongated slot are provided with circular hole one and circular hole two, it is equipped with bare fibre by circular hole one and circular hole two in each elongated slot, the two ends of described bare fibre stretch out in outside lock foot anchor tube, several gratings it are provided with on bare fibre in elongated slot, bare fibre outside elongated slot carries out armouring and forms optical cable one and optical cable two, described optical cable one or optical cable two are connected with fiber Bragg grating (FBG) demodulator.
The position that spacing distance between each adjacent gratings respectively tests section according to lock foot anchor tube is arranged.
Space flight glue and marine glue is scribbled successively on bare fibre in elongated slot.
It is arranged with Loose tube on bare fibre in elongated slot.
Compared with prior art, advantage of the present utility model is as follows:
1, this utility model is the physical characteristic locking foot anchor tube based on fiber grating sensing technology and tunnel, proposes the device of testing tunnel lock foot anchor tube mechanical characteristic targetedly；
2, utilize this test device both can record lock foot anchor tube stress, moment of flexure along the distribution character of pipe depth direction, action principle and the mechanical mechanism of lock foot anchor tube can be disclosed again；
3, for compared to other test devices, the lock foot anchor tube mechanical characteristic test device of laying optical fiber grating, the reliability and stability of test data are strong, drift is little, it is possible to achieve the long term monitoring of lock foot anchor tube mechanical characteristic；
4, this test device is to utilize to inscribe multiple grating on a bare fibre, and is encapsulated in anchor tube pipe shaft groove, it is possible to achieve distributed measurement, and is susceptible to electromagnetic interference, durability during this measurement device by force, is more suitable for job site.
Accompanying drawing explanation
The structural representation of Fig. 1 this utility model device；
Fig. 2 this utility model fiber grating test philosophy schematic diagram
Fig. 3 this utility model fiber grating each point layout floor map；
Fig. 4 this utility model test device sectional schematic diagram；
The conehead schematic diagram that Fig. 5 this utility model lock foot anchor tube afterbody is installed；
Description of reference numerals: 1 lock foot anchor tube body, 2 circular holes one, 3 elongated slots, 4 circular holes two, 5 coneheads, 6 bare fibres, 7 fiber Bragg grating (FBG) demodulators, 8 optical cables one, 9 gratings, 10 optical cables two.
Detailed description of the invention
Combine accompanying drawing below by embodiment the design is described in detail:
See Fig. 1 Fig. 5: a kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground, including lock foot anchor tube body 1, one end of described lock foot anchor tube 1 is provided with conehead 5, it is provided with symmetrical 4 elongated slot 3 along length of tube direction on the pipe shaft of described lock foot anchor tube 1, the axis of 4 elongated slots 3 is parallel, the two ends of each elongated slot 3 are provided with circular hole 1 and circular hole 24, it is equipped with bare fibre 6 by circular hole 1 and circular hole 24 in each elongated slot, the two ends of described bare fibre 6 stretch out in outside lock foot anchor tube 1, several gratings 9 it are provided with on bare fibre in elongated slot, bare fibre 6 outside elongated slot carries out armouring and forms optical cable 1 and optical cable 2 10, described optical cable 1 or optical cable 2 10 are connected with fiber Bragg grating (FBG) demodulator 7.
The position that spacing distance between each adjacent gratings 9 respectively tests section according to lock foot anchor tube is arranged.
Space flight glue and marine glue is scribbled successively on bare fibre 6 in elongated slot.
It is arranged with Loose tube on bare fibre 6 in elongated slot.
The described a length of 6cm of conehead 5.
When measuring the strain of anchor tube pipe shaft different cross section, can carry out laying measuring point as stated above at different sections, as shown in Figure 2 and Figure 3.
What this utility model made concretely comprises the following steps:
(1) location: lock foot anchor tube before kerve first with scriber in the top in its cross section, bottom, leftmost, four positions of rightmost are along the length direction line of lock foot anchor tube.
(2) kerve: pipe shaft cutting direction should be consistent with line direction, first by lock foot anchor tube frame in the operating platform of milling machine, and lock foot anchor tube is securely fixed, then utilize milling cutter along line, from the beginning of away from the lock a certain position of foot anchor tube port, at anchor tube pipe shaft along the cutting of length of tube line of direction the widest 1mm, the sulculus of deep 1mm.The length of sulculus determines according to the test scope of anchor tube, and the most in the same way at its excess-three orientation kerve of pipe shaft, the line position deviation of kerve controls within ± 0.1mm.
(3) boring: on lock foot anchor tube pipe shaft, lower opening and hole, left and right use the form of interlaced arrangement to reduce the impact on lock foot anchor tube intensity of the pipe shaft aperture.For upper lower opening, the most respectively at upper and lower kerve two ends, bore squeezing into of inclination with impact, in order to the introducing lock foot anchor tube that armored optical cable can smooth is internal and does not bends；Hole, left and right and upper lower opening are staggered 1cm, lay respectively at the two ends of left and right kerve, and the diameter of boring is consistent with the diameter of armored optical cable.
(4) polishing is cleaned: first with polisher, lock foot anchor tube pipe shaft kerve is carried out sanding and polishing process.Then with sand paper, the kerve at measuring point is polished again, make the smooth surface at measuring point smooth.Finally with being moistened with the rayon balls of anhydrous alcohol or acetone to carrying out wiping cleaning near tube wall kerve and kerve, owing to fiber grating has the characteristic of hypersensitization, so kerve surface must be cleaned repeatedly with the rayon balls being moistened with anhydrous alcohol or acetone, remove rust and the greasy dirt on kerve surface.
(5) grid carved by optical fiber: owing to the technology of UV laser exposure method is the most ripe, and make the simplest.Therefore this test exposes optical fiber mainly by Ultra-Violet Laser through vibration amplitude mask plate, makes the refractive index of optical fiber produce periodically distribution, forms fiber grating.
(6) fiber grating prestretched: use high-accuracy manual translation platform, by the way of utilizing micrometer driving, grating is carried out high-precision manually adjusting and make it reach intended centre wavelength at encapsulated phase.
(7) optical fiber Bragg grating encapsulation: the encapsulation of fiber grating is most important link in whole dynamometry anchor tube manufacturing process.First, the optical fiber being carved with grating is placed in the groove of lock foot anchor tube pipe shaft the top, the position in optical fiber grid region should be with the position one_to_one corresponding at lock foot anchor tube test section place, and should ensure that the direction of grating is parallel with the axial direction of anchor tube, then, after the fiber grating in the groove of lock foot anchor tube pipe shaft the top is in place, first in the groove at place, a grid region, inject space flight glue with syringe, and the glue in groove is carried out suitable heating, drying, its degree of compaction is increased with the formation of the middle bubble in minimizing glue, after 12 hours, glue is fully cured, the most one by one other grid regions in the groove of pipe shaft the top are fixed.Finally, to fiber grating place groove marine glue applied over, and Loose tube on the set of optical fiber two ends, then put armored optical cable in case optical fiber fractures.Pipe shaft bottom, leftmost, the fiber grating of rightmost are packaged the most successively.
(8) threading: after optical fiber Bragg grating encapsulation, need to draw and focus on anchor tube termination by armored optical cable from boring along tube wall and carry out arranging numbering.Near the boring of lock foot anchor tube port, directly armored optical cable can be introduced anchor tube inside from tube wall drilling by thin tied silk and draw from anchor tube port.For the boring away from lock foot anchor tube port, can not directly connect by thin tied silk, armored optical cable is passed by available thin tied silk from the other end of anchor tube, then armored optical cable is fixed on steel wire, and with steel wire by armored optical cable from anchor tube bottom traction to anchor tube port, crest is monitored constantly when through anchor tube by armored optical cable with fiber Bragg grating (FBG) demodulator, prevents the too small demodulation affecting wavelength of optical cable crooked process radius.Finally, all connect FC/APC joint at armored optical cable two ends, form redundancy, and carry out arranging numbering.
(9) protection: lock foot anchor tube test local environment is complicated, and its construction belongs to extensive style operation, to be therefore again protected by fiber grating and armored optical cable.For fiber grating protection, use anchor tube pipe shaft be wound around metal tape protect；Protection for armored optical cable; due in work progress at the scene; lock foot anchor tube port should weld with steelframe; in order to prevent, welding temperature is too high causes damage to armored optical cable; so first optical cable being wound with Teflon high temperature gummed tape; it is wound with Musa basjoo Sieb. Et Zucc. band heat insulation foam again, and prevents armored optical cable from contacting anchor tube inwall at anchor tube port filling asbestos insulation cloth.
(10) conehead is installed: because lock foot anchor tube is big compared with long and with country rock contact surface, therefore when installing anchor tube, frictional resistance between country rock and anchor tube is bigger, therefore the conehead of one long 6cm is installed before installing lock foot anchor tube, in order to make anchor tube can preferably insert pre-drilled Kong Weizhong at its afterbody.
(11) fiber Bragg grating (FBG) demodulator is connected: the optical cable stretched out from lock foot anchor tube port is connected to fiber Bragg grating (FBG) demodulator, for testing the variable quantity of pipe shaft wavelength.
Claims (4)
- null1. the tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground，Including lock foot anchor tube body (1)，One end of described lock foot anchor tube (1) is provided with conehead (5)，It is characterized in that: on the pipe shaft of described lock foot anchor tube (1), be provided with symmetrical 4 elongated slot (3) along length of tube direction，The axis of 4 elongated slots (3) is parallel，The two ends of each elongated slot (3) are provided with circular hole one (2) and circular hole two (4)，It is equipped with bare fibre (6) by circular hole one (2) and circular hole two (4) in each elongated slot，The two ends of described bare fibre (6) stretch out in lock foot anchor tube (1) outward，Several gratings (9) it are provided with on bare fibre in elongated slot，Bare fibre (6) outside elongated slot carries out armouring and forms optical cable one (8) and optical cable two (10)，Described optical cable one (8) or optical cable two (10) are connected with fiber Bragg grating (FBG) demodulator (7).
- A kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground the most according to claim 1, it is characterised in that: the position that the spacing distance between each adjacent gratings (9) respectively tests section according to lock foot anchor tube is arranged.
- A kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground the most according to claim 1 and 2, it is characterised in that: scribble space flight glue and marine glue successively on the bare fibre (6) in elongated slot.
- A kind of tunnel lock foot anchor tube mechanical characteristic test device burying fiber grating underground the most according to claim 3, it is characterised in that: it is arranged with Loose tube on the bare fibre (6) in elongated slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620451950.0U CN205654365U (en) | 2016-05-18 | 2016-05-18 | Bury fiber grating's tunnel lock foot anchor pipe atress characteristic testing arrangement underground |
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| CN201620451950.0U CN205654365U (en) | 2016-05-18 | 2016-05-18 | Bury fiber grating's tunnel lock foot anchor pipe atress characteristic testing arrangement underground |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087029A (en) * | 2017-11-16 | 2018-05-29 | 长安大学 | A kind of measuring point guard method of fiber grating force-measuring locking foot anchor tube |
| CN110455447A (en) * | 2019-08-09 | 2019-11-15 | 浙江华东工程安全技术有限公司 | The curved bolt stress long term monitoring device in section of jurisdiction and installation method based on fiber grating |
| CN113107565A (en) * | 2021-03-30 | 2021-07-13 | 悉地（苏州）勘察设计顾问有限公司 | Internal force measuring device and method for locking anchor pipe of tunnel supporting system |
| CN113865498A (en) * | 2021-09-07 | 2021-12-31 | 天津大学 | Deep water pipeline damage monitoring method based on fiber bragg grating sensing |
-
2016
- 2016-05-18 CN CN201620451950.0U patent/CN205654365U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087029A (en) * | 2017-11-16 | 2018-05-29 | 长安大学 | A kind of measuring point guard method of fiber grating force-measuring locking foot anchor tube |
| CN108087029B (en) * | 2017-11-16 | 2019-09-20 | 长安大学 | A kind of measuring point guard method of fiber grating force-measuring locking foot anchor tube |
| CN110455447A (en) * | 2019-08-09 | 2019-11-15 | 浙江华东工程安全技术有限公司 | The curved bolt stress long term monitoring device in section of jurisdiction and installation method based on fiber grating |
| CN113107565A (en) * | 2021-03-30 | 2021-07-13 | 悉地（苏州）勘察设计顾问有限公司 | Internal force measuring device and method for locking anchor pipe of tunnel supporting system |
| CN113107565B (en) * | 2021-03-30 | 2022-08-12 | 悉地（苏州）勘察设计顾问有限公司 | Internal force measuring device and method for locking anchor pipe of tunnel supporting system |
| CN113865498A (en) * | 2021-09-07 | 2021-12-31 | 天津大学 | Deep water pipeline damage monitoring method based on fiber bragg grating sensing |
| CN113865498B (en) * | 2021-09-07 | 2023-09-05 | 天津大学 | Deepwater pipeline damage monitoring method based on fiber bragg grating sensing |
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