CN103743376A - Replaceable embedded vibrating-string strain gauge installation method - Google Patents
Replaceable embedded vibrating-string strain gauge installation method Download PDFInfo
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- CN103743376A CN103743376A CN201310746902.5A CN201310746902A CN103743376A CN 103743376 A CN103743376 A CN 103743376A CN 201310746902 A CN201310746902 A CN 201310746902A CN 103743376 A CN103743376 A CN 103743376A
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Abstract
The invention relates to a replaceable embedded vibrating-string strain gauge installation method. A vibrating-string strain gauge can be used for measuring the strain variation of a top plate, a soleplate and a web of a beam; the vibrating-string strain gauge is in a dumbbell shape, the middle part of the vibrating-string strain gauge is in a cylindrical shape, two ends of the cylindrical middle part are respectively and integrally connected with a metal wafer, the diameter of each metal wafer is D, and the diameter D of each metal wafer is greater than the diameter d of the cylinder. A working mechanism for realizing the replaceable embedded vibrating-string strain gauge is as follows: when the strain gauge loses effectiveness, a sealing cover plate is opened, solvent of epoxy resin binder is injected to two ends of the strain gauge, after the strain gauge is immersed for a period of time, the binder between a stainless steel plate and a steel plate on each end of the strain gauge is dissolved, and the strain gauge is taken out; a novel strain gauge is connected with a conducting wire, and after the solvent is completely volatized, the steel plates on two ends of the strain gauge are coated with epoxy resin, and the strain gauge stretches into reserved holes.
Description
Technical field
What the present invention relates to is a kind of installation of sensors of technical field of civil engineering, is specifically related to a kind of vibrating string type strain transducer installation method.
Background technology
Vibrating string extensometer has simple in structure, reliable operation, output signal is the frequency signal of standard, without advantages such as energisings always, has now been widely used in the monitoring of the reinforced concrete structure key position force-bearing situations such as large bridge, dam, tunnel, Important building.But vibrating string extensometer life-span in experimental situation can reach about 25 years according to the literature, and relatively not long because of the Applicative time of vibrating string extensometer in engineering, in reality, its life-span is still unknown.Generally can reach centuries even decades the serviceable life of reinforced concrete structure.And flush type vibration shape formula strainometer has certain survival rate after installing, thereby there is the problem of changing vibrating string extensometer in structure monitoring process.At present, vibrating string extensometer is of a great variety, but finds no removable flush type vibratory strain ga(u)ge.
Summary of the invention
The object of the present invention is to provide a kind of removable flush type vibratory strain ga(u)ge installation method, strainometer aging or lost efficacy after it is changed, can meet the demand of long term monitoring, be applicable to reinforcing bar and concrete in structure simultaneously.
Technical scheme of the present invention is:
A removable flush type vibratory strain ga(u)ge installation method, vibrating string extensometer can be used for measuring the STRESS VARIATION of top board, base plate and the web of beam; It is shaped as dumbbell shape, its structure is that center section is cylindrical, cylindrical two ends are connected with metal disk, the diameter of metal disk is D, the diameter D of metal disk is greater than cylindrical diameter d;
Concrete installation steps are:
One, first selected vibrating string extensometer model, determines strainometer length L, two ends metal disk diameter D;
Two, determine strain tested point, determine top board or base plate position, measure vibrating string extensometer apart from concrete outside surface distance H;
Three, preformed hole is set: according to nearby principle, select vibrating string extensometer exit position, remain in advance installing the preformed hole of vibrating string extensometer at strain tested point, preformed hole is of a size of: long L+10mm, wide D+2mm, dark H+2mm;
Four, wear wired pipe: first determine terminal box position, according to the smooth principle of wire, plan and determine to connect wire line, wire is penetrated in the PPR pipe that diameter is 3 ~ 5 times of diameters of wire together with permanance wire rod, in pipe, inject lubricating oil, along designed lines, install;
Five, making and pre-buried stainless steel substrates: at each pre-buried stainless steel substrates of two bottom sides of preformed hole, the square that the length of side of stainless steel substrates is D+1cm, thickness is 0.5 ~ 1cm; Pre-buriedly being divided into two kinds of situations 1. if measure concrete stress, two stainless steel substrates being embedded in respectively to the both sides that vibrating string extensometer position is installed, is to guarantee stainless steel substrates and concrete reliable connection, at the periphery of stainless steel substrates, welds some stiffeners; When pre-buried, stiffener is embedded in concrete; If 2. vibrating string extensometer is for measuring concrete reinforcement stress, stainless steel substrates and reinforcing bar to be measured are reliably welded;
Six, pickup groove is set: the present invention adopts cover plate for sealing preformed hole, cover plate is shaped as with preformed hole top shape suitable, the length of cover plate and the wide preformed hole that is all greater than; The surrounding periphery of cover plate offers for wearing the through hole of bolt, at the reserved circle pickup groove in the periphery outside of preformed hole, is embedded with nut in pickup groove, and nut quantity equates with number of openings;
Seven, connect wire: after casting concrete, strainometer wire is reliably connected with pre-buried wire, and does insulation processing;
Eight, vibrating string extensometer is installed: vibrating string extensometer is placed between the stainless steel substrates of the left and right sides, and is coated with and spreads appropriate epoxyn on the metal disk at stainless steel substrates and vibrating string extensometer two ends;
Nine, fixing vibrating string extensometer: at the bottom of adopting vibrating string extensometer erecting tools that vibrating string extensometer is put into preformed hole, in conjunction with taseometer readout instrument, strainometer erecting tools outwards struts the metal disk at two ends, the metal disk of both sides is tightly pressed on the stainless steel substrates of a corresponding side, give to fix after strainometer initial reading, until stainless steel substrates and metal disk fixed after, take off strainometer erecting tools; Strainometer erecting tools is tong-like, and upside two ends are that U-shaped and can relatively rotating is opened, and the metal disk that can block vibrating string extensometer two ends rotates and backwardly struts metal disk outward, and strainometer erecting tools upside two ends are fixed;
Ten, sealing: install cover plate with bolt, be provided with the gasket seal for sealing between cover plate and pickup groove, if preformed hole is positioned at base plate place, need not process; If be positioned at top board position, owing to also needing on the cover board square casting concrete to mat formation, thus need on the cover board side to place the thin corrosion resistant plate of isolation, so that the later stage is changed;
11, connect terminal box: after above-mentioned testing element is embedded in concrete, reserves the shield type connecting line of sufficient length to bridge side or to bridge pier Dun Ding, and test terminal box is set;
12, change: if the vibrating string extensometer of top board position is aging, first cutting cover plate top is concrete pavement, then rotating bolt is opened cover plate, take out cover plate, interim cover plate is installed, on interim cover plate, inlet opening and gas outlet are installed, injection can dissolved epoxy class bonding agent solvent, bonding agent after immersion a period of time between solubilized stainless steel substrates and strainometer end steel disk, take out old vibrating string extensometer, then with acetone, clean preformed hole, simultaneously, if harness damage is answered restringing, then connect wire and new strainometer, smear appropriate epoxyn on the metal disk of new strainometer two ends after, repeat multiple step 1 to ten one, if change the vibrating string extensometer of base plate position, use syringe class instrument solvent to be delivered to the epoxy resin place at metal disk and stainless steel substrates place, all the other steps are identical with the process of the vibrating string extensometer of replacing top board position.
Wherein, in the 5th step, when when surveying concrete stress, the deformed bar that is 12mm in 4 angle points of stainless steel substrates and center weld diameter, reinforcing bar length is 10cm.
In the 8th step, epoxyn adopts epoxy resin.
Described strainometer erecting tools comprises two relatively turnable connecting rods, the top of two connecting rods is all connected with the bayonet socket of U-shaped, the center line of the bayonet socket of U-shaped overlaps, rotate at the middle part of two connecting rods, the bottom of connecting rod is respectively connected with a nut, between two nuts, be connected with screw rod, the hand of spiral of the screw rod left and right sides is contrary, and screw rod middle part is vertically fixedly connected with adjuster bar.
Strainometer erecting tools comprises two relatively turnable connecting rods, web joint, two connecting rods are V-arrangement and symmetry is rotatably connected on web joint, the top of two connecting rods is all connected with the bayonet socket of U-shaped, the center line of U-shaped bayonet socket overlaps, the bottom of connecting rod is respectively connected with a nut, between two nuts, be connected with screw rod, the hand of spiral of the screw rod left and right sides is contrary, and screw rod middle part is vertically fixedly connected with adjuster bar.
Cylinder diameter in the middle of the openings of sizes of U-shaped bayonet socket and vibrating string extensometer is suitable.
The working mechanism that the present invention realizes removable flush type vibratory strain ga(u)ge is: after strainometer lost efficacy, open seal cover board, to strainometer two ends, inject the solvent of epoxyn, bonding agent after immersion a period of time between the steel disc at stainless steel substrates and strainometer two ends is dissolved, takes out old strainometer; Connect new strainometer and wire, after solvent evaporates is complete, after being smeared to epoxy resin, strainometer two ends steel disc stretches in preformed hole, arrive after assigned address, adopt erecting tools extruding two ends steel disc, make it with concrete in stainless steel substrates combine closely, after solidifying, exit erecting tools, again cover seal pad.Because of stainless steel substrates, self stability is good, without replacing, if harness damage can be connected new wire when changing strainometer with old wire, in terminal box position, pull out old wire, taken new wire out of simultaneously, and then realize wire replacing, if fracture in the middle of old wire can be enabled permanance wire rod new wire is guided to terminal box position.After strainometer after replacing loses efficacy, can again according to above-mentioned flow process, change, thereby guarantee the long-term continuity of strain monitoring.
Compared with prior art, advantage of the present invention is:
1, can realize flush type vibrating string extensometer is changed, implementation structure is monitored in whole life cycle internal stress.
2, the own small volume of vibrating string extensometer, thereby preformed hole is less, little to structure influence, by seal pad, do not affect structure durability;
3, replacing strainometer and wire are all convenient and reliable, and without custom-made strainometer, cheap.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A cut-open view of Fig. 1;
Fig. 3 is the B-B cut-open view of Fig. 1;
Fig. 4 is covering plate structure schematic diagram;
Fig. 5 is the structural representation of strainometer erecting tools;
Fig. 6 is the left view of Fig. 5;
Fig. 7 is the schematic diagram that strainometer erecting tools is installed vibrating string type strain timing.
Embodiment
As shown in Figure 1, installation method of the present invention for be vibrating string extensometer, vibrating string extensometer can be used for measuring the STRESS VARIATION of top board, base plate and the web of beam.It is shaped as dumbbell shape, its structure is that centre is cylindrical, cylindrical two ends are connected with metal disk 10, the diameter of metal disk 10 is D, the diameter D of metal disk 10 is greater than cylindrical diameter d.
Concrete installation steps are:
One, first selected vibrating string extensometer model, determines strainometer length L, two ends metal disk 10 diameter D;
Two, determine strain tested point, determine top board or base plate position, measure vibrating string extensometer apart from concrete outside surface distance H;
Three, preformed hole is set: as shown in Figure 1, according to nearby principle, select vibrating string extensometer exit position, at strain tested point, remain in advance installing the preformed hole 2 of vibrating string extensometer 1, preformed hole 2 sizes: long L+10mm, wide D+2mm, dark H+2mm, each distance of increase is for more convenient installation;
Four, wear wired pipe: first will determine terminal box 19 positions, according to the smooth principle of wire, plan and determine to connect wire line, wire 9 is penetrated in the PPR pipe that diameter is 3 ~ 5 times of diameters of wire together with permanance wire rod, in pipe, inject lubricating oil, along designed lines, install;
Five, making and pre-buried stainless steel substrates: as shown in Figure 2,3, at each pre-buried stainless steel substrates 3 of two bottom sides of preformed hole 2, the square that the length of side of stainless steel substrates 3 is D+1cm, thickness is 0.5 ~ 1cm; Pre-buriedly be divided into two kinds of situations 1. if measure concrete stress, the deformed bar that is 12mm in 4 angle points and the center weld diameter of stainless steel substrates, reinforcing bar length is 10cm; Two stainless steel substrates 3 are embedded in respectively to the both sides that vibrating string extensometer 1 position is installed, for guaranteeing stainless steel substrates 3 and concrete reliable connection, at the some stiffeners 4 of periphery welding of stainless steel substrates 3; When pre-buried, stiffener 4 is embedded in concrete; If 2. vibrating string extensometer 1 is for measuring concrete reinforcement stress, stainless steel substrates 3 and reinforcing bar to be measured are reliably welded;
Six, pickup groove 5 is set: because need preformed hole 2 to seal, so the present invention adopts cover plate for sealing, as shown in Figure 4, cover plate 6 is shaped as with preformed hole 2 top shape suitable, the length of cover plate 6 and the wide preformed hole 2 that is all greater than after installing.The present embodiment cover plate 6 is rectangle, and the surrounding periphery of cover plate 6 offers for wearing the through hole 7 of bolt, in the periphery outside of preformed hole 2, is reserved with a circle pickup groove 5, is embedded with nut 8 in pickup groove 5, and nut 8 quantity equate with number of openings;
Seven, connect wire 9: after casting concrete, strainometer wire is reliably connected with pre-buried wire 9, and does insulation processing;
Eight, vibrating string extensometer is installed: vibrating string extensometer 1 is placed between the stainless steel substrates 3 of the left and right sides, and be coated with and spread appropriate epoxyn on the metal disk 10 at stainless steel substrates 3 and vibrating string extensometer two ends, the present embodiment adopts epoxy resin;
Nine, fixing vibrating string extensometer: as shown in Figure 7, adopt strainometer erecting tools 11 that vibrating string extensometer 1 is put into 2 ends of preformed hole, in conjunction with taseometer readout instrument, strainometer erecting tools 11 outwards struts the metal disk at two ends 10, the metal disk 10 of both sides is tightly pressed on the stainless steel substrates 3 of a corresponding side, give after strainometer initial reading fixing, until stainless steel substrates 3 and metal disk 10 fixed after, take off strainometer erecting tools 11; Strainometer erecting tools 11 is tong-like, and upside two ends are that U-shaped and can relatively rotating is opened, and the metal disk 10 that can block vibrating string extensometer 1 two ends rotates and backwardly struts metal disk 10 outward, and strainometer erecting tools 11 maintains static;
1, as shown in Figure 5,6, strainometer erecting tools 11 comprises web joint 15 and two relatively turnable connecting rods 13, two connecting rods 13 are V-arrangement and symmetry is rotatably connected on web joint 15, the top of two connecting rods 13 is all connected with the bayonet socket 14 of U-shaped, the center line of U-shaped bayonet socket 14 overlaps, cylinder diameter in the middle of the openings of sizes of U-shaped bayonet socket and vibrating string extensometer 1 is suitable, and in the present embodiment, U-shaped bayonet socket size equals cylinder diameter d.
The bottom of connecting rod 13 is respectively connected with a nut 16, between two nuts 16, be connected with screw rod 17, the hand of spiral of screw rod 17 left and right sides is contrary, and screw rod 17 middle parts are vertically fixedly connected with adjuster bar 18, and rotary regulating lever 18 just can make two connecting rods 13 relatively outwards open or inwardly fasten.The length of connecting rod 13 and web joint 15 is less than the length of connecting rod 13 the latter halfs, could form the effective arm of force like this.
2, strainometer erecting tools 11 comprises two relatively turnable connecting rods, the top of two connecting rods is all connected with the bayonet socket 14 of U-shaped, the center line of the bayonet socket 14 of U-shaped overlaps, rotate at the middle part of two connecting rods 13, the bottom of connecting rod is respectively connected with a nut, between two nuts, be connected with screw rod, the hand of spiral of the screw rod left and right sides is contrary, and screw rod middle part is vertically fixedly connected with adjuster bar.Planform is similar to tool tong.
Ten, sealing: install cover plate 6 with bolt, be provided with the gasket seal 12 for sealing between cover plate 6 and pickup groove 5, and do suitably to process; If preformed hole 2 is positioned at base plate place, need not process; If be positioned at top board position, owing to also needing on the cover board square casting concrete to mat formation, thus need above cover plate 6, place the thin corrosion resistant plate of isolation, so that the later stage is changed;
11, connect terminal box: after above-mentioned testing element is embedded in concrete, reserves the shield type connecting line of sufficient length to bridge side or to bridge pier Dun Ding, and test terminal box is set; Durable material for terminal box (such as vinyon box) is protected;
12, change: if the vibrating string extensometer 1 of top board position is aging, first cutting cover plate 6 tops is concrete pavements, then rotating bolt is opened cover plate 6, take out cover plate 6, interim cover plate is installed, on interim cover plate, inlet opening and gas outlet are installed, injection can dissolved epoxy solvent, soak the epoxy resin of 10 of solubilized stainless steel substrates 3 and strainometer end steel disk after a period of time, take out old vibrating string extensometer 1, then with acetone, clean preformed hole 2, simultaneously, if harness damage is answered restringing 9, then connect wire 9 and new strainometer, smear appropriate epoxy resin on the metal disk of new strainometer two ends after, utilize strainometer erecting tools 11 to put into preformed hole 2 bottoms, in conjunction with taseometer readout instrument, use strainometer erecting tools 11 that metal disk 10 and stainless steel substrates 3 are compressed, give to fix after strainometer initial reading, epoxy solidifies backed off after random strainometer erecting tools 11, then gasket seal and cover plate are installed successively.If change the vibrating string extensometer of base plate position, need to use syringe class instrument solvent to be delivered to the epoxy resin place at metal disk 10 and stainless steel substrates 3 places, all the other steps are identical with the step of the vibrating string extensometer of replacing top board position.
Base plate position is installed identical with top board position installation process, only changes while taking out slightly variant.
Claims (6)
1. a removable flush type vibratory strain ga(u)ge installation method, is characterized in that: vibrating string extensometer can be used for measuring the STRESS VARIATION of top board, base plate and the web of beam; It is shaped as dumbbell shape, its structure is that center section is cylindrical, cylindrical two ends are connected with metal disk, the diameter of metal disk is D, the diameter D of metal disk is greater than cylindrical diameter d;
Concrete installation steps are:
First selected vibrating string extensometer model, determines strainometer length L, two ends metal disk diameter D;
Determine strain tested point, determine top board or base plate position, measure vibrating string extensometer apart from concrete outside surface distance H;
Preformed hole is set: according to nearby principle, select vibrating string extensometer exit position, remain in advance installing the preformed hole of vibrating string extensometer at strain tested point, preformed hole is of a size of: long L+10mm, wide D+2mm, dark H+2mm;
Wear wired pipe: first determine terminal box position, according to the smooth principle of wire, plan and determine to connect wire line, wire is penetrated in the PPR pipe that diameter is 3 ~ 5 times of diameters of wire together with permanance wire rod, in pipe, inject lubricating oil, along designed lines, install;
Make and pre-buried stainless steel substrates: at each pre-buried stainless steel substrates of two bottom sides of preformed hole, the square that the length of side of stainless steel substrates is D+1cm, thickness is 0.5 ~ 1cm; Pre-buriedly being divided into two kinds of situations 1. if measure concrete stress, two stainless steel substrates being embedded in respectively to the both sides that vibrating string extensometer position is installed, is to guarantee stainless steel substrates and concrete reliable connection, at the periphery of stainless steel substrates, welds some stiffeners; When pre-buried, stiffener is embedded in concrete; If 2. vibrating string extensometer is for measuring concrete reinforcement stress, stainless steel substrates and reinforcing bar to be measured are reliably welded;
Pickup groove is set: the present invention adopts cover plate for sealing preformed hole, cover plate is shaped as with preformed hole top shape suitable, the length of cover plate and the wide preformed hole that is all greater than; The surrounding periphery of cover plate offers for wearing the through hole of bolt, at the reserved circle pickup groove in the periphery outside of preformed hole, is embedded with nut in pickup groove, and nut quantity equates with number of openings;
Connect wire: after casting concrete, strainometer wire is reliably connected with pre-buried wire, and does insulation processing;
Vibrating string extensometer is installed: vibrating string extensometer is placed between the stainless steel substrates of the left and right sides, and is coated with and spreads appropriate epoxyn on the metal disk at stainless steel substrates and vibrating string extensometer two ends;
Fixing vibrating string extensometer: at the bottom of adopting vibrating string extensometer erecting tools that vibrating string extensometer is put into preformed hole, in conjunction with taseometer readout instrument, strainometer erecting tools outwards struts the metal disk at two ends, the metal disk of both sides is tightly pressed on the stainless steel substrates of a corresponding side, give to fix after strainometer initial reading, until stainless steel substrates and metal disk fixed after, take off strainometer erecting tools; Strainometer erecting tools is tong-like, and upside two ends are that U-shaped and can relatively rotating is opened, and the metal disk that can block vibrating string extensometer two ends rotates and backwardly struts metal disk outward, and strainometer erecting tools upside two ends are fixed;
Sealing: install cover plate with bolt, be provided with the gasket seal for sealing between cover plate and pickup groove, if preformed hole is positioned at base plate place, need not process; If be positioned at top board position, owing to also needing on the cover board square casting concrete to mat formation, thus need on the cover board side to place the thin corrosion resistant plate of isolation, so that the later stage is changed;
Connect terminal box: after above-mentioned testing element is embedded in concrete, reserves the shield type connecting line of sufficient length to bridge side or to bridge pier Dun Ding, and test terminal box is set;
Change: if the vibrating string extensometer of top board position is aging, first cutting cover plate top is concrete pavement, then rotating bolt is opened cover plate, take out cover plate, interim cover plate is installed, on interim cover plate, inlet opening and gas outlet are installed, injection can dissolved epoxy class bonding agent solvent, bonding agent after immersion a period of time between solubilized stainless steel substrates and strainometer end steel disk, take out old vibrating string extensometer, then with acetone, clean preformed hole, simultaneously, if harness damage is answered restringing, then connect wire and new strainometer, smear appropriate epoxyn on the metal disk of new strainometer two ends after, repeat multiple step 1 to ten one, if change the vibrating string extensometer of base plate position, use syringe class instrument solvent to be delivered to the epoxy resin place at metal disk and stainless steel substrates place, all the other steps are identical with the process of the vibrating string extensometer of replacing top board position.
2. removable flush type vibratory strain ga(u)ge installation method according to claim 1, it is characterized in that: wherein, in the 5th step, when when surveying concrete stress, the deformed bar that is 12mm in 4 angle points of stainless steel substrates and center weld diameter, reinforcing bar length is 10cm.
3. removable flush type vibratory strain ga(u)ge installation method according to claim 1 and 2, is characterized in that: in the 8th step, epoxyn adopts epoxy resin.
4. removable flush type vibratory strain ga(u)ge installation method according to claim 1 and 2, it is characterized in that: described strainometer erecting tools comprises two relatively turnable connecting rods, the top of two connecting rods is all connected with the bayonet socket of U-shaped, the center line of the bayonet socket of U-shaped overlaps, rotate at the middle part of two connecting rods, and the bottom of connecting rod is respectively connected with a nut, between two nuts, is connected with screw rod, the hand of spiral of the screw rod left and right sides is contrary, and screw rod middle part is vertically fixedly connected with adjuster bar.
5. removable flush type vibratory strain ga(u)ge installation method according to claim 1 and 2, it is characterized in that: strainometer erecting tools comprises two relatively turnable connecting rods, web joint, two connecting rods are V-arrangement and symmetry is rotatably connected on web joint, the top of two connecting rods is all connected with the bayonet socket of U-shaped, the center line of U-shaped bayonet socket overlaps, the bottom of connecting rod is respectively connected with a nut, between two nuts, be connected with screw rod, the hand of spiral of the screw rod left and right sides is contrary, and screw rod middle part is vertically fixedly connected with adjuster bar.
6. removable flush type vibratory strain ga(u)ge installation method according to claim 1 and 2, is characterized in that: the cylinder diameter in the middle of the openings of sizes of U-shaped bayonet socket and vibrating string extensometer is suitable.
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| CN108895996A (en) * | 2018-06-25 | 2018-11-27 | 长沙理工大学 | The mounting device of concrete surface strain gauge |
| CN112945424A (en) * | 2021-01-19 | 2021-06-11 | 南京工程学院 | Vibrating wire type surface strain gauge and use method thereof |
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| CN103743376B (en) | 2016-03-23 |
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