CN104895334A - Real-time pre-stress monitoring type clip anchoring tool and anchoring tool tension method thereof - Google Patents
Real-time pre-stress monitoring type clip anchoring tool and anchoring tool tension method thereof Download PDFInfo
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- CN104895334A CN104895334A CN201510330083.5A CN201510330083A CN104895334A CN 104895334 A CN104895334 A CN 104895334A CN 201510330083 A CN201510330083 A CN 201510330083A CN 104895334 A CN104895334 A CN 104895334A
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Abstract
The invention provides a real-time pre-stress monitoring type clip anchoring tool and an anchoring tool tension method thereof, relates to a clip anchoring tool and an anchor tool tension method, and aims at solving the problems of the exiting anchoring tool that the loss of the pre-stress anchoring tool is difficult to monitor on real time and the tension control stress of pre-stressed ribs cannot be accurately ensured. The device is that a regular octagonal groove is processed in the outer surface of an inner anchoring ring in the radial direction; a conductor hole channel is corresponding to the axial position of the regular octagonal groove; a monitoring instrument is connected with eight resistance straining sheets through connectors; eight resistance straining sheets are arranged on four side surfaces at intervals in the regular octagonal groove; two resistance straining sheets are arranged on each side surface provided with the resistance straining sheet. The method comprises the steps of 1, mounting the anchoring tool; 2, tensioning a jack; 3, repeating step 2 according to the display value of the real-time pressure monitoring instrument until reaching sigma con; 4, connecting the real-time stress monitoring instrument during using the structure, and operating according to the step 3. The device and the method are applied to the pre-stress monitoring and the tensioning of the pre-stressed ribs.
Description
Technical field
The present invention relates to a kind of prestressing force Real-Time Monitoring intermediate plate ground tackle and anchor method opened by ground tackle, belong to technical field of civil engineering.
Background technology
In tension of prestressed tendon construction and works military service process, predetermined functional performance is realized for making prestressed reinforced concrete construction, ensure safety and the applicability of prestressed reinforced concrete construction, the effective prestress of the presstressed reinforcing steel of answering control structure to arrange makes itself and design calculation result match.Because prestressed reinforced concrete construction will produce ground tackle and presstressed reinforcing steel retraction in tension of prestressed tendon process, the anchoring procedure of stretching end presstressed reinforcing steel is also the process that presstressed reinforcing steel retraction produces prestress anchoraging loss; Again because prestressed reinforced concrete construction makes it produce prestressing force long-term loss at the creep of concrete of Long-Time Service process and contraction, the stress relaxation of presstressed reinforcing steel under condition of high ground stress, namely the effective prestress of prestressed reinforced concrete construction in use in presstressed reinforcing steel reduces in time.But, existing prestressed reinforced concrete construction system only depends on corresponding anchor system and opens anchor to presstressed reinforcing steel, during stretch-draw, the control stress for prestressing of presstressed reinforcing steel often relies on the reading of stretch-draw instrument to mark, and the retraction of the ground tackle of anchoring procedure and presstressed reinforcing steel and often rely on calculating to determine on the impact of effective prestress; Especially in the normal use procedure of structure presstressed reinforcing steel effective prestress time with change, be also rely on calculating determine.This with corresponding codes and standards for foundation, the error between effective prestress calculated value and actual value is acceptable for conventional structure.Obviously, for great or important prestressed reinforced concrete construction thing, and the prestressed reinforced concrete construction component comparatively responsive to effective prestress change, only rely on the result of calculation of presstressed reinforcing steel loss of prestress, with the data supporting of change when there is no the stress of presstressed reinforcing steel, be difficult to the functional performance and and the safety that ensure prestressed reinforced concrete construction.
To sum up, existing ground tackle is difficult to the loss of Real-Time Monitoring prestressed anchor, cannot accurately ensure tension of prestressed tendon proof stress.
Summary of the invention
The present invention is difficult to the loss of Real-Time Monitoring prestressed anchor for solving existing ground tackle, there is the problem that accurately cannot ensure tension of prestressed tendon proof stress, and then provides a kind of prestressing force Real-Time Monitoring intermediate plate ground tackle and ground tackle thereof to open anchor method.
The present invention solves the problems of the technologies described above the technical scheme taked to be:
Device: prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention comprises outer nut, interior anchor ring, monitor, connector and eight resistance strain gages, described intermediate plate ground tackle also comprises wedge shape cone cylinder, described outer nut is octagon nut, outer nut is processed with wire duct, the external surface of interior anchor ring is processed with external screw thread along its length, one end of interior anchor ring is processed with wedged hole, the other end of interior anchor ring is processed with centre bore, wedged hole is coaxial with the centre bore of interior anchor ring and be communicated with and arrange, the small end of wedged hole is connected with the centre bore of interior anchor ring, the external surface of interior anchor ring is radially processed with octagon groove, wire duct is corresponding with the axial location of octagon groove, monitor is connected with eight resistance strain gages by connector, four sides alternate in octagon groove are provided with eight resistance strain gages, the each side being provided with resistance strain gage is provided with two resistance strain gages, wedge shape cone cylinder is fastened by two half cone-shaped intermediate plates and forms, each half cone-shaped intermediate plate along its length on be processed with clip groove, hold greatly on radially-outer surface near wedge shape cone cylinder and be processed with cannelure, wedge shape cone cylinder is arranged in wedged hole.
Method: the ground tackle of prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention is opened anchor method and realized by following steps:
Step one, anchorage installation: be sleeved on presstressed reinforcing steel by interior anchor ring, then bore tube plug by wedge shape and enter in wedged hole, then be connected with outer nut at connector position by monitor;
Step 2, stretch-draw jack: read registration in real time by monitor, σ to be achieved
contime, tighten bottom outer nut inwardly anchor ring, loosen jack, reading displayed device registration; As being less than σ
con, be again stretched to σ
con, and continue to tighten bottom outer nut inwardly anchor ring, loosen jack, read registration;
Wherein σ
confor tension of prestressed tendon proof stress, value is 0.4f
ptk≤ σ
con≤ 0.75f
ptk, f
ptkfor presstressed reinforcing steel ultimate strength standard value;
Step 3, show value by stress real-time monitor, repeat step 2, until reach σ
contill;
Step 4, between the prestressed reinforced concrete construction operating period, connect stress real-time monitor, operate by step 3.
The present invention compared with prior art has following beneficial effect:
The interior anchor ring external surface of prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention is processed with octagon groove, and be provided with foil gauge in octagon groove, foil gauge is connected with monitor with by connector, between the prestressed structure operating period can Real-Time Monitoring stretching end effective prestress value and by intermediate plate ground tackle of the present invention supplementary prestressed penalty values in time, effectively meet the strict needs controlling the concrete structure of loss of prestress and effective prestress, compared with there is larger loss of prestress with the presstressed reinforcing steel of existing conventional ground tackle anchoring, intermediate plate ground tackle of the present invention accurately can control the effective prestress set up in presstressed reinforcing steel, and supplement prestressed penalty values in time,
Ground tackle of the present invention open anchor method have an anchor precision high, prestressed penalty values can be supplemented in time, the advantage of easy construction.
Accompanying drawing explanation
Fig. 1 is the overall structure stereogram of prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention, Fig. 2 is the main sectional view of prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention, Fig. 3 is the stereogram of interior anchor ring 2 in the specific embodiment of the invention one, Fig. 4 is the stereogram of outer nut 1 in the specific embodiment of the invention one, and Fig. 5 is that anchor method using state schematic diagram opened by intermediate plate ground tackle of the present invention.
Detailed description of the invention
Detailed description of the invention one: as shown in Fig. 1 ~ 5, the prestressing force Real-Time Monitoring intermediate plate ground tackle of present embodiment comprises outer nut 1, interior anchor ring 2, monitor 7, connector 6 and eight resistance strain gages 5, it is characterized in that: described intermediate plate ground tackle also comprises wedge shape cone cylinder 3, described outer nut 1 is octagon nut, outer nut 1 is processed with wire duct 4, the external surface of interior anchor ring 2 is processed with external screw thread 2-1 along its length, one end of interior anchor ring 2 is processed with wedged hole 2-3, the other end of interior anchor ring 2 is processed with centre bore 2-4, wedged hole 2-3 is coaxial with the centre bore 2-4 of interior anchor ring 2 and be communicated with and arrange, the small end of wedged hole 2-3 is connected with the centre bore 2-4 of interior anchor ring 2, the external surface of interior anchor ring 2 is radially processed with octagon groove 2-2, wire duct 4 is corresponding with the axial location of octagon groove 2-2, monitor 7 is connected with eight resistance strain gages 5 by connector 6, four sides alternate in octagon groove are provided with eight resistance strain gages 5, the each side being provided with resistance strain gage 5 is provided with two resistance strain gages 5, wedge shape cone cylinder 3 is fastened by two half cone-shaped intermediate plate 3-1 and forms, each half cone-shaped intermediate plate 3-1 along its length on be processed with clip groove 3-2, cannelure 3-3 is processed with on wedge shape cone cylinder 3 greatly end radially-outer surface, wedge shape cone cylinder 3 is arranged in wedged hole 2-3.
Detailed description of the invention two: as shown in Figure 2, present embodiment is provided with two resistance strain gages 5 vertical setting mutually that each side of resistance strain gage 5 is arranged, and takes temperature self-compensation, is linked to be Hui Sitong full-bridge.Design like this, the sensitivity of electric bridge can be brought up to 2 (1+ μ) doubly, wherein μ is the poisson's ratio of ground tackle inner nut 2, and meanwhile, this connection form can also eliminate the addition bend impact because ground tackle produces because of load eccentricity.Other composition and annexation identical with detailed description of the invention one.
Poisson's ratio: in the limit of proportionality of material, the absolute value of the lateral strain caused by equally distributed longitudinal stress and the ratio of corresponding longitudinal strain.
Detailed description of the invention three: as shown in Figure 2, the axial location of present embodiment octagon groove 2-2 is corresponding with the small end axial location of wedged hole 2-3.Design like this, can avoid too much circumferentially weakening inner nut 2, can prevent again from bottom too close to, affect the holistic resistant behavior of ground tackle.Other composition and annexation identical with detailed description of the invention one or two.
Detailed description of the invention four: as shown in Figure 5, the ground tackle of the prestressing force Real-Time Monitoring intermediate plate ground tackle of present embodiment is opened anchor method and is realized by following steps:
Step one, anchorage installation: be sleeved on presstressed reinforcing steel 11 by interior anchor ring 2, then bore cylinder 3 and fill in wedged hole 2-3, then be connected with outer nut 1 at connector 6 place by monitor 7 by wedge shape;
Step 2, stretch-draw jack 12: read registration in real time by monitor 7, σ to be achieved
contime, tighten bottom outer nut 1 inwardly anchor ring 2, loosen jack 12, reading displayed device registration; As being less than σ
con, be again stretched to σ
con, and continue to tighten bottom outer nut 1 inwardly anchor ring 2, loosen jack 12, read registration;
Wherein σ
confor presstressed reinforcing steel 11 control stress for prestressing, value is 0.4f
ptk≤ σ
con≤ 0.75f
ptk, f
ptkfor presstressed reinforcing steel 11 ultimate strength standard value;
Step 3, show value by stress real-time monitor, repeat step 2, until reach σ
contill;
Step 4, between prestressed reinforced concrete construction 14 operating period, connect stress real-time monitor, operate by step 3.
For bonded prestressed tendon, can monitor prestress value when stretch-draw, operating procedure is step one, step 2, step 3;
For unbonded prestressing tendon, can according to stress real-time monitor Real-Time Monitoring effective prestress size between the structure operating period, if when it is lower than effective prestress required for normal use, can compensate loss of prestress, operating procedure is step one, step 2, step 3, step 4.
Operating principle:
Prestressing force Real-Time Monitoring intermediate plate ground tackle of the present invention uses electric Wheatstone bridge principle, eight resistance strain gages 5 are pasted in the octagon region of interior anchor ring 2, wherein, octahedral four relative each sides, side paste two resistance strain gages 5 respectively, arrange along anchor ring Y for one, another is arranged perpendicular to its Y, takes temperature self-compensation, is linked to be Hui Sitong full-bridge.Interior anchor ring 2 will produce compressive strain after being subject to the pressure that presstressed reinforcing steel 11 transmits, and its Wheatstone bridge consisted of resistance strain gage 5 is converted to the signal of telecommunication, convert electrical signals to power or stress intensity by external resistor straining testing equipment; During to presstressed reinforcing steel 11 stretch-draw, and in the normal use procedure of prestressed reinforced concrete construction, due to the compressive strain that anchor ring strain variation causes, all can be the resistance strain gage of ground tackle and coupled resistor straining testing equipment real time record, thus achieve the Real-Time Monitoring of presstressed reinforcing steel effective prestress.
Claims (4)
1. a prestressing force Real-Time Monitoring intermediate plate ground tackle, described intermediate plate ground tackle comprises outer nut (1), interior anchor ring (2), monitor (7), connector (6) and eight resistance strain gages (5), it is characterized in that: described intermediate plate ground tackle also comprises wedge shape cone cylinder (3), described outer nut (1) is octagon nut, outer nut (1) is processed with wire duct (4), the external surface of interior anchor ring (2) is processed with along its length external screw thread (2-1), one end of interior anchor ring (2) is processed with wedged hole (2-3), the other end of interior anchor ring (2) is processed with centre bore (2-4), wedged hole (2-3) is coaxial with the centre bore (2-4) of interior anchor ring (2) and be communicated with and arrange, the small end of wedged hole (2-3) is connected with the centre bore (2-4) of interior anchor ring (2), the external surface of interior anchor ring (2) is radially processed with octagon groove (2-2), wire duct (4) is corresponding with the axial location of octagon groove (2-2), monitor (7) is connected with eight resistance strain gages (5) by connector (6), four sides alternate in octagon groove are provided with eight resistance strain gages (5), the each side being provided with resistance strain gage (5) is provided with two resistance strain gages (5), wedge shape cone cylinder (3) is formed by two half cone-shaped intermediate plates (3-1) fastening, each half cone-shaped intermediate plate (3-1) along its length on be processed with clip groove (3-2), cannelure (3-3) is processed with in wedge shape cone cylinder (3) greatly end radially-outer surface, wedge shape cone cylinder (3) is arranged in wedged hole (2-3).
2. prestressing force Real-Time Monitoring intermediate plate ground tackle according to claim 1, it is characterized in that: be provided with two resistance strain gages (5) vertical setting mutually that each side of resistance strain gage (5) is arranged, take temperature self-compensation, be linked to be Hui Sitong full-bridge.
3. prestressing force Real-Time Monitoring intermediate plate ground tackle according to claim 1 and 2, is characterized in that: the axial location of octagon groove (2-2) is corresponding with the small end axial location of wedged hole (2-3).
4. utilize the ground tackle of the prestressing force Real-Time Monitoring intermediate plate ground tackle in claim 1-3 described in arbitrary claim to open an anchor method, it is characterized in that: described anchor method is realized by following steps:
Step one, anchorage installation: interior anchor ring (2) is sleeved on presstressed reinforcing steel (11), then wedge shape is bored cylinder (3) to fill in wedged hole (2-3), then monitor (7) is connected with outer nut (1) at connector (6) place;
Step 2, stretch-draw jack (12): read registration in real time by monitor (7), σ to be achieved
contime, outer nut (1) is tightened anchor ring (2) bottom inwardly, loosens jack (12), reading displayed device registration; As being less than σ
con, be again stretched to σ
con, and continue outer nut (1) to tighten anchor ring (2) bottom inwardly, loosen jack (12), read registration;
Wherein σ
confor presstressed reinforcing steel (11) control stress for prestressing, value is 0.4f
ptk≤ σ
con≤ 0.75f
ptk, f
ptkfor presstressed reinforcing steel (11) ultimate strength standard value;
Step 3, show value by stress real-time monitor, repeat step 2, until reach σ
contill;
Step 4, between prestressed reinforced concrete construction (14) operating period, connect stress real-time monitor, operate by step 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510330083.5A CN104895334B (en) | 2015-06-15 | 2015-06-15 | Prestressing force monitors intermediate plate anchorage and its anchorage anchor method in real time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510330083.5A CN104895334B (en) | 2015-06-15 | 2015-06-15 | Prestressing force monitors intermediate plate anchorage and its anchorage anchor method in real time |
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|---|---|
| CN104895334A true CN104895334A (en) | 2015-09-09 |
| CN104895334B CN104895334B (en) | 2017-08-25 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444930A (en) * | 2015-12-19 | 2016-03-30 | 长安大学 | Anchor bearing plate device used for measuring anchoring force of single steel cable and measuring method |
| CN105804325A (en) * | 2016-03-24 | 2016-07-27 | 扬州大学 | Prestressed reinforcement anchorage device and real-time monitoring system for effective prestress of reinforcements |
| CN106436570A (en) * | 2016-08-31 | 2017-02-22 | 杭州浙锚预应力有限公司 | Intelligent stay cable anchor device |
| CN107219168A (en) * | 2017-08-02 | 2017-09-29 | 贵州工程应用技术学院 | A kind of advance damage intelligent injury detector |
| CN107884276A (en) * | 2017-11-24 | 2018-04-06 | 山东高速工程检测有限公司 | A kind of anchor drawing force checking device and detection method for improving detection level |
| CN109900395A (en) * | 2019-04-10 | 2019-06-18 | 四川省交通勘察设计研究院有限公司 | It is a kind of can real-time monitoring loss of prestress device |
| CN112047258A (en) * | 2020-09-24 | 2020-12-08 | 天津市振华预应力技术有限公司 | Clamp type quick anchor-dismantling jack and use method thereof |
| CN112324154A (en) * | 2020-11-05 | 2021-02-05 | 重庆交通大学 | Prestressed tendon anchoring method capable of preventing retraction deformation loss and clamping piece assembly |
| CN116608975A (en) * | 2023-05-23 | 2023-08-18 | 江苏大学 | CFRP sensor-based prestress anchorage structure health monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105444930A (en) * | 2015-12-19 | 2016-03-30 | 长安大学 | Anchor bearing plate device used for measuring anchoring force of single steel cable and measuring method |
| CN105804325A (en) * | 2016-03-24 | 2016-07-27 | 扬州大学 | Prestressed reinforcement anchorage device and real-time monitoring system for effective prestress of reinforcements |
| CN106436570A (en) * | 2016-08-31 | 2017-02-22 | 杭州浙锚预应力有限公司 | Intelligent stay cable anchor device |
| CN107219168A (en) * | 2017-08-02 | 2017-09-29 | 贵州工程应用技术学院 | A kind of advance damage intelligent injury detector |
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| CN107884276A (en) * | 2017-11-24 | 2018-04-06 | 山东高速工程检测有限公司 | A kind of anchor drawing force checking device and detection method for improving detection level |
| CN109900395A (en) * | 2019-04-10 | 2019-06-18 | 四川省交通勘察设计研究院有限公司 | It is a kind of can real-time monitoring loss of prestress device |
| CN112047258A (en) * | 2020-09-24 | 2020-12-08 | 天津市振华预应力技术有限公司 | Clamp type quick anchor-dismantling jack and use method thereof |
| CN112324154A (en) * | 2020-11-05 | 2021-02-05 | 重庆交通大学 | Prestressed tendon anchoring method capable of preventing retraction deformation loss and clamping piece assembly |
| CN112324154B (en) * | 2020-11-05 | 2022-02-15 | 重庆交通大学 | Prestressed tendon anchoring method capable of preventing retraction deformation loss |
| CN116608975A (en) * | 2023-05-23 | 2023-08-18 | 江苏大学 | CFRP sensor-based prestress anchorage structure health monitoring system and method |
| CN116608975B (en) * | 2023-05-23 | 2024-06-11 | 江苏大学 | CFRP sensor-based prestress anchorage structure health monitoring system and method |
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