CN217156074U - Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system - Google Patents
Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system Download PDFInfo
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- CN217156074U CN217156074U CN202121391044.3U CN202121391044U CN217156074U CN 217156074 U CN217156074 U CN 217156074U CN 202121391044 U CN202121391044 U CN 202121391044U CN 217156074 U CN217156074 U CN 217156074U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- 238000005096 rolling process Methods 0.000 title claims abstract description 33
- 239000004567 concrete Substances 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000011513 prestressed concrete Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 9
- 238000004873 anchoring Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to the tension torque detection technical field, and discloses a tension torque detection system for a prestressed finish-rolled twisted steel bar of a concrete bridge, which comprises a finish-rolled twisted steel bar, a corrugated pipe and a tension end anchor backing plate, stiff end anchor backing plate, sleeve and digital display formula electric torque wrench, finish rolling twisted steel upper end links to each other with tensioning end anchor backing plate through tensioning end ground tackle, finish rolling twisted steel lower extreme passes through the stiff end ground tackle and links to each other with stiff end anchor backing plate, the sleeve sets up on tensioning end ground tackle, digital display formula electric torque wrench suit is on the sleeve, the too big problem of prestressing force finish rolling twisted steel tension loss has effectively been solved, the effectual prestressed concrete structure fracture or the inefficacy of preventing, structural stability and reliability have been improved, easy operation, can satisfy the requirement that the job site large tracts of land detected, adaptable finish rolling twisted steel prestressing force system in multiple specification.
Description
Technical Field
The utility model relates to a tension force moment of torsion detects technical field, especially relates to a concrete bridge prestressing finish rolling twisted steel tension force moment of torsion detecting system.
Background
The method has the advantages of high strength, low looseness, no welding quality restriction on connection, simple construction, convenient anchoring and the like, and is widely applied to a large-span concrete box girder bridge web vertical prestressed system. However, the web cracking problem occurs in the construction and operation processes of many concrete box girder bridges, and the related documents disclose that the application of the vertical prestress of the web cannot completely prevent the cracking of the web of the concrete box girder bridge, and one of the main reasons is that the prestress loss is caused by different construction proficiency of workers, jack oil gauge errors, anchor backing plate installation errors and the like in the stretching construction of the prestress finish rolling threaded steel bars. When the loss of the vertical prestress tension force is too large, the main tension stress of the box girder web cannot be effectively reduced, the web is easy to generate an oblique crack, and the durability and the safety of the bridge are seriously influenced. Therefore, it is important to provide an effective detection method and formulate a corresponding detection standard for effectively detecting the tension quality of the finish-rolled threaded steel bar in the construction process.
At present, two tensioning methods for finish rolling twisted steel in China are mainly adopted, one method is a feed-through pressure sensor and a hydraulic jack tensioning method, and the method has the defects of inconvenient construction, high cost and the like; the other method is a nondestructive testing method by establishing and identifying a mathematical model between the rigidity change coefficient of the exposed end of the finish-rolled twisted steel and the natural vibration frequency and effective tension force, and the method has the defects of inaccurate identification of the rigidity change coefficient and the natural vibration frequency of the exposed end of the finish-rolled twisted steel and the like. Both methods can not meet the requirement of large-area detection on the tension quality of finish-rolled threaded steel bars on construction sites. Therefore, it is necessary to provide an accurate, economical and fast tension detection system for the finish-rolled prestressed threaded steel bars.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model discloses a concrete bridge prestressing finish rolling twisted steel tension force torque detecting system has effectively solved the too big problem of prestressing finish rolling twisted steel tension force loss, and the effectual prestressed concrete structure that prevents ftractures or became invalid, has improved structural stability and reliability.
The utility model aims at adopting the following technical scheme to realize:
the system for detecting the tension force torque of the prestressed finish-rolled threaded steel bar of the concrete bridge comprises a finish-rolled threaded steel bar, a corrugated pipe, a tension end anchor backing plate, a fixed end anchor backing plate, a sleeve and a digital display type electric torque wrench;
the tensioning end anchor backing plate and the fixed end anchor backing plate are arranged in the concrete bridge web plate in an up-down parallel manner;
the finish-rolled twisted steel sequentially penetrates through the tensioning end anchor backing plate and the fixed end anchor backing plate, wherein the upper end of the finish-rolled twisted steel is connected with the tensioning end anchor backing plate through a tensioning end anchorage device, and the lower end of the finish-rolled twisted steel is connected with the fixed end anchor backing plate through a fixed end anchorage device;
the corrugated pipe is sleeved on the finish-rolled twisted steel, and the corrugated pipe is positioned between the tensioning end anchor backing plate and the fixed end anchor backing plate;
the sleeve is arranged on the tensioning end anchorage device;
the digital display type electric torque wrench is sleeved on the sleeve and is connected with a torque wrench reaction force arm.
Further, still include portable power, portable power and digital display formula electric torque wrench electric connection.
Further, the device also comprises an axial force meter, wherein the axial force meter is arranged between the fixed end anchorage device and the fixed end anchorage backing plate.
Furthermore, the corrugated pipe is sleeved with a spiral rib.
Furthermore, the tensioning end anchorage and the fixed end anchorage are both nuts.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the digital display type electric torque wrench is used for screwing and tensioning, so that the torque value can be accurately controlled, the problem of overlarge tension loss of the prestressed finish rolling threaded steel bar is effectively solved, the prestressed concrete structure is effectively prevented from cracking or losing efficacy, and the structural stability and reliability are improved.
(2) The method is easy to operate, can meet the requirement of large-area detection on a construction site, and is suitable for finish rolling deformed steel bar prestress systems of various specifications.
Drawings
FIG. 1 is a schematic structural view of a system for detecting the torque coefficient of a finish rolling twisted steel joint pair according to the present invention;
fig. 2 is the utility model discloses prestressing force finish rolling twisted steel moment of torsion and tension force detecting system's schematic structure.
In the figure: 1. finish rolling the twisted steel; 2. a bellows; 3. a spiral rib; 4. a tension end anchorage; 5. a fixed end anchorage device; 6. tensioning the end anchor backing plate; 7. the fixed end is an anchor backing plate; 8. a sleeve; 9. a digital display electric torque wrench; 10. a torque wrench reaction arm; 11. a mobile power supply; 12. an axial force meter.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
As shown in figure 1, the system for detecting the tension torque of the prestressed finish-rolling threaded steel bar of the concrete bridge comprises a finish-rolling threaded steel bar 1, a corrugated pipe 2, a tension end anchor backing plate 6, a fixed end anchor backing plate 7, a sleeve 8 and a digital display type electric torque wrench 9, wherein the tension end anchor backing plate 6 and the fixed end anchor backing plate 7 are arranged in a concrete bridge web plate in an up-down parallel manner, the finish-rolling threaded steel bar 1 sequentially passes through the tension end anchor backing plate 6 and the fixed end anchor backing plate 7, the upper end of the finish-rolling threaded steel bar 1 is connected with the tension end anchor backing plate 6 through a tension end anchorage device 4, the lower end of the finish-rolling threaded steel bar 1 is connected with the fixed end anchor backing plate 7 through a fixed end anchorage device 5, the corrugated pipe 2 is sleeved on the finish-rolling threaded steel bar 1, the corrugated pipe 2 is positioned between the tension end anchor backing plate 6 and the fixed end anchor backing plate 7, the sleeve 8 is arranged on the tension end anchorage device 4, the digital display type electric torque wrench 9 is sleeved on the sleeve 8, the digital display type electric torque wrench 9 is connected with a torque wrench reaction force arm 10.
As the preferred embodiment, still include portable power source 11, portable power source 11 and digital display formula electric torque wrench 9 electric connection improve the removal convenience, can follow the nimble removal in construction place.
As a preferred embodiment, the device further comprises an axial force meter 12, wherein the axial force meter 12 is arranged between the fixed-end anchorage device 5 and the fixed-end anchorage backing plate 7, and the axial force meter 12 is used for detecting whether the tension of the finish-rolled threaded steel bar 1 reaches a designed value or not when the digital display type electric torque wrench 9 applies the twisting and tensioning end anchorage device 4, so that accurate control is realized.
In a preferred embodiment, the corrugated pipe 2 is externally sleeved with the spiral ribs 3, and the spiral ribs 3 improve the compressive strength of the concrete after anchoring, prevent the concrete under anchoring from generating local damage under the action of tensile stress and improve the reliability.
In a preferred embodiment, both the tensioning end anchorage 4 and the fixed end anchorage 2 are nuts.
The utility model discloses a theory of operation:
firstly, an average value of the torque coefficients of the connection pairs of the finish rolling twisted steel 1 is obtained through a detection test, a tensioning control torque value of the prestress finish rolling twisted steel 1 is obtained, and tensioning construction of the prestress finish rolling twisted steel 1 is carried out.
As shown in fig. 1, finish-rolled twisted steel bars 1 for testing should be randomly extracted from a lot to be installed at a construction site, and 3 sets of each specification should be extracted for testing. Before the test, the finish-rolled twisted steel bar 1 penetrates into an axial force meter 12, and the axial force meter 12 is arranged between the fixed-end anchorage device 5 and the fixed-end anchorage backing plate 7. Starting the digital display type electric torque wrench 9 to twist and tension the end anchorage 4 during the test until the shaft force meter 12 reaches the tension force design value of the finish rolling threaded steel bar 1, recording the numerical values of the shaft force meter 12 and the digital display type electric torque wrench 9, and passing through
And calculating the torque coefficient of the connecting pair of the prestress finish rolling twisted steel 1. And selecting the average value of the torque coefficient tests of the connecting pair of 3 sets of finish-rolled twisted steel bars 1 as the torque coefficient during construction. In the above formula: t is a tensioning control torque of the prestressed finish-rolled twisted steel bar 1 or a tensioning screwing torque (N.m) of the prestressed finish-rolled twisted steel bar 1, P is a tensioning control force of the prestressed finish-rolled twisted steel bar 1 or a designed value of a tensile force of the prestressed finish-rolled twisted steel bar 1 or an actual measured value (kN) of the tensile force of the prestressed finish-rolled twisted steel bar 1, K is a connecting pair torque coefficient of the prestressed finish-rolled twisted steel bar 1, and d is a nominal diameter (mm) of the prestressed finish-rolled twisted steel bar 1.
The specific calculation process is as follows: the diameter d of the finish-rolled threaded steel bar 1 is 32mm, the design standard stress fpk of the prestressed finish-rolled threaded steel bar 1 is 785MPa, the tension control stress of the finish-rolled threaded steel bar 1 is 0.85fpk, and the design value P of the tension of the prestressed finish-rolled threaded steel bar 1 is 536.6 kN. In the test, the screwing torque T1 of the 1 st finish-rolled twisted steel bar 1 is 2489.8N.m, and the torque coefficient K1 is 0.145; the screwing torque T2 of the 2 nd finish-rolled twisted steel bar 1 is 2404.0N.m, and the torque coefficient K2 is 0.140; the 3 rd finish-rolled twisted steel bar 1 applied torque T3 was 2541.3n.m, and the torque coefficient K3 was 0.148. The average value of the torque coefficient of the connecting pair of the prestressed finish-rolled twisted steel 1 is 0.144, the average torque coefficient is used as the torque coefficient during construction or detection, and then the prestressed finish-rolled twisted steel 1 is subjected to tensioning construction.
The tensioning control torque value of the prestressed finish rolling deformed bar 1 is calculated according to the moment T ═ PkD, wherein: t is a tensioning control torque of the prestressed finish-rolled twisted steel bar 1 or a tensioning screwing torque (N.m) of the prestressed finish-rolled twisted steel bar 1, P is a tensioning control force of the prestressed finish-rolled twisted steel bar 1 or a designed value of a tensile force of the prestressed finish-rolled twisted steel bar 1 or an actual measured value (kN) of the tensile force of the prestressed finish-rolled twisted steel bar 1, K is a connecting pair torque coefficient of the prestressed finish-rolled twisted steel bar 1, and d is a nominal diameter (mm) of the prestressed finish-rolled twisted steel bar 1.
The tensioning construction of the prestressed finish-rolled threaded steel bar 1 adopts a fastening method, a digital display type electric torque wrench 9 is started to apply a tightening and tensioning end anchorage device 4 during construction, the digital display type electric torque wrench 9 is stopped to rotate until a torque value reaches a tensioning control torque value, and the tensioning construction of the prestressed finish-rolled threaded steel bar 1 is completed.
Finally, the torque and the tensile force of the prestressed finish rolling twisted steel 1 are detected
As shown in fig. 2, unlike the torque coefficient of the connection pair of the finish-rolled twisted steel bar 1 obtained by the test, the installation of the dynamometer 12 is not required. The tension detection of the prestressed finish-rolled twisted steel bar 1 adopts a loose-thread method, and the detection is preferably carried out between 1 hour and 48 hours after the tension construction. Starting a digital display type electric torque wrench 9 to unscrew the tensioning end anchorage device 4 during detection, loosening the instantaneous torque value when the tensioning end anchorage device 4 is loosened to obtain an actually measured torque value of the tensioning force of the prestressed finish-rolled threaded steel bar 1, and then passing the actually measured torque value
Calculating to obtain a measured value of the tension of the prestressed finish-rolled twisted steel bar 1, wherein: t is a tension control torque of the prestressed finish-rolled twisted steel bar 1 or a tension twisting torque (N.m) of the prestressed finish-rolled twisted steel bar 1, and P is a tension control force of the prestressed finish-rolled twisted steel bar 1 or a tension design value of the prestressed finish-rolled twisted steel bar 1 or a tension measured value (k) of the prestressed finish-rolled twisted steel bar 1N), K is the torque coefficient of the connecting pair of the prestressed finish-rolled threaded steel bar 1, and d is the nominal diameter (mm) of the prestressed finish-rolled threaded steel bar 1.
The specific calculation process is as follows: the diameter d of the finish-rolled twisted steel bar 1 is 34mm, the design standard stress fpk of the prestressed finish-rolled twisted steel bar 1 is 785MPa, the tension control stress of the finish-rolled twisted steel bar 1 is 0.85fpk, and the design value P of the tension of the prestressed finish-rolled twisted steel bar 1 is 605.8 kN. The average torque coefficient obtained by the prestress finish rolling twisted steel 1 connection auxiliary torque coefficient test is 0.148, the average torque coefficient is obtained according to a calculation formula T which is PKd, and the tensioning control torque T of the prestress finish rolling twisted steel 1 during construction is 3048.4 N.m.
According to the formula P ═ T/(Kd), the measured torque T is unscrewed from the anchorage 4 at the tensioning end of the 1 st finish-rolled twisted steel bar 1 during detection 1 Measured tensile force P of 3000.5n.m 1 596.3 kN; measured torque T is unscrewed to 1 stretch-draw end ground tackle 4 of nth finish rolling twisted steel n Measured tensile force P of 2998.7n.m n ＝595.9kN。
The measured value of the tension of the prestressed finish-rolled twisted steel bar 1 is in the range of 0.9P-1.1P (or 0.9T-1.1T); and (5) timely supplementing tension to a design value when tension is actually measured to be insufficient. The digital display type electric torque wrench 9 for construction and detection has a relative error of 3% in indication value, has a peak value holding function and can rotate forward and backward.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (5)
1. Concrete bridge prestressing force finish rolling twisted steel stretch-draw force torque detection system, its characterized in that: the device comprises finish-rolled twisted steel, a corrugated pipe, a tensioning end anchor backing plate, a fixed end anchor backing plate, a sleeve and a digital display type electric torque wrench;
the tensioning end anchor backing plate and the fixed end anchor backing plate are arranged in the concrete bridge web plate in an up-down parallel manner;
the finish-rolled twisted steel sequentially penetrates through the tensioning end anchor backing plate and the fixed end anchor backing plate, wherein the upper end of the finish-rolled twisted steel is connected with the tensioning end anchor backing plate through a tensioning end anchorage device, and the lower end of the finish-rolled twisted steel is connected with the fixed end anchor backing plate through a fixed end anchorage device;
the corrugated pipe is sleeved on the finish-rolled twisted steel, and the corrugated pipe is positioned between the tensioning end anchor backing plate and the fixed end anchor backing plate;
the sleeve is arranged on the tensioning end anchorage device;
the digital display type electric torque wrench is sleeved on the sleeve and is connected with a torque wrench reaction force arm.
2. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: still include portable power, portable power and digital display formula electric torque wrench electric connection.
3. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the device also comprises an axial force meter, wherein the axial force meter is arranged between the fixed end anchorage device and the fixed end anchorage backing plate.
4. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the corrugated pipe is sleeved with spiral ribs.
5. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the tensioning end anchorage device and the fixed end anchorage device are both nuts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121391044.3U CN217156074U (en) | 2021-06-22 | 2021-06-22 | Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121391044.3U CN217156074U (en) | 2021-06-22 | 2021-06-22 | Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system |
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| CN217156074U true CN217156074U (en) | 2022-08-09 |
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| CN202121391044.3U Active CN217156074U (en) | 2021-06-22 | 2021-06-22 | Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system |
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Address after: 4-6 / F, 1161 Panyu Avenue North, Donghuan street, Panyu District, Guangzhou, Guangdong 510000 Patentee after: Guangdong Heli Transportation Maintenance Technology Co.,Ltd. Country or region after: China Patentee after: GUANGDONG SHENGXIANG TRAFFIC ENGINEERING DETECTION Co.,Ltd. Address before: 4-6 / F, 1161 Panyu Avenue North, Donghuan street, Panyu District, Guangzhou, Guangdong 510000 Patentee before: GUANGDONG HELI CIVIL ENGINEERING Ltd. Country or region before: China Patentee before: GUANGDONG SHENGXIANG TRAFFIC ENGINEERING DETECTION Co.,Ltd. |