CN212903682U - Laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device - Google Patents
Laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device Download PDFInfo
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- CN212903682U CN212903682U CN202022399236.0U CN202022399236U CN212903682U CN 212903682 U CN212903682 U CN 212903682U CN 202022399236 U CN202022399236 U CN 202022399236U CN 212903682 U CN212903682 U CN 212903682U
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Abstract
The utility model discloses a laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device. The device comprises a rack, a precast concrete test block, a fixed end sensor, a fixed end jack and a fixed end working anchor plate which are arranged on the outer side of a fixed end plate of the rack from near to far, a precast concrete test block, a tensioning end working anchor plate, a tensioning end sensor, a tensioning end jack and a tool anchor plate which are arranged on the outer side of a tensioning end plate of the rack from near to far, and a test block hauling trolley and a jack hauling trolley; the axial center hole of the precast concrete test block is a cylindrical hole with an outer end communicated with an inner end, and a restraint ring with a matched shape is sleeved in the outer end bell hole; the frame fixed end plate, the fixed end sensor, the fixed end jack, the frame tensioning end plate, the tensioning end sensor and the tensioning end jack are all of hollow structures. Utilize the utility model discloses can detect the frictional resistance of prestressed anchorage mouth and horn mouth fast accurately in the laboratory, accurate, high-efficient, safety, with low costs.
Description
Technical Field
The utility model relates to a frictional resistance test's among bridge, the construction technical field, more specifically say a laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device.
Background
In the prestress tension process, friction force is inevitably generated because the prestress beam is inevitably contacted with the bell mouth and the anchorage opening and slides relatively. If the prestressed tendons are properly arranged, the spanning capability of the structure can be greatly leaped, the engineering quality is greatly improved, the self weight of the structure can be greatly reduced, and a large amount of steel and concrete can be saved.
In actual works, the initial prestress applied to the concrete element is subject to stress losses over time for various reasons. The loss of the prestress generated in the stretching, bearing and operating periods can generate certain influence on the bridge structure, and particularly for the prestressed structure with special properties such as long beam and bending, the influence of the loss can directly relate to the safety quality of the bridge construction. The causes of stress loss in the pretensioned member are: elastic compression, shrinkage, creep and relaxation of prestressed reinforcement of concrete; the reasons for the stress loss in the post-tensioned member are: the elastic compression, shrinkage, creep of the concrete, and the relaxation, frictional resistance of the prestressed reinforcement and the loss caused by the anchor plate. Among these, elastic compression, frictional resistance and anchor plate loss are transient, while bar relaxation loss, concrete shrinkage and creep are time-varying. If the prestress configuration is improper, not only materials are wasted, but also concrete structures are cracked and even damaged, so the prestress configuration has important significance for engineering.
At present, most of the tests of the frictional resistance of the anchor mouth and the bell mouth for the prestress are measured by adopting a cast-in-place concrete test piece, the cast-in-place concrete test piece is a disposable test piece, 4 cubic meters of concrete and 0.5 ton of steel bars are needed, and the prefabrication cost is high; the problems of large investment of manpower and material resources and long time consumption exist in field detection; the field detection also has the problems of large auxiliary labor capacity of workers, low detection precision, temporary fault of detection equipment, high cost of detection personnel, uncontrolled potential safety hazard in the detection process, more investment of detection equipment and the like. Therefore, the development of the test block detection in the laboratory is particularly necessary, but a matched device special for detecting the frictional resistance of the prestressed anchor mouth and the bell mouth in the laboratory is required to be designed.
Disclosure of Invention
The utility model aims at providing a laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device just to the weak point that exists among the above-mentioned prior art. Utilize the utility model discloses only need prepare the precast concrete test block of two little volumes just can accurately detect the frictional resistance of prestressed anchorage mouth and horn mouth fast, make the tradition need the outdoor frictional force that goes on test successfully shift to detect in the laboratory, improved experimental precision, detection efficiency, experimental security greatly, greatly reduced the detection cost, have accurate, high-efficient, safe, with low costs, application scope extensively, be convenient for load and unload the advantage of sample.
The purpose of the utility model can be realized by the following technical measures:
the utility model discloses a laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device includes the frame (the utility model discloses a frame both ends cooperation small-size precast concrete test block replaces the disposable test piece of bulky concrete of traditional site pouring, small-size precast concrete test block compares prefabricated cycle with the prefabricated test piece of traditional large-size and shortens greatly, save a large amount of prefabricated material, both can shorten test time greatly, improve test efficiency, can reduce material resources again, reduce prefabrication cost), arrange the precast concrete test block in the frame fixed end plate outside from nearly and far away, the stiff end sensor, stiff end jack and stiff end work anchor plate (pressfitting contact has constituted the biography power part of stiff end in proper order, and can show the pulling force value that transmits the stiff end through the stiff end sensor), arrange the precast concrete test block in the frame end plate outside from nearly and far away, from nearly and far away, A tension end working anchor plate, a tension end sensor, a tension end jack and a tool anchor plate (a force transmission component of the tension end is formed by pressing and contacting in sequence, and the tension value of the tension end can be displayed by the tension end sensor), and a test block hauling trolley and a jack hauling trolley (respectively used for hauling a concrete test block and a jack at the corresponding end); the fixed end sensor and the tensioning end sensor are electrically connected with an external tester through data lines (after tensioning force is applied to the tensioning end, the tester respectively displays the prestress transmitted by the pressure sensors at the two ends, and automatically calculates the difference value of the prestress at the two ends, and the difference value of the prestress at the two ends is equal to the friction resistance of the pipeline); the axial center hole of the precast concrete test block is a combined hole formed after an outer-end bell-mouth hole is communicated with an inner-end cylindrical hole; the frame fixed end plate, the fixed end sensor, the fixed end jack, the frame tensioning end plate, the tensioning end sensor and the tensioning end jack are all of hollow structures (convenient for smoothly penetrating and installing steel strands).
In the utility model, clamping pieces (used for locking the steel strand) are embedded in the tensioning holes of the fixed end working anchor plate, the tensioning end working anchor plate and the tool anchor plate; an anchor backing plate and a backing plate I (for transmitting tensile force) are sequentially arranged between the fixed end working anchor plate and the fixed end jack, a limiting plate and an anchor backing plate are sequentially arranged between the tension end working anchor plate and the tension end sensor (the anchor backing plate is used for supporting the end surface of the corresponding anchor plate and transmitting tension force, when the tension end working anchor plate is subjected to the tension loading action of a tension end jack, the clamping piece moves rightwards along with the steel strand due to the existence of friction force, in order to prevent the clamping piece from falling off from the tension end working anchor plate, the utility model designs the limiting plate to limit the clamping piece, the limiting plate limits the rightward movement range of the clamping piece along with the steel strand and can not exceed the position of the limiting plate, and the clamping piece can smoothly return to the tension hole of the tension end working anchor plate along with the retracted steel strand after the tension end jack is unloaded), and a base plate II and an anchor base plate (for transmitting tension force) are sequentially arranged between the tension end jack and the tool anchor plate.
The utility model discloses in the guide rail (as the orbit of test block haulage dolly and jack haulage dolly) has been laid along vertically to the below of test block haulage dolly and jack haulage dolly.
The utility model discloses in two supports of increaseing (can realize frame height-adjustable, can satisfy the precast concrete test block centering demand of not co-altitude specification, enlarged) are all installed to the bottom of frame fixed end plate and frame stretch-draw end plate the utility model discloses a commonality and application scope.
The utility model discloses in install the snap ring between the right-hand member face of backing plate I and the left end face of stiff end jack cylinder body, the snap ring forms a mounting hole that is used for running through the stiff end jack piston after being connected by two semi-circular staple bolt antithetical couplets (the biography power condition of stiff end is steel strand wires, the clamping piece, stiff end work anchor plate, the anchor backing plate, backing plate I, the snap ring, the stiff end jack cylinder body in proper order owing to install the snap ring, can avoid directly transmitting on the stiff end jack piston by power, avoid the hydraulic oil among the compression stiff end jack to cause, thereby effectively avoid the stiff end to produce the displacement because of hydraulic oil compression.
The design principle of the utility model is as follows:
utilize the utility model discloses only need prepare the precast concrete test block of two little volumes and just can accurately detect the frictional resistance of prestressed anchorage mouth and horn mouth fast, make the tradition need the outdoor frictional force that goes on test successfully transfer to detect in the laboratory. More specifically, the steel strand bundle in the inner cavity of the rack extends towards the fixed end and the stretching end simultaneously along the axis direction, the two extending ends respectively and sequentially penetrate through the precast concrete test block, the horn mouth, the sensor, the jack and the anchor plate from near to far, the pressure sensors at the two ends are connected with the tester through data lines, after the stretching end applies stretching force, the prestress transmitted by the pressure sensors at the two ends is respectively displayed through the tester, the difference value of the prestress at the two ends is automatically calculated, and the difference value of the prestress at the two ends is equal to the friction resistance of the pipeline. Because the small-volume precast concrete test block is required in the test process of the utility model, compared with the traditional precast test block, the small-volume precast concrete test block has greatly shortened precast period and saves a large amount of precast materials, thereby greatly shortening the test time, improving the test efficiency, reducing the material resources and lowering the precast cost; because the utility model can successfully transfer the traditional friction force test which needs to be carried out outdoors into the laboratory for detection, the test precision and the test safety are greatly improved; and simultaneously, because the utility model relates to a laboratory test equipment can used repeatedly, and detection efficiency is high, can save too much equipment input, greatly reduced equipment cost. Because the utility model discloses well frame height can be adjusted, can satisfy the precast concrete test block centering demand of not co-altitude specification, has enlarged the utility model discloses a commonality and application scope. Therefore, the utility model has the advantages of accuracy, high efficiency, safety, low cost, wide application range and convenient loading and unloading of samples.
The utility model has the advantages of:
utilize the utility model discloses only need prepare the precast concrete test block of two little volumes just can accurately detect the frictional resistance of prestressed anchorage mouth and horn mouth fast, make the tradition need the outdoor frictional force that goes on test successfully shift to detect in the laboratory, improved experimental precision, detection efficiency, experimental security greatly, greatly reduced the detection cost, have accurate, high-efficient, safe, with low costs, application scope extensively, be convenient for load and unload the advantage of sample.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of the fixed end at a.
Fig. 3 is an enlarged view of the tension end at B.
The sequence numbers in the figures illustrate: 1. 1-1 parts of a rack, 1-2 parts of a rack fixing end plate, 1-3 parts of a rack tensioning end plate and a height-adjusting support; 2. prefabricating a concrete test block, 2-1, an outer end horn hole, 2-2 and an inner end cylindrical hole; 3. the device comprises a tension end working anchor plate, 3 ', a fixed end working anchor plate, 4, a tension end sensor, 4 ', a fixed end sensor, 5, a tension end jack, 5 ', a fixed end jack, 5 ' -1, a fixed end jack piston, 5 ' -2, a fixed end jack cylinder body, 6, a tool anchor plate, 7, a test block hauling trolley, 8, a jack hauling trolley, 9, a clamping piece, 10, an anchor backing plate, 11, a limiting plate, 12, a guide rail, 13, a clamping ring, 14-1, a backing plate I, 14-2 and a backing plate II.
Detailed Description
The utility model is further described with the following figures:
as shown in figures 1-3, the device for detecting the frictional resistance of the prestressed anchorage port and the horn mouth in the laboratory comprises a frame 1 (the utility model adopts the frame 1 to match with the small-volume precast concrete test block 2 at the two ends to replace the traditional cast-in-place large-volume concrete one-time test piece, the small-volume precast concrete test block has the advantages of greatly shortened prefabricating period and greatly saved precast material compared with the traditional large-volume precast test piece, not only can greatly shorten the testing time and improve the testing efficiency, but also can reduce material resources and reduce the prefabricating cost), the precast concrete test block 2, the fixed end sensor 4 ', the fixed end jack 5' and the fixed end working anchor plate 3 '(which are sequentially pressed and contacted to form a force transmission part of the fixed end and can display the tension value transmitted to the fixed end through the fixed end sensor 4') which are arranged at the outer side of the frame fixed end plate 1-1 from near to far, the system comprises a precast concrete test block 2, a stretching end working anchor plate 3, a stretching end sensor 4, a stretching end jack 5 and a tool anchor plate 6 (a force transmission component of the stretching end is formed by pressing and contacting in sequence) which are arranged at the outer side of a stretching end plate 1-2 of a rack from near to far, and a test block hauling trolley 7 and a jack hauling trolley 8 (which are respectively used for hauling the concrete test block 2 and a jack at the corresponding end); the fixed end sensor 4' and the tension end sensor 4 are electrically connected with an external tester through data lines (after tension force is applied to the tension end, the tester respectively displays prestress transmitted by the pressure sensors at the two ends, and automatically calculates the difference of the prestress at the two ends, and the difference of the prestress at the two ends is equal to the friction resistance of the pipeline); the axial center hole of the precast concrete test block 2 is a combined hole formed after an outer end horn hole 2-1 is communicated with an inner end cylindrical hole 2-2; the frame fixing end plate 1-1, the fixing end sensor 4 ', the fixing end jack 5', the frame tensioning end plate 1-2, the tensioning end sensor 4 and the tensioning end jack 5 are all of hollow structures (steel strands can be conveniently and smoothly threaded).
In the utility model, clamping pieces 9 (used for locking steel strands) are embedded in the tensioning holes of the fixed end working anchor plate 3', the tensioning end working anchor plate 3 and the tool anchor plate 6; an anchor backing plate 10 and a backing plate I14-1 (for transmitting tension) are sequentially arranged between a fixed end working anchor plate 3 'and a fixed end jack 5', a limiting plate 11 and an anchor backing plate 10 (the anchor backing plate 10 is used for supporting the end surface of the corresponding anchor plate and transmitting tension) are sequentially arranged between a tensioning end working anchor plate 3 and a tensioning end sensor 4, when the tensioning end working anchor plate 3 is subjected to the tensioning loading action of the tensioning end jack 5, the clamping piece 9 moves rightwards along with the steel strand due to the existence of friction force, in order to prevent the clamping piece 9 from falling off from the tensioning end working anchor plate 3, the utility model designs that the limiting plate 11 limits the clamping piece 9, limits the rightwards moving range of the clamping piece 9 along with the steel strand to be incapable of exceeding the position of the limiting plate 11, and enables the steel strand which is retracted by the clamping piece 9 to smoothly return to the hole of the tensioning end working anchor plate 3 after the tensioning end jack 5 is unloaded), and a backing plate II 14-2 and an anchor backing plate 10 (for transmitting tension force) are sequentially arranged between the tension end jack 5 and the tool anchor plate 6.
The utility model discloses in guide rail 12 (as the orbit of test block haulage dolly 7 and jack haulage dolly 8) has been laid along vertically to the below of test block haulage dolly 7 and jack haulage dolly 8.
The utility model discloses in two height-adjustable supports 1-3 (can realize that frame height is adjustable, can satisfy the precast concrete test block centering demand of not co-altitude specification, enlarged the utility model discloses a commonality and application scope) are all installed to the bottom of frame fixed end plate 1-1 and frame stretch-draw end plate 1-2.
In the utility model, a snap ring (13) is arranged between the right end surface of the backing plate I (14-1) and the left end surface of the fixed end jack cylinder body (5 ' -2), the snap ring (13) is formed by connecting two semicircular hoops in a buckling way to form a mounting hole for penetrating through the fixed end jack piston (5 ' -1) (the force transmission condition of the fixed end in the tensioning process is sequentially a steel strand, a clamping piece 9, a fixed end working anchor plate 3 ', an anchor backing plate 10, a backing plate I14-1, the snap ring 13 and the fixed end jack cylinder body 5 ' -2. due to the installation of the snap ring 13, the force can be prevented from being directly transmitted to the fixed end jack piston 5 ' -1, the hydraulic oil in the fixed end jack 5 ' is prevented from being compressed, thereby the displacement of the fixed end caused by the compression of the hydraulic oil is effectively avoided, namely, the jack 5 ' can be in a rigid state when the tensioning end is loaded, improving detection accuracy and stability).
The utility model discloses a concrete in service behavior as follows:
firstly, arranging all the components in sequence at relative positions in the structural description, and ensuring that the central axes of all the components are collinear; then, the steel strand is penetrated and installed along the central axis, and the steel strand is locked through the fixed end working anchor plate 3', the tensioning end working anchor plate 3, the tool anchor plate 6 and the clamping pieces 9 which are respectively embedded; subsequently, the readings of the fixed end sensor 4' and the tension end sensor 4 are cleared; then, the tensioning end jack 5 starts to load slowly and uniformly, and the loading time is not less than 3 min; when the load reaches 80% of the standard strength of the prestressed tendon for the first time, recording the reading and the reading difference of the primary fixed end sensor 4' and the tension end sensor 4; then, the tensioning end jack 5 is unloaded, and the reading values of the fixed end sensor 4' and the tensioning end sensor 4 are reset; repeating the loading action of the tensioning end jack 5, recording the reading and the reading difference value of the fixed end sensor 4' and the tensioning end sensor 4 again when the load reaches 80% of the standard strength of the prestressed tendon for the second time, and unloading and resetting again after recording; repeatedly loading for the third time and recording the readings and reading difference values of the fixed end sensor 4' and the stretching end sensor 4; then, the average value of the difference values of the three readings is calculated to be the frictional resistance of the anchor mouth and the horn mouth.
Claims (5)
1. The utility model provides a laboratory detects device of frictional resistance of prestressed anchorage mouth and horn mouth which characterized in that: the device comprises a rack (1), a precast concrete test block (2), a fixed end sensor (4 '), a fixed end jack (5 ') and a fixed end working anchor plate (3 ') which are arranged on the outer side of a fixed end plate (1-1) of the rack from near to far, a precast concrete test block (2), a tensioning end working anchor plate (3), a tensioning end sensor (4), a tensioning end jack (5) and a tool anchor plate (6) which are arranged on the outer side of a tensioning end plate (1-2) of the rack from near to far, a test block hauling trolley (7) and a jack hauling trolley (8); the fixed end sensor (4') and the tensioning end sensor (4) are electrically connected with an external tester through data lines; the axial center hole of the precast concrete test block (2) is a combined hole formed after an outer end horn hole (2-1) is communicated with an inner end cylindrical hole (2-2); the frame fixing end plate (1-1), the fixing end sensor (4 '), the fixing end jack (5'), the frame tensioning end plate (1-2), the tensioning end sensor (4) and the tensioning end jack (5) are all of a hollow structure.
2. The apparatus for laboratory testing of frictional resistance of prestressed anchorage port and bell mouth as claimed in claim 1, wherein: clamping pieces (9) are embedded in the tensioning holes of the fixed end working anchor plate (3'), the tensioning end working anchor plate (3) and the tool anchor plate (6); an anchor backing plate (10) and a backing plate I (14-1) are sequentially arranged between a fixed end working anchor plate (3 ') and a fixed end jack (5'), a limiting plate (11) and the anchor backing plate (10) are sequentially arranged between a tensioning end working anchor plate (3) and a tensioning end sensor (4), and a backing plate II (14-2) and the anchor backing plate (10) are sequentially arranged between the tensioning end jack (5) and a tool anchor plate (6).
3. The apparatus for laboratory testing of frictional resistance of prestressed anchorage port and bell mouth as claimed in claim 1, wherein: and guide rails (12) are longitudinally paved below the test block hauling trolley (7) and the jack hauling trolley (8).
4. The apparatus for laboratory testing of frictional resistance of prestressed anchorage port and bell mouth as claimed in claim 1, wherein: two height-adjusting supports (1-3) are respectively arranged at the bottoms of the rack fixed end plate (1-1) and the rack tensioning end plate (1-2).
5. The apparatus for laboratory testing of frictional resistance of prestressed anchorage port and bell mouth as claimed in claim 2, wherein: a snap ring (13) is installed between the right end face of the base plate I (14-1) and the left end face of the fixed end jack cylinder body (5 '-2), and the snap ring (13) is formed into an installation hole used for penetrating through the fixed end jack piston (5' -1) after being buckled and connected through two semicircular hoops.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022399236.0U CN212903682U (en) | 2020-10-26 | 2020-10-26 | Laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device |
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|---|---|---|---|
| CN202022399236.0U CN212903682U (en) | 2020-10-26 | 2020-10-26 | Laboratory detects frictional resistance's of prestressed anchorage mouth and horn mouth device |
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| CN212903682U true CN212903682U (en) | 2021-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278099A (en) * | 2021-11-29 | 2022-04-05 | 中交世通(重庆)重工有限公司 | Prestress steel structure tool rod piece system |
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2020
- 2020-10-26 CN CN202022399236.0U patent/CN212903682U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278099A (en) * | 2021-11-29 | 2022-04-05 | 中交世通(重庆)重工有限公司 | Prestress steel structure tool rod piece system |
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Address after: No.26, Huahua Road, high tech Development Zone, Zhengzhou, Henan Province, 450001 Patentee after: Sinosteel Zhengzhou metal products Research Institute Co.,Ltd. Patentee after: SINOSTEEL GROUP NANJING NEW MATERIAL RESEARCH INSTITUTE Co.,Ltd. Address before: No.26, Huahua Road, high tech Development Zone, Zhengzhou, Henan Province, 450001 Patentee before: SINOSTEEL ZHENGZHOU RESEARCH INSTITUTE OF STEEL WIRE & STEEL PRODUCTS Co.,Ltd. Patentee before: SINOSTEEL GROUP NANJING NEW MATERIAL RESEARCH INSTITUTE Co.,Ltd. |
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