CN102912987B - Stress applying method and tool thereof for low retraction pre-stress concrete member - Google Patents
Stress applying method and tool thereof for low retraction pre-stress concrete member Download PDFInfo
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- CN102912987B CN102912987B CN201210444795.6A CN201210444795A CN102912987B CN 102912987 B CN102912987 B CN 102912987B CN 201210444795 A CN201210444795 A CN 201210444795A CN 102912987 B CN102912987 B CN 102912987B
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Abstract
The invention discloses a stress applying method and a tool thereof for a low retraction pre-stress concrete member, wherein a stretching-drawing anchor of the member is so structured that an anchor plate is installed in a threaded hole of a nut through screw thread; the low retraction pre-stress anchor with the structure secondarily stretches and draws a pre-stressed tendon by using a special stretching-drawing tool, so that a small retraction quantity of the pre-stressed tendon can be obtained; thus, the problems of easy produce of diagonal cracks, great loss of effective and permanent pre-stress of pre-stressed steel strands, low utilization rate of the pre-stressed tendon when a main stretching stress exceeds a limit value which is regulated by the specification in the traditional anchoring process are effectively solved.
Description
Technical Field
The invention relates to the technical field of prestressed concrete member manufacturing, in particular to a low-retraction prestressed anchorage device comprising medium and short prestressed tendons, a stress applying method and a stress applying tool.
Background
In recent years, with the development of highway and railway construction, the prestressed anchorage device is also well applied; in actual engineering construction, if the traditional clip type anchorage device is used for medium and short prestressed tendons and hardly meets the requirement of tension control stress, the problems of inclined cracks, large effective permanent prestress loss, large anchorage device retraction amount, low utilization rate of the prestressed tendons and the like caused by the fact that the main tensile stress exceeds the limit value specified by the specification exist. In order to solve the problems, a research subject of tensioning and anchoring of a post-tensioning method small-tonnage short prestressed tendon is provided.
Disclosure of Invention
The invention provides a low-retraction prestressed anchorage device, a stress application method and a stress application tool, which can solve the problems of excessive stress application and low utilization rate of prestressed tendons in the manufacturing process of prestressed concrete members of medium and short prestressed tendons.
In order to solve the technical problems, the technical scheme of the method for applying the stress to the low-retraction prestressed concrete member adopted by the invention is as follows: the concrete member comprises a prefabricated concrete member, wherein a prestressed tendon with one end anchored in the concrete member is arranged in a prestressed tendon hole of the concrete member:
A. the concrete member is provided with an anchor backing plate embedded in the prestressed tendon stretching end of the prestressed tendon hole;
B. clamping a prestressed tendon at a tensioning end in a tapered hole of an anchor plate through a clamping piece with a tapered surface on the outer side, wherein the anchor plate is arranged in a threaded hole of a nut through threads;
C. stretching for the first time: clamping the prestressed tendon by using a tensioning tool, jacking the tensioning tool on a limiting plate at the large end of the clamping piece through a limiting jacking cylinder, starting the tensioning tool of the prestressed tendon to tension the prestressed tendon, and releasing the load of the tensioning tool after the compressive stress on the concrete member reaches a set value and is kept stable for a certain time so that the clamping piece enters the anchor plate along with the retracted prestressed tendon for anchoring;
D. tensioning for the second time: after the tensioning is carried out for one time, the tensioning tool is used for clamping the prestressed tendon, the tensioning tool is jacked on the prestressed tendon of the anchor backing plate, the prestressed tendon is pulled out along with the anchor plate and the clamping piece in the anchor plate, so that the compressive stress on the concrete member reaches a set value, the nut is driven to rotate after the compressive stress is kept stable for a certain time, the nut is pressed and connected on the anchor backing plate in a pressing mode, and then the tensioning tool is released; completing the application of the stress to the prestressed concrete member after the second tensioning;
wherein,
the tensioning tool is provided with a tensioning jack, the front end of the tensioning jack is connected with a supporting leg, a nut sleeve is arranged in the supporting leg, a limiting jacking cylinder is arranged in the nut sleeve, the supporting leg is provided with a jacking surface for applying pressure to the pressure bearing surface of the limiting jacking cylinder, one side of the supporting leg on the jacking surface is provided with a yielding groove for the pressure bearing surface of the limiting jacking cylinder to retract backwards, and the limiting jacking cylinder is provided with a telescopic control handle extending out of the supporting leg; the nut sleeve is provided with a rotary driving handle extending out of the supporting leg; in the step C, the limit top pressure barrel is driven to rotate by the telescopic control handle, the limit top pressure barrel extends forwards, the pressure bearing surface of the limit top pressure barrel is rotated to be aligned with the top pressure surface of the supporting leg, and the tensioning jack is started to tension the prestressed tendon for the first time only when the front end of the limit top pressure barrel is pressed on the limit plate of the clamping piece; in the step D, the telescopic control handle drives the limiting jacking cylinder to rotate, the pressure bearing surface of the limiting jacking cylinder rotates to a yielding groove aligned with the supporting leg, the front end of the supporting leg is jacked on the anchor backing plate, and the tensioning jack is started to tension the prestressed tendon for the second time; the driving nut is rotated by rotating the driving handle, and the nut is driven to rotate by the rotating driving handle through the nut sleeve; the tensioning jack can be a cylinder barrel, the front end of the cylinder barrel is provided with a through hole, and the front end of the cylinder barrel is hermetically connected with a penetrating sleeve with an inner hole communicated with the through hole; a hollow piston rod with the outer end extending out of the cylinder barrel is arranged between the cylinder barrel and the feed-through sleeve, and the outer end of the piston rod is provided with a tool anchor plate for clamping the prestressed tendon and a tool clamping piece arranged in a taper hole of the tool anchor plate.
The technical scheme of the tool for the method for applying the stress to the low-retraction prestressed concrete member provided by the invention is as follows: the support leg is provided with a yielding groove for the pressure-bearing surface of the limit top pressure cylinder to retract backwards, and the limit top pressure cylinder is provided with a telescopic control handle extending out of the support leg; the nut sleeve is provided with a rotary driving handle extending out of the supporting leg; the tensioning jack is provided with a cylinder barrel, the front end of the cylinder barrel is provided with a through hole, and the front end of the cylinder barrel is hermetically connected with a penetrating sleeve with an inner hole communicated with the through hole; a hollow piston rod with the outer end extending out of the cylinder barrel is arranged between the cylinder barrel and the feed-through sleeve, and the outer end of the piston rod is provided with a tool anchor plate for clamping the prestressed tendon and a tool clamping piece arranged in a taper hole of the tool anchor plate.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. because the anchor plate at the tensioning end is arranged in the threaded hole of the nut, the stretching extension of the prestressed tendon is compensated through the adjustment of the nut, so that the effect that the retraction amount is very small after the prestressed tendon is tensioned and applied with force for the second time can be obtained, the structure of the anchorage device at the tensioning end can be compact, the size of the appearance structure is small, and the size of the reserved notch for the anchorage device at the tensioning end can be greatly reduced.
2. Because the retraction amount of the prestressed tendon after being tensioned and applied with force is very small, the control can be within 1 mm, and the effective permanent prestress loss of the prestressed tendon is greatly reduced.
3. Because the retraction amount of the prestressed reinforcement after tension force application is very small, the prestressed concrete inclined crack caused by overhigh first tension stress can be avoided.
4. Because the retraction amount of the tendon after tension force application is very small, the utilization rate of the prestressed tendon of the whole set of anchorage can be improved.
Drawings
FIG. 1 is a cross-sectional view showing the structure of a first embodiment of a low-shrinkage prestressed concrete structure.
Fig. 2 is a front view of the anchor plate of fig. 1 with the tendon stretching the anchored end.
Fig. 3 is a top view of the anchor plate of fig. 1 with the tendon stretching the anchored end.
Fig. 4 is a front view of one of the forms of the nut of fig. 1.
Fig. 5 is a top view of one of the nut forms of fig. 1.
Fig. 6 is a front view of a second form of the nut of fig. 1.
Fig. 7 is a top view of a second form of the nut of fig. 1.
FIG. 8 is a sectional view showing the structure of a second embodiment of a low-shrinkage prestressed concrete structure.
Fig. 9 is a schematic view of the first tensioning of the tendon in the stress applying method of the low-shrinkage prestressed concrete member.
Fig. 10 is a partial enlarged view at B in fig. 9.
Fig. 11 is a front view of the support foot of fig. 9.
FIG. 12 is a cross-sectional view taken at A-A in FIG. 11
FIG. 13 is a front view of one of the nut-socket forms of FIG. 9.
FIG. 14 is a left side view of one of the nut-socket forms of FIG. 9.
Figure 15 is a front view of a second nut socket form of figure 9.
FIG. 16 is a left side view of a second nut socket form of FIG. 9.
Fig. 17 is a front view of the restraining press cylinder of fig. 9.
Fig. 18 is a left side view of the restraining press cylinder of fig. 9.
Fig. 19 is a schematic view of the stress application method of the low-shrinkage prestressed concrete member at the end of the second tensioning of the tendon.
Fig. 20 is a partial enlarged view at C in fig. 19.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
fig. 1 shows a low-retraction prestressed concrete member for railway bridges and culverts, which comprises a prefabricated concrete member 1, wherein a corrugated pipe 3 for penetrating prestressed tendons 2 is pre-embedded in the concrete member 1, and a plurality of prestressed tendons 2 are penetrated in the corrugated pipe 3.
The left end of the concrete member 1 is a fixed anchoring end of the prestressed tendon 2, an anchor backing plate 25 and a metal spiral tendon 5 arranged outside the anchor backing plate 25 are pre-embedded in the concrete member 1 at the left end, an anchor plate 26 is arranged outside the anchor backing plate, the left end of each prestressed tendon 2 is respectively arranged in one of the conical holes of the anchor plate 26 in a penetrating manner, and is clamped and fixed by two clamping pieces 15 of the conical surface corresponding to the wall of the conical hole and the outer side surfaces of the conical holes.
The right end of the concrete member 1 is a tension anchoring end of a prestressed tendon 2, an anchor backing plate 4 and a metal spiral tendon 5 arranged outside the anchor backing plate 4 are embedded in the concrete member 1 at the end, the prestressed tendon 2 at the end is clamped and fixed in the anchor plate 6 through a plurality of clamping pieces 15 arranged in tapered holes of the anchor plate 6 shown in figures 2 and 3 respectively, the anchor plate is arranged in threaded holes of a nut 7 shown in figures 4 and 5 or figures 6 and 7 through outer side threads of the anchor plate, the threads of the nut 7 are triangular threads with an angle of 60 degrees, the nut 7 is pressed on the anchor backing plate 4, and the outer side surface of a clamping part of the nut 7 is surrounded by a plurality of planes or is provided with a plurality of grooves so as to be convenient for clamping and driving of a clamping tool.
Fig. 8 shows a low-retraction prestressed concrete structure for highway bridging, which comprises a prefabricated concrete structure 1, the left end of which is a fixed anchoring end of a prestressed tendon 2, a compression sleeve 10 between the compression sleeve 8 and a backing plate 9, a compression anchor formed by a compression spring 11 arranged in an inner hole of the compression sleeve 10, a compression spring 11 connecting the compression sleeve 8 and the backing plate 9, and a bolt 12 and a nut 15 connecting the compression sleeve 8 and the backing plate 9 are embedded in the concrete structure 1 at the end, each compression sleeve 10 holds one prestressed tendon 2 through the compression spring 11, each prestressed tendon 2 penetrates through a restraint ring 13 embedded in the concrete structure 1 in the compression anchor, a metal spiral tendon 5 is embedded in the concrete structure 1 outside the restraint ring 13, the prestressed tendon 2 penetrates through a plastic corrugated pipe 3 in part of the concrete structure 1, and a grouting pipe 14 for pouring concrete slurry into the corrugated pipe 3 is further arranged, these parts are prior art.
The right end of the low-retraction prestressed concrete member shown in fig. 8 is a tension anchoring end of the prestressed tendon 2, and the structure of the end is completely the same as that of the tension anchoring end of the embodiment shown in fig. 1.
The method for applying stress to the low-retraction prestressed concrete member shown in fig. 1 and 8 is shown in fig. 9:
as shown in fig. 9 and 10, the tendon 2 at the tensioning end is clamped in the taper hole of the anchor plate 6 through the clamping piece 15 with a tapered surface at the outer side, and the anchor plate 6 is installed in the threaded hole of the nut 7 through threads; a special tensioning tool is used, the tensioning tool comprises a tensioning jack which is the prior art and comprises a cylinder barrel, the front end of the cylinder barrel is provided with a through hole, the front end of the cylinder barrel is hermetically connected with a penetrating sleeve, the inner hole of the penetrating sleeve is communicated with the through hole at the front end of the cylinder barrel, a hollow piston rod is arranged between the cylinder barrel and the penetrating sleeve, the outer end of the piston rod extends out of the cylinder barrel, the outer end of the piston rod is provided with a tool anchor plate 18 for clamping a prestressed tendon 2 and a tool clamping piece 24 arranged in a taper hole of the tool anchor plate, the front end of the tensioning jack is connected with a supporting leg 19 shown in figures 11 and 12 through a screw, the supporting leg 19 is a barrel structure provided with an axial groove and a groove-directional groove, and a nut sleeve 16 shown in figures 13 and 14 is arranged in the supporting leg 19 (the nut of the embodiment is shown in figures 4 and 5; if the nut is adopted as shown in, Fig. 7 shows the structure, the nut sleeve will adopt the structure shown in fig. 15 and 16) a limit top pressure cylinder 17 as shown in fig. 17 and 18 is arranged in the nut sleeve 16, the rear end of the limit top pressure cylinder 17 is provided with pressure parts protruding radially at two sides of the cylindrical base body, the rear end surface of the pressure part is a pressure bearing surface, a spigot pressing the pressure bearing surface of the limit top pressure cylinder 17 is arranged in a supporting leg 19 as a top pressure surface, an axial groove of the supporting leg 19 at one side of the top pressure surface is a yielding groove for the pressure bearing surface of the limit top pressure cylinder 17 to retract backwards, and the limit top pressure cylinder 17 is connected with a telescopic control handle 22 extending out of the supporting leg; the nut socket 16 is connected to a rotary drive handle 23 which extends outside the support foot 19.
When the tensioning tool is used for pulling and applying force to the prestressed tendon 2 for the first time, the telescopic control handle 22 drives the limiting jacking cylinder 17 to rotate, the limiting jacking cylinder 17 extends forwards, the pressure bearing surface of the limiting jacking cylinder is rotated to be aligned with the jacking surface of the supporting leg 19, the front end of the limiting jacking cylinder 17 is jacked on the limiting plate 27, the limiting plate 27 is jacked on the large-head end surface of the clamping piece 15, the right end of the prestressed tendon 2 is clamped and fixed in the conical hole of the tool anchor plate by the tool clamping piece 24 and then fixed, the tensioning tool is filled with oil into the tensioning jack through a hydraulic system to start the tensioning tool to perform the first time on the prestressed tendon 2, the tensioning pressure on the concrete member 1 is made to reach a set value, the tensioning pressure is kept for 2 minutes to be stable, the load of the tensioning tool is released, and the prestressed tendon 2 retracted along with the clamping piece enters the anchor plate; after the force application of the first main stretching is released, the second stretching is carried out: the limit jacking cylinder 17 is driven to rotate by the telescopic control handle 22, the bearing surface of the limit jacking cylinder 17 is rotated to a receding groove aligned with the supporting leg 19, the front end of the supporting leg 19 is jacked on the anchor backing plate 4, the tensioning tool is started to perform second tensioning on the prestressed tendon 2 by injecting oil into the tensioning jack through a hydraulic system, the anchor plate 4 clamping the prestressed tendon 2 and the clamping piece 15 in the anchor plate are pulled out backwards along with the prestressed tendon 2, the compressive stress on the concrete member 2 reaches a set value, and after the compressive stress is kept for 2 minutes and is stabilized, the nut 7 is driven to rotate by rotating the driving handle 23 through the nut sleeve 16 by rotating the driving handle 23, so that the nut 7 is pressed on the anchor backing plate 4, as shown in fig. 19 and 20, the load of the tensioning tool is finally released, and the prestressed concrete member is stressed by fixing the prestressed tendon 2 and the anchor plate 6 on the anchor backing plate 4 only by slight retraction.
Claims (3)
1. A low-retraction prestressed concrete member stress applying method comprises the steps of prefabricating a concrete member, wherein a prestressed tendon with one end anchored in the concrete member is arranged in a prestressed tendon hole of the concrete member, and the method is characterized in that:
A. the concrete member is provided with an anchor backing plate embedded in the prestressed tendon stretching end of the prestressed tendon hole;
B. clamping a prestressed tendon at a tensioning end in a tapered hole of an anchor plate through a clamping piece with a tapered surface on the outer side, wherein the anchor plate is arranged in a threaded hole of a nut through threads;
C. stretching for the first time: clamping the prestressed tendon by using a tensioning tool, jacking the tensioning tool on a limiting plate at the large end of the clamping piece through a limiting jacking cylinder, starting the tensioning tool of the prestressed tendon to tension the prestressed tendon, and releasing the load of the tensioning tool after the compressive stress on the concrete member reaches a set value and is kept stable for a certain time so that the clamping piece enters the anchor plate along with the retracted prestressed tendon for anchoring;
D. tensioning for the second time: after the tensioning is carried out for one time, the tensioning tool is used for clamping the prestressed tendon, the tensioning tool is jacked on the prestressed tendon of the anchor backing plate, the prestressed tendon is pulled out along with the anchor plate and the clamping piece in the anchor plate, so that the compressive stress on the concrete member reaches a set value, the nut is driven to rotate after the compressive stress is kept stable for a certain time, the nut is pressed and connected on the anchor backing plate in a pressing mode, and then the tensioning tool is released; completing the application of the stress to the prestressed concrete member after the second tensioning;
wherein:
the tensioning tool is provided with a tensioning jack, the front end of the tensioning jack is connected with a supporting leg, a nut sleeve is arranged in the supporting leg, a limiting jacking cylinder is arranged in the nut sleeve, the supporting leg is provided with a jacking surface for applying pressure to the pressure bearing surface of the limiting jacking cylinder, one side of the supporting leg on the jacking surface is provided with a yielding groove for the pressure bearing surface of the limiting jacking cylinder to retract backwards, and the limiting jacking cylinder is provided with a telescopic control handle extending out of the supporting leg; the nut sleeve is provided with a rotary driving handle extending out of the supporting leg;
in the step C, the limit top pressure barrel is driven to rotate by the telescopic control handle, the limit top pressure barrel extends forwards, the pressure bearing surface of the limit top pressure barrel is rotated to be aligned with the top pressure surface of the supporting leg, and the tensioning jack is started to tension the prestressed tendon for the first time only when the front end of the limit top pressure barrel is pressed on the limit plate of the clamping piece;
in the step D, the telescopic control handle drives the limiting jacking cylinder to rotate, the pressure bearing surface of the limiting jacking cylinder rotates to a yielding groove aligned with the supporting leg, the front end of the supporting leg is jacked on the anchor backing plate, and the tensioning jack is started to tension the prestressed tendon for the second time; the driving nut is rotated by rotating the driving handle, and the nut is driven to rotate by the rotating driving handle through the nut sleeve.
2. The method for applying stress to a low-shrinkage prestressed concrete structure according to claim 1, characterized in that: the tensioning jack is provided with a cylinder barrel, the front end of the cylinder barrel is provided with a through hole, and the front end of the cylinder barrel is hermetically connected with a penetrating sleeve with an inner hole communicated with the through hole; a hollow piston rod with the outer end extending out of the cylinder barrel is arranged between the cylinder barrel and the feed-through sleeve, and the outer end of the piston rod is provided with a tool anchor plate for clamping the prestressed tendon and a tool clamping piece arranged in a taper hole of the tool anchor plate.
3. A tool for a method of applying stress to a low-shrinkage prestressed concrete structure, characterized in that: the support leg is provided with a yielding groove for the pressure-bearing surface of the limit top pressure cylinder to retract backwards, and the limit top pressure cylinder is provided with a telescopic control handle extending out of the support leg; the nut sleeve is provided with a rotary driving handle extending out of the supporting leg; the tensioning jack is provided with a cylinder barrel, the front end of the cylinder barrel is provided with a through hole, and the front end of the cylinder barrel is hermetically connected with a penetrating sleeve with an inner hole communicated with the through hole; a hollow piston rod with the outer end extending out of the cylinder barrel is arranged between the cylinder barrel and the feed-through sleeve, and the outer end of the piston rod is provided with a tool anchor plate for clamping the prestressed tendon and a tool clamping piece arranged in a taper hole of the tool anchor plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210444795.6A CN102912987B (en) | 2012-11-09 | 2012-11-09 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210444795.6A CN102912987B (en) | 2012-11-09 | 2012-11-09 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
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| Publication Number | Publication Date |
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| CN102912987A CN102912987A (en) | 2013-02-06 |
| CN102912987B true CN102912987B (en) | 2014-12-24 |
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| CN201210444795.6A Expired - Fee Related CN102912987B (en) | 2012-11-09 | 2012-11-09 | Stress applying method and tool thereof for low retraction pre-stress concrete member |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239511B (en) * | 2015-09-09 | 2017-02-22 | 重庆工商职业学院 | Steel strand tension device |
| CN105841577B (en) * | 2016-03-23 | 2018-08-21 | 河南省水利勘测设计研究有限公司 | The method of accurate measurement prestressing force aqueduct circumferential direction or vertical prestressing bar amount of recovery |
| CN109750599B (en) * | 2017-11-07 | 2021-11-19 | 上海同吉建筑工程设计有限公司 | Slow-bonding low-retraction prestressed short cable system and calculation and tensioning methods |
| CN110557958A (en) * | 2018-04-03 | 2019-12-10 | 旭混凝土工业株式会社 | Connector and method for manufacturing box culvert |
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| GB1391778A (en) * | 1971-09-28 | 1975-04-23 | Pre Stress Pioneers Ltd | Anchoring and tensioning assembly for post-stressing of cable-reinforced concrete structures |
| CN2274210Y (en) * | 1996-01-25 | 1998-02-11 | 安徽省合肥交通桥梁锚具厂 | Mechanical-spacing top-squezzing device |
| CN101260741A (en) * | 2007-03-05 | 2008-09-10 | 柳州欧维姆机械股份有限公司 | Short bundle cable stretching caging device and method for stretching and anchoring |
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| GB1391778A (en) * | 1971-09-28 | 1975-04-23 | Pre Stress Pioneers Ltd | Anchoring and tensioning assembly for post-stressing of cable-reinforced concrete structures |
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| JP2008285975A (en) * | 2007-05-21 | 2008-11-27 | Sumitomo Denko Steel Wire Kk | Inner side nut assembly, anticorrosive pc steel bar assembly body, and pc structural body |
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Granted publication date: 20141224 Termination date: 20171109 |