CN214082061U - Pretensioning method precast concrete roof beam top flange prestressed tendons puts a device - Google Patents
Pretensioning method precast concrete roof beam top flange prestressed tendons puts a device Download PDFInfo
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- CN214082061U CN214082061U CN202022863421.0U CN202022863421U CN214082061U CN 214082061 U CN214082061 U CN 214082061U CN 202022863421 U CN202022863421 U CN 202022863421U CN 214082061 U CN214082061 U CN 214082061U
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Abstract
The application relates to a pretensioning method precast concrete roof beam top flange prestressing tendons puts a device belongs to bridge prestressing force construction technical field, includes: the anchoring unit comprises a tension counter-force beam and a steel backing plate welded on the tension counter-force beam, wherein an anchorage device for anchoring a prestressed tendon is arranged at one end, far away from the tension counter-force beam, of the steel backing plate, and a U-shaped clamping plate is arranged between the anchorage device and the steel backing plate; the tension releasing unit comprises a tension releasing base welded on the tension counterforce beam, a tension supporting foot is fixedly connected onto the tension releasing base, a through hole penetrating the prestressed tendon is formed in the tension supporting foot, and the tail end of the tension supporting foot is provided with tension equipment for releasing the prestressed tendon step by step. When this application was put a to prestressing tendons, tensioning equipment only need stretch-draw prestressing tendons to design tension force, then demolish the U-shaped cardboard. The tension force required by the prestressed tendon relaxation does not need to exceed the force applied during stretching, and the risk of rupture of the prestressed tendon due to overlarge stress is fundamentally avoided.
Description
Technical Field
The application relates to the technical field of bridge prestress construction, in particular to a pre-tensioning method precast concrete beam upper flange prestressed tendon tension releasing device.
Background
With the technical development of composite beams, steel structure-concrete composite beams and concrete-concrete composite beams are increasingly applied. The concrete-concrete composite beam is mainly prefabricated by a bottom web, and then integrally cast in situ with a bridge deck after erection. Under the general condition, a plurality of prestressed tendons positioned on the bottom plate of the beam body are integrally tensioned, and the prestressed tendons positioned on the upper flange of the beam body are tensioned by a single prestressed tendon.
The prestress technology is an effective way for improving the crack resistance of the concrete member, and compressive stress is applied to a tensile area of the concrete member in advance before the concrete member bears external load, so that the tensile stress generated by the external load can be partially or completely counteracted, and the occurrence of cracks is delayed or avoided. The method of tensioning the tendon before the concrete is poured is called the pretensioned method.
In the related technology, the releasing and tensioning method of the single-beam prestressed tendon of the precast concrete beam often cannot control the releasing and tensioning speed and is difficult to realize stable and controllable releasing and tensioning, so that the beam body prestress is unevenly applied or the beam body concrete is damaged due to sudden releasing and tensioning. And because the length that the beam body exposes the steel strand wires is less after the beam body concreting, prestressing tendons warp and is difficult to satisfy when the design tensile force and put a demand, and the required pulling force of putting a demand must be greater than the power of exerting during stretch-draw and just can demolish the ground tackle, has certain steel strand wires fracture and damages the risk of beam body concrete around.
Disclosure of Invention
The embodiment of the application provides a pretensioning device for prestressed tendons on an upper flange of a precast concrete beam by using a pretensioning method, and aims to solve the problems that in the prior art, the anchorage device can be detached only by applying force when tension force required by the prestressed tendons is required to be greater than that of tension force, certain steel strands break and concrete of a beam body around is damaged.
The embodiment of the application provides a device is put to pretensioning method precast concrete roof beam top flange prestressing tendons includes:
the anchoring unit comprises a tension counter-force beam and a steel backing plate welded on the tension counter-force beam, an anchorage device for anchoring a prestressed tendon is arranged at one end, far away from the tension counter-force beam, of the steel backing plate, and a U-shaped clamping plate is arranged between the anchorage device and the steel backing plate;
put a unit, put a unit including the welding put a base on the stretch-draw counter-force roof beam, put fixedly connected with stretch-draw spike on the base, set up the through-hole that penetrates the prestressing tendons on the stretch-draw spike, the end of stretch-draw spike is equipped with and puts a stage by stage the stretch-draw equipment of prestressing tendons.
In some embodiments: the steel backing plate is a wedge-shaped plate with the thickness gradually increasing from one end to the other end, and a through hole penetrating the prestressed tendon is formed in the steel backing plate;
the U-shaped clamping plate is a wedge-shaped plate with the thickness gradually reduced from one end to the other end, and a U-shaped clamping groove penetrating into the prestressed tendon is formed in the U-shaped clamping plate.
In some embodiments: and a U-shaped handle is fixedly arranged at one end of the U-shaped clamping plate, which is far away from the U-shaped clamping groove.
In some embodiments: the tension releasing base comprises two angle steels symmetrically arranged along the axis of the prestressed tendon, and the two angle steels are vertically welded and connected with the tension counterforce beam.
In some embodiments: the tensioning supporting foot comprises a left side plate and a right side plate which are parallel to each other and arranged at intervals, and a front end plate and a rear end plate which are parallel to each other and arranged at intervals are fixedly connected between the left side plate and the right side plate;
the front end plate and the rear end plate are provided with through holes penetrating the prestressed tendons, and the diameter of each through hole is larger than the outer diameter of the anchorage device.
In some embodiments: the left side board and the right side board are close to one end of the steel base plate and are abutted against the steel base plate, the front end board is close to the steel base plate, and a gap for accommodating the U-shaped clamping plate is formed between the front end board and the steel base plate.
In some embodiments: the bottom of steel backing plate is equipped with the joint and is in the locating plate between left side board and the right side board, the length of locating plate with the interval between left side board and the right side board is the same.
In some embodiments: the tensioning equipment is a feed-through hydraulic jack, and the prestressed tendon penetrates into the feed-through hydraulic jack and is anchored with the feed-through hydraulic jack.
In some embodiments: and lubricating grease is coated on the contact surface between the U-shaped clamping plate and the anchorage device and between the U-shaped clamping plate and the steel backing plate.
In some embodiments: the prestressed tendons are steel strands or steel bars.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a pre-tensioning method precast concrete beam upper flange prestressed tendon tension releasing device, and the prestressed tendon tension releasing device is provided with an anchoring unit, wherein the anchoring unit comprises a tension counter-force beam and a steel backing plate welded on the tension counter-force beam, one end, far away from the tension counter-force beam, of the steel backing plate is provided with an anchorage device for anchoring a prestressed tendon, and a U-shaped clamping plate is arranged between the anchorage device and the steel backing plate; the tension releasing unit comprises a tension releasing base welded on the tension counterforce beam, a tension supporting foot is fixedly connected to the tension releasing base, a through hole penetrating the prestressed tendon is formed in the tension supporting foot, and the tail end of the tension supporting foot is provided with tension equipment for releasing the prestressed tendon step by step.
Therefore, this application is through welding the steel backing plate on stretch-draw reaction beam in advance before prestressing tendons stretch-draw, but installs the U-shaped cardboard that pulls out between ground tackle and steel backing plate. When a single prestressed tendon is released, the tensioning equipment only needs to stretch the prestressed tendon to the designed tensioning force, then the U-shaped clamping plate is detached, then the prestressed tendon can be gradually released according to the preset stage, the releasing and tensioning process speed is controllable, and the safety of the structure and the operation is effectively improved. The tension force required by the prestressed tendon relaxation does not need to exceed the force applied during stretching, and the risk of rupture of the prestressed tendon due to overlarge stress is fundamentally avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present application;
fig. 2 is an exploded view of the structure of the embodiment of the present application.
Reference numerals:
1. a base is placed; 2. a steel backing plate; 3. stretching the supporting feet; 4. tensioning equipment; 5. a U-shaped clamping plate; 6. an anchorage device; 7. tensioning the counter-force beam; 8. and (4) prestressed tendons.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a pretensioning device for prestressed tendons on an upper flange of a precast concrete beam by using a pretensioning method, and the device can solve the problems that in the prior art, the anchorage device can be detached only by applying force when tension force required by the prestressed tendons is required to be greater than that of tension force, certain steel strands break and concrete of a surrounding beam body is damaged.
Referring to fig. 1 and 2, an embodiment of the present application provides a pretensioning device for a prestressed tendon on an upper flange of a precast concrete beam, including:
the anchoring unit comprises a tension counter-force beam 7 and a steel backing plate 2 welded on the tension counter-force beam 7, an anchorage device 6 for anchoring a prestressed tendon 8 is arranged at one end, far away from the tension counter-force beam 7, of the steel backing plate 2, and a U-shaped clamping plate 5 is arranged between the anchorage device 6 and the steel backing plate 2.
The releasing and tensioning unit comprises a releasing and tensioning base 1 welded on the tensioning counterforce beam 7, and the top of the releasing and tensioning base 1 is fixedly connected with a tensioning supporting leg 3; the stretching supporting feet 3 are provided with through holes for penetrating the prestressed tendons 8, and the tail ends of the stretching supporting feet 3 are provided with stretching equipment 4 for gradually releasing the prestressed tendons 8.
This application is through welding steel backing plate 2 on stretch-draw reaction roof beam 7 in advance before 8 stretch-draws of prestressing tendons, but installs the U-shaped cardboard 5 that can pull out between ground tackle 6 and steel backing plate 2. When a single prestressed tendon 8 is released, the tensioning equipment 4 only needs to stretch the prestressed tendon 8 to the designed tension force, so that the pressure between the U-shaped clamping plate 5 and the steel backing plate 2 is 0MPa, and then the U-shaped clamping plate 5 is detached.
And then the tension device 4 can gradually release the tension according to the preset stage, the speed of the tension releasing process is controllable, and the safety of the structure and the operation is effectively improved. The tension required by the prestressed tendon 8 to be released does not need to exceed the force applied during tensioning, and the risk of breakage of the prestressed tendon due to overlarge stress is fundamentally avoided.
In some alternative embodiments: referring to fig. 1 and 2, the embodiment of the application provides a pretensioning device for a prestressed tendon on an upper flange of a precast concrete beam, a steel base plate 2 of the pretensioning device for the prestressed tendon is a wedge-shaped plate with the thickness gradually increasing from one end to the other end, and a through hole penetrating into a prestressed tendon 8 is formed in the steel base plate 2.
The U-shaped clamping plate 5 is a wedge-shaped plate with the thickness gradually reduced from one end to the other end, and a U-shaped clamping groove for penetrating the prestressed tendon 8 is formed in the U-shaped clamping plate 5. And a U-shaped handle is fixedly arranged at one end of the U-shaped clamping plate 5, which is far away from the U-shaped clamping groove, and the U-shaped handle is used for facilitating the insertion and extraction of the U-shaped clamping plate 5. The contact surface between the U-shaped clamping plate 5 and the anchorage device 6 and the steel backing plate 2 is coated with lubricating grease.
When the U-shaped clamping plate 5 is attached to the steel base plate 2, the wedge-shaped surface of the U-shaped clamping plate 5 is attached to the wedge-shaped surface of the steel base plate 2. When the tensioning equipment 4 releases the prestressed tendons 8, the U-shaped clamping plate 5 can be quickly pulled out under the guiding action of the wedge-shaped surface of the U-shaped clamping plate 5 and the wedge-shaped surface of the steel base plate 2, and the hidden danger that the prestressed tendons 8 are excessively tensioned by the tensioning equipment 4 and are broken due to excessive stress is avoided.
In some alternative embodiments: referring to fig. 1 and 2, the embodiment of the application provides a pre-tensioning method precast concrete beam upper flange prestressed tendon tensioning device, a tensioning base 1 of the prestressed tendon tensioning device comprises two angle steels symmetrically arranged along the axis of a prestressed tendon 8, and the two angle steels are vertically welded and connected with a tensioning counterforce beam 7. The two angle steels are consistent in height, the tension base 1 is made of the two angle steels, on-site material taking and on-site processing and manufacturing are facilitated, manufacturing cost is low, and construction efficiency is improved.
In some alternative embodiments: referring to fig. 1 and 2, the embodiment of the present application provides a pretensioning device for a pretensioning type precast concrete beam top flange prestressed tendons, where a tensioning brace 3 of the pretensioning device for the prestressed tendons includes a left side plate and a right side plate that are parallel to each other and are arranged at intervals, and a front end plate and a rear end plate that are parallel to each other and are arranged at intervals are fixedly connected between the left side plate and the right side plate. Set up the through-hole that penetrates prestressed tendon 8 on front end plate and rear end plate, the diameter of this through-hole is greater than the external diameter of ground tackle 6, and ground tackle 6 can stretch into in the through-hole, prevents to be unfavorable for stretch-draw equipment 4 stretch-draw prestressed tendon 8 behind ground tackle 6 and the front end plate butt.
One end of the left side plate and the right side plate of the tensioning supporting foot 3, which are close to the steel backing plate 2, are abutted against the steel backing plate 2, the front end plate of the tensioning supporting foot 3 is close to the steel backing plate 2, and a gap for accommodating the U-shaped clamping plate 5 is arranged between the front end plate and the steel backing plate 2. When the tensioning equipment 4 stretches the prestressed tendons 8, the reaction force of the tensioning equipment 4 acts on the left side plate and the right side plate of the tensioning supporting foot 3, and the reaction force of the tensioning equipment 4 finally acts on the tensioning reaction force beam 7 by abutting the left side plate and the right side plate of the tensioning supporting foot 3 with the steel backing plate 2.
The bottom of the steel backing plate 2 is provided with a positioning plate which is clamped between the left side plate and the right side plate, and the length of the positioning plate is the same as the distance between the left side plate and the right side plate. The positioning plate is used for realizing the accurate positioning of the steel base plate 2 and the tensioning supporting feet 3 and preventing the prestressed tendons 8 from receiving radial shearing force.
In some alternative embodiments: referring to fig. 1 and 2, the embodiment of the present application provides a pretensioning device for a prestressed tendon on an upper flange of a precast concrete beam by using a pretensioning method, a tensioning device 4 of the pretensioning device for the prestressed tendon is a through hydraulic jack, and a prestressed tendon 8 penetrates into the through hydraulic jack and is anchored with the through hydraulic jack. The feed-through hydraulic jack can realize quantitative and graded feeding and opening, can stop at any time in the feeding and opening process, can predesign the feeding and opening stage, and overcomes the defect that the traditional method is uncontrollable. The prestressed tendons 8 are steel strands or steel bars.
Principle of operation
The embodiment of the application provides a pre-tensioning method precast concrete beam upper flange prestressed tendon tension releasing device, and the prestressed tendon tension releasing device is provided with an anchoring unit, wherein the anchoring unit comprises a tension counter-force beam 7 and a steel backing plate 2 welded on the tension counter-force beam 7, one end, far away from the tension counter-force beam 7, of the steel backing plate 2 is provided with an anchorage device 6 for anchoring a prestressed tendon 8, and a U-shaped clamping plate 5 is arranged between the anchorage device 6 and the steel backing plate 2; the tension releasing unit comprises a tension releasing base 1 welded on a tension counterforce beam 7, a tension supporting foot 3 fixedly connected to the tension releasing base 1 is arranged on the tension supporting foot 3, a through hole penetrating a prestressed tendon 8 is formed in the tension supporting foot 3, and the tail end of the tension supporting foot 3 is provided with a tension device 4 for gradually releasing the prestressed tendon 8.
This application is through welding steel backing plate 2 on stretch-draw reaction roof beam 7 in advance before 8 stretch-draws of prestressing tendons, but installs the U-shaped cardboard 5 that can pull out between ground tackle 6 and steel backing plate 2. When a single prestressed tendon 8 is placed, the tensioning equipment 4 only needs to stretch the prestressed tendon 8 to the designed tensioning force, then the U-shaped clamping plate 5 is detached, then the prestressed tendon can be gradually placed according to the preset stage, the speed of the placing process is controllable, and the safety of the structure and the operation is effectively improved. The tension required by the prestressed tendon 8 to be released does not need to exceed the force applied during tensioning, and the risk of breakage of the prestressed tendon 8 due to overlarge stress is fundamentally avoided.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a pretensioning method precast concrete roof beam top flange prestressing tendons puts a device which characterized in that includes:
the anchoring unit comprises a tension counter-force beam (7) and a steel backing plate (2) welded on the tension counter-force beam (7), an anchorage device for anchoring a prestressed tendon (8) is arranged at one end, far away from the tension counter-force beam (7), of the steel backing plate (2), and a U-shaped clamping plate (5) is arranged between the anchorage device (6) and the steel backing plate (2);
put a unit, put a unit including the welding put a base (1) on stretch-draw counter-force roof beam (7), put fixedly connected with stretch-draw spike (3) on a base (1), set up the through-hole that penetrates prestressing tendons (8) on the stretch-draw spike (3), the end of stretch-draw spike (3) is equipped with and puts a stage by stage stretch equipment (4) of prestressing tendons (8).
2. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the steel backing plate (2) is a wedge-shaped plate with the thickness gradually increasing from one end to the other end, and a through hole penetrating into the prestressed tendon (8) is formed in the steel backing plate (2);
the U-shaped clamping plate (5) is a wedge-shaped plate with the thickness gradually reduced from one end to the other end, and a U-shaped clamping groove penetrating into the prestressed tendon (8) is formed in the U-shaped clamping plate (5).
3. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 2, wherein:
and a U-shaped handle is fixedly arranged at one end of the U-shaped clamping plate (5) far away from the U-shaped clamping groove.
4. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the tension releasing base (1) comprises two angle steels symmetrically arranged along the axis of the prestressed tendon (8), and the two angle steels are vertically welded and connected with the tension counterforce beam (7).
5. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the tensioning supporting foot (3) comprises a left side plate and a right side plate which are parallel to each other and are arranged at intervals, and a front end plate and a rear end plate which are parallel to each other and are arranged at intervals are fixedly connected between the left side plate and the right side plate;
the front end plate and the rear end plate are provided with through holes penetrating into the prestressed tendons (8), and the diameter of each through hole is larger than the outer diameter of the anchorage device (6).
6. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 5, wherein:
the left side board and the right side board are close to the one end of steel backing plate (2) with steel backing plate (2) butt, the front end plate is close to steel backing plate (2), be equipped with between front end plate and the steel backing plate (2) and hold the clearance of U-shaped cardboard (5).
7. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 6, wherein:
the bottom of steel backing plate (2) is equipped with the joint and is in the locating plate between left side board and the right side board, the length of locating plate with the interval between left side board and the right side board is the same.
8. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the tensioning equipment (4) is a through hydraulic jack, and the prestressed tendon (8) penetrates into the through hydraulic jack and is anchored with the through hydraulic jack.
9. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the contact surface between the U-shaped clamping plate (5) and the anchorage device (6) and the steel backing plate (2) is coated with lubricating grease.
10. The pretensioning device for the prestressed tendons of the upper flange of the pretensioned precast concrete beam of claim 1, wherein:
the prestressed tendons (8) are steel strands or steel bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022863421.0U CN214082061U (en) | 2020-11-30 | 2020-11-30 | Pretensioning method precast concrete roof beam top flange prestressed tendons puts a device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022863421.0U CN214082061U (en) | 2020-11-30 | 2020-11-30 | Pretensioning method precast concrete roof beam top flange prestressed tendons puts a device |
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| Publication Number | Publication Date |
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| CN214082061U true CN214082061U (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022863421.0U Active CN214082061U (en) | 2020-11-30 | 2020-11-30 | Pretensioning method precast concrete roof beam top flange prestressed tendons puts a device |
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| CN (1) | CN214082061U (en) |
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