CN113622705A - Anchoring method for detachable prestressed carbon fiber plate - Google Patents
Anchoring method for detachable prestressed carbon fiber plate Download PDFInfo
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- CN113622705A CN113622705A CN202110959669.3A CN202110959669A CN113622705A CN 113622705 A CN113622705 A CN 113622705A CN 202110959669 A CN202110959669 A CN 202110959669A CN 113622705 A CN113622705 A CN 113622705A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
The invention discloses a detachable prestressed carbon fiber plate anchoring method, and belongs to the technical field of carbon plate reinforcement. The method comprises the steps of segmenting a fixed prestressed carbon fiber plate; applying a certain anchoring force to each prestressed carbon fiber plate section by section according to a preset direction, and unloading a tensioning tension force equivalent to the anchoring force by the jack; and repeating the operations until the tensioning tension of the jack is completely unloaded. The prestressed carbon plate is segmented, and the segmentation method is jointly determined by the total tension tonnage and the anchoring force of the steel fastener; the steel fasteners are used for anchoring, and are unloaded step by step during anchoring, so that the steel fasteners are ensured to be stressed uniformly, and only the steel fasteners and the carbon plates are reserved finally, and the influence on the appearance of the reinforced member is small; simultaneously, the tensioning anchor can be repeatedly used, and the cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of carbon plate reinforcement, and particularly relates to a detachable prestressed carbon fiber plate anchoring method.
Background
The prestressed carbon fiber plate reinforcing system is widely applied to flexural reinforcement of structural members, and the prestressed carbon fiber plate can replace steel strands to be tensioned in vitro, so that the prestressed carbon fiber plate reinforcing system has the effects of improving the bending resistance bearing capacity of the members, adjusting the stress state of the members, controlling concrete cracks and controlling the deformation of the members. The stretching anchorage of the prestressed carbon fiber plate depends on an anchoring device, and the existing anchoring systems comprise a flat plate anchorage device, a wedge-shaped anchorage device, a wave-shaped anchorage device and the like. After tensioning is finished, the jack and the stop block are removed, but the anchorage device still needs to be left on the component and cannot be detached for reuse.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems in the prior art, the invention provides a prestressed carbon fiber plate anchoring method with a detachable anchor device.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method of anchoring a detachable prestressed carbon fiber plate, comprising:
segmenting the fixed prestressed carbon fiber plate;
applying a certain anchoring force to each prestressed carbon fiber plate section by section according to a preset direction, and unloading a tensioning tension force equivalent to the anchoring force by the jack;
and repeating the operations until the tensioning tension of the jack is completely unloaded.
The preferable technical scheme is as follows:
the anchoring method of the detachable prestressed carbon fiber plate comprises the following specific steps:
s1, fixing the prestressed carbon plate on the reinforced member by adopting a wedge-shaped anchorage device, and tensioning to a specified tonnage by adopting a jack;
s2, segmenting the prestressed carbon plate;
s3, selecting a prestressed carbon fiber plate segment as an anchoring segment;
s4, fixing the selected prestressed carbon fiber plate segment through an anchoring piece, and applying a certain anchoring force to the segmented prestressed carbon fiber plate;
s5, unloading the tensioning tension force equivalent to the anchoring force by the jack;
s6, taking another anchoring part, and selecting the unfixed prestressed carbon fiber plate segment adjacent to the prestressed carbon fiber plate segment as a new anchoring segment;
and S7, repeating the steps S4-S6 until the tensioning tension of the jack is completely unloaded.
The anchoring method for the detachable prestressed carbon fiber plate further comprises the following steps after unloading is finished: the anchorage devices at the two ends and the jack are detached, and only the anchorage devices are reserved.
In the detachable prestressed carbon fiber plate anchoring method, in the step S2, the method for segmenting the reinforced member may refer to the following formula:
s＝P/(k*a)+1，0.4≤k≤0.7；
in the above formula, s is the number of segments of the prestressed carbon plate, P is the specified tonnage of the prestressed carbon plate, a is the anchoring force applied to the segmented prestressed carbon fiber plate by the anchoring member, and k is an empirical coefficient.
In the above method for anchoring a detachable prestressed carbon fiber plate, if the selected initial segment is a segment located at one end of the prestressed carbon fiber plate, the preset direction is as follows: the prestress carbon fiber plate selected each time is segmented into one segment from one end of the prestress carbon plate to the other end.
According to the anchoring method for the detachable prestressed carbon fiber plate, if the selected initial section is the section located at the middle of the prestressed carbon plate, the preset direction is as follows: the prestress carbon fiber plate selected each time is segmented into two sections from the middle to two ends of the prestress carbon plate.
The method for anchoring the detachable prestressed carbon fiber plate is characterized in that the anchoring piece is a steel fastener.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
according to the anchoring method for the detachable prestressed carbon fiber plate, the prestressed carbon fiber plate is segmented, and the segmentation method is determined by the total tension tonnage and the anchoring force of the steel fastener; the steel fasteners are used for anchoring, and are unloaded step by step during anchoring, so that the steel fasteners are ensured to be stressed uniformly, and only the steel fasteners and the carbon plates are reserved finally, and the influence on the appearance of the reinforced member is small; simultaneously, the tensioning anchor can be repeatedly used, and the cost is greatly reduced.
Drawings
Fig. 1 is a flowchart of a detachable prestressed carbon fiber plate anchoring method according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
Existing anchoring systems include flat panel, wedge, and wave anchors, among others. After tensioning is finished, the jack and the stop block are removed, but the anchorage device still needs to be left on the component and cannot be detached for reuse. In order to solve the problems, the invention provides a detachable prestressed carbon fiber plate anchoring method, which comprises the following steps:
segmenting the fixed prestressed carbon fiber plate;
applying a certain anchoring force to each prestressed carbon fiber plate section by section according to a preset direction, and unloading a tensioning tension force equivalent to the anchoring force by the jack; if the selected initial segment is a segment located at one end of the prestressed carbon plate, the preset direction is as follows: segmenting the prestress carbon fiber plate selected each time into one section from one end of the prestress carbon plate to the other end; if the selected initial section is the section positioned at the middle of the prestressed carbon plate, the preset direction is as follows: the prestress carbon fiber plate selected each time is segmented into two sections from the middle to two ends of the prestress carbon plate.
And repeating the operations until the tensioning tension of the jack is completely unloaded.
The prestressed carbon plate is segmented, and the segmentation method is jointly determined by the total tension tonnage and the anchoring force of a steel fastener; the steel fasteners are used for anchoring, and are unloaded step by step during anchoring, so that the steel fasteners are ensured to be stressed uniformly, and only the steel fasteners and the carbon plates are reserved finally, and the influence on the appearance of the reinforced member is small; simultaneously, the tensioning anchor can be repeatedly used, and the cost is greatly reduced.
The following is a description of specific examples.
Example 1
As shown in fig. 1, the present embodiment provides a detachable prestressed carbon fiber plate anchoring method, which includes the following specific steps:
s1, fixing the prestressed carbon plate on the reinforced member by adopting a wedge-shaped anchorage device, and tensioning to a specified tonnage by adopting a jack;
s2, segmenting the prestressed carbon plate;
s3, selecting a prestressed carbon fiber plate segment as an anchoring segment;
s4, fixing the selected prestressed carbon fiber plate segment through an anchoring piece, and applying a certain anchoring force to the segmented prestressed carbon fiber plate;
s5, unloading the tensioning tension force equivalent to the anchoring force by the jack;
s6, taking another anchoring part, and selecting the unfixed prestressed carbon fiber plate segment adjacent to the prestressed carbon fiber plate segment as a new anchoring segment;
and S7, repeating the steps S4-S6 until the tensioning tension of the jack is completely unloaded.
After the unloading is finished, the method further comprises the following steps: the anchorage devices at the two ends and the jack are detached, and only the anchorage devices are reserved.
In the step S2, the method for segmenting the prestressed carbon fiber plate can refer to the following formula:
s＝P/a+1；
in the above formula, s is the number of segments of the prestressed carbon plate, P is the specified tonnage of the prestressed carbon plate, and a is the anchoring force applied to the segmented prestressed carbon fiber plate by the anchoring member.
In order to enable the tensioning anchorage device to be reusable, the tensioning tension of the prestressed carbon plate on the reinforced member is converted into the tension provided by the anchoring piece, and the plurality of anchoring pieces are arranged, so that the uniform stress on each prestressed carbon fiber plate segment is ensured; in the anchoring mode, unloading step by step and anchoring step by step, the tensioning effect of the prestressed carbon fiber plate can be ensured to be consistent front and back compared with the mode of directly unloading the tensioning force of the jack, and loss can not occur.
In this embodiment, the method of segmenting the prestressed carbon fiber plate determines the anchoring effect of each segment of the prestressed carbon fiber plate. In the segmentation method of the embodiment, the number of segments of the prestressed carbon plate is determined by the total tensioning tonnage and the anchoring force of the anchoring piece, and on the premise of ensuring that the total tensioning tonnage is not lost before and after anchoring, the number of segments of the prestressed carbon fiber plate is adjusted instead of adjusting the actual anchoring capacity of the anchoring piece, so that a special anchoring piece is not needed, and the actual application requirement is met better.
To further illustrate the protocol in this example. A specific example process is also given below:
a detachable prestressed carbon fiber plate anchoring method comprises the following steps:
stretching the prestressed carbon plate to 32 tons according to a conventional mode;
dividing the reinforced member into 9 sections, wherein the common steel fastener is about 8 t;
fixing two ends of the most middle position of the carbon plate by using two steel fasteners, and applying pressure to the steel fasteners for fixing;
the jack unloads 8 tons, and then use two steel fasteners to fix the position of two sections of both sides of the middle section;
and unloading 8 tons again, repeating the operations until all the unloading is finished, and removing the anchors and the jacks at the two ends and only keeping the steel fasteners after the unloading is finished.
Example 2
Substantially the same as in example 1. Except that, in step S2, the method for segmenting the prestressed carbon fiber plate can refer to the following formula:
s＝P/(k*a)+1，0.4≤k≤0.7；
in the above formula, s is the number of segments of the prestressed carbon plate, P is the specified tonnage of the prestressed carbon plate, a is the anchoring force applied to the segmented prestressed carbon fiber plate by the anchoring member, and k is an empirical coefficient.
In the embodiment, k is set to be 0.4-0.7, preferably 0.5. The purpose of referring to the k value in this embodiment is to ensure a safety redundancy of the steel fastener by the k value. When the k value is too small, the segmentation of the prestressed carbon fiber plate is too much, so that the anchoring method in the embodiment is more complicated; and when k value was too big, then when any one steel fastener appeared connecting the problem or self structure appeared quality problems, can't go again to the steel fastener that goes wrong anchor power that applys adjust, and the k value is further injectd to this embodiment, can guarantee the dismantled prestressing force carbon fiber plate anchor method of this embodiment, and even the carbon plate after the anchor is under some abnormal conditions, also can go in the aspect to adjust, guarantees normal anchor effect.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A detachable prestressed carbon fiber plate anchoring method is characterized in that: the method comprises the following steps:
segmenting the fixed prestressed carbon fiber plate;
applying a certain anchoring force to each prestressed carbon fiber plate section by section according to a preset direction, and unloading a tensioning tension force equivalent to the anchoring force by the jack;
and repeating the operations until the tensioning tension of the jack is completely unloaded.
2. The method for anchoring a detachable prestressed carbon fiber plate according to claim 1, wherein: the method comprises the following specific steps:
s1, fixing the prestressed carbon plate on the reinforced member by adopting a wedge-shaped anchorage device, and tensioning to a specified tonnage by adopting a jack;
s2, segmenting the prestressed carbon plate;
s3, selecting a prestressed carbon fiber plate segment as an anchoring segment;
s4, fixing the selected prestressed carbon fiber plate segment through an anchoring piece, and applying a certain anchoring force to the segmented prestressed carbon fiber plate;
s5, unloading the tensioning tension force equivalent to the anchoring force by the jack;
s6, taking another anchoring part, and selecting the unfixed prestressed carbon fiber plate segment adjacent to the prestressed carbon fiber plate segment as a new anchoring segment;
and S7, repeating the steps S4-S6 until the tensioning tension of the jack is completely unloaded.
3. A detachable prestressed carbon fiber sheet anchoring method according to claim 1 or 2, characterized in that: after the unloading is finished, the method further comprises the following steps: the anchorage devices at the two ends and the jack are detached, and only the anchorage devices are reserved.
4. The method for anchoring a detachable prestressed carbon fiber plate according to claim 2, wherein: in the step S2, the method for segmenting the reinforced member may refer to the following formula:
s＝P/(k*a)+1，0.4≤k≤0.7；
in the above formula, s is the number of segments of the prestressed carbon plate, P is the specified tonnage of the prestressed carbon plate, a is the anchoring force applied to the segmented prestressed carbon fiber plate by the anchoring member, and k is an empirical coefficient.
5. The method for anchoring a detachable prestressed carbon fiber plate according to claim 2, wherein: if the selected initial segment is a segment located at one end of the prestressed carbon plate, the preset direction is as follows: the prestress carbon fiber plate selected each time is segmented into one segment from one end of the prestress carbon plate to the other end.
6. The method for anchoring a detachable prestressed carbon fiber plate according to claim 2, wherein: if the selected initial section is the section positioned at the middle of the prestressed carbon plate, the preset direction is as follows: the prestress carbon fiber plate selected each time is segmented into two sections from the middle to two ends of the prestress carbon plate.
7. The method for anchoring a detachable prestressed carbon fiber plate according to claim 2, wherein: the anchoring piece is a steel fastener.
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| CN202110959669.3A CN113622705B (en) | 2021-08-20 | 2021-08-20 | Anchoring method for detachable prestressed carbon fiber plate |
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| CN202110959669.3A CN113622705B (en) | 2021-08-20 | 2021-08-20 | Anchoring method for detachable prestressed carbon fiber plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493660A (en) * | 2011-12-30 | 2012-06-13 | 湖南大学 | Anchoring method and anchoring tool for carbon fiber reinforced composite material prestressed bar |
| CN106121265A (en) * | 2016-06-23 | 2016-11-16 | 山东大学 | Prestressing force, mechanical anchor external application carbon fiber sheet joint reinforcement device and method |
| CN106285038A (en) * | 2016-09-23 | 2017-01-04 | 长沙理工大学 | Separated prestressed carbon fiber cloth tensioning and pasting device and method |
| CN108843037A (en) * | 2018-06-07 | 2018-11-20 | 桂林理工大学 | A kind of prestressed fiber cloth reinforced girder tensioning anchor and its construction method |
| CN212025956U (en) * | 2020-03-24 | 2020-11-27 | 陕西通宇公路研究所有限公司 | Prestressing force anchor reinforced structure in grades |
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- 2021-08-20 CN CN202110959669.3A patent/CN113622705B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493660A (en) * | 2011-12-30 | 2012-06-13 | 湖南大学 | Anchoring method and anchoring tool for carbon fiber reinforced composite material prestressed bar |
| CN106121265A (en) * | 2016-06-23 | 2016-11-16 | 山东大学 | Prestressing force, mechanical anchor external application carbon fiber sheet joint reinforcement device and method |
| CN106285038A (en) * | 2016-09-23 | 2017-01-04 | 长沙理工大学 | Separated prestressed carbon fiber cloth tensioning and pasting device and method |
| CN108843037A (en) * | 2018-06-07 | 2018-11-20 | 桂林理工大学 | A kind of prestressed fiber cloth reinforced girder tensioning anchor and its construction method |
| CN212025956U (en) * | 2020-03-24 | 2020-11-27 | 陕西通宇公路研究所有限公司 | Prestressing force anchor reinforced structure in grades |
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