阅读说明：本技术 一种预应力碳纤维板应力补充方法 (Stress supplementing method for prestressed carbon fiber plate ) 是由 韩松 谭成 马正兴 姜记冰 于 2021-04-22 设计创作，主要内容包括：本发明涉及一种预应力碳纤维板应力补充方法,将千斤顶置于混凝土构件与位于混凝土构件下方、用于加固该混凝土构件的预应力碳纤维板之间并进行顶升,待千斤顶顶升至一定顶升量时,将直径与千斤顶的顶升量相匹配的辊轴置于混凝土构件的预应力碳纤维板之间,再卸除千斤顶,再采用结构胶对混凝土构件与预应力碳纤维板间产生的间隙进行填补。本发明的一种预应力碳纤维板应力补充方法,通过仅增加辊轴一个部件,就能实现在避免新增碳纤维板的同时,有效补充构件损失的预应力,有效提升原碳纤维板的利用效率,降低混凝土构件加固的成本,实用性极强,可大范围推广。(The invention relates to a stress supplementing method of a prestressed carbon fiber plate, which comprises the steps of placing a jack between a concrete member and the prestressed carbon fiber plate which is positioned below the concrete member and used for reinforcing the concrete member, jacking, placing a roll shaft with the diameter matched with the jacking amount of the jack between the prestressed carbon fiber plates of the concrete member when the jack is jacked to a certain jacking amount, then removing the jack, and then filling a gap between the concrete member and the prestressed carbon fiber plate by using structural adhesive. According to the prestress carbon fiber plate stress supplementing method, only one part of the roll shaft is added, so that the prestress lost by a member can be effectively supplemented while a new carbon fiber plate is avoided, the utilization efficiency of the original carbon fiber plate is effectively improved, the cost of reinforcing the concrete member is reduced, the practicability is high, and the method can be popularized in a large range.)

1. A stress supplementing method for a prestressed carbon fiber plate is characterized in that a jack is arranged between a concrete member and the prestressed carbon fiber plate which is arranged below the concrete member and used for reinforcing the concrete member, the jack is jacked, when the jack is jacked to a certain jacking amount, a roll shaft with the diameter matched with the jacking amount of the jack is placed between the prestressed carbon fiber plates of the concrete member, and then the jack is removed.

2. The method for supplementing the stress of the prestressed carbon fiber plate as recited in claim 1, further comprising, after removing the jack: and filling a gap generated between the concrete member and the prestressed carbon fiber plate by using structural adhesive.

3. The method for supplementing the stress of the prestressed carbon fiber plate as recited in claim 1, wherein said matching is: the jacking amount of the jack is slightly larger than the diameter of the roll shaft.

4. The method for supplementing the stress of the prestressed carbon fiber plate as recited in claim 3, wherein the lifting amount of said jack is 2-3mm larger than the diameter of said roll shaft.

5. The method for supplementing the stress of the prestressed carbon fiber plate as claimed in claims 1 to 4, wherein the jacking amount h of the jack and the prestress f to be supplemented satisfy the following formula:

in the above formula, L is the length of the prestressed carbon fiber plate, and E is the elastic modulus of the prestressed carbon fiber plate.

6. The method for supplementing the stress of the prestressed carbon fiber plate as recited in claim 1, wherein a chamfering or chamfering device is provided at an end of the jack which is in contact with the prestressed carbon fiber plate.

Technical Field

The invention belongs to the technical field of concrete reinforcement, and particularly relates to a stress supplementing method for a prestressed carbon fiber plate.

Background

The carbon fiber plate is used as a common reinforcing material and has the characteristics of light weight, high strength and corrosion resistance. The carbon fiber plate is used in a mode of being directly adhered to the surface of a component and applying prestress through means such as an anchorage device. The prestressed carbon fiber plate is an active bending-resistant reinforcing means, and can effectively improve the bearing capacity of the member and control cracks and member deformation. However, in the long-term use, the phenomenon of prestress loss occurs due to the relaxation of carbon fibers, the creep of concrete, and the like, and the reinforcing effect is reduced. The conventional solution is to add an additional carbon fiber plate and perform pre-stress tensioning, which can supplement the pre-stress lost by the components, but the additional amount of work causes higher cost and reduces the use efficiency of the original carbon plate.

Disclosure of Invention

The invention aims to overcome the defects that in the long-term use process, due to carbon fiber relaxation, concrete creep and the like, prestress loss occurs, an additional carbon fiber plate is additionally arranged, the prestress tensioning cost is high, and the use efficiency of the original carbon plate is reduced in the prior art, and provides a prestress carbon fiber plate stress supplementing method.

In order to achieve the purpose, the technical scheme of the application is as follows:

a method for supplementing the stress of the prestressed carbon fibre plate includes such steps as putting a jack between the concrete member and the prestressed carbon fibre plate under the concrete member for reinforcing the concrete member, lifting, putting a roller with a diameter matched with the lifting amount of the jack between the prestressed carbon fibre plates, and removing the jack.

The preferable technical scheme is as follows:

the method for supplementing the stress of the prestressed carbon fiber plate further comprises the following steps of: and filling a gap generated between the concrete member and the prestressed carbon fiber plate by using structural adhesive.

The stress supplementing method for the prestressed carbon fiber plate is characterized in that: the jacking amount of the jack is slightly larger than the diameter of the roll shaft.

According to the stress supplementing method for the prestressed carbon fiber plate, the jacking amount of the jack is 2-3mm larger than the diameter of the roll shaft.

According to the stress supplementing method for the prestressed carbon fiber plate, the jacking amount h of the jack and the prestress f needing to be supplemented satisfy the following formula:

in the above formula, L is the length of the prestressed carbon fiber plate, and E is the elastic modulus of the prestressed carbon fiber plate.

In the method for supplementing the stress of the prestressed carbon fiber plate, a chamfer angle or chamfer angle device is arranged at one end of the jack which is in contact with the prestressed carbon fiber plate.

Compared with the prior art, the technical scheme claimed by the application has at least the following technical effects:

according to the prestress carbon fiber plate stress supplementing method, the prestress supplementing device is arranged between the concrete member and the prestress carbon fiber plate, and only one part of the roll shaft is added, so that the prestress lost by the member can be effectively supplemented while the carbon fiber plate is prevented from being newly added, the utilization efficiency of the original carbon fiber plate is effectively improved, the reinforcing cost of the concrete member is reduced, the practicability is high, and the method can be popularized in a large range.

Drawings

FIG. 1 is a schematic view of a construction principle of a stress supplementing method for a prestressed carbon fiber plate according to the present invention;

FIG. 2 is a second schematic view of the construction principle of a method for supplementing stress to a prestressed carbon fiber plate according to the present invention;

FIG. 3 is a third schematic view of the construction principle of a method for supplementing the stress of a prestressed carbon fiber plate according to the present invention;

FIG. 4 is a fourth schematic view of the construction principle of the method for supplementing the stress of the prestressed carbon fiber plate according to the present invention;

FIG. 5 is a schematic diagram of a chamfer structure of a jack of a method for supplementing stress to a prestressed carbon fiber plate according to the present invention;

100, concrete beams; 200. a prestressed carbon fiber sheet; 300. a jack; 310. chamfering; 400. and (4) a roll shaft.

Detailed Description

The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by those skilled in the art after reading the teachings of the present invention, and such equivalents also fall within the scope of the appended claims.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

For a concrete beam, the engineering structure of the concrete beam is aged along with the increase of the service time, and reinforcement measures are needed due to the change of the service function, the problem of engineering quality, the natural disasters and the like. The existing common bridge reinforcing methods comprise a section-enlarging reinforcing method, a steel plate-pasting reinforcing method, a carbon fiber cloth reinforcing method and the like, which all belong to passive reinforcement, and only after the bridge structure is damaged and generates stress deformation can the carbon fiber cloth and the steel plate be tensioned and play a role, so that the reinforcing effect is limited. The prestress carbon fiber plate is reinforced by adopting an active reinforcing method, and the carbon fiber plate is tensioned and generates prestress to reinforce the reinforced concrete bridge. Compared with the traditional carbon fiber cloth reinforcing method, the prestress carbon fiber plate bridge reinforcing method can give full play to the high strength effect of the carbon fibers, and has stronger corrosion resistance and durability and greatly enhanced tensile strength compared with the reinforcing method of enlarging the section or adhering a steel plate.

Referring to fig. 1, in the conventional prestressed carbon fiber plate reinforcing technology, a bonding agent is coated on a contact surface between a prestressed carbon fiber plate and a concrete beam bottom, and then the prestressed carbon fiber plate is tensioned, but in a long-term use process, a phenomenon of prestress loss occurs due to relaxation of carbon fibers, creep of concrete, and the like, so that a reinforcing effect is reduced. The conventional solution is to add an additional carbon fiber plate and perform pre-stress tensioning, which can supplement the pre-stress lost by the components, but the additional amount of work causes higher cost and reduces the use efficiency of the original carbon plate.

In order to solve the above problems, as shown in fig. 2 to 5, in the present embodiment, a method for supplementing stress to a prestressed carbon fiber plate 200 is provided, in which a jack 300 is placed between a concrete member 100 and the prestressed carbon fiber plate 200, which is located below the concrete member 100 and is used for reinforcing the concrete member 100, and is lifted, when the jack 300 is lifted to a certain lifting amount, a roller shaft 400 having a diameter matching with the lifting amount of the jack 300 is placed between the prestressed carbon fiber plates 200 of the concrete member 100, and then the jack 300 is removed.

By adopting the method, only one part of the roll shaft 400 is added, so that the loss prestress of the component can be effectively supplemented while the new carbon fiber plate is avoided, the utilization efficiency of the original carbon fiber plate is effectively improved, the reinforcing cost of the concrete component 100 is reduced, the practicability is strong, and the method can be popularized in a large range.

The jack 300 is used in this embodiment to lift a position capable of accommodating the roll shaft 400 between the concrete member 100 and the prestressed carbon fiber plate 200 by using the jack 300, the jack 300 in this embodiment is used as a lifting tool, and other similar objects, devices or components capable of performing a lifting function can be applied to this embodiment.

Similarly, regarding the roller 400, the roller 400 in the present embodiment is mainly used to reinforce the concrete member 100 instead of the prestressed carbon fiber plate 200, the arrangement of the roller 400 is not limited to the roller, and other similar materials such as chamfered steel plates, steel blocks, etc. are also applicable to the roller in the present embodiment.

More specifically, since the jack 300 and the roll shaft 400 are disassembled between the concrete member 100 and the prestressed carbon fiber plate 200, a gap is inevitably generated between the concrete member 100 and the prestressed carbon fiber plate 200. To solve this problem, in a preferred embodiment, as shown in fig. 5, after the jack 300 is removed, it should further include: the gap between the concrete member 100 and the prestressed carbon fiber plate 200 is filled with structural adhesive. The structural adhesive can be an epoxy resin structural adhesive.

Further, in the above method, the matching of the diameter of the roller shaft 400 and the lifting amount of the jack 300 means: the lifting amount of the jack 300 is slightly larger than the diameter of the roll shaft 400. More specifically, the lifting amount of the jack 300 is 2-3mm larger than the diameter of the roll shaft 400. The purpose of this design is to allow the roller shaft to be more easily placed between the concrete member and the carbon plate.

For the roll shaft 400, the diameter of the roll shaft 400 is determined by the magnitude of the prestress to be supplemented, and the jacking amount h of the jack and the prestress f to be supplemented satisfy the following formula:

in the above formula, L is the length of the prestressed carbon fiber plate, and E is the elastic modulus of the prestressed carbon fiber plate.

By establishing a relation equation formula between the jacking amount h of the jack and the prestress f to be supplemented, the jacking amount h of the jack can be calculated on site according to the prestress f to be supplemented, so that the jacking amount of the jack can be adjusted rapidly, and a proper roller shaft 400 is selected to replace the prestress carbon fiber plate 200 to reinforce the concrete member 100.

In another preferred embodiment, since the jack 300 may easily damage the prestressed carbon fiber plate 200 when contacting the prestressed carbon fiber plate 200, which may result in a reduction in the service life of the prestressed carbon fiber plate 200, as shown in fig. 5, in this embodiment, a chamfer 310 or a chamfer device is disposed at one end of the jack 300 contacting the prestressed carbon fiber plate 200, which may further prevent the prestressed carbon fiber plate 200 from being damaged.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts based on the technical solutions of the present invention.