CN103469737A

CN103469737A - Method for reinforcing concrete bending member by using variable-bonding prestress carbon fiber plate

Info

Publication number: CN103469737A
Application number: CN2013103272304A
Authority: CN
Inventors: 尚守平
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-31
Filing date: 2013-07-31
Publication date: 2013-12-25

Abstract

The invention discloses a method for reinforcing a concrete bending member by using a variable-bonding prestress carbon fiber plate. The method comprises the following steps of tensioning a carbon fiber plate for applying prestress; fixing the tensioned carbon fiber plate by using an anchorage device; and filling the gap between the carbon fiber plate and a reinforced structure with a structural reinforcing adhesive, i.e., sticking the carbon fiber plate and the structure together, wherein the structural reinforcing adhesive is aged and gradually turns to an unbonded state along with time, and the anchorage device and the carbon fiber plate are used for providing unbonded prestress. The method has the advantages that (1) the method is easy and convenient to operate; (2) the reinforced concrete member can be restrained uniformly by using the carbon fiber plate under assistance, and the tensioning crack gap of the concrete member is prevented from becoming too large in an unbonded way; (3) due to the adoption of variable-bonding reinforcing, the crake gap of the reinforced member is reduced, the width is reduced, and rust prevention and durability are facilitated; and (4) the method is convenient for constructing, is suitable for reinforcing members and can have the advantages of bonded and unbonded states.

Description

A kind of method of the knot pre-stressed carbon fiber plate reinforced concrete flexural member that becomes sticky

Technical field

The present invention relates to the civil engineering structure field of reinforcement, especially relate to a kind of method of the knot pre-stressed carbon fiber plate reinforced concrete flexural member that becomes sticky.

Background technology

China now approaches or surpasses its design life at a large amount of highway bridge of building in the early days of foundation, if complete removal is rebuild these old bridges and unsafe bridge will certainly bring great financial burden to national society.

Pre-stressed carbon fiber plate reinforcement bridge technology is emerging in recent years reinforcing technique, by carbon fiber sheet is applied to prestressing force, can give full play to and utilize its high-tensile; Reinforce and compare with non-prestressed sticking carbon fiber, can effectively improve the strength and stiffness that are reinforced member, and can avoid the phenomenon that occurs that carbon fiber is peeled off too early, but the reinforced structure discontinuity, carbon fiber board after stretch-draw and anchoring owing to without bonding is stressed, causing that fracture interval is excessive, crack is wider.

Summary of the invention

Technical problem solved by the invention is, overcome the above-mentioned defect that prior art exists, provide a kind of reinforced structure that can make stressed evenly, overcome carbon fiber board after stretch-draw and anchoring owing to without bonding is stressed, causing that fracture interval is excessive, the method for the knot pre-stressed carbon fiber plate reinforced concrete flexural member that becomes sticky of the wider shortcoming in crack.

The technical solution adopted for the present invention to solve the technical problems is, a kind of method of the knot pre-stressed carbon fiber plate reinforced concrete flexural member that becomes sticky, at first by carbon fiber board stretch-draw, then with ground tackle, the carbon fiber board after stretch-draw is fixed, fill with structural adhesive in gap between carbon fiber board and the structure that is reinforced, be about to carbon fiber board and structure and be pasted on one, As time goes on, structural adhesive is aging, progressively be transformed into without bond state, by ground tackle and carbon fiber board, provide prestressing without bondn.

Use the present invention, to use during ground tackle and carbon fiber board carry out flexural member external prestressing strengthening process, when just having reinforced, jointly apply prestressing force by ground tackle, carbon fiber board and structural adhesive, pass in time, structural adhesive is aging, loses adhesion stress, finally by ground tackle and carbon fiber board, provides prestressing without bondn.

Compared with prior art, the present invention has the following advantages:

(1) simple to operation;

(2) with the gap between structural adhesive filling carbon fiber plate and the structure that is reinforced, can assist carbon fiber board to retrain equably the concrete component be reinforced, avoid concrete component excessive as tension fracture interval without bonding;

(3) the knot prestressed reinforcement that becomes sticky, make the concrete in tension fracture interval little, and crack width is narrow, more is conducive to the antirust and durable of structure;

(4) construct conveniently, be applicable to the reinforcing of existing member, can possess has bonding and, without the advantage of bond state, the structural adhesive after solidifying As time goes on, can be aging gradually simultaneously, and the adhesion stress of structural adhesive weakens, to without bond state.

The accompanying drawing explanation

The structural representation that Fig. 1 is the present invention's one example;

The specific embodiment

Below in conjunction with example and accompanying drawing, the invention will be further described.

At first this example will apply prestressed carbon fiber board 2 stretch-draw, then with ground tackle 1, that the carbon fiber board 2 after stretch-draw is fixing, gap between carbon fiber board 2 and the structure 4 that is reinforced is filled closely knit with structural adhesive 3, be about to carbon fiber board 2 and the structure 4 that is reinforced is pasted on one.

Use the present invention, flexural member to be carried out to external prestressing strengthening while completing, by ground tackle 1, structural adhesive 3, carbon fiber board 2 is attached to and is reinforced on member, be similar to bonding stressed, using in early days, when load action, can make structure 4 ftracture as the bonded prestress structure, but fracture interval is less, also just make crack width less.Pass in time, structural adhesive is aging, loses adhesion stress, becomes the prestressing without bondn member, and at this moment, the vehicle-mounted power that applies can not produce new crack again, also can not make fracture interval become large.

With the gap between structural adhesive 3 filling carbon fiber plates 2 and the structure 4 that is reinforced, can assist carbon fiber board 2 to apply prestressing force to the structure 4 be reinforced equably, make fracture interval larger, avoid crack relatively concentrated; Structural adhesive 3 after solidifying As time goes on, can be aging gradually, and the adhesion stress of structural adhesive 3 weakens, and to completely losing, becomes without bond state.

Claims

1. the method for knot pre-stressed carbon fiber plate reinforced concrete flexural member that becomes sticky, it is characterized in that, at first will apply prestressed carbon fiber board stretch-draw, then with ground tackle, the carbon fiber board after stretch-draw is fixed, fill with structural adhesive in the gap between carbon fiber board and the structure that is reinforced, is about to carbon fiber board and structure and is pasted on one, As time goes on, structural adhesive is aging, progressively is transformed into without bond state, by ground tackle and carbon fiber board, provides prestressing without bondn.