CN-122029325-A - Materials and methods for reinforcement of buildings

Abstract

Improvement of building reinforcing construction method. The material (1) comprises an adhesive (2) and a reinforcing sheet (3) for reinforcing a building (4). A method (10) uses the material (1). The adhesive (2) is an epoxy-based two-component adhesive having a compressive elastic modulus of 500MPa or less in compliance with Japanese Industrial Standard A6024. The reinforcing sheet (3) comprises an engineering plastic and carbon fibers, and at least one surface of the reinforcing sheet (3) exhibits a water contact angle of 50 degrees or less.

Inventors

• WADA YOSHIAKI

Assignees

• 奥乐斯科技合同公司

Dates

Publication Date

20260512

Application Date

20241004

Priority Date

20231027

Claims (10)

1. 1. A material (1) comprising an adhesive (2) and a reinforcing sheet (3) for reinforcing a building (4), said material (1) being characterized in that, The adhesive (2) is an epoxy-based two-component adhesive having a compressive elastic modulus of 500MPa or less in accordance with Japanese Industrial Standard A6024, The reinforcing sheet (3) comprises an engineering plastic and carbon fibers, wherein the engineering plastic is composed of more than one selected from polyphenylene sulfide resin, polycarbonate and polyether-ether-ketone, and at least one surface of the reinforcing sheet (3) shows a water contact angle below 50 degrees.
2. 2. The material (1) according to claim 1, characterized in that, The adhesive (2) has a compressive strength (A method) of 70MPa or less as specified in Japanese Industrial Standard A6024.
3. 3. The material (1) according to claim 1, characterized in that, The adhesive (2) contains a polyamide-based curing agent.
4. 4. The material (1) according to claim 1, characterized in that, The reinforcing sheet (3) comprises polyphenylene sulfide resin and carbon fiber with a weight per unit area of 150g/m 2 or more, At least one surface of the reinforcing sheet (3) is hydrophilized by plasma treatment to exhibit a water contact angle of 50 degrees or less.
5. 5. The material (1) according to claim 1, characterized in that, The building (4) is a bridge.
6. 6. A method (10) for reinforcing a building, comprising a step of fixing a reinforcing sheet (3) to the surface of a building (4) via an adhesive (2), characterized in that the method (10) comprises the steps of, The adhesive (2) is an epoxy-based two-component adhesive having a compressive elastic modulus of 500MPa or less in accordance with Japanese Industrial Standard A6024, The reinforcing sheet (3) comprises an engineering plastic and carbon fibers, wherein the engineering plastic is composed of more than one selected from polyphenylene sulfide resin, polycarbonate and polyether-ether-ketone, and at least one surface of the reinforcing sheet (3) shows a water contact angle below 50 degrees.
7. 7. The method (10) of claim 6, wherein, The adhesive (2) has a compressive strength (A method) of 70MPa or less as specified in Japanese Industrial Standard A6024.
8. 8. The process (10) according to claim 6, wherein, The adhesive (2) contains a polyamide-based curing agent.
9. 9. The method (10) of claim 6, wherein, The reinforcing sheet (3) comprises polyphenylene sulfide resin and carbon fiber with a weight per unit area of 150g/m 2 or more, At least one surface of the reinforcing sheet (3) is hydrophilized by plasma treatment to exhibit a water contact angle of 50 degrees or less.
10. 10. The method (10) of claim 6, wherein, The building (4) is a bridge.

Description

Materials and methods for reinforcement of buildings Technical Field The invention relates to a building reinforcing method. More specifically, the present invention relates to a method for reinforcing a building such as a bridge using a specific building reinforcing material. The present invention also relates to a building reinforcing material used in the above reinforcing method. Background Aging with time, such as cracking or peeling of concrete surfaces in buildings such as bridges and roads, is unavoidable. Aged buildings must be serviced regularly. Conventionally, maintenance methods for protecting the surface of an aged building with a reinforcing material have been employed. In an example of the method for reinforcing a building described in patent document 1, the method includes a step of forming an elastic layer on a surface of the building, and an impregnation step of impregnating a fiber sheet, which is produced by aligning reinforcing fibers in one direction, with an epoxy adhesive on the elastic layer, and bonding the fiber sheet to the elastic layer by impregnating the fiber sheet with an epoxy resin. In the case of using the above-mentioned reinforcing method, careful rolling and maintenance are required for impregnating the fibrous sheet with the epoxy resin at the site of construction. The method for reinforcing a building described in patent document 2 requires a step of applying a curable polymer to a surface of the building, a step of curing the curable polymer to form a first layer, a step of heating an open surface of the first layer, and a step of bonding a second layer including reinforcing fibers and a thermoplastic base material to the surface of the heated first layer. In this reinforcement method, the surface of the cured layer 1 needs to be heated at the construction site, thereby requiring a lot of equipment and labor. The applicant has proposed a special reinforcing sheet in patent document 3, which can simplify the conventional repair method of a concrete building as described above. The sheet for reinforcing a building described in patent document 3 is formed of a prepreg containing an engineering plastic and carbon fibers, wherein the engineering plastic is formed of at least one selected from the group consisting of polyphenylene sulfide resin, polycarbonate and polyether ether ketone, and the sheet for reinforcing a building has at least one surface exhibiting a water contact angle of 50 degrees or less. In the case of reinforcing a building, the building reinforcing sheet is bonded to the surface of the building via a curable adhesive. Patent document 3 describes that the reinforcing effect of the above-mentioned sheet for reinforcing a building is evaluated by an adhesion test according to E545-2018 of Japan Society of civil engineering (Japan Society of CIVIL ENGINEERS, JSCE), a tensile test according to E541-2013 of JSCE, and a joint test according to E542-2018 of JSCE. The joint test is a test in which the end portions of two reinforcing sheets are bonded to each other to produce a superimposed portion (joint) of the sheets, and the difficulty in peeling the superimposed portion is measured as the adhesion strength. Patent document 3 describes that the reinforcing sheet material having end portions overlapped with each other (seams) exhibits high adhesive strength in the joint test. For example, in the reinforcement construction of a bridge, the reinforcement of a floor of several tens square meters to several hundreds square meters is sometimes performed. Since it is difficult to prepare and convey the reinforcing sheet in advance so as to cover the entire reinforcing surface, a plurality of reinforcing sheets for buildings having a predetermined area are generally prepared, and these reinforcing sheets are joined to the floor surface to be reinforced, thereby reinforcing the entire surface of the construction site. Fig. 7 shows a state in which the lower side of the floor (42) of the bridge (4) is reinforced with the reinforcing sheet (6). In fig. 7, the actual size shape is exaggerated/omitted. When the reinforcing sheet described in patent document 3 is used, the reinforcing sheet (6) is attached to the flattened base plate (42) via the adhesive (5). During cladding, two reinforcing sheets (6) are joined. Basically, at the joint portion (71), the layer of the reinforcing sheet (6) and the layer of the adhesive (5) are overlapped two by two on the base plate (42), and at the non-joint portion (72), the reinforcing sheet (6) and the adhesive are overlapped one by one on the base plate (42). As a result, two structural parts, namely a joint part (71) and a non-joint part (72), are formed on the reinforced bottom plate (42). The load P applied to the bridge is basically directed from the paving (41) side toward the reinforcing sheet (6) at the lower portion of the floor (42) (schematically indicated by an arrow, the arrow does not represent the direction of the act