CN113914652A - Prestressed carbon plate-ECC combined reinforced concrete structure and construction method - Google Patents
Prestressed carbon plate-ECC combined reinforced concrete structure and construction method Download PDFInfo
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- CN113914652A CN113914652A CN202111311064.XA CN202111311064A CN113914652A CN 113914652 A CN113914652 A CN 113914652A CN 202111311064 A CN202111311064 A CN 202111311064A CN 113914652 A CN113914652 A CN 113914652A
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- E—FIXED CONSTRUCTIONS
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- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
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- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
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Abstract
The invention discloses a prestressed carbon plate-ECC combined reinforced concrete structure and a construction method, wherein a cement-based composite material ECC layer, a prestressed material plate and a cement-based composite material ECC layer outer protective layer are superposed at the bottom of a concrete beam; the cement-based composite material has good durability such as ECC crack resistance and impermeability, protects the plate outside the prestressed plate reinforced plate, isolates the corrosion action of the external severe environment on the plate, and can improve the integral bearing capacity of the concrete beam and the crack resistance of the beam bottom; through the ECC layer arranged between the prestressed plate and the concrete, the characteristic of fine cracks can delay the peeling of the plate, and the interface shear stress is effectively transferred, so that the advantage of high tensile strength of the plate is better exerted.
Description
Technical Field
The invention belongs to the technical field of building structures, and particularly relates to a prestressed carbon plate-ECC combined reinforced concrete structure and a construction method.
Background
In a building structure, a reinforced concrete beam is used as a main stressed member and plays an important role in transferring load. For some buildings with changed use functions and increased loads or earthquake-damaged structures after earthquakes, beam bodies in the structures need to be reinforced. On the other hand, most concrete beams are in a crack working state, and under the atmospheric environment, especially under the corrosive environment condition, steel bars in the beam body can be corroded along with the time, and the concrete can be rusted and cracked, so that the bearing capacity is reduced, the concrete cannot continue to work normally, and the concrete also needs to be reinforced.
The reinforced concrete beam is reinforced by common methods such as a steel plate pasting method, an external reinforcing method and a near-surface reinforcing method. The steel plate pasting method is a reinforcing method for pasting steel plates on the side faces and/or the bottom of a beam, the joint working performance of the body beam and the steel plates is poor, the steel plates are exposed in the air and are easy to corrode, the reinforcing service life is influenced, and the appearance of the beam is changed, so that the attractiveness is influenced. An external reinforcement method, abbreviated as EB (EB) method, is to reinforce a reinforced concrete beam by using an FRP (fiber reinforce Plastic) strip, in the method, a reinforcement material is easy to peel off from a body beam to cause that the reinforcement material cannot be fully utilized, and the FRP material is exposed outside and is easy to suffer from external adverse effects such as abrasion, impact, fire, high temperature, high humidity, weather, freeze thawing and the like, so that the reinforcement effect is lost due to fracture, and further, the beam body is suddenly damaged due to sudden unloading, thus threatening the life and property safety of people; moreover, the surface of the reinforced concrete member needs to be treated, the time and the labor are consumed, the workload is large, the shape of the body beam is changed, and the attractiveness is affected.
The near-surface reinforcing method is called NSM method for short, and means that a groove is formed in a protective layer at the bottom of a beam to be reinforced, structural glue of a filling material is injected into the groove, and a reinforcing plate is attached. But has the following disadvantages: firstly, in a near-surface reinforcing method, a reinforcing plate is positioned at the bottom of a beam, and the interface between a reinforcing end and concrete is easy to peel off under severe environment to cause fracture damage, so that the reinforcing material cannot be fully utilized; secondly, the reinforcing method generally adopts the fiber reinforced composite material in order to realize corrosion resistance, but the fiber reinforced composite material is a brittle material, so that the reinforcing beam can be finally subjected to brittle failure, and the reinforcing method is not suitable for earthquake-resistant areas; and the filling material is made of structural adhesive, so that the manufacturing cost is high on one hand, and the durability is relatively poor on the other hand.
Therefore, finding a novel reinforced structure which not only meets the requirement of earthquake resistance but also does not change the beautiful structure is a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a prestressed carbon plate-ECC combined reinforced concrete structure and a construction method thereof, which overcome the defects of large crack and wide deflection at the bottom of a concrete beam.
In order to solve the technical problems, the invention adopts the technical scheme that:
prestressed carbon plate-ECC combination reinforcement reinforced concrete structure, its characterized in that: the concrete beam comprises a reinforced concrete beam, a first cement-based composite material ECC layer and a prestressed plate which are arranged from top to bottom in an adjacent mode, wherein the first cement-based composite material ECC layer is bonded with the prestressed plate through a bonding agent;
and a second cement-based composite material ECC layer is coated on the outer side of the prestressed plate.
The prestressed plate is reinforced and combined by adopting a pretensioning method.
The prestressed plate is reinforced and combined by adopting a post-tensioning method.
The thickness of the first cement-based composite material ECC layer is the same as that of the second cement-based composite material ECC layer.
The thickness of the first cement-based composite material ECC layer and the thickness of the second cement-based composite material ECC layer are both 20 mm.
The fine aggregate in the first cement-based composite material ECC layer and the second cement-based composite material ECC layer comprises one or more of fly ash, silica fume and mineral powder.
When the prestressed plate is reinforced and combined by adopting a pretensioning method, the construction method for reinforcing the reinforced concrete structure by the prestressed carbon plate-ECC combination comprises the following steps:
1) performing chiseling cleaning on the bottom of the reinforced concrete beam to be reinforced, and wetting the bottom after cleaning;
2) drilling holes in the inner sides of the beam boundaries at two ends of the reinforced concrete beam, and installing and fixing tensioning equipment and an anchoring device for tensioning the prestressed plates;
optimally, chiseling holes at the positions, 400mm away from the beam boundary, of two ends of the reinforced concrete beam;
3) anchoring a prestressed plate on prestressed loading tensioning equipment, and separating a spacing layer between the prestressed plate and the reinforced concrete beam by using a cushion block for subsequently additionally paving a cement-based composite material ECC layer I;
4) tensioning the prestressed plate to control the tension of the prestressed plate;
5) taking out the cushion block to pour and maintain the first cement-based composite material ECC layer on the spacing layer, and pouring and maintaining the second cement-based composite material ECC layer on the lower part of the prestressed plate;
6) and (4) after the cement-based composite material ECC layer is hardened to reach the design strength, releasing the prestressed plate, and finishing the reinforcement of the reinforced concrete beam.
When the prestressed plate is reinforced and combined by adopting a post-tensioning method, the construction method for reinforcing the reinforced concrete structure by the prestressed carbon plate-ECC combination comprises the following steps:
1) performing chiseling cleaning on the bottom of the reinforced concrete beam to be reinforced, and wetting the bottom after cleaning;
2) drilling holes in the inner sides of the beam boundaries at two ends of the reinforced concrete beam, and installing and fixing an anchoring device and prestress loading equipment for tensioning a prestress plate;
3) coating an isolating agent on the prestressed plate or wrapping the prestressed plate by an isolating coating film, and then temporarily fixing the prestressed plate below the bottom of the reinforced concrete beam to be reinforced at intervals by using a cushion block;
preferably, the prestressed plates are temporarily fixed at intervals at the position 20mm below the bottom of the reinforced concrete beam to be reinforced;
4) pouring cement-based composite material ECC layers on two sides of the prestressed plate, and dividing the cement-based composite material ECC layer into a first cement-based composite material ECC layer and a second cement-based composite material ECC layer in the middle of the prestressed plate;
5) and after the ECC layer of the cement-based composite material to be poured reaches the strength required by the design, tensioning the prestressed plate by using prestress loading equipment, and anchoring the prestressed plate after tensioning to tension control stress.
The invention has the beneficial effects that:
(1) the prestressed carbon plate-ECC combined reinforced concrete structure and the construction method thereof are characterized in that a cement-based composite material ECC layer, a prestressed material plate and a cement-based composite material ECC outer protective layer are superposed at the bottom of a concrete beam; the cement-based composite material has good durability such as ECC crack resistance and impermeability, protects the plate outside the prestressed plate reinforced plate, isolates the corrosion action of the external severe environment on the plate, and can improve the integral bearing capacity of the concrete beam and the crack resistance of the beam bottom; through the ECC layer arranged between the prestressed plate and the concrete, the characteristic of fine cracks can delay the peeling of the plate, and the interface shear stress is effectively transferred, so that the advantage of high tensile strength of the plate is better exerted.
(2) The invention can improve the defect of weak bonding force between the prestressed material plate-carbon fiber plate and the existing concrete beam in the ordered reinforcement of the concrete beam, improve the large bonding strength between the prestressed material plate-carbon fiber plate and the existing beam bottom through the ECC cement base, and simultaneously improve the bonding strength between the prestressed material plate and the carbon fiber plate, thereby greatly improving the durability of the reinforcement.
(3) The cement-based composite material ECC is a composite material with the characteristics of high toughness, high ductility and multi-joint cracking, is about 25-35% lighter than common concrete, is an effective measure for controlling structural cracking, has extremely important significance in the aspects of improving the structural safety and durability, has great practical significance for ocean engineering and port engineering, can be directly integrated with the existing concrete beam to a great extent, increases the cracking resistance of the beam, improves the bearing capacity and ductility of the combined beam, and can also fully improve the durability of the combined beam.
(4) According to the invention, the cement-based composite material ECC with a certain layer thickness is paved below the reinforcing layer of the prestressed plate at the bottom of the beam, so that the mechanical property of the ECC can be effectively exerted, the bottom of the beam is not easy to crack, and meanwhile, the effect of protecting the prestressed plate can be well played, and the penetration or corrosion damage of an erosion medium in the environment can be isolated.
(5) The construction method for reinforcing the reinforced concrete structure by the prestressed carbon plate-ECC combination provided by the invention reduces the cost of subsequent maintenance and repair and solves the problems of reinforcement and repair of the concrete structure in view of the whole life cycle.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the present invention using a pretensioned method to reinforce a reinforced concrete beam;
FIG. 3 is a schematic view of the bottom surface of the prestressed plate bonding anchor;
fig. 4 is a bottom view of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The invention provides a prestressed carbon plate-ECC combined reinforced concrete structure and a construction method thereof, as shown in figures 1 to 4.
The prestressed carbon plate-ECC combined reinforced concrete structure comprises a reinforced concrete beam 1, a cement-based composite material ECC layer I2 and a prestressed plate 4 which are arranged from top to bottom in a close proximity mode, wherein the cement-based composite material ECC layer I2 is bonded with the prestressed plate 4 through a bonding agent 3; the outer side of the prestressed plate 4 is further coated with a cement-based composite material ECC layer II 5; the cement-based composite ECC layer one 2 may also be referred to as a bonding layer.
The thickness of the first cement-based composite material ECC layer is the same as that of the second cement-based composite material ECC layer, and in the embodiment, the thicknesses of the first cement-based composite material ECC layer and the second cement-based composite material ECC layer are both 20 mm.
The fine aggregate in the first cement-based composite material ECC layer and the second cement-based composite material ECC layer comprises one or more of fly ash, silica fume and mineral powder.
The prestressed plate 4 can be reinforced and combined by adopting a pre-tensioning method or a post-tensioning method.
When a pretensioning method is adopted for reinforcement combination, the construction method for reinforcing the reinforced concrete structure by the prestressed carbon plate-ECC combination comprises the following steps:
1) the bottom of the reinforced concrete beam 1 to be reinforced is chiseled and cleaned, and is wet after being cleaned;
2) drilling holes in the inner sides of the beam boundaries at the two ends of the reinforced concrete beam 1, and installing and fixing tensioning equipment and an anchoring device for tensioning the prestressed plates 4; in this embodiment, the holes are bored at both ends of the reinforced concrete beam 400mm from the beam boundary.
3) Anchoring a prestressed plate on prestressed loading tensioning equipment, and separating a spacing layer between the prestressed plate and the reinforced concrete beam by using a cushion block for subsequently additionally paving a cement-based composite material ECC layer I; in this embodiment, the thickness of the distance layer is 20mm, that is, the casting thicknesses of the first cement-based composite material ECC layer and the second cement-based composite material ECC layer under the prestressed plate are both 20 mm.
4) Tensioning the prestressed plate to control the tension of the prestressed plate;
5) taking out the cushion block to pour and maintain the first cement-based composite material ECC layer on the spacing layer, and pouring and maintaining the second cement-based composite material ECC layer on the lower part of the prestressed plate;
6) and (4) after the cement-based composite material ECC layer is hardened to reach the design strength, releasing the prestressed plate, and finishing the reinforcement of the reinforced concrete beam.
When the post-tensioning method is adopted for reinforcement combination, the construction method for reinforcing the reinforced concrete structure by the prestressed carbon plate-ECC combination comprises the following steps:
1) performing chiseling cleaning on the bottom of the reinforced concrete beam to be reinforced, and wetting the bottom after cleaning;
2) drilling holes in the inner sides of the beam boundaries at two ends of the reinforced concrete beam, and installing and fixing an anchoring device and prestress loading equipment for tensioning a prestress plate;
3) coating an isolating agent on the prestressed plate or wrapping the prestressed plate by an isolating coating film, and then temporarily fixing the prestressed plate below the bottom of the reinforced concrete beam to be reinforced at intervals by using a cushion block; in this embodiment, the prestressed plate is temporarily fixed at intervals at 20mm below the bottom of the reinforced concrete beam to be reinforced.
4) The cement-based composite material ECC layer is poured on two sides of the prestressed plate, the prestressed plate divides the cement-based composite material ECC layer into a first cement-based composite material ECC layer and a second cement-based composite material ECC layer in the middle, and in the embodiment, the thicknesses of the first cement-based composite material ECC layer and the second cement-based composite material ECC layer are both 20 mm.
5) After the cast cement-based composite material ECC layer reaches the strength required by the design, tensioning the prestressed plate by using prestressed loading equipment, anchoring the prestressed plate after tensioning to a tensioning control stress, and applying the prestress to the reinforcing laminated layer by using the prestressed plate to achieve the effect of reinforcing the reinforced concrete beam; meanwhile, the cement-based composite material ECC layer II wrapped on the lower portion of the prestressed plate can protect the prestressed plate, isolate the external severe environment and greatly reduce the erosion effect on the prestressed plate.
The construction method for reinforcing the reinforced concrete structure by the combination of the prestressed carbon plate and the ECC comprises the following construction steps in detail:
1) calculating the length of the prestressed plate in the embodiment according to the length of the reinforced concrete beam to be reinforced, the material characteristics of the prestressed plate and the magnitude of the tension control stress, marking and intercepting; meanwhile, the thickness of the prestressed plate and the thickness of the bonding layer-cement-based composite material ECC layer to be poured are considered; in the embodiment, the selected prestressed plate is a carbon fiber plate, and the specific material properties of the prestressed plate are shown in table 1;
2) determining the size and the depth of a groove in the bottom of the reinforced concrete beam, considering the thickness of the carbon fiber plate and the thickness of an ECC (error correction code) layer of a bonding layer cement-based composite material, and utilizing the large bonding strength between an ECC cement base and the existing beam bottom, the capability of improving the bonding strength with the carbon fiber plate can be improved, so that the durability of reinforcement is greatly improved;
3) marking punching positions on the side surface and the bottom of the reinforced concrete beam to be reinforced according to the design positions of the tensioning end anchor backing plate and the fixed end anchor backing plate, wherein the marked punching positions correspond to holes of expansion bolts on the tensioning end anchor backing plate and the fixed end anchor backing plate, inserting an expansion pipe after drilling, and filling resin glue into the holes; in the embodiment, the anchorage device is a carbon fiber plate inner curved surface clamping type anchorage device;
4) before the resin adhesive is not solidified, an expansion bolt is screwed in the expansion pipe, and the tensioning end anchor backing plate and the fixed end anchor backing plate are fixed at the designed positions;
5) fixing a tensioning clamp on a tensioning end anchor backing plate by using a tensioning backing plate bolt;
6) after the stretching clamp and the anchorage device are fixed, laying a carbon fiber plate to be stretched at a position 205mm away from a groove in the bottom of the reinforced concrete beam, fixing the carbon fiber plate through stretching clamps at two ends of the beam bottom, anchoring two ends of the carbon fiber plate on the anchorage devices at the stretching end and the fixed end, and preparing for stretching;
7) symmetrically tensioning the anchor rod of the tensioning clamp by using a jack, and clamping the anchor and fixing the anchor at the bottom of the middle tensioning cushion plate after the tensioning stress exceeds 115% of the tensioning control stress; it should be noted that the anchor rod is symmetrically tensioned by jacks, that is, all the jacks are simultaneously tensioned to avoid tension eccentricity;
then, unloading the tensile stress, and fixing the anchorage device at the bottom of the anchor backing plate at the tensioning end through a fixing bolt when the tensile stress is unloaded to the tensile control stress;
8) pouring and maintaining a first cement-based composite material ECC layer on the carbon fiber plate and the inner part of the beam bottom, and pouring and maintaining a second cement-based composite material ECC layer on the lower part of the carbon fiber plate; before pouring, chiseling, cleaning and wetting treatment are carried out on the beam bottom;
9) after the carbon fiber plate and the cement-based composite material ECC layer are bonded into a unified whole, completely unloading the tensile stress, and unloading the tensile base plate and the tensile clamp to complete the reinforcement of the reinforced concrete beam; the plate is reinforced by preventing the corrosion of chloride ions and harmful media in the external environment by utilizing the high crack resistance and the high anti-permeability of the ECC layer of the cement-based composite material with ultrahigh toughness at the outer side.
The prestressed carbon plate-ECC combined reinforced concrete structure and the construction method thereof are characterized in that a cement-based composite material ECC layer, a prestressed material plate and a cement-based composite material ECC outer protective layer are superposed at the bottom of a concrete beam; the cement-based composite material has good durability such as ECC crack resistance and impermeability, protects the plate outside the prestressed plate reinforced plate, isolates the corrosion action of the external severe environment on the plate, and can improve the integral bearing capacity of the concrete beam and the crack resistance of the beam bottom; through the ECC layer arranged between the prestressed plate and the concrete, the characteristic of fine cracks can delay the peeling of the plate, and the interface shear stress is effectively transferred, so that the advantage of high tensile strength of the plate is better exerted.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "center", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the scope of the present invention.
Claims (10)
1. Prestressed carbon plate-ECC combination reinforcement reinforced concrete structure, its characterized in that: the concrete beam comprises a reinforced concrete beam, a first cement-based composite material ECC layer and a prestressed plate which are arranged from top to bottom in an adjacent mode, wherein the first cement-based composite material ECC layer is bonded with the prestressed plate through a bonding agent;
and a second cement-based composite material ECC layer is coated on the outer side of the prestressed plate.
2. The prestressed carbon slab-ECC combination reinforced concrete structure of claim 1, wherein: the prestressed plate is reinforced and combined by adopting a pretensioning method.
3. The prestressed carbon slab-ECC combination reinforced concrete structure of claim 1, wherein: the prestressed plate is reinforced and combined by adopting a post-tensioning method.
4. The prestressed carbon slab-ECC combination reinforced concrete structure of claim 1, wherein: the thickness of the first cement-based composite material ECC layer is the same as that of the second cement-based composite material ECC layer.
5. The prestressed carbon slab-ECC combination reinforced concrete structure of claim 4, wherein: the thickness of the first cement-based composite material ECC layer and the thickness of the second cement-based composite material ECC layer are both 20 mm.
6. The prestressed carbon slab-ECC combination reinforced concrete structure of claim 1, wherein: the fine aggregate in the first cement-based composite material ECC layer and the second cement-based composite material ECC layer comprises one or more of fly ash, silica fume and mineral powder.
7. The construction method for reinforcing a reinforced concrete structure by the combination of the prestressed carbon plate and the ECC according to claim 2, which comprises the following steps:
1) performing chiseling cleaning on the bottom of the reinforced concrete beam to be reinforced, and wetting the bottom after cleaning;
2) drilling holes in the inner sides of the beam boundaries at two ends of the reinforced concrete beam, and installing and fixing tensioning equipment and an anchoring device for tensioning the prestressed plates;
3) anchoring a prestressed plate on prestressed loading tensioning equipment, and separating a spacing layer between the prestressed plate and the reinforced concrete beam by using a cushion block for subsequently additionally paving a cement-based composite material ECC layer I;
4) tensioning the prestressed plate to control the tension of the prestressed plate;
5) taking out the cushion block to pour and maintain the first cement-based composite material ECC layer on the spacing layer, and pouring and maintaining the second cement-based composite material ECC layer on the lower part of the prestressed plate;
6) and (4) after the cement-based composite material ECC layer is hardened to reach the design strength, releasing the prestressed plate, and finishing the reinforcement of the reinforced concrete beam.
8. The construction method for reinforcing a reinforced concrete structure by the combination of the prestressed carbon plate and the ECC according to claim 7, wherein: and 2) performing hole drilling at the positions, 400mm away from the boundary of the beam, of the two ends of the reinforced concrete beam.
9. The construction method for reinforcing a reinforced concrete structure by the combination of the prestressed carbon plate and the ECC according to claim 3, is characterized by comprising the following steps:
1) performing chiseling cleaning on the bottom of the reinforced concrete beam to be reinforced, and wetting the bottom after cleaning;
2) drilling holes in the inner sides of the beam boundaries at two ends of the reinforced concrete beam, and installing and fixing an anchoring device and prestress loading equipment for tensioning a prestress plate;
3) coating an isolating agent on the prestressed plate or wrapping the prestressed plate by an isolating coating film, and then temporarily fixing the prestressed plate below the bottom of the reinforced concrete beam to be reinforced at intervals by using a cushion block;
4) pouring cement-based composite material ECC layers on two sides of the prestressed plate, and dividing the cement-based composite material ECC layer into a first cement-based composite material ECC layer and a second cement-based composite material ECC layer in the middle of the prestressed plate;
5) and after the ECC layer of the cement-based composite material to be poured reaches the strength required by the design, tensioning the prestressed plate by using prestress loading equipment, and anchoring the prestressed plate after tensioning to tension control stress.
10. The construction method for reinforcing a reinforced concrete structure by the combination of the prestressed carbon plate and the ECC according to claim 9, wherein: and 3) temporarily fixing the prestressed plates at intervals at the position 20mm below the bottom of the reinforced concrete beam to be reinforced.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481868A (en) * | 2022-02-24 | 2022-05-13 | 广州大学 | Beam member prestress bending-resistant reinforcing structure and method |
| CN116163470A (en) * | 2023-02-22 | 2023-05-26 | 上海应用技术大学 | FRP reinforced UHPC board shear-resistant reinforced concrete beam and installation method thereof |
-
2021
- 2021-11-08 CN CN202111311064.XA patent/CN113914652A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481868A (en) * | 2022-02-24 | 2022-05-13 | 广州大学 | Beam member prestress bending-resistant reinforcing structure and method |
| CN116163470A (en) * | 2023-02-22 | 2023-05-26 | 上海应用技术大学 | FRP reinforced UHPC board shear-resistant reinforced concrete beam and installation method thereof |
| CN116163470B (en) * | 2023-02-22 | 2024-05-17 | 上海应用技术大学 | FRP reinforced UHPC board shear-resistant reinforced concrete beam and installation method thereof |
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