Prestressed carbon plate-ECC combined reinforced concrete structure and construction method

A technology of reinforced concrete and reinforced concrete beams, which is applied in the field of prestressed carbon plate-ECC combined reinforcement of reinforced concrete structures and construction, can solve the problems of insufficient use of reinforcement materials, unsuitable use of earthquake-resistant areas, and brittle failure of reinforced beams, etc., to achieve increased Anti-crack performance, improve structural safety, improve the effect of bearing capacity and ductility

Pending Publication Date: 2022-01-11
河南郑大建筑材料有限公司
0 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, there are the following defects: ①In the near-surface reinforcement method, the reinforcement plate is at the bottom of the beam, and the interface between the reinforcement end and the concrete is prone to peeling and splitting damage in harsh environments, which leads to the inability to make full use of reinforcement materials; ② In order to ...
View more

Method used

7) With jack symmetric stretching and tensioning clamping anchor rods, when the tension stress exceeds 115% of the tension control stress, clamp the anchor and be fixed on the bottom of the tension backing plate in the middle; it is necessary to pay attention The most important thing is to use the jacks to tension the bolt symmetrically, that is, all the jacks are tensioned at the same time to avoid tension eccentricity;
This prestressed carbon plate-ECC combination reinforces reinforced concrete structure and construction method, has laminated cement-based composite material ECC layer, prestressed material board and cement-based composite material ECC layer outer sheat...
View more

Abstract

The invention discloses a prestressed carbon plate-ECC combined reinforced concrete structure and a construction method. A cement-based composite material ECC layer, a prestressed plate and a cement-based composite material ECC layer outer protective layer are laminated at the bottom of a concrete beam; the plate is protected on the outer side of the plate reinforced by the prestressed plate by utilizing good durability such as crack resistance and impermeability of the cement-based composite material ECC, so that the erosion effect of the external severe environment on the plate is isolated, and meanwhile, the overall bearing capacity of the concrete beam and the crack resistance of the beam bottom can be improved; and the ECC layer is arranged between the prestressed plate and the concrete, so that the stripping of the plate can be delayed due to the characteristics of fine cracks, the interfacial shear stress is effectively transmitted, and the advantage of high tensile strength of the plate is better exerted.

Application Domain

Climate change adaptationBuilding repairs +1

Technology Topic

RebarInterfacial shear +9

Image

  • Prestressed carbon plate-ECC combined reinforced concrete structure and construction method
  • Prestressed carbon plate-ECC combined reinforced concrete structure and construction method
  • Prestressed carbon plate-ECC combined reinforced concrete structure and construction method

Examples

  • Experimental program(1)

Example Embodiment

[0040] The embodiments of the present invention will be described below by specific embodiments, and those skilled in this specification can easily understand other advantages and efficacy of the present invention.
[0041] The present invention provides a prestressed carbon plate -ecc combination reinforced steel concrete structure and construction method, such as Figure 1 to 4 Indicated.
[0042] Prestressed carbon plate-ECC combined reinforced concrete structure, including reinforced concrete beams 1, cement-based composite, and a prestressed plate material 4, and the prestressed plate material 4, and the cement-based composite ECC layer 2 The adhesive 3 is bonded to the prestressing plate 4; the outer side of the prestressing plate material 4 is also covered with a cement-based composite ECC layer 2; wherein the cement-based composite ECC layer 2 can also be referred to as an adhesive layer.
[0043] The thickness of the cement-based composite ECC layer is the same as the thickness of the cement-based composite ECC layer 2, and in the present embodiment, the thickness of 20 mm.
[0044] The fine bones of the cement-based composite ECC layer and cement-based composite ECC layer include one or more of fly ash, silica ash and mineral powder.
[0045] The prestressed plate material 4 can be reinforced by a prior art or rear sheet method.
[0046] When the primary method is used to reinforce the combination, the prestressed carbon plate-ECC combined the construction method of the reinforced concrete structure, including the following steps:
[0047]1) Cleaning the reinforcing reinforced concrete beam 1 for chisel cleaning, and moist after cleaning;
[0048] 2) Take a tension device and anchoring device that is fixed for the pre-stress sheet 4 sheets in both end beam edges of the reinforced concrete beam 1; in this example, the two ends of the reinforced concrete beam 400mm from the beam boundary Differential holes.
[0049] 3) Anchoring the pre-stress sheet on the prestressed sheet of tension, and the prestressed plate material is separated from the intermediate spacer in the middle of the reinforced concrete beam for subsequent addition of cement-based composites ECC layer; this embodiment In the middle, the thickness of the spacer layer is 20 mm, i.e., the lower cement-based composite ECC layer 2 of the cement-based composite ECC layer and the prestressed plate material is 20 mm.
[0050] 4) Perform a prestressed plate tension, allowing the prestressed plate to reach the tensile control stress;
[0051] 5) Removing the pads of the spacer in the interval layer of the cement-based composite ECC layer, as well as the pouring and maintenance of the lower part of the prestressed plate.
[0052] 6) After the cement-based composite ECC layer is hardening, the prestressed plate material is placed, i.e., the reinforcement of the reinforced concrete beam.
[0053] When the rear manifold is used to reinforce the combination, the prestressed carbon plate-ECC combined reinforced steel concrete structure construction method, including the following steps:
[0054] 1) Cleaning the reinforced concrete beam for chisel cleaning, and moist after cleaning;
[0055] 2) Directional anchoring apparatus and prestressed loading apparatus for prestabled sheet tensile in both end beam boundaries of reinforced concrete beams;
[0056] 3) Application of the prestressed plate to the isolation agent or wrap it with an isolation envelope, and then secured the prestressed plate to the bottom of the reinforced concrete beam to be reinforced by the block; in this example, the prestressed plate is intervals. Fixed 20 mm under the bottom of the reinforced concrete beam to be reinforced.
[0057] 4) Watering cement-based composite ECC layer on both sides of the prestressed plate, and the prestressed plate material is divided into a cement-based composite ECC layer into a cement-based composite ECC layer and a cement-based composite ECC layer two, this In an embodiment, the thickness of the cement-based composite ECC layer and the cement-based composite ECC layer is 20 mm.
[0058] 5) After the cement-based composite ECC layer reaches the intensity of the design requirements, the prestressed sheet material is pulled by the pre-stress load device, and the prestressed plate material is anchored after the prestressed load control stress, and the prestressed sheet will be The prestress is applied to the reinforcing laminated layer to achieve reinforcing reinforced reinforced concrete beams, and the cement-based composite ECC layer wrapped in the lower part of the prestressed plate can protect the prestressed plate, isolate the external harsh environment, greatly reduced Erosion of the prestressed sheet material.
[0059] In the specific construction, the prestressed carbon sheet-ECC combined with the construction method of reinforcing the reinforced concrete structure, the construction steps are detailed:
[0060] 1) According to the length of the reinforced concrete beam to be reinforced, the material characteristics of the prestressed plate material, the size of the tensile control stress, calculate the length, number of the prestressed plate material in this embodiment, and take it; at the same time, consider the prestressed plate material Thickness and thickness of the adhesive layer - cement-based composite ECC layer to be pouring; in this example, the pre-selected pre-plated material is a carbon fiberboard, and the specific material properties of its specific material are shown in Table 1;
[0061]
[0062] 2) Determine the size of the slot size and opening depth of the bottom of the reinforced concrete beam, considering the thickness of the carbon fiberboard and the thickness of the adhesive layer cement-based composite ECC layer, using the ECC cement-based and both the bond strength of both the outer beam It is also possible to improve the ability to bond strength with carbon fiber sheets, which greatly improves the reinforced durability;
[0063] 3) According to the tension anchor pad, the design position of the fixed end anchor pad is labeled out of the punched position on the side and bottom of the reinforced concrete beam to be reinforced, and the labeled punched position and the tensile end anchor pad, The hole of the expansion bolt on the fixed end anchor pad corresponds to the expansion tube after drilling, and in the hole in the holes; in the present embodiment, the anchor is selected from the curved surface of the curved surface of the carbon fiberboard;
[0064] 4) Before the resin gel is not solidified, screw the expansion bolt in the expansion tube, and secure the tensile anchor pad, the fixed end anchor pad is fixed to the design position;
[0065] 5) Secure the tension clamp to the tensile anchor pad with a tensile bolt bolt;
[0066] 6) After the tension of the tension, the carbon fiberboard to be tested is placed at 205 mm in the bottom of the reinforced concrete beam, and the carbon fiberboard is fixed by the tension of the beam bottom, and the carbon fiberboard is fixed. The two ends are anchored on the anchor of the tensile end and the fixed end, and prepare for tension;
[0067] 7) Use a jack symmetry of Zhanglai-pull jastener, when the tension stress exceeds 115% of the tensile control stress, clamp the anchor and secure the bottom of the middle of the tensile pad; it is necessary to pay attention, Use a jack symmetrical manipulator, that is, all jacks simultaneously, to avoid pulling eccentricity;
[0068] Subsequently, unloading tensile stress is then started, and when the tension stress is unloaded to the tensile control stress, the anchor is fixed to the bottom of the tensile end anchor pad by fixed bolts;
[0069] 8) Catering and maintenance of the cement-based composite ECC layer in the carbon fiber plate and the bottom of the carbon fiber sheet, the lower part of the cement-based composite ECC layer 2, before pouring, need to carry the beam bottom Chisard, clean, wet treatment;
[0070] 9) After the carbon fiber plate is bonded to the whole, the tension stress is completely unloaded, and the tensile pad and the tensile clutches are completely unloaded, and the reinforcing concrete beam can be completed; High-anti-cracking properties of ultra high tough cement-based composites and high impermeability properties to prevent chloride ions and harmful media in an external environment.
[0071] The prestressed carbon plate-ECC combined reinforced concrete structure and construction method, laminated the cement-based composite ECC layer, prestressed material plate, and cement-based composites ECC layer outer abandries in the bottom of the concrete beam; utilizing cement-based composites ECC cracking and infiltration, good durable performance, on the outside of the plate material reinforced by the prestressed sheet, isolates the erosion of the outer harsh environment on the sheet material, but also improve the overall bearing capacity of the concrete beam and the resistance of the beam bottom The ECC layer provided between the prestressed plate and the concrete can delay the peeling of the sheet, effectively transmitting the interface shear stress, thereby better exerting the high tensile strength of the plate material.
[0072] The basic principles, main features, and the advantages of the present invention are shown and described above. Those skilled in the industry will be appreciated that the present invention is not limited by the above embodiments, the above-described embodiments and description are merely illustrative of the invention, and the present invention will also have each in the preceding claims. Variations and improvements, these changes and improvements fall within the scope of the claimed invention. The invention requires the scope of protection by the appended claims and equivalents.
[0073] In the description of the invention, it is to be understood that the orientation or positional relationship of the term "front", "post", "left", "right", "center", and the like are based on the orientation or position shown in the drawing. The relationship is merely description of the present invention and simplified description, rather than indicating or implying means to the device or element must have a specific orientation, which is a specific directional configuration and operation, and thus is not to be construed as limiting the invention.

PUM

PropertyMeasurementUnit
Thickness20.0mm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Anti-skid noise-reduction pavement containing Novachip ultrathin wearing layer

PendingCN113463462Areduce road noiseImprove crack resistance
Owner:重庆海聚道路材料有限公司

Anti-cracking asphalt concrete and preparation method thereof

ActiveCN112645642AImprove crack resistancereduce cracking
Owner:宁波北仑鸿通工程建设有限公司

Classification and recommendation of technical efficacy words

  • Improve crack resistance

Process for welding 800MPa high-strength steel without preheating

ActiveCN1962151AStrong resistance to crack generation and propagationImprove crack resistance
Owner:BEIJING CHONGLEE MACHINERY ENG

Self-adjusting clutch release bearing

InactiveUS6843354B2improve crack resistancelow friction
Owner:SCHAEFFLER TECH AG & CO KG

Composite anti-cracking agent for super-long mass concrete and preparation method of composite anti-cracking agent

ActiveCN113213807AImprove crack resistanceImprove the effect of compensating shrinkage
Owner:SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products