Cementitious material repair component and repair method

Abstract

The present invention provides a cement-based material repair component, which includes a hot melt strip, a heating wire, and an expansion bladder. The heating wire and the expansion bladder are both arranged inside the hot melt strip. The wiring end of the heating wire passes out from the outer end of the hot melt strip. The expansion bladder is filled with a temperature-controlled expansion material. A terminal component is installed at the outer end of the hot melt strip. The outer surface of the terminal component is provided with threads. The terminal component is embedded in the outer surface of the cement-based material structure and is tightly combined with it through the threads. The wiring end of the heating wire passes out from the terminal component. A pressure sensor is installed inside the hot melt strip or the terminal component. This cement-based material repair component has a simple structure, reasonable design, a small operation space, and is convenient to use, and can repair the cement-based material structure body.

Description

Technical Field

[0001] The present invention relates to the field of concrete structure repair, and particularly to a cement-based material repair component and a repair method. Background Art

[0002] Under the long-term action of external loads such as seismic loads and fatigue loads, the cracking and damage of concrete structures are inevitable phenomena. This will not only damage the integrity of the concrete structure, but also change the stress conditions, resulting in the structure losing its designed function and causing major safety hazards. Conventional repair methods include pressure grouting method, grooving filling method and film sealing method. These works require an intuitive working surface and a large working space to ensure the repair quality.

[0003] For underground projects such as concrete pile foundations, tunnels, and dam foundations, different from the structural damage of buildings on the ground, it is impossible to directly observe the damaged parts and there is no suitable working space, so it is difficult to effectively repair by conventional methods. After an earthquake, scientifically and reasonably repairing damaged concrete structures has important economic and social benefits. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to propose a cement-based material repair component and a repair method.

[0005] The present invention is implemented as follows: A cement-based material repair component includes a hot melt strip, an electric heating wire, and an expansion bladder. The electric heating wire and the expansion bladder are both arranged inside the hot melt strip. The connection end of the electric heating wire passes out from the outer end of the hot melt strip, and the expansion bladder is filled with a temperature-controlled expansion material.

[0006] Further, a terminal component is installed at the outer end of the hot melt strip. The outer surface of the terminal component is provided with threads. The terminal component is embedded in the outer surface of the cement-based material structure and is tightly combined with it through the threads. The connection end of the electric heating wire passes out from the terminal component.

[0007] Further, a pressure sensor is installed inside the hot melt strip or the terminal component.

[0008] Further, the material of the hot melt strip is hot melt adhesive.

[0009] Further, the temperature-controlled expansion material is a substance that is liquid or solid under normal temperature and pressure. This substance is heated by the electric heating wire to the gasification or sublimation reaction temperature and then changes into a gas, causing the expansion bladder to expand; or the temperature-controlled expansion material is a single solid substance or a mixture. This type of substance generates a large amount of gas when heated by the electric heating wire to the decomposition or chemical reaction temperature, causing the expansion bladder to expand.

[0010] Further, the temperature-controlled expansion material is any one of iodine, sulfur; or alcohol, freon, hydrocarbons; or sodium bicarbonate, calcium carbonate, potassium permanganate.

[0011] Further, the expansion bladder is located at the center of the hot-melt strip and arranged along the axial direction of the hot-melt strip, and the heating wire is located on the outer peripheral side of the expansion bladder.

[0012] A repair method for cement-based materials includes the following steps:

[0013] Step 1: After the cement-based material is vibrated and compacted, a certain number of automatic bonding repair components are embedded at the required positions, and the ends of the heating wire connection terminals need to be exposed on the surface;

[0014] Step 2: After the cement-based material structure is damaged under the action of external loads, connect the ends of the heating wire connection terminals to an external power source. The heating wire heats the hot-melt strip until it melts and causes the expansion bladder to expand; if cracks occur in the cement-based material structure, under the extrusion of the expansion bladder, the melted hot-melt strip penetrates and fills the surrounding structural cracks, re-bonds the cracks in the structure, and completes the repair to restore the bearing capacity; if the cement-based material structure is not damaged, the melted hot-melt strip still stays in its original position and gradually solidifies after the heating wire is powered off for subsequent repair use.

[0015] Compared with the prior art, the present invention has the following beneficial effects: simple structure, reasonable design, small operation space, convenient to use, can repair the cement-based material structure, and is very suitable for underground concealed projects. Description of the Drawings

[0016] Figure 1 It is a longitudinal sectional view of the repair component.

[0017] Figure 2 It is a cross-sectional view of the repair component.

[0018] Figure 3 It is a longitudinal sectional view of the repair component in the case of including the end component.

[0019] In the figure: 1 - hot-melt strip; 2 - heating wire; 3 - expansion bladder; 4 - end component. Detailed Description of the Invention

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] As Figures 1-3 shown, a cement-based material repair member includes a hot-melt strip, an electric heating wire, and an expansion bladder. The electric heating wire and the expansion bladder are both arranged inside the hot-melt strip. The connection end of the electric heating wire passes out from the outer end of the hot-melt strip. The expansion bladder is filled with a temperature-controlled expansion material, and the heating method is resistance heating. When the surrounding structure is damaged and needs to be repaired, the electric heating wire is electrified, and the electric heating wire generates heat by its own resistance, melting the hot-melt strip and causing the expansion bladder to expand.

[0024] The working principle of the repair member is as follows: In underground projects such as concrete pile foundations, tunnels, and dam foundations, when the cement-based material structure is damaged and cracked, it is heated by electricity to melt the hot-melt strip, which infiltrates and fills the surrounding structural fissures under the extrusion of the expansion bladder. On the one hand, the structural cracks are re-bonded to restore the bearing capacity; on the other hand, it prevents groundwater and air from contacting the internal steel bars, thereby preventing local corrosion of the steel bars. At the same time, the repair member only repairs the concrete structure with fissures. For the undamaged concrete structure, the melted hot-melt strip still stays in its original position and still has the repair function in the later stage.

[0025] In this embodiment, a end member is installed at the outer end of the hot-melt strip. The outer surface of the end member is provided with threads. The end member is embedded in the outer surface of the cement-based material structure and is tightly combined with it through the threads. The connection end of the electric heating wire passes out from the end member. The end member can prevent the hot-melt strip from overflowing after melting from the cement-based material structure.

[0026] In this embodiment, a pressure sensor is installed inside the hot-melt strip or the end member, which can measure the pressure of the liquid under the extrusion of the expansion bladder after the hot-melt strip melts. The test signal is transmitted by a wire. According to the reading of the pressure sensor and the expansion characteristics of the heat-expandable / vaporizable material, it is possible to intelligently judge whether there are fissures in the concrete structure, thereby providing a basis and guidance for the overall structure repair.

[0027] The method for judging whether there are fissures in the concrete structure is as follows: When heating by electricity, the expansion bladder expands. If the reading of the pressure sensor continuously increases as the temperature rises, it can be judged that the repair material does not ooze out and there are no fissures around the intelligent repair member; if the reading of the pressure sensor does not continuously increase as the temperature rises, it can be judged that the repair material can ooze out and there are fissures around the intelligent repair member.

[0028] In this embodiment, the material of the hot-melt strip is hot-melt adhesive, which is solid at room temperature and becomes a flowing liquid with certain viscosity when heated to a certain temperature. It solidifies again after the heating stops, thereby sealing the surrounding cracks and isolating the internal steel bars of the structure from the groundwater and air in the structural cracks.

[0029] In this embodiment, the temperature-controlled expansion material is a substance that is liquid or solid under normal temperature and pressure. This substance changes into a gas after being heated by the heating wire to the gasification or sublimation reaction temperature, causing the expansion capsule to expand; or the temperature-controlled expansion material is a single solid substance or a mixture. When this type of substance is heated by the heating wire to the decomposition or chemical reaction temperature, a large amount of gas is generated, causing the expansion capsule to expand.

[0030] In this embodiment, the temperature-controlled expansion material is any one of substances such as iodine and sulfur that sublime from solid to gas after heating; or substances such as alcohol, freon, and hydrocarbons that vaporize from liquid to gas after heating; or substances such as sodium bicarbonate, calcium carbonate, and potassium permanganate that can generate gas through chemical reactions when heated.

[0031] In this embodiment, the expansion capsule is located at the center of the hot-melt strip and is arranged along the axial direction of the hot-melt strip. The heating wire is located on the outer peripheral side of the expansion capsule. After the hot-melt strip melts, the expansion capsule can squeeze it into the surrounding structural cracks.

[0032] A repair method for cement-based materials includes the following steps:

[0033] Step 1: After the cement-based material is vibrated and compacted, a certain number of automatic bonding repair components are embedded at the required positions, and the ends of the heating wire connection terminals need to be exposed on the surface.

[0034] Step 2: After the cement-based material structure is damaged under the action of external loads, the ends of the heating wire connection terminals are connected to an external power source. The heating wire heats the hot-melt strip until it melts and causes the expansion capsule to expand; if cracks occur in the cement-based material structure due to damage, under the extrusion of the expansion capsule, the melted hot-melt strip penetrates and fills the surrounding structural cracks, re-bonding the structural cracks to complete the repair and restore the bearing capacity; if the cement-based material structure is not damaged, the melted hot-melt strip still stays in its original position and gradually solidifies after the heating wire is powered off for subsequent repair use.

[0035] If this patent discloses or involves mutually fixedly connected parts or structural components, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using bolts or screws for connection), or it can also be understood as: a non-detachable fixed connection (such as riveting or welding). Of course, the mutually fixed connection can also be replaced by an integral structure (such as being integrally formed by casting process) (except when it is clearly impossible to use the integral forming process).

[0036] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this patent and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this patent.

[0037] As mentioned above, it is only the preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A cement-based material repair component, characterized in that: It includes a hot-melt strip, a heating wire, and an expansion bladder. The heating wire and the expansion bladder are both arranged inside the hot-melt strip. The connection end of the heating wire passes through the outer end of the hot-melt strip. The expansion bladder is filled with a temperature-controlled expansion material. A terminal member is installed at the outer end of the hot-melt strip. The outer surface of the terminal member is provided with threads. The terminal member is embedded in the outer surface of the cement-based material structure and is tightly combined with it through the threads. The connection end of the heating wire passes through the terminal member. A pressure sensor is installed inside the hot-melt strip or the terminal member. The temperature-controlled expansion material is any one of iodine and sulfur; or alcohol, freon, and hydrocarbons; or sodium bicarbonate, calcium carbonate, and potassium permanganate.

2. The cement-based material repair member according to claim 1, characterized in that: The material of the hot-melt strip is hot-melt adhesive.

3. The cementitious material repair member according to claim 1, characterized in that: The expansion bladder is located at the center of the hot-melt strip and is arranged along the axial direction of the hot-melt strip. The heating wire is located on the outer peripheral side of the expansion bladder.

4. A repair method for a cement-based material, which uses the cement-based material described in claim 1 to repair a component, characterized in that, It includes the following steps: Step 1: After the cement-based material is vibrated and compacted, a certain number of automatic bonding repair members are embedded at the required positions. The ends of the connection ends of the heating wires need to be exposed on the surface. Step 2: After the cement-based material structure is damaged under the action of external loads, the ends of the connection ends of the heating wires are connected to an external power source. The heating wire heats the hot-melt strip until it melts and causes the expansion bladder to expand. If cracks occur in the cement-based material structure, under the extrusion of the expansion bladder, the melted hot-melt strip penetrates and fills the surrounding structural cracks, re-bonds the cracks in the structure, and completes the repair to restore the bearing capacity. If the cement-based material structure is not damaged, the melted hot-melt strip still stays in its original position and gradually solidifies after the heating wire is powered off for subsequent repair use.

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