JP2007132151A - Protector of exposed reinforcing steel and its protection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of easily covering exposed and protruding reinforcing steels with protectors and obtain high rust preventive effects by improving the tight contact between exposed reinforcing steels and protectors. <P>SOLUTION: A tubular body 4 is provided, which has an insertion hole 2 at one end for inserting exposed reinforcing steel 11 through it, and a suction hole 3 at the other end for sucking air within the tubular body 4, for covering the reinforcing steel with the tubular body 4. After tightly sealing the clearance between the insertion hole 2 and the exposed reinforcing steel 11, air within the tubular body 4 is sucked through the suction hole 3 to reduce the pressure within the tubular body 4 and compress the tubular body 4 into a tight contact with the exposed reinforcing steel 11. The suction hole 3 is tightly closed to protect the exposed reinforcing steel 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a protective material for exposed reinforcing bars protruding from a structure and a method for protecting the same.

  For example, when constructing a reinforced concrete structure, the construction may be temporarily suspended or the construction may be performed partially or stepwise. In such a case, a part of the reinforcing bars necessary for fixing or the like may be left for a long time in a state of protruding from the structure and exposed. Reinforcing bars tend to rust in an environment with water and oxygen. If exposed to the outside air for a long period of time, inspection / treatment of the reinforced steel rusted part is required when the work is resumed, and if the exposed steel rust is rusted, there is a serious problem in durability of the structure.

  Therefore, conventionally, protection has been performed by applying or spraying an anticorrosive agent to the exposed reinforcing bar, or covering it with a tubular vinyl and sealing the opening with a gum tape or the like.

Moreover, what formed the synthetic resin film which has a heat shrinkability and the property to hydrolyze with an alkali in the shape of a tube is considered as a protective material for rust prevention of an exposed reinforcing bar. After covering the exposed reinforcing bars with the protective material for rust prevention, it shrinks when it is heated to the specified temperature and adheres to the exposed reinforcing bars, preventing rainwater intrusion and contact with the condensed water reinforcing bars to prevent rusting. It is what. Then, concrete is placed with the exposed rebars attached and hydrolyzed by the alkali to eliminate the removal work (see, for example, Patent Document 1).
JP 2002-61392 A

  However, the application and spraying of the rust preventive agent to the exposed reinforcing bars requires a great deal of labor. In addition, if the cylindrical vinyl opening is simply wound with gummed tape or the like, air remains in the vinyl, so that when the sunlight hits, the air inside the vinyl is warmed to cause dew condensation inside. This moisture and the high temperature environment in the vinyl is the worst environment for the reinforcing bars to promote the generation of rust.

  Further, even with a protective material that heat-shrinks the film, the operation of heating the film over the entire surface to a predetermined temperature is troublesome. And since the heating operation is likely to be uneven and the adhesion to the reinforcing bars tends to be insufficient, the above-mentioned problem of internal condensation occurs. In addition, when a part of the film remains on the reinforcing bar surface without being hydrolyzed even after the concrete is placed, there is a concern about the influence on the adhesion characteristics of the reinforcing bar and the problem of durability due to the mixing of foreign matter into the concrete.

  The object of the present invention is to make it easy to cover the exposed rebar protruding from the structure with a protective material, and to improve the adhesion between the exposed rebar and the protective material to obtain a high rust prevention effect. is there.

  In order to solve the above problems, the invention according to claim 1 is a protective material 1 for an exposed reinforcing bar 11 that protects an exposed reinforcing bar 11 protruding from a structure 10, for example, as shown in FIGS. A cylindrical body 4 is formed so as to cover the exposed reinforcing bar 11 and is compressed when the inside is decompressed, and is in close contact with the exposed reinforcing bar 11. The exposed reinforcing bar 11 is formed on one end side of the cylindrical body 4. A gap between the insertion port 2 and the exposed reinforcing bar 11 is sealed. The insertion port 2 is inserted into the cylindrical body 4, and the gap between the insertion port 2 and the exposed reinforcing bar 11 is sealed. An insertion port sealing means 5 and a suction port sealing means (check valve 6) for sealing the suction port 3 are provided.

  As described above, the cylindrical body 4 formed so as to cover the exposed reinforcing bars 11 is compressed when the inside thereof is decompressed and is brought into close contact with the exposed reinforcing bars 11, thereby removing air from the surroundings of the reinforcing bars. The insertion port sealing means 5 and the suction port sealing means seal the gap between the insertion port 2 and the exposed reinforcing bar 11 and the suction port 3 so that air does not enter the cylindrical body 4. . The operation of covering the exposed reinforcing bars 11 with the protective material 1 is not as troublesome as the operation of applying, spraying or heating as in the prior art, but the air inside the cylindrical body 4 is sucked and the cylindrical body 4 is sucked. This can be done simply by sealing both sides. Furthermore, since the internal air is sucked and the cylindrical body 4 is completely adhered to the exposed reinforcing bars 11 without unevenness, the occurrence of internal dew condensation can be prevented and the rust prevention effect can be enhanced.

  As shown in FIG. 1, for example, as shown in FIG. 1, the invention described in claim 2 is a protective member 1 for the exposed reinforcing bar 11 according to claim 1. The elastic member 5b is disposed along the outer periphery of the insertion port 2 between the fastener 5a.

  As described above, the elastic member 5b is provided along the outer periphery of the insertion port 2, and the elastic member 5b is fastened by the fastener 5a, so that the insertion port 2 and the exposed reinforcing bar 11 can be securely adhered and fixed. . Therefore, it is possible to reliably prevent air from entering the inside of the cylindrical body 4 when or after sucking the air inside the cylindrical body 4.

  According to a third aspect of the present invention, for example, as shown in FIG. 1, in the protective material 1 for the exposed reinforcing bar 11 according to the first or second aspect, the suction port sealing means is a check valve that prevents backflow of air. It is 6, It is characterized by the above-mentioned.

  As described above, by arranging the check valve 6 in the suction port 3, the inside of the cylindrical body 4 finishes sucking air and is sealed, so that a manual sealing work can be omitted.

  The invention according to claim 4 is a method for protecting the exposed reinforcing bar 11 that protects the exposed reinforcing bar 11 protruding from the structure 10, for example, as shown in FIG. 2, in order to insert the exposed reinforcing bar 11 at one end side. A cylindrical body 4 in which an insertion port 2 is formed and a suction port 3 for sucking air inside is formed on the other end is covered with the exposed reinforcing bar 11, and the insertion port 2 and the exposed reinforcing bar 11 are After the gap is sealed, the inside of the cylindrical body 4 is sucked from the suction port 3 to reduce the pressure, the cylindrical body 4 is compressed and brought into close contact with the exposed reinforcing bar 11, and the suction port 3 is sealed. The exposed rebar 11 is protected.

  In this manner, in the state where the exposed reinforcing bar 11 is covered with the cylindrical body 4 and the insertion port 2 is sealed, the air inside the cylindrical body 4 is sucked to compress the cylindrical body 4 so as to adhere to the suction port 3. Is sealed so that air is excluded from the surroundings of the reinforcing bars so that the air does not enter the cylindrical body 4. A simple method of sucking and sealing the air inside the cylindrical body 4 without performing troublesome operations such as applying, spraying, or heating the entire surface of the exposed rebar 11 as in the prior art. Can be done by work. Then, by sucking the air inside, the cylindrical body 4 can be brought into close contact with the exposed reinforcing bar 11 without any unevenness, the occurrence of internal condensation can be prevented, and the rust prevention effect can be enhanced.

  According to the present invention, the exposed reinforcing bar projecting from the structure is covered with a cylindrical body so that the air inside is sucked into close contact with the exposed reinforcing bar, so that the exposed reinforcing bar can be covered with a protective material with a simple operation. Adhesion with the protective material is improved, and a high rust prevention effect can be obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In this embodiment, the exposed reinforcing bar 11 protruding from the reinforced concrete structure 10 in the middle of construction is protected by the protective material 1.

  First, the protective material 1 for the exposed rebar 11 according to the present invention will be described. As shown in FIG. 1, the protective material 1 includes a cylindrical body 4 formed so as to cover the exposed reinforcing bars 11. An insertion port 2 for inserting the exposed reinforcing bar 11 is formed on one end side of the cylindrical body 4, and a suction port 3 for sucking internal air is formed on the other end side. Further, the protective material 1 includes an insertion port sealing means 5 that seals a gap between the insertion port 2 and the exposed reinforcing bar 11, and a suction port sealing means that seals the suction port 3.

  As shown in FIG. 2, the cylindrical body 4 is compressed and sucked into the exposed reinforcing bars 11 when the air inside is sucked. That is, the material of the cylindrical body 4 has airtightness that does not allow the inside and outside to be ventilated, compressibility that shrinks when the inside is decompressed, and adhesion that does not create a gap along the surface of the exposed rebar 11 when compressed. is there. For example, examples of the cylindrical body 4 include tubes made of synthetic resin such as nylon and polyethylene. This material is also excellent in durability against sunlight (ultraviolet rays) and wind and rain.

  As shown in FIG. 1B, the insertion port sealing means 5 is for preventing the inflow of outside air from the insertion port 2 and keeping the insertion port 2 sealed. In the present embodiment, the insertion port sealing means 5 includes a fastener 5 a that fastens and fixes the insertion port 2 to the exposed reinforcing bar 11, and an outer periphery of the insertion port 2 between the fastener 5 a and the insertion port 2. It consists of the elastic material 5b provided.

  The fastener 5 a is a belt-like thing curved in a substantially circular shape corresponding to the outer shape of the exposed reinforcing bar 11. The exposed rebar 11 can be tightened by narrowing its inner diameter. For example, as the fastener 5a, a generally used clamp or the like can be used. The clamp is such that one end of the base body and the movable arm body are pivotally connected to each other, and the other end of the movable arm body that is opened is tightened with a bolt or the like.

  The elastic member 5b is deformed by tightening the fastener 5a, and the inner surface of the insertion port 2 is brought into close contact with the surface of the exposed reinforcing bar 11 without a gap. Examples of the material of the elastic material 5b include urethane resin.

  As shown in FIG. 1 (a), the suction port sealing means is for preventing the outside air from flowing in from the suction port 3 and maintaining the sealed state of the cylindrical body 4. In the present embodiment, the suction port sealing means is a check valve 6 that prevents backflow of air.

  As the check valve 6, for example, using a pressure difference between the inside and the outside, a check piece that is a molded product is closed so as to be fitted to the neck provided on the inner surface of the tubular body 4, the tubular body 4. And the like, in which the inner surfaces of the flat cylindrical valves provided on the inner surface of each of them are closed closely.

  Next, a method for protecting the exposed reinforcing bars 11 using the protective material 1 configured as described above will be described. As shown in FIG. 2, the cylindrical body 4 of the protective material is placed on the exposed reinforcing bar 11 from the insertion port 2 side.

  After covering the cylindrical body 4, the gap between the insertion opening 2 and the exposed reinforcing bar 11 is sealed. This sealing is performed by placing a fastener 5a provided with an elastic material 5b on the inner surface on the outer surface of the insertion port 2, and tightening the fastener 5a so that the insertion port 2 is in close contact with the reinforcing bar.

  Then, the air inside the cylindrical body 4 is mechanically sucked by a known suction device and is forcibly discharged. When the inside is depressurized, the cylindrical body 4 comes into close contact with the surface of the exposed reinforcing bar 11 without a gap.

  When the cylindrical body 4 is sufficiently adhered to the exposed reinforcing bar 11, the suction port 3 is sealed. This sealing is performed by the check valve 6 disposed inside the suction port 3 at the same time when the suction device is stopped.

  As a result, the tubular body 4 comes into close contact with the exposed reinforcing bars 11 to exclude air from the surroundings of the reinforcing bars, and the insertion port 2 and the suction port 3 are sealed so that the air does not enter the tubular body 4. The exposed reinforcing bar 11 can be easily covered only by sucking the air inside the cylindrical body 4 covered on the exposed reinforcing bar 11 and sealing both sides of the cylindrical body 4. Moreover, it is possible to reduce the damage of the protective material 1 without being feared of falling off the exposed reinforcing bars 11 due to wind and rain. And in order to make the cylindrical body 4 contact | adhere to the exposed reinforcement 11 completely, until the construction is restarted, it prevents the intrusion of rainwater and the contact with water due to internal condensation, and rusts the exposed reinforcement 11 It can be surely prevented.

  And since the elastic material 5b is fastened with the fastener 5a along the outer periphery of the insertion port 2, the insertion port 2 and the exposed reinforcing bar 11 can be securely adhered and fixed, and the air inside the cylindrical body 4 can be fixed. When sucking or after sucking, it is possible to reliably prevent air from entering the cylindrical body 4. Further, since the check valve 6 is disposed in the suction port 3, the inside of the cylindrical body 4 is sealed while being completely sucked in air, so that a manual sealing work can be omitted.

  Further, the suction port and the suction port sealing means may be configured integrally. For example, in another embodiment shown in FIG. 3, the integrated valve 16 is attached to the side surface of the end of the cylindrical body 14 and includes a suction port and a check valve communicating with the inside of the cylindrical body 14 at the center. It is what. If it is this form, the opening part of the cylindrical body 14 will be only the insertion port 2, and it will become easy to ensure the airtightness after suction.

  In addition, in the above embodiment, although the protective material 1 was made into the cylindrical shape, it should just be made cylindrical when covering the exposed reinforcing bar 11, and may be flat in other than that. Further, the insertion port sealing means 5 may be attached after the exposed reinforcing bar 11 is covered with the cylindrical body 4 or may be attached in advance to the outer surface of the insertion port 2. Furthermore, the elastic member 5b may be attached in advance to the inner surface side of the fastener 5a or the outer surface side of the insertion port 2. The suction port sealing means may be a fastener disposed on the inner surface of the suction port 3, a clip sandwiched from the outside, or the like.

  Of course, the protective material 1 can cope with the unevenness even if there is a protrusion such as a node on the surface of the reinforcing bar. Further, in order to remove the protective material 1 from the exposed reinforcing bars 11, the insertion port sealing means 5 may be released and the inside of the tubular body 4 may be filled with outside air. In addition, it is needless to say that specific detailed structures and the like can be appropriately changed.

It is a perspective view which shows the structure of the protection material of the exposed reinforcement of one Embodiment to which this invention is applied. It is sectional drawing for demonstrating the protection method of the exposed reinforcement of one Embodiment to which this invention is applied. It is principal part sectional drawing for demonstrating other embodiment to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Protective material 2 Insertion port 3 Suction port 4, 14 Cylindrical body 5 Insertion port sealing means 5a Fastener 5b Elastic material 6 Check valve (suction port sealing means)
16 Integrated valve (suction port, suction port sealing means)
10 Structure 11 Exposed Rebar

Claims (4)

It is a protective material for exposed rebar that protects the exposed rebar protruding from the structure,
A cylindrical body that is formed so as to cover the exposed rebar, is compressed when the inside is decompressed, and is in close contact with the exposed rebar,
An insertion port for inserting the exposed reinforcing bar formed on one end side of the cylindrical body, a suction port for suctioning air inside the cylindrical body formed on the other end side,
An exposed rebar protective material comprising: an insertion port sealing means for sealing a gap between the insertion port and the exposed reinforcing bar; and a suction port sealing means for sealing the suction port.   The insertion port sealing means includes a fastener that fastens and fixes the insertion port to the exposed reinforcing bar, and an elastic material provided along the outer periphery of the insertion port between the fastener. The exposed reinforcing bar protective material according to claim 1.   3. The exposed reinforcing bar protective material according to claim 1, wherein the suction port sealing means is a check valve that prevents backflow of air. A method of protecting an exposed reinforcing bar that protects an exposed reinforcing bar protruding from a structure,
An insertion port for inserting the exposed rebar is formed on one end side, and a cylindrical body having a suction port for sucking air inside is formed on the other end side. After sealing the gap with the exposed rebar,
The inside of the cylindrical body is decompressed by sucking air from the suction port, the cylindrical body is compressed and brought into close contact with the exposed rebar, and the suction port is sealed to protect the exposed rebar. A method for protecting exposed rebars.

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