JP3975240B2 - Renovation method for high structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention repairs, reinforces and improves functions of high structures such as recovery of strength reduction due to deterioration of high structures such as piers, pillars, tanks or chimneys constructed of concrete and steel, prevention of deterioration, seismic reinforcement, etc. It relates to the repair method of high structures constructed by construction.
[0002]
[Prior art]
Concrete structures and steel structures deteriorate over time due to various material and structural factors, cracks occur, internal rebars corrode, and cross-sectional defects occur due to corrosion, resulting in reduced structural strength. Therefore, it is necessary to make repairs and reinforcements as necessary. Conventionally, rehabilitation of high structures such as piers, pillars, tanks or chimneys that have a continuous plane in the vertical direction, a large scaffold with the same height as the high structure is built from the ground or an unstable moving scaffold is used. I was doing it. In particular, in order to renovate the pier a and the like installed in the water, it was necessary to perform a renovation work by installing a water-stop sheet pile c and performing a temporary closing and making it dry (see FIG. 7). In addition, conventional refurbishing methods include a method of installing a precast concrete plate, a method of installing a steel plate, a method of winding a chemical fiber sheet such as carbon fiber, a method of spraying mortar, and a method of applying a chemical material. It was. In particular, as a method for preventing corrosion of steel, a coating method is frequently used, and examples thereof include painting, organic lining, and inorganic lining.
[0003]
[Problems to be solved by the invention]
As described above, the conventional high structure repair method has the following problems.
<I> It is usually necessary to provide a large-scale scaffold for rehabilitation of high structures. In particular, in order to renovate a high structure installed in the water, ancillary work such as provisional deadline becomes large, and a great amount of cost and work period are required. Also, high-rise scaffoldings and temporary deadlines are affected by wind and rain and waves, so it is necessary to carefully implement safety measures and work time is likely to be limited.
<B> When the above method is used, it is necessary to remove the temporary structure, which causes the construction period to be prolonged.
<C> In a method of installing a precast concrete plate or a method of installing a steel plate or the like, usually, plate materials having the same thickness are butted and joined. For this reason, the joint part tends to be a weak part, and when reinforcing with a reinforcing plate or the like, the wall thickness of the joint part becomes thicker than the other part and protrudes, so the outer periphery of the high structure that was flat before the repair is It cannot be kept flat.
<D> In the anticorrosion method by coating, it is necessary to apply the coating after the surface of the steel material is lifted off and the deposits such as shellfish are removed to smooth the surface. For this reason, it takes a lot of labor and time for the base work.
[0004]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a method for repairing a high structure that does not require a large-scale scaffolding or a closing work. Moreover, it aims at providing the repair method of the high structure which can ensure the quality which matched the objective of the repair of the high structure easily. It is another object of the present invention to provide a method for repairing a high structure that can ensure highly safe work and is less likely to be limited in work time due to changes in weather. Furthermore, it aims at providing the repair method of the high structure which can maintain the outer periphery of the repaired high structure in a plane, without a junction part becoming a weak part.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the high structure repair method of the present invention is the high structure repair method for constructing one of the above-described high structure repair structures. After the outer periphery of the object is surrounded by the first-stage structure panel, the first-stage structure panel is moved downward or upward along the high-structure object, and another one is placed on the upper end or lower end of the moved first-stage structure panel. By connecting the structural panels, a second-stage structural panel surrounding the outer periphery of the high structure is constructed, and the first-stage structural panel and the second-stage structural panel are moved downward or upward, and the structure is the same as above. After the construction and movement of the panel are repeated and the high structure is covered with a predetermined number of structural panels, a flexible tube is attached to the inner periphery of the structural panel arranged at the lowermost level, and the lowermost structural panel is After being placed in position, the flexible tube The gap between the inner surface of the lowermost structural panel and the high structure is closed by injecting a bonding material from an injection hose connected to the flexible hose, and the flexible tube is provided by injecting the bonding material from the injection hose. It is also possible to fill the bonding material between the high structure and the structural panel by opening the pressure valve.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
<A> Structural Panel The structural panel 2 is composed of a basic panel, a reinforcing layer 213, and an adhesive. The structural panel 2 is formed by sandwiching a reinforcing layer 213 between two basic panels and integrating them with an adhesive. Different materials can be used for the basic panels sandwiching the reinforcing layer 213. The basic panel can also be formed by overlapping a plurality of panels. The basic panel is a plate material used to protect the reinforcing layer 213 and increase the rigidity of the structural panel 2. As the basic panel, high strength concrete, fiber reinforced concrete, flexible board, polyolefin fiber reinforced panel, or the like can be used. If a cement-based material (such as concrete or mortar) such as high-strength concrete is used, the basic panel can be easily formed into an arbitrary shape. For this reason, even if the high structure 1 has a curved shape, a suitable structural panel 2 can be easily formed. For example, a high-strength, high-fluidity cement material in which water and premix cement and fine aggregate, polyolefin fiber, high-performance water reducing agent, etc. are mixed can be used.
[0008]
The flexible board has cement and organic fibers (pulp) as main components, and after kneading them, it is formed into a roll and dehydrated and pressed. As this high-strength flexible board, a well-known product can be used, and an easily available product is a standard product having a thickness of 3 mm to 6 mm. The flexible board can be easily manufactured in the factory, the quality of the product is stable, the bending strength is as large as 30 (N / mm ² ) or more, the surface does not crack, and it has non-flammability. There is an advantage from the viewpoint. Furthermore, it can be easily bent, etc., and can be molded into a desired shape according to the curvature, and the construction is such that workability and transportation are easy because the specific gravity is as light as 1.6 to 1.8. There is also an advantage in terms of sex.
[0009]
The polyolefin-based fiber reinforced panel is a panel formed by mixing polyolefin-based reinforcing fibers, cement, and organic fibers. Here, pulp or the like is used as the organic fiber. The polyolefin-based fiber reinforced panel is a product having a thickness of about 3 mm to 15 mm, and is very thin and light compared to a normal precast concrete plate. For this reason, the size per panel can be increased and the workability is excellent. Further, forming such as bending can be easily performed.
[0010]
The polyolefin-based reinforcing fiber is a fiber material made of a polyolefin-based material such as polypropylene, polyethylene, or polybutene. Among these, polyolefin-based reinforcing fibers using polypropylene as a raw material are particularly suitable. The polyolefin-based reinforcing fiber is formed to a length of, for example, about 6 to 30 mm and used as a short fiber. In addition, the surface of the polyolefin-based reinforcing fiber is subjected to a special embossing process so as to be uneven. As a result, it is difficult for the cement to come off and the bending toughness (stickiness) of the panel is improved. Further, the surface shape of the polyolefin-based reinforcing fiber is subjected to a hydrophilic treatment to increase the interfacial adhesive force with the cement matrix. Polypropylene is hydrophobic so that its surface does not blend with water when it is untreated, so that the strength and toughness of the panel can be improved by applying a hydrophilic treatment. The tensile strength of the polyolefin-based reinforcing fiber is 400 to 480 (N / mm ² ), and the strength characteristics and various physical properties of the panel can be improved. Polyolefin-based reinforcing fibers made of polypropylene as a raw material have excellent alkali resistance, do not rust, and do not generate nitrogen, sulfur or chlorine-based harmful gases during combustion. Furthermore, since the specific gravity is as light as 0.91, the panel can be reduced in weight.
[0011]
<B> Unit Panel and Connection Panel The unit panel 21 is a panel constituting the structural panel 2. The structural panel 2 is constructed by joining a plurality of unit panels 21. The unit panel 21 includes two basic panels and a reinforcing layer 213 sandwiched therebetween. The basic panel disposed on the high structure side is referred to as an inner panel 211, and the basic panel disposed on the outer periphery is referred to as an outer panel 212. Both ends of the inner panel 211 protrude from the outer panel 212 (see FIG. 3). When constructing the structural panel 2, the adjacent inner panels 211 are joined together. The joining between the inner panels 211 may be via a known joint joint. The basic panel installed in the gap between the outer panels 212 and 212 generated when the unit panels 21 and 21 are joined is the connection panel 22. A reinforcing layer 213 may be attached to the inside of the connection panel 22 as necessary. According to this connection method, since the connection part 22 covers the joint part between the unit panels 21 and 21, the structural panel 2 can be firmly integrated and constructed.
[0012]
<C> Reinforcing layer The reinforcing layer 213 is a sheet-like or plate-like material disposed to increase the strength of the structural panel 2. For the reinforcing layer 213, for example, a carbon fiber sheet, an aramid fiber sheet, a polyethylene fiber sheet, a polypropylene fiber sheet, a glass fiber sheet, a vinylon fiber sheet, or the like can be used. Here, various fiber sheets can use a well-known single orientation sheet, what laminated | stacked the single orientation sheet alternately like a plywood, a cross-shaped thing, etc. can be used. When various fiber sheets are used as the reinforcing layer 213, it is necessary to use a material or a weaving method in which at least the adhesive penetrates in order to impregnate the adhesive. Here, the impregnation means that a liquid substance (adhesive) is infiltrated into the voids in order to modify the porous object (fiber sheet). The impregnation with the adhesive may be performed in advance before the unit panel 21 or the connection panel 22 is manufactured, or may be performed during the manufacturing.
[0013]
Here, the carbon fiber sheet has a specific gravity of 1.7 to 1.8 and is lightweight, has a property not to rust, and in the fiber direction is 5000 to 6000 (N / mm ²⁾ which is about 5 to 6 times the reinforcing bar. ) Has a large tensile strength. Therefore, a structural strength equal to or higher than that of reinforced concrete can be obtained with a thin film by disposing a carbon fiber sheet between high-strength basic panels. Note that the reinforcing layer 213 can be formed by stacking a plurality of the above-described sheets.
[0014]
<D> Adhesive Any kind of adhesive may be used as long as it can be integrally formed by firmly joining the basic panel and the reinforcing layer 213 and the reinforcing layer 213 and the connection panel 22. From the viewpoint of adhesive strength and workability, an epoxy resin is preferable. Other adhesives include vinyl acetate resin, EVA (ethylene vinyl acetate copolymer resin), acrylic resin, and other rubber adhesives, and chloroprene rubber, styrene / butadiene rubber, and other rubber adhesives. It is also possible to use an adhesive or a water / air-hard adhesive such as cement or gypsum.
[0015]
<E> Joining Material The joining material 3 is a material that is interposed between the structural panel 2 and the high structure 1 to integrate both. Any material can be used as long as it can be integrated, but high strength non-shrink mortar is preferable from the viewpoint of adhesive strength and workability. Other bonding materials 3 include epoxy resin, EVA (ethylene vinyl acetate copolymer resin), polymer resin, vinyl acetate resin, silicone, acrylic resin, and other adhesives such as chloroprene. It is also possible to use rubber-based adhesives such as rubber-based or styrene / butadiene rubber-based or water / air-based adhesives such as cement-based or gypsum-based.
[0016]
The method for repairing a high structure of the present invention is suitable for repairing a high structure 1 having a continuous plane in the vertical direction such as a pier 1a, a steel pipe pile 1b, a column, a tank or a chimney constructed of concrete or steel. ing. Hereinafter, the repair method of the steel pipe pile 1b which supports the pier 1a and the jetty 52 is demonstrated, referring drawings.
[0017]
<I> Method of repairing piers (Figs. 1 and 2)
When the pier 1a constructed in water is repaired on the water, it is necessary to secure a scaffold for constructing the structural panel 2. The scaffold may be a suspended scaffold 62 suspended from the bridge girder 51, or a ship floating on the water may be used. In any case, in the present invention, it is only necessary to prepare a small-scale scaffold as compared with the height of the high structure 1. First, if necessary, the deteriorated portion of the surface of the pier 1a is removed, and the first-stage structural panel 2 is assembled at a predetermined position. The assembly of the structural panel 2 is performed in the order of installation and joining of the unit panel 21 and attachment of the connection panel 22 (see the upper half of FIG. 2). A spacing member 4 is attached to the inner surface of the inner panel 211 of the unit panel 21 as necessary. After the assembly of the first-stage structural panel 2 is completed, the first-stage structural panel 2 is suspended by the height of the panel. The movement of the structural panel 2 can be performed by hanging it with a crane or the like, or it can be performed using a known moving rail attached in advance. Then, the unit panel 21 is joined to the upper end of the first-stage structural panel 2 to construct the second-stage structural panel 2. For joining the first-stage and second-stage structural panels 2, it is possible to employ a method of using a known joint or a connection panel 22 connecting the unit panels 21. When the connection panel 22 is used, the inner panel 211 protrudes from the outer panel 212 at the upper and lower ends of the unit panel 21. Then, the assembly and movement of the structural panel 2 are repeated for a predetermined number of steps. After the construction and movement of all the structural panels 2 are completed, the lower end of the lowermost structural panel 2 is closed. Depending on the structure of the pier 1a, it may be possible to close the structure panel 2 simply by placing it on the bottom plate of the pier 1a. If the bottom plate is buried in the ground, the bottom plate may be exposed in advance by washing or underwater excavation. Moreover, the sealing operation | work of the lower end can also be performed from the outer side of the structure panel 2 by a diving operation | work etc. Finally, the bonding material 3 is filled between the structural panel 2 and the pier 1a (see the lower half of FIG. 2). Underwater, water pressure acts from the outside of the structural panel 2 and can counter the filling pressure of the bonding material 3, so that the bonding material 3 can be filled without special reinforcement. A protrusion such as a diver can be attached to the surface of the inner panel 211 on the side of the pier 1a as necessary to increase the adhesion.
[0018]
<B> Method of repairing steel pipe piles (Figs. 4 and 5)
A method of repairing the steel pipe pile 1b that supports the pier 52 and the like at sea will be described for the purpose of corrosion prevention and the like. In this case as well, the repair can be performed only by using a simple scaffold such as the suspension scaffold 62 as in the repair of the pier 1a. In the same manner as above, assembly and movement are repeated in order from the first-stage structural panel 2a to construct a plurality of structural panels 2a, 2b, 2c, 2d, 2e, and 2f (see FIG. 4). The joining between the respective stages is performed using the joint protrusion 214 and the connection panel 22 assembled in an annular shape (see FIG. 5). In addition, since the structural panel 2 is often thin, a reinforcing ring 215 or the like can be provided as necessary. The structure panel 2 is moved using, for example, the hanging wire 61.
[0019]
A flexible tube 4 is attached to the lower part of the first-stage structural panel 2a arranged at the lowest level. The flexible tube 4 is preferably kept deflated until the final movement is completed, so that the movement of the structural panel 2 is not obstructed. After the construction of the structural panel 2 is completed, the bonding material 3 is filled into the flexible tube 4 by the injection hose 31 to close the gap between the inner surface of the lowermost structural panel 2a and the steel pipe pile 1b.
[0020]
In the flexible tube 4, for example, a discharge port 41 that discharges the bonding material 3 and a pressure valve 42 that covers the discharge port 41 are provided. The pressure valve 42 is, for example, an annular band member having a notch. When the flexible tube 4 expands and the internal pressure increases, the pressure valve 42 is pushed up by the pressure of the bonding material 3. It flows out from the side (see FIG. 6). When the injection is finished, the pressure valve 42 is pushed down by the weight of the bonding material 3 and the discharge port 41 is closed. If the cushioning material 43 is affixed to the surface of the flexible tube 4 on the steel pipe pile 1b side, it serves as a protective material when the flexible tube 4 expands. It is preferable that an injection hose 31 is connected to the flexible tube 4 so that the bonding material 3 can be injected from the water (see FIG. 4).
[0021]
<C> Other Examples In the above description, the example in which the structural panel 2 assembled on the water is lowered into the water has been described. However, the application of the present invention is not limited to this. For example, when repairing a high pier or the like installed in a chimney or a canyon, the structural panel 2 can be assembled on the ground and sequentially raised upward. Then, after the construction of all the structural panels 2 is completed, the bonding material 3 is filled from below or above.
[0022]
【The invention's effect】
Since the high structure repair structure and the high structure repair method according to the present invention are as described above, the following effects can be obtained.
<A> No large scale scaffolding or deadline construction is required. For this reason, it is possible to repair high structures in a short time and economically. It is also possible to work in a safe place.
<B> Since high-quality panels produced in the factory can be used, the work on site is minimized, and a high-quality high-structure repair structure can be constructed.
<C> Since the joint portion of the unit panel installed on the inside is closed with the connection panel, the joint portion can be formed on a flat surface and the joint portion does not become a weak portion.
<D> Since a panel having a composite structure is used, the strength and material can be freely adjusted according to the required strength, shape, or usage environment.
<E> Since a structural panel is constructed at a certain location and the structural panel constructed in the height direction is simply moved, a high-rise scaffolding is constructed according to the high structure, or the scaffold is moved along the high structure. There is no need to
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of an embodiment of a method for repairing a high structure according to the present invention.
FIG. 2 is a cross-sectional view showing a repair method for a high structure in the upper half and a repair structure for the high structure in the lower half.
FIG. 3 is an explanatory diagram of an embodiment in which unit panels are connected.
FIG. 4 is an explanatory diagram of an embodiment of a method for repairing a steel pipe pile of a pier.
FIG. 5 is a sectional view of an embodiment of a steel pipe pile repair method.
FIG. 6 is a perspective view of an embodiment of a cut flexible tube.
FIG. 7 is an explanatory diagram of an embodiment of a conventional pier repair method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... High structure 2 ... Structural panel 21 .. Unit panel 211. Inner panel 212. Outer panel 213. Reinforcement layer 22 .... Connection panel 3 .... Joining material 31 ... Injection hose 4 .... Flexible tube 42 ・ ・ Pressure valve

Claims (1)

  After surrounding the outer periphery of the high structure with a first-stage structure panel at a predetermined position,
  Move the first-stage structural panel downward or upward along the high structure,
  By constructing a second-stage structural panel that surrounds the outer periphery of the high structure by joining another structural panel to the upper or lower end of the moved first-stage structural panel,
  Move the first-level structural panel and the second-level structural panel downward or upward,
  After repeating the construction and movement of the structural panel in the same manner as described above and covering the high structure with the predetermined number of structural panels,
  Attach a flexible tube to the inner periphery of the structural panel placed at the bottom,
  After the lowermost structural panel is arranged at a predetermined position, the gap between the inner surface of the lowermost structural panel and the high structure is closed by injecting a bonding material from an injection hose connected to the flexible tube. ,
  Further, by injecting a bonding material from an injection hose, the pressure valve provided in the flexible tube is opened, and the bonding material is filled between the high structure and the structural panel. Refurbishment method.

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