JP4170512B2 - Method for improving the quality of concrete structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for improving the quality of a concrete structure.
[0002]
[Prior art and problems to be solved by the invention]
A concrete structure has a problem that cracking occurs due to shrinkage of the concrete structure during curing, shrinkage due to temperature change or drying, deterioration over time, and the like.
[0003]
By the way, the location where the reinforcing bars are arranged inside the concrete structure is often the part where the load acting on the concrete structure is the largest, and filling the cracks generated in this part will improve the quality of the concrete structure. Connected.
[0004]
Therefore, for example, a method of injecting a solidifying material such as cement or synthetic resin from a crack reaching the surface of a concrete structure has been proposed. In this method, however, a place away from the injection portion, that is, a concrete structure The solidified material does not reach the inside, and as a result, only cracks in the surface layer are eliminated, and the problem of fundamental cracks is not solved.
[0005]
In addition, for example, in a method of burying a pipe in a concrete structure and allowing the solidifying material to reach the inside of the concrete structure via the pipe, the burying of the pipe is troublesome, and the concrete structure If the pipe is not stretched around, the cracks of the entire concrete structure cannot be filled, and if the pipe is stretched around the concrete structure, the strength of the concrete structure is reduced. .
[0006]
The present invention solves the problem of cracks in the concrete structure described above, and uses the drainage material for removing excess water proposed in Japanese Patent Application Laid-Open No. 10-266570 relating to the prior application of the present inventors. It is intended to provide a method for improving the quality of concrete structures with excellent practicality and workability by injecting solidification material into the objects.
[0007]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0008]
A method for improving the quality of a concrete structure 4 in which a structural member 3 provided with a drainage function by providing a water-absorbing drainage material 2 such as a nonwoven fabric or a sponge to the structural material 1 is provided. After the excess water in 4 is removed using the drainage material 2 and the concrete structure 4 is hardened, a solidified material 5 such as cement or synthetic resin is used for the concrete structure 4 using the drainage material 2. This is a method for improving the quality of a concrete structure, which is injected into the concrete structure and fills cracks in the concrete structure 4 with the solidifying material 5.
[0009]
The method for improving the quality of a concrete structure according to claim 1 , wherein after the excess water is removed and the concrete structure 4 is hardened and shrinkage cracks of the concrete structure 4 occur, the solidified material 5 Is injected into the concrete structure 4 using the drainage material 2, and relates to a method for improving the quality of a concrete structure.
[0010]
3. The method for improving the quality of a concrete structure according to claim 1 or 2 , wherein a low-concentration solidified material 5 containing a large amount of moisture is injected into the concrete structure 4 using the drainage material 2. Then, a high-concentration solidifying material 5 having a low water content is injected into the concrete structure 4 using the drainage material 2, and the method for improving the quality of a concrete structure is characterized.
[0011]
Further, in the method for improving the quality of a concrete structure according to any one of claims 1 to 3 , before injecting the solidified material 5 into the concrete structure 4 using the drainage material 2, water is added. Is injected into the concrete structure 4 to check the crack path or to clean the inside of the crack, which relates to a method for improving the quality of a concrete structure.
[0012]
The method for improving the quality of a concrete structure according to any one of claims 1 to 4 , wherein a tubular separator 6 penetrating the concrete structure 4 is formed in the concrete structure 4, and the separator 6 in which according to the pipe and the front Symbol structural member 3 provided on the concrete structure 4 to a high quality process of the concrete structure, characterized by being configured so as to communicate.
[0013]
[Action and effect of the invention]
Cement (for example, a fine particle cement having an average particle size of 8 μm or more and 10 μm or less and a maximum particle size of 40 μm or an ultrafine particle cement having an average particle size of 3 μm or more and 4 μm or less and a maximum particle size of 10 μm) or a synthetic resin (for example, epoxy resin, When the solidifying material 5 is used as the solidified material 5 and the solidified material 5 is injected into the concrete structure 4 using the drainage material 2 provided on the structural material 1, the drainage material 2 originally has water permeability. For this reason, the solidifying material 5 reaches the inside of the concrete structure 4 well, and the solidifying material 5 fills the cracks in the concrete structure 4 well.
[0014]
Since the present invention is as described above, it is a method for improving the quality of a concrete structure excellent in practicality and workability capable of easily and reliably filling a crack in the concrete structure.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The drawings illustrate one embodiment of the present invention and are described below.
[0016]
In this embodiment, a concrete structure 4 in which a structural member 3 provided with a drainage function by providing a drainage material 2 having a water absorption property such as a nonwoven fabric or a sponge to a structural material 1 such as a reinforcing bar or continuous fiber reinforcing material is provided. In this method, a solidifying material 5 such as cement or synthetic resin is injected into the concrete structure 4 using the drainage material 2.
[0017]
The concrete structure 4 is provided with a drainage material 2 when the concrete structure 4 is formed as disclosed in Japanese Patent Application Laid-Open No. 10-266570 according to the prior application of the present inventors, and the concrete is poured around the drainage material 2. A concrete structure 4 in which a drainage material 2 is disposed is formed, and the drainage material 2 is used to remove excess water in the concrete structure. It was proposed to achieve
[0018]
As shown in FIG. 1, the drainage material 2 is provided in a state of being wound around a group of structural materials 1 composed of a plurality of structural materials 1, provided in a state of being attached to the structural material 1, or on the outer surface of the structural material 1. The structural member 3 is formed in a wound state.
[0019]
2 to 4 show other structural examples of the structural member 3.
[0020]
The structural member 3 illustrated in FIG. 2 is provided with a drainage material 2 having a water absorption property such as a nonwoven fabric or a sponge on the outer periphery of a structural material 1 such as a reinforcing bar or continuous fiber reinforcing material.
[0021]
The structural member 3 illustrated in FIG. 3 is a tubular structural material 1 provided with a hole 7 that appropriately communicates a hollow portion and an outer peripheral portion, and a drainage material 2 provided in the hollow portion.
[0022]
The structural member 3 illustrated in FIG. 4 is a structure in which a concave portion is appropriately provided in the outer peripheral portion of the structural material 1 and a drainage material 2 is provided in the concave portion.
[0023]
The drainage material 2 or the structural member 3 is provided in an inclined state, a horizontal state, or a vertical state in the concrete structure 4.
[0024]
In FIG. 1, a drainage material 2 is provided on the outer periphery of a structural material 1 extending in the vertical direction to form a structural member 3, and the drainage material 2 is spirally wound around the structural member 3 group. It is a configuration.
[0025]
The concrete structure 4 is provided with a tubular separator 6 penetrating the concrete structure 4 so that the pipe of the separator 6 and the drainage material 2 or the structural member 3 provided in the concrete structure 4 communicate with each other. It is configured. The separator 6 is for removing excess water in the concrete structure 4 to the outside of the concrete structure 4 using the drainage material 2 and the separator 6. In this embodiment, the separator 6 is arranged in parallel in upper and lower stages. Yes.
[0026]
In addition, how to provide the drainage material 2, the structural member 3 or the separator 6 inside the concrete structure 4 can be set as appropriate, and a method of combining the structural material 1, the drainage material 2, the structural member 3 or the separator 6 The combination structure can also be set as appropriate.
[0027]
As the solidifying material 5, a cement-based fine particle cement having an average particle diameter of 8 μm or more and 10 μm or less and a maximum particle diameter of 40 μm, or an ultrafine particle cement having an average particle diameter of 3 μm or more and 4 μm or less and a maximum particle diameter of 10 μm is used. Moreover, an epoxy resin, a urethane resin, etc. are employ | adopted as a synthetic resin system.
[0028]
The particle size of the solidifying material 5 is appropriately set according to the assumed crack width. The particle size of the injectable solidifying material 5 is said to be 1/3 of the width of the crack, and when an ultrafine particle cement is used, even a crack of about 30 μm can be filled. In addition, since there are structural voids such as cracks in the concrete structure 4 that serve to prevent freezing, the solidified material 5 is not filled with the structural voids so that the fine structural voids remain. The particle size may be set. In addition, the cement system is more suitable than the synthetic resin system from the viewpoints of economy, fire resistance, heat resistance, strength, and the like, and it is easy to be familiar with the concrete structure 4, but the concrete structure 4 has physical properties other than concrete. In some cases, it is preferable to use a synthetic resin system.
[0029]
Hereinafter, the present embodiment will be further described in detail.
[0030]
Concrete is cast in a mold (not shown) to form a concrete structure 4. First, from the opening 6 ′ of the separator 6 through the drainage material 2 and the structural member 3 in the concrete structure 4. Remove excess water from concrete.
[0031]
Subsequently, after the concrete structure 4 is hardened, a solidifying material 5 is injected into the concrete structure 4.
[0032]
The same applies to the improvement of the quality of the concrete structure 4 by injecting the solidifying material 5 after the concrete structure 4 has deteriorated. In addition, if the solidifying material 5 is injected before the concrete structure 4 is cured, the solidifying material 5 may increase cracks.
[0033]
The method for injecting the solidifying material 5 into the concrete structure 4 will be described in more detail.
[0034]
The time for injecting the solidifying material 5 into the concrete structure 4 is optimal after the excess water is removed and after the concrete structure 4 is hardened, the shrinkage cracks of the concrete structure 4 occur. In this case, since the concrete structure 4 is hardened, the injection pressure of the solidifying material 5 can be increased, and the solidifying material 5 injected into the concrete structure 4 is injected into the cracks of the concrete structure 4 to provide concrete. The solidifying material 5 can reach the deep part of the structure 4.
[0035]
After the concrete structure 4 is hardened and the formwork is removed, the opening 6 'of the separator 6 used for removing the excess water is closed except for a predetermined portion, and the predetermined portion (the opened separator) 6 is injected through the opening 6 '). If the separator 6 is not employed, the solidifying material 5 is injected from the drainage material 2 exposed on the surface of the concrete structure 4.
[0036]
The location where the solidifying material 5 is injected is preferably the opening 6 ′ of the separator 6 positioned below the concrete structure 4, and the solidifying material 5 is spread throughout the concrete structure 4.
[0037]
Further, the solidifying material 5 to be injected may be a low-concentration solidifying material 5 having a high water content at first, and then a method of injecting a high-concentration solidifying material 5 having a low water content may be employed. In this case, the cement and synthetic resin particles in the solidified material 5 can reach even fine cracks by the solid material 5 having a high amount of water injected first. Alternatively, first, water may be simply injected into the concrete structure 4 to check the crack path and to clean the inside of the crack.
[0038]
By the above method, the solidifying material 5 may be injected into the entire concrete structure 4 in one step, and when the concrete structure 4 is large or has a complicated shape, while changing the injection place, The solidifying material 5 may be gradually poured into the concrete structure 4 in a plurality of steps.
[0039]
When the solidifying material 5 is injected from the opening 6 ′ of the separator 6 by the above method, the solidifying material 5 penetrates well into the concrete structure 4 along the separator 6 and the drainage material 2. The cracks in 4 are filled and the cracks are filled, so that a high-quality concrete structure 4 is obtained.
[0040]
In the figure, reference numeral 8 is a storage tank for storing the solidified material 5, and 9 is an injection pump.
[0041]
Since the present embodiment is as described above, the solidifying material 5 is satisfactorily injected into the concrete structure 4 via the separator 6 and the drainage material 2, and the cracks in the concrete structure 4 are filled well. This is a method for improving the quality of concrete structures with excellent practicality and workability.
[0042]
Further, since the solidifying material 5 is injected using the separator 6 and the drainage material 2, the solidifying material 5 is well injected around the structural material 1 on which the load acts most in the concrete structure 4 to fill the cracks. As a result, the strength of the concrete structure 4 increases accordingly, and the quality of the concrete structure is excellent in practicality.
[0043]
Further, since the solidifying material 5 blocks the drainage path of the separator 6 and the drainage material 2, the strength of the concrete structure 4 is increased accordingly. However, it is possible to prevent the occurrence of such a problem and to improve the quality of the concrete structure with excellent practicality.
[0044]
Further, since the solidifying material 5 is injected after the excess water in the concrete structure 4 is removed, the quality of the concrete structure 4 is improved by removing the excess water, and the quality of the concrete structure 4 is injected by injecting the solidifying material 5. It becomes the quality improvement method of the concrete structure which can obtain the extremely high-quality concrete structure 4 by the effect of both, and is further excellent in practicality.
[0045]
In addition, since the solidified material 5 is injected into the concrete structure 4 after the placed concrete 4 is hardened, the injected solidified material 5 can fill the cracks satisfactorily without increasing the cracks. This is a method for improving the quality of a concrete structure that is even more practical.
[0046]
In addition, although the present Example demonstrated the concrete structure 4 in which the structural member 3 which provided the drainage material 2 in the structural material 1 was provided in the inside, if it is the concrete structure 4 in which the drainage material 2 was provided in the inside, Anything can be applied.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a partial cross-sectional side view of an example.
FIG. 2 is an explanatory sectional view showing an example of a structural member 3 of the present embodiment.
FIG. 3 is an explanatory cross-sectional view showing an example of a structural member 3 of the present embodiment.
FIG. 4 is an explanatory cross-sectional view showing an example of a structural member 3 of the present embodiment.
FIG. 5 is an explanatory sectional plan view of the present embodiment.
FIG. 6 is an explanatory partial cross-sectional side view of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Structural material 2 Drainage material 3 Structural member 4 Concrete structure 5 Solidification material 6 Separator

Claims (5)

  A method for improving the quality of a concrete structure in which a structural member provided with a water-absorbing drainage material such as non-woven fabric or sponge is added to the structural material and disposed therein, and the excess water in the concrete structure is provided. After the concrete structure is cured using the drainage material, a solidifying material such as cement or synthetic resin is injected into the concrete structure using the drainage material, and the solidification material is used for the solidification material. A method for improving the quality of a concrete structure characterized by filling cracks in the concrete structure. The method for improving the quality of a concrete structure according to claim 1 , wherein after the excess water is removed and the concrete structure is hardened and shrinkage cracks of the concrete structure occur, the solidified material is used as the drainage material. A method for improving the quality of a concrete structure, wherein the method is used for pouring into the concrete structure. 3. The method for improving the quality of a concrete structure according to claim 1 , wherein a low-concentration solidified material containing a large amount of moisture is injected into the concrete structure using the drainage material, A method for improving the quality of a concrete structure, characterized by injecting a small amount of high-concentration solidified material into the concrete structure using the drainage material. The method for improving the quality of a concrete structure according to any one of claims 1 to 3 , wherein water is injected into the concrete structure before the solidifying material is injected into the concrete structure using the drainage material. A method for improving the quality of a concrete structure, characterized in that it is injected into a crack to confirm the crack path or to clean the inside of the crack. The method for improving the quality of a concrete structure according to any one of claims 1 to 4 , wherein a tubular separator penetrating the concrete structure is formed in the concrete structure, and the inside of the separator and the concrete structure are formed. quality method of the concrete structure, characterized by being configured and pre Symbol structural member provided in the object so as to communicate.

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