JP3615524B2 - Peeling protection structure and protection method for concrete frame surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a peeling protection structure and a protective construction method for a concrete frame surface, which is applied when, for example, repairing and reinforcing an existing concrete frame such as a viaduct.
[0002]
[Prior art]
Conventionally, for example, when a viaduct such as a road or a railway is deteriorated or aged, the concrete of the deteriorated or aged part is scraped off, and when a reinforcing bar is exposed, after a rust prevention treatment, for example, FIG. As shown in a), the lacking portion of the concrete casing 51 was filled with a solidified material 52 such as non-shrink mortar and repaired so as to have the original shape. In this case, when the portion to be repaired is large, the consolidated material 52 is filled several times.
[0003]
Also, if the repaired part is large, the repaired part may be peeled off again due to passing vibrations of cars or trains. For example, as shown in FIG. 6B, an adhesive 53 such as an epoxy resin is applied to the surface of the repaired part. After coating, a fiber reinforced sheet 54 such as a vinylon sheet, a carbon sheet, or an FRP cloth sheet was attached and reinforced so as to cover the repaired portion as shown in FIG.
[0004]
However, in the above repair method, the filling material filling operation and the reinforcing sheet laying operation are performed in separate steps, and the reinforcement sheet laying operation must be performed after the filled solidifying material is sufficiently solidified. I must. In addition, there are many cases where the filling operation of the binder is performed in a plurality of times or a plurality of reinforcing sheets must be laminated. Therefore, there are problems such as requiring a lot of labor and time for construction.
[0005]
On the other hand, for example, in repairing a concrete structure in service such as a road or a railroad, it is necessary to perform the construction within a limited construction time, and the construction period is required to be shortened.
Also, since the fiber reinforced sheet is a structure that adheres to concrete with epoxy resin, if there is unevenness in construction, there is a concern that the adhesive surface will gradually loosen due to passing vibrations of cars and trains, and there is a concern that it will be repaired again. Is required. In some cases, painting is performed instead of stretching the fiber reinforced sheet. However, since the paint is rapidly deteriorated, the durability deteriorates and it is necessary to repair it again in the near future.
[0006]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a structure and method for protecting the concrete housing from peeling off, which is easy to construct, durable and reliable.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the concrete frame surface peeling protection structure and protection method according to the present invention are as follows.
[0008]
[Problems to be solved by the invention]
That is, the peeling protection structure on the surface of the concrete frame according to the present invention is such that a protective panel made of a laminate of aluminum and polyethylene resin substantially corresponding to the surface shape is fixed to the surface of the concrete frame to be prevented from peeling off. And a solidified material filled between the surface of the concrete frame and solidified.
[0009]
Further, the method for protecting a concrete housing surface from peeling according to the present invention includes anchoring a protective panel made of a laminate of aluminum and polyethylene resin substantially corresponding to the surface shape to the surface of the concrete housing to be prevented from peeling. The periphery of the protective panel is sealed with a sealing material, and a solidifying material is injected between the protective panel and the surface of the concrete frame to be solidified.
[0010]
Yet another spalling protection method of the concrete skeleton surface according to the invention, prior to the consolidating material filling applied to the concrete skeleton surface to be prevented from flaking, the caking material is cured to the concrete skeleton surface, the surface A protective panel made of a laminate of aluminum and polyethylene resin that substantially corresponds to the shape is anchored, and then the periphery of the protective panel is sealed with a sealing material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete casing surface peeling protection structure and a protection method according to the present invention will be specifically described based on embodiments shown in the drawings.
[0012]
1 to 4 show that the present invention is applied to repair work for an existing viaduct for railways or roads. FIG. 1 is a cross-sectional front view of the viaduct to which the concrete frame peeling protection structure according to the present invention is applied. The side view, FIG. 3 (a) is a partly longitudinal plan view, FIG. 3 (b) is the side view, FIG. 4 (a) is a partly enlarged front view, and FIG. It is an expanded sectional view of the b section in FIG.
[0013]
In the present embodiment, as shown in FIG. 1, a protective panel 3 having an L-shaped cross section substantially corresponding to the surface shape of the surface of the concrete frame 2 at the corner between the outer surface and the lower surface of the balustrade portion 1a of the viaduct 1 to be repaired. Is attached with an anchor 4, and a solidifying material G is filled between the protective panel 3 and the concrete housing 2 and solidified as shown in FIG. In the figure, 1b is a bridge / floor part and 1c is a pier.
[0014]
As the protective panel 3, an Alpolic (registered trademark) plate, which is a laminated plate of aluminum and polyethylene resin, is used in the present embodiment, and a so-called T-shaped anchor is used as the anchor 4. Further, as the above-mentioned consolidated material G, Essaber (trade name) which is a high-flow non-shrink mortar is used.
[0015]
On the outer surface of the viaduct 1, a sound insulation wall 5 is attached with a support 6 made of H-shaped steel and a base plate 8 or the like for fixing it to the outer surface of the viaduct 1 with an anchor 7 or the like. In order to avoid interference with the protective panel 3, the protective panel 3 is provided with a notch 3a as shown in FIGS.
[0016]
In the figure, 9 is a presser plate for fixing the end portion of the adjacent protection panel 3, and in this embodiment, between the two protection panels 3 and 3 provided between the adjacent support columns 6 and 6, and of each support column 6. The presser plates 9 are respectively disposed between the adjacent lower protective panels 3 and 3, and the presser plates 9 are attached to the concrete frame 2 with anchors 10. In this configuration, the end portions of the panels 3 and 3 are sandwiched and fixed.
[0017]
In order to construct the peeling protection structure as described above, for example, construction may be performed in the following manner. First, the surface of the concrete frame 2 at the corners between the outer surface and the lower surface of the bridge girder 1a of the viaduct 1 to be repaired is scraped off and concrete is scraped off, and the rust is treated when the reinforcing bars are exposed. Apply.
[0018]
Next, the protective panel 3 is placed on the surface of the concrete casing 2 and anchored, and the protective panel 3 is processed into a predetermined size in advance at a factory or the like. Alternatively, when using a laminated plate of aluminum and synthetic resin such as the above Alpolic plate, on-site processing is possible, and a long one is cut into a predetermined size and shape at the site. In the case of a panel having an L-shaped cross section, it can be easily and accurately folded by hand at the site.
[0019]
Further, when anchoring, in this embodiment, the anchor mounting hole is formed in the concrete housing 2 by a drill or the like from the anchor mounting hole previously drilled at a predetermined position of the protective panel 3. When the laminated board as described above is used as 3, by directly perforating the protective panel 3 from the surface of the protective panel 3 into the concrete casing 2 with the protective panel 3 temporarily fixed at a predetermined position on the surface of the concrete casing 2. The anchor mounting holes can be easily formed in the protective panel 3 and the concrete frame 2 at the same time.
[0020]
Then, the anchor 4 is placed in the anchor mounting hole of the concrete frame 2 and the protective panel 3 is attached. At that time, if an adhesive such as epoxy resin is attached or injected into the anchor 4 or the mounting hole, The anchor 4 can be more firmly fixed in the anchor mounting hole.
[0021]
Further, a spacer such as a washer (not shown) is interposed between the protective panel 3 and the concrete casing 2 so that the protective panel 3 is placed from the surface of the concrete casing 2 as shown in FIG. It is good to attach in the state (the state which maintained the space | interval of 3 mm in this embodiment) which floated only the fixed quantity. By doing so, it becomes possible to satisfactorily fill the caking material when filling the caulking material described later between the protective panel 3 and the concrete housing 2.
[0022]
In this case, the space retaining spacers are appropriately distributed between the concrete housing 2 and the protective panel 3 or the concrete housing 2 is fitted by fitting ring-shaped space retaining spacers such as washers around the anchor 4. And the protective panel 3 may be interposed. Moreover, although the space | interval of the said protection panel 3 and the concrete frame 2 is appropriate, when using the above high flow non-shrink mortar as said solidification material, what is necessary is just to set to about 2-4 mm.
[0023]
Further, when a plurality of protective panels 3 are arranged side by side as shown in FIGS. 2 and 3 and a presser plate 9 is installed between the adjacent protective panels 3 and 3, the end portions of the adjacent protective panels 3 and 3 are arranged. The presser plate 9 may be put on and fixed with the anchor 10 or the like.
[0024]
Next, a binder injection pipe 11 communicating between the protective panel 3 attached to the surface of the concrete casing 2 and the concrete casing 2 as described above and in a gap between them, and an exhaust pipe 12 if necessary. 4A is provided as shown by the chain line in FIG. 4A, and the entire periphery or substantially the entire periphery of the protective panel 3 is sealed with a sealing material 13 such as silicone or epoxy as shown in FIG. 3B.
[0025]
The injection pipe 11 and the bleed pipe 12 may be formed with a small hole in the protective panel 3 and connected and fixed to the small hole. In particular, when the laminated plate as described above is used as the protective panel 3. The small holes as described above can be easily formed in the field. Further, when the gap between the protective panel 3 and the concrete housing 2 is vertically oriented as shown in the illustrated example, the injection pipe 11 is as low as possible in the gap, and the exhaust pipe 12 is as high as possible. It is desirable to provide in.
[0026]
Then, the solidified material G is injected into the gap from the injection pipe 11, and the high flow non-shrink mortar as described above is used as the solidified material G, so that the space between the protective panel 3 and the concrete frame 2 is obtained. Even if the gap is narrow, it can be satisfactorily and satisfactorily filled, and even when the concrete housing 2 has cracks or the like, it can be satisfactorily penetrated into it.
[0027]
When the consolidation material G is filled in the gap between the protective panel 3 and the concrete housing 2 as described above, the air in the gap is sequentially discharged from the vent pipe 12 and the consolidation material is placed in the gap. Is sufficiently filled, it can be confirmed that the consolidated material overflows from the vent pipe 12 and the consolidated material is sufficiently filled.
[0028]
In this state, the injection pipe 11 and the exhaust pipe 12 are pulled out and removed, and the consolidated material G in the gap is solidified, so that the consolidated material G, the concrete frame 2 and the protective panel 3 are excellent. It is integrated.
[0029]
The vent pipe 12 is not necessarily provided. For example, a part of the sealing material 13 around the protective panel 3 is removed, or an opening is provided without being provided from the beginning, or the protective panel is used for venting. A small hole may be formed, and the evacuation of the air in the gap and the confirmation of the filling of the consolidated material may be performed by the small hole or the opening.
[0030]
In the above embodiment, the protective panel 3 is attached to the surface of the concrete frame 2 and then the consolidated material G is filled between the protective panel 3 and the concrete frame 2. The protective panel 3 may be attached after the binder G is filled, and an example of the construction process in that case will be described in order.
[0031]
First, in the same manner as in the above embodiment, the deterioration of the surface of the concrete frame 2 at the corners between both outer surfaces and the lower surface of the bridge girder 1a of the viaduct 1 to be repaired or scraped away the concrete, and the steel bars were exposed. In some cases, rust prevention treatment is applied.
[0032]
Next, the protective panel 3 is temporarily arranged at a predetermined position on the surface of the concrete frame, and an anchor position is marked on the surface of the protective panel 3 so as not to interfere with the reinforcing bar embedded in the concrete frame 2, and a pilot hole is drilled.
[0033]
Next, after removing the protective panel 3 from the surface of the concrete housing 2 and applying a mortar adhesion primer to the surface of the concrete housing 2, the concrete missing portion is filled and applied with a solidified material G such as premix mortar and repaired. In addition, a concrete neutralization inhibitor such as an aqueous lithium nitrite solution is applied to the surface of the consolidated material G and the surface of the casing as necessary.
[0034]
Then, the protective panel 3 is rearranged at a predetermined position on the surface of the concrete frame in a soft state before the above-mentioned solidified coating material G is hardened, and the hole of the protective panel 3 is drilled with a drill or the like with the drilling depth marked. After drilling from the top to the marking position, the anchor 4 is driven and the protective panel 3 is attached to the concrete housing 2 with the consolidated material G sandwiched between the protective panel 3 and the concrete housing 2.
[0035]
Next, after removing the solidified material G protruding from the peripheral edge of the protective panel 3, if necessary, a presser plate 9 is installed between the adjacent protective panels 3 and 3 and fixed with an anchor 10 or the like. The entire periphery or substantially the entire periphery of the panel 3 may be sealed with a sealing material 13 such as silicone or epoxy as shown in FIG.
[0036]
The above-mentioned solidified material G may be filled and applied only to the missing part of the concrete, or may be filled and applied to substantially the entire surface of the casing on which the protective panel 3 is installed. What is necessary is just to set the application | coating thickness of the solidification materials G other than the said missing part to about 3-5 mm. In that case, it is advisable to interpose a spacer such as a washer between the concrete housing 2 and the protective panel 3 as appropriate. The spacer is a solidified material applied to the surface of the concrete housing before the protective panel 3 is installed. Disperse and adhere to the surface of G. Or when attaching the protection panel 3 with the anchor 4, it can also be made to interpose between the concrete housing 2 and the protection panel 3 by fitting the ring-shaped space | interval holding spacer which consists of a washer etc. around the anchor.
[0037]
Each of the above embodiments is applied to a viaduct in which the lower surface of the balustrade part 1a is inclined as shown in FIG. 1, but can also be applied to a viaduct in which the lower surface of the balustrade part 1a is substantially horizontal as shown in FIG. Yes, it can also be applied to those having no sound insulation wall as shown in FIG.
[0038]
Furthermore, it is applicable not only to viaducts, but also to concrete frames such as ordinary concrete bridges and buildings, and other various buildings or structures, and is not limited to repairing or repairing existing concrete frames. The present invention can also be applied for the purpose of preventing the casing from peeling off.
[0039]
【The invention's effect】
As described above, the peeling protection structure and the protection method on the surface of the concrete frame according to the present invention have the above-described configuration, and thus the following effects can be obtained.
(1) For example, it is possible to easily perform simultaneously the filling work of the solidified material such as the cross-sectional repair of the concrete frame (backfilling of the concrete defect portion) and the joining operation of the protective panel to the solidified material simultaneously in one process. , Construction time and labor can be reduced. In particular, when a laminated plate of aluminum and a synthetic resin such as an Alpolic plate is used as the protective panel, it is possible to make a hole from above, so that a hole for anchor placement or filler injection can be easily provided. As a result, the degree of construction freedom increases. In addition, since laminated plates such as Alpolic plates can be freely colored, they are excellent in aesthetics. In particular, when this is used for a high bridge or the like, the design can be restored or renewed at the same time as repairing as a structural frame. Furthermore, since the laminated plate such as the Alpolik plate is lightweight, the burden on the structure is small, and the anchor for attaching it is light and small.
(2) When a laminated board such as an Alpolic board is used as a protective panel, it is excellent in workability. For example, when it is applied to a corner of a concrete frame, it can be easily processed into an L shape with a small curvature and solidified. When a high-flow non-shrink mortar is used as the material, the fluidity is good, so that the gap with the housing surface can be extremely reduced. For example, when a steel plate is bent and used as a protective panel, the steel plate is inferior in flexibility, so it is difficult to follow the shape of the structure, and the structure has an error in construction. A gap of about 3 cm is required, but a laminated board such as an Alpolic board has good flexibility and can follow a slight error of a building, so that it can be constructed only by providing a gap of about 3 mm. Therefore, only a small amount of filler is required, and further weight reduction and construction time can be shortened, resulting in excellent economic efficiency.
(3) According to the present invention, since construction can be performed in a short time, repair work on a railway, road, etc. in service becomes possible.
(4) Since the protective panel is attached to the concrete frame with an anchor, there is no concern about peeling of the adhesive interface due to secular change and uneven construction as in the case of bonding the conventional fiber reinforced sheet. In addition, since it is strong against vibrations, it can be stably peeled off for a long time against vibrations of vehicles such as railways and roads.
(5) Since the concrete frame can be prevented from coming into contact with carbon dioxide in the air by covering the parts of the concrete frame that may be peeled off with a protective panel, the neutralization of the concrete is progressing. Can be suppressed, and the lifetime of the structure can be extended. In particular, when a laminated plate of aluminum and a synthetic resin such as an Alpolic plate is used as the protective panel, there are effects that the corrosion resistance of the protective panel itself is improved and the durability can be further increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view of a viaduct to which a peeling protection structure according to the present invention is applied.
FIG. 2 is a side view of the viaduct,
FIG. 3A is a longitudinal plan view of a part of the viaduct.
(B) is a side view thereof,
FIG. 4A is an enlarged cross-sectional front view of a part of the viaduct.
(B) is an expanded sectional view of the b part in (a).
FIG. 5 is a cross-sectional front view of another example viaduct to which the present invention is applied.
6A to 6C are explanatory views of a conventional peeling protection method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Viaduct 1a Railing part 1b Bridge and floor slab part 1c Bridge pier 2 Concrete frame 3 Protection panel 4, 7, 10 Anchor 5 Sound insulation wall 6 Support column 8 Base plate 9 Holding plate 11 Injection pipe 12 Exhaust pipe 13 Sealing material G Bonding material

Claims (4)

A protective panel made of a laminate of aluminum and polyethylene resin, which roughly corresponds to the surface shape, is fixed to the surface of the concrete body that should be prevented from peeling off, and a solidified material is filled between the protective panel and the surface of the concrete body. Detachment protection structure on the surface of a solid concrete body. After anchoring a protective panel made of a laminate of aluminum and polyethylene resin substantially corresponding to the surface shape on the surface of the concrete frame to be prevented from peeling off, the periphery of the protective panel is sealed with a sealing material, and the protective panel A method for protecting the surface of a concrete body from peeling, wherein a solidification material is injected between the surface of the concrete body and the surface of the concrete body to be solidified. 3. A method for protecting a concrete frame from peeling off according to claim 2, wherein a high fluidity non-shrink mortar is used as the consolidated material. Caking material filling applied to the concrete skeleton surface to be prevented from flaking, before the consolidation material is cured to the concrete skeleton surface, made of a laminate of a substantially corresponding aluminum and polyethylene resin on the surface shape A method for protecting a concrete frame from peeling off, characterized in that after the protective panel is anchored, the periphery of the protective panel is sealed with a sealing material.

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