JP2002147028A - Sealed space press-fitting hardening repairing method for concrete building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, surely and inexpensively repair a floating wall in a repairing method of a sealed space generated by the floating wall of a deteriorated concrete building. SOLUTION: An injection port 22 and an anchor hole adjusted to a fastening metal fitting 26 are bored toward a building frame from a surface of the concrete building in a part of a floating layer, and a nut 28 is fastened to an anchor fixed to building frame concrete 10 by using the fastening metal fitting 26. While enhancing the extension of the close contact area and close contact force by the fastening adjustment, the sealed space S is press-fitted, hardened and repaired by an adhesive injected from the injection port 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a hardened space in an aged concrete building by pressure bonding in a closed space.

[0002]

2. Description of the Related Art Recently, in a building such as an aged concrete building, a mortar layer or the like on a surface thereof rises from a skeleton layer and may fall by some impact. Has been turned. Conventionally, the method of repairing the floating wall has been to fill a gap between the floating wall portion by resin injection.
In some cases, the floating wall was knocked down and a new mortar was repaired.

[0003]

In the resin injection method, complete repair was not possible due to insufficient adhesion between concrete and a mortar layer serving as a floating wall. On the other hand, it would be costly to knock down the entire floating wall and rebuild the construction anew, and the construction period would be as long as new construction, and in addition, the parts that were peeled once would often fall again. .

Accordingly, an object of the present invention is to make it possible to easily and reliably repair a concrete floating wall at low cost.

[0005]

According to the first aspect of the present invention, there is provided a method for repairing an enclosed space caused by a buried layer in a concrete structure and a mortar layer in a concrete building. Enlarges the contact area by drilling an injection hole and an anchor hole from the surface of the object toward the skeleton to match the fastening hardware, and using the anchor holes to adjust the fastening of the fastening hardware attached to the skeleton concrete with a nut. And performing a press-hardening repair with an adhesive injected into the sealed space from the injection port while increasing the adhesion.

The operation and effect of the first aspect of the present invention will be described. An injection hole and an anchor hole are drilled from the concrete surface, an adhesive is injected into the closed space from the injection hole, and the anchor is fixed to the anchor using a clamp. Tighten the nuts and adjust the tightening condition to make the floating layer in the mortar layer adhere to the surface of the skeleton, enlarge the adhesion area, and bond and harden the floating layer in the mortar layer to the surface of the skeleton with the adhesive injected earlier. As a result, the state of the floating layer can be eliminated, and the repair of the enclosed space of the concrete structure that has become the floating layer can be realized.

According to the second aspect of the present invention, the permeable primer which cures by a two-liquid reaction is injected as an injecting agent, and after the base of the surface to be adhered is reinforced, the adhesive is pressurized and cured. A method for repairing an enclosed space pressure hardening of a concrete building as described.

[0008] The function and effect of the invention described in claim 2 is as follows. After the base of the surface to be bonded is strengthened by injecting a permeable primer which cures by a two-liquid reaction as an injecting agent, the adhesive is press-hardened. Thereby, a stronger bonding state is obtained, and more ideal repair of concrete is realized.

According to the third aspect of the present invention, a permeable primer which is hardened by a foaming two-liquid reaction is injected as an injecting agent, and after the base of the surface to be bonded is reinforced, the adhesive is press-hardened. Item 7. A method for repairing a concrete space by pressure bonding hardening of a concrete building according to item 1.

The function and effect of the invention of claim 3 will be described. Injecting a permeable primer which is hardened by a foaming two-liquid reaction as an injecting agent, strengthens the base on the surface to be bonded, and then presses the adhesive. By curing, the adhesiveness of the adhesive is enhanced as in the second aspect, and more robust concrete repair is realized.

According to the fourth aspect of the present invention, there is provided a method for repairing a concrete building in a closed space by pressure bonding, wherein a permeable primer which is cured by a foaming two-liquid reaction is used as an adhesive. Provided.

According to the fourth aspect of the present invention, the use of a permeable primer which is cured by a foaming two-liquid reaction enhances the adhesiveness of the adhesive and improves the adhesiveness. Has the effect of doing

According to the fifth aspect of the present invention, the repair of the floating mortar layer having the decorative tile on the surface and the skeleton concrete is carried out by using the fastening fitting. A method is provided.

The operation and effect of the invention of claim 5 will be described. In the floating mortar layer having a decorative tile on the surface,
By using the fastening metal, the decorative tile can be brought into close contact with the building concrete together with the floating mortar layer, and the floating mortar layer on which the decorative tile has been applied is repaired. According to the present invention, effective repair in a building with the decorative tile applied It can be performed.

According to a sixth aspect of the present invention, there is provided the method for repairing a concrete building in a closed space by pressure bonding, wherein an anchor bolt is screwed into a hole anchor.

According to the sixth aspect of the present invention, the use of the anchor bolt facilitates the work of tightening the fastener.
This has the effect of improving workability.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a concrete building under repair, FIG. 2 schematically shows a cross-sectional view, 10 shows a concrete skeleton, and a portion of the skeleton 10 is normal. In addition, concrete is formed from cement, sand, gravel, and water, and a reinforcing bar (not shown) is provided as needed.

Reference numeral 12 denotes a portion of the top of the building frame, 14 is a surface layer in a portion that cannot be seen from the front of the building, and these portions 12, 14 are mortar layers made of cement, sand and water, and 16 is a mortar layer. This is a tile in a part seen from the front of the building, and has a mortar layer 18 on the inner surface side. Joints 20 are formed between adjacent tiles. When building the building, the mortar layer 18 on the back of the tile 16 and the building 10
However, as the building deteriorated, the mortar layer 18 and the building 10
2, the mortar layer 18 floats from the skeleton 10 as shown in FIG. 2, and an internal space S sealed from the outside may be formed.

The method of the present invention for re-adhering the mortar layer 18 which has become a floating wall to the surface of the frame 10 as shown in FIG.
An opening (injection port of the present invention) 22 is formed in a portion of the mortar layer 18 by using a tool such as a vibration drill. Next, one or more anchor holes are drilled in the skeleton using a tool such as a vibration drill so as to straddle the opening 22, and an anchor bolt or a hole anchor is attached to the anchor holes.
The fastening fitting 26 is applied to the tile surface from the front, and the pair of nuts 28 is lightly screwed into the anchor.

Next, the primer is injected by inserting the nozzle 24 into the opening 22 through the opening 26-1 of the clamp 26 as shown by the arrow. The injected still liquid primer accumulates in the space S between the mortar layer 18 and the skeleton 10, but only fills the space below it due to gravity and forms an air layer above the liquid level. As the primer, a foamable two-liquid reaction type comprising a main agent having high permeability to the concrete layer and a curing agent is preferable. For example, a primer having a product name of "Polytile" manufactured by Daido Paint Co., Ltd. can be used. .

Next, the anchor bolt 28 is inserted from the outside into the anchor embedded in the frame 10 on both sides as described above, and the anchor bolt 28 is screwed into the anchor. As the screwing of the anchor bolts 28 progresses, the portions of the mortar layer 18 and the tiles 16 that have become floating walls are
0, and in the final fastening state of the anchor bolt 28, as shown in FIG.
The portion that has become the floating wall is pressed against the surface of the frame 10.
Due to the pressing of the mortar layer 18, the still liquid primer injected into the space S in the previous process is evenly spread over the entire surface of the skeleton 10 facing the mortar layer 18, and under the permeability, the priming of the skeleton 10 is prevented. It also penetrates into the concrete layer that composes.

After a lapse of, for example, 10 minutes required for the permeation of the injected primer, the bolt 28 is loosened (it is not necessary to completely remove the bolt). Since the mortar layer 18 which has become a floating wall has not yet been bonded just by being subjected to the primer treatment, it is separated from the frame 10 again as in FIG.
After leaving, it cures in, for example, 1-2 hours. In this state, the nozzle 24 is introduced again through the openings 26-1 and 22 and an adhesive such as an epoxy adhesive for bonding the mortar layer 18 and the concrete layer 10 is injected. The adhesive is filled in the space S between the skeleton 10 and the mortar layer 18. After filling the space S with the adhesive, the bolt 28 is screwed and fastened to the embedded anchor again. As the screwing of the anchor bolts 28 progresses, the portions of the mortar 18 and the tiles 16 that have become floating walls are pressed again toward the frame 10, and in the final fastening state of the anchor bolts 28,
As shown in FIG. 3 again, the portion of the floating wall of the mortar layer 18 is pressed against the surface of the frame 10. The unsolidified epoxy adhesive injected into the space S by the pressing of the mortar layer 18 is spread over the front surface of the frame 10 facing the mortar layer 18, and the primer is applied to this surface. In the cured state of the epoxy adhesive, the affinity with the concrete layer increases, so the concrete skeleton 1
0 and the mortar layer 18 are firmly bonded. FIG. 4 shows that after the bonding operation has been completed, the fasteners have been removed and the remaining openings 22,
26 shows a state where the portion 26-1 is repaired with an appropriate filler 30.

[Brief description of the drawings]

FIG. 1 is a front view of a concrete structure during a repair work.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1 and shows a state when a primer or an adhesive is injected.

FIG. 3 is similar to FIG. 2, but showing the state during solidification of the primer or adhesive.

FIG. 4 is similar to FIG. 2, but shows a state after completion of the repair work.

[Description of Signs] 10 ... Concrete body 12 ... Kasagi 16 ... Tile 18 ... Mortar layer 22 ... Injection port 26 ... Clamping fitting 28 ... Nut (for anchor screw)

Claims (6)

[Claims] 1. A method for repairing a closed space caused by a floating layer in a concrete body and a mortar layer in a concrete building, wherein an injection hole is provided at a portion of the floating layer from a surface of the concrete structure toward a frame to a frame. The anchor hole was drilled and the tightening adjustment of the fasteners attached to the skeleton concrete using the anchor hole was performed with a nut, so that the injection area was injected into the closed space while increasing the adhesion area and increasing the adhesion force. A method of performing pressure bonding repair using an adhesive. 2. The closed space crimping of a concrete building according to claim 1, wherein a permeating primer which cures by a two-liquid reaction is poured as an injecting agent, and the adhesive is pressurized and hardened after strengthening the base of the surface to be bonded. Cure repair method. 3. The concrete building according to claim 1, wherein a permeable primer which is hardened by a foaming two-liquid reaction is injected as an injecting agent, and after the base of the surface to be bonded is reinforced, the adhesive is press-hardened. Sealed space pressure curing cure repair method. 4. The method according to claim 1, wherein a permeable primer which is cured by a foaming two-liquid reaction is used as an adhesive. 5. The method according to claim 1, wherein a fastening metal fitting is used for repairing the floating mortar layer having a decorative tile on its surface and the skeleton concrete. 6. The method according to claim 1, wherein the anchor bolt is screwed into the hole anchor.