JP6966676B2 - Crack repair method - Google Patents

Description

The present invention relates to a crack repair construction method for repairing and building of concrete building frame, a crack generated in the bonded tiles or the like on the surface of the concrete skeleton.

As repairs when cracks occur on the outer wall of a building, there are methods such as the U-cut method and the method of applying liquid resin to the surface of the crack, but both repair the surface of the crack and even the inside of the crack. Cannot be repaired. Therefore, for example, the construction methods described in Patent Documents 1 to 3 have been developed so that the inside of the crack can be repaired.

In Patent Document 1, a connecting passage is formed diagonally in the object to be treated (concrete structure) so as to lead to the processing space (crack), and the supply system and the suction system of the curable material are provided on the surface side of the object to be treated. Is disclosed, and a method of allowing a curable material of a supply system to enter the processing space of an object to be processed by suction through a suction system and curing the material is disclosed.

In Patent Document 2, a core material pipe having a tapered thick portion at one end and an external thread at the other end, and a collar having a large outer diameter portion at one end are mounted in series, and a core material is internally attached to the other end of the core material pipe. A washer formed by screwing a nut having an internal thread corresponding to the external thread at the other end of the pipe is inserted from one end of the core material pipe into a hole formed diagonally from the surface of the skeleton for a crack generated in the skeleton. , A method of injecting into a crack by a continuous change in the pressure of an adhesive reservoir tube of an injector connected to a nut is disclosed.

Patent Document 3 describes hydraulic pressure in a through hole formed so as to penetrate a crack inside a construction structure from a position different from the position where a crack is formed on the surface of the construction structure, for example, at an angle of about 45 degrees. The crack surface is repaired by injecting a filler solution supplied via a pump and a liquid feed hose from an injector, and the injection device further includes an air compressor and an air supply hose for injecting air. As a result, an air-inducing drug solution injection method is disclosed in which the filling drug solution is injected so as to be guided by the air while injecting air.

Japanese Unexamined Patent Publication No. 2007-277809 Japanese Unexamined Patent Publication No. 2000-291266 Japanese Unexamined Patent Publication No. 11-50669

In each of the methods described in Patent Documents 1 to 3, the cracks are filled with resin or the like without gaps by holes drilled diagonally with respect to the cracks. Therefore, in the repaired structure, the strength of the crack portion filled with the resin or the like is high, but the peripheral portion of the crack filled with the resin or the like is in the same state as the structure before the repair. Cracks will occur in the peripheral portion of the cracks filled with resin or the like.

Therefore, in the present invention, cracks to be precursors generated, tightly integrated, including up to the peripheral portion of the crack, and to provide a crack repair construction method capable of preventing the re-occurrence of cracks ..

The crack repair method of the present invention is a crack repair method for repairing a crack generated in a skeleton, in which a perforated hole intersecting with a crack is formed from the surface of the skeleton to the inside of the skeleton, and an adhesive is applied to the perforated hole. It is characterized by injecting and inserting a pin into the perforated hole into which the adhesive has been injected to connect the skeleton before and after the perforated hole to intersect the crack.

According to the crack repair method of the present invention, the adhesive injected into the perforated hole intersecting the crack penetrates not only into the perforated hole but also into the crack through the perforated hole, and the adhesive is cured. The inside of the crack is repaired, and the pin inserted in the hole where the adhesive is injected crosses the crack to connect the skeletons before and after the hole, and it is firmly integrated including the peripheral part of the crack. Be made.

The perforated holes may be formed so as to intersect with the cracks, but since the cracks generally enter the thickness direction of the skeleton, it is desirable to form the perforated holes diagonally with respect to the surface of the skeleton. At this time, the drilling hole can be easily formed by using a jig that sets the angle of the bit of the drilling drill to a predetermined angle with respect to the surface of the skeleton.

Further, it is desirable that the perforated hole is formed so as to intersect the crack at the central portion in the thickness direction of the skeleton. As a result, the adhesive injected into the perforated hole is injected into the crack from the central portion in the thickness direction of the crack frame, and the adhesive can be permeated into the entire crack.

Further, it is desirable that the perforated holes are formed from positions that are staggered with the cracks sandwiched along the cracks on the surface of the skeleton. As a result, the pins inserted in the alternating directions across the crack are fixed around the crack in a state where they intersect with each other when viewed from the cross section of the skeleton, so that the peripheral portion of the crack is more firmly integrated.

Further, it is desirable to inject the adhesive until the adhesive injected into the perforated hole comes out to the surface of the skeleton through the crack. This confirms that the adhesive injected into the perforated hole has penetrated the entire crack.

Further, it is desirable that the pin has an uneven surface. By having irregularities on the surface of the pin, the adhesive force with the adhesive is increased, and it becomes possible to prevent the pin from coming off.

Further, it is desirable that the pin has a diameter-expanded portion at an end portion on the surface side of the skeleton when inserted into the perforated hole. As a result, the enlarged diameter portion of the pin inserted into the perforated hole acts as a lid of the perforated hole, and the adhesive in the perforated hole can be prevented from being exposed on the surface of the skeleton. Further, when a hole is formed from the surface of the tile attached to the surface of the concrete skeleton and a pin is inserted, the enlarged diameter portion of the pin functions as a stopper for preventing the tile from falling.

Further, it is desirable that the back surface side of the skeleton of the enlarged diameter portion of this pin is tapered. As a result, the tapered portion of the enlarged diameter portion of the pin comes into close contact with the entrance of the drilled hole, and the drilled hole can be sealed.

Further, the pin is formed diagonally so that the end surface on the surface side of the skeleton is parallel to the surface of the skeleton when the perforated hole is formed diagonally with respect to the surface of the skeleton. Is desirable. As a result, when the pin is inserted into the perforated hole, the end surface of the pin becomes parallel to the surface of the skeleton, and the surface of the skeleton can be aligned with the surface.

(1) From the surface of the skeleton, a perforated hole that intersects with the crack is formed inside the skeleton, an adhesive is injected into the perforated hole, and in the perforated hole into which the adhesive is injected, the perforated hole intersects with the crack and before and after the perforated hole. By inserting a pin to connect the skeleton of the crack, the inside of the crack is repaired by the adhesive, and the pin is firmly integrated including the peripheral part of the crack, and it is possible to prevent the crack from reoccurring. It becomes.

(2) The drilled hole is formed by using a jig that sets the bit angle of the drilling drill to a predetermined angle with respect to the surface of the skeleton, so that the drilled hole is formed at a predetermined angle with respect to the surface of the skeleton. It becomes easy to form in the diagonal direction, and the construction period can be shortened.

(3) By forming the perforated hole so as to intersect the crack at the central portion in the thickness direction of the skeleton, the adhesive can be easily permeated into the entire crack.

(4) By forming the perforated holes along the cracks on the surface of the skeleton from positions that are staggered across the cracks, the pins inserted in the staggered directions across the cracks intersect when viewed from the cross section of the skeleton. Since the periphery of the crack is fixed in the state, the peripheral portion of the crack is more firmly integrated, and it becomes possible to prevent the recurrence of the crack.

(5) The adhesive injected into the perforated hole permeated the entire crack by injecting the adhesive until the adhesive injected into the perforated hole came out to the surface of the skeleton through the crack. Can be easily confirmed.

(6) Since the pin has irregularities on the surface, the adhesive force between the pin and the adhesive is increased, and it is possible to prevent the pin from coming off.

(7) Since the pin has a diameter-expanded portion at the end on the surface side of the skeleton when it is inserted into the perforated hole, the adhesive in the perforated hole can be prevented from being exposed on the surface of the skeleton. At the same time, when a hole is formed from the surface of the tile attached to the surface of the skeleton and a pin is inserted, the enlarged diameter portion of the pin can prevent the tile from falling.

(8) Since the back surface side of the skeleton of the enlarged diameter portion of the pin is tapered, the tapered portion of the enlarged diameter portion of the pin is in close contact with the entrance of the drilled hole, and the drilled hole can be sealed. ..

(9) The pin is formed diagonally so that the end surface on the surface side of the skeleton is parallel to the surface of the skeleton when the perforated hole is formed diagonally with respect to the surface of the skeleton. When a pin is inserted into the perforated hole, the end face of the pin becomes parallel to the surface of the skeleton, and it is possible to match the surface with the surface of the skeleton. No need.

It is a flow chart of the crack repair method in embodiment of this invention. It is sectional drawing which shows the formation process of a perforation hole. It is a top view which shows the drilling position of a drilling hole. It is sectional drawing which shows the injection process of an adhesive. It is sectional drawing which shows the detail of the adhesive injection process, (A) is the figure which shows the state in the middle of the adhesive injection, (B) is the figure which shows the state which the adhesive injection is completed. It is sectional drawing which shows the insertion process of a pin. It is sectional drawing which shows the construction completion state. It is a side view which shows the Example of a pin. It is a side view which shows the Example of the pin which has an enlarged diameter part. 9 is a cross-sectional view showing a state in which the pin of FIG. 9A is inserted into the perforated hole. 9 is a cross-sectional view showing a state in which the pin of FIG. 9C is inserted into the perforated hole. It is sectional drawing which shows the state which formed the perforation hole from the tile surface of the surface of a skeleton, and inserted a pin. It is explanatory drawing about the formation pitch of a perforation hole.

FIG. 1 is a flow chart of a crack repair method according to an embodiment of the present invention. Hereinafter, the crack repair method according to the embodiment of the present invention will be described with reference to the flow chart of FIG.

(S1) Formation of perforated hole First, as shown in FIG. 2, a perforated hole 3 intersecting with the crack 2 is formed from the surface 1A of the skeleton 1 in which the crack 2 is generated to the inside 1B of the skeleton 1. The formation of the perforated hole 3 is more specifically performed by the following procedure.

(S1-1) An inclined drilling attachment 10 is attached to the tip of a hand-held drilling drill (not shown). The inclined drilling attachment 10 is a jig that sets the angle θ of the bit (blade) of the drilling drill to a predetermined angle (60 ° or 45 ° in this embodiment) with respect to the surface 1A of the skeleton 1.

(S1-2) The thickness T of the skeleton 1 is examined, and the optimum drilling depth (drilling length) and drilling position are obtained from the drilling drill position list as shown in Tables 1 and 2. For example, when the thickness T (body thickness) of the skeleton 1 is 150 mm, the drilling angle is 60 °, the traveling depth (drilling length) is 130 mm, and the drilling position is 45 mm away from the crack 2. When drilling under these conditions, the drilling hole 3 intersects the crack 2 at the center of the skeleton 1 in the thickness direction.

(S1-3) When the drilling preparation is completed, the inclined drilling attachment 10 is applied to the skeleton 1 to start drilling.
(S1-4) When the planned drilling depth (drilling length) is reached, the drilling drill is stopped and slowly pulled out.
(S1-5) If the drill is an air-cooled drill, use an air duster to blow the inside of the drill hole 3 with air. For wet drills, dry the cooling water.
(S1-6) The inlet portion of the drilled hole 3 is chamfered.
(S1-7) The drilling work is completed.

As shown in FIG. 3, the drilling holes 3 are preferably positioned so as to be staggered with the cracks 2 sandwiched along the cracks 2 on the surface 1A of the skeleton 1. However, cracks 2 in narrow places and corners are perforated only on one side. Further, the pitch is set as shown in Tables 1 and 2 according to the thickness T of the skeleton. The formation pitch of the drilled holes 3 will be described later.

(S2) Injection of Adhesive Next, as shown in FIG. 4, the adhesive 5 (see FIG. 5) is injected into the perforated hole 3 using the injector 4. Specifically, the nozzle 4A at the tip of the injector 4 is inserted into the drilling hole 3, the injector 4 is pressed so that the adhesive 5 does not leak, and the adhesive 5 is slowly injected into the drilling hole 3. .. At this time, the adhesive 5 is injected until the adhesive 5 injected into the perforated hole 3 comes out to the surface 1A of the skeleton 1 through the crack 2.

The injection of the adhesive 5 is more specifically according to the following procedure.
(S2-1) When pressure is applied little by little with the injector 4, the adhesive 5 penetrates into the crack 2 as shown in FIG. 5 (A).
(S2-2) When pressure is applied as it is and the adhesive 5 is added, the adhesive 5 comes out from the surface 2A of the crack 2 as shown in FIG. 5 (B).
(S2-3) When the adhesive 5 comes out to the surface 2A, the injection of the adhesive 5 is stopped.
(S2-4) Slowly remove the injector 4 to complete the injection of the adhesive 5.

When the width of the crack 2 is wider than 0.3 mm, it is desirable to use an adhesive 5 having a high viscosity of 120 to 230 Pa · s, more preferably 170 Pa · s or more. When the width of the crack 2 exceeds 0.3 mm, if the viscosity is low, the adhesive 5 may drip in the crack 2 and may not rotate neatly in the crack 2. On the other hand, when the width of the crack 2 is narrow within 0.3 mm, it can be used even if the viscosity is low and less than 120 Pa · s, and the adhesive 5 can be neatly formed in the crack 2 without being affected by the viscosity. spin.

(S3) Insertion of Pin Next, as shown in FIG. 6, the pin 6 is inserted into the perforated hole 3 into which the adhesive 5 is injected. The pin 6 is inserted immediately after the injection of the adhesive 5. After inserting the pin 6, wipe off the adhesive 5 attached to the vicinity of the perforated hole 3 cleanly. When the adhesive 5 is cured in this state, as shown in FIG. 7, the pin 6 intersects the crack 2 and connects the skeletons 1 before and after the perforated hole 3, and the construction is completed.

Next, the pin 6 will be described in detail. As the pin 6, in addition to the round bar-shaped pin 6A shown in FIG. 8 (A), the fully screw-shaped pin 6B shown in FIG. 8 (B) and the partial pin 6 shown in FIG. 8 (C) as having irregularities on the surface. It is possible to use a rod-shaped pin 6C having irregularities on the surface. The pins 6B and 6C having irregularities on the surface are preferable to the pins 6A having no irregularities on the surface because the adhesive force with the adhesive 5 increases. In particular, since the directions of the irregularities on the surface are different from each other as in the case of the pin 6C, the pin 6C will not come off even if the pin 6C is pulled after the adhesive 5 is effective. Further, as the material of the pin 6, it is desirable to mainly use a material such as stainless steel, titanium, carbon fiber, etc., which is resistant to rust and has high tensile strength.

Further, the pin 6 has a diameter larger than that of each shaft portion at the end portion of the skeleton 1 on the surface 1A side when inserted into the drilling hole 3, as shown in FIGS. 9A to 9C. It is desirable to have a configuration having the enlarged diameter portions 7A, 7B-1, 7B-2, 7C. The enlarged diameter portions 7A to 7C can close the inlet portion of the perforated hole 3 so that the adhesive 5 in the perforated hole 3 is not exposed to the surface 1A of the skeleton 1.

Further, it is desirable that the back surface 1C side of the skeleton 1 of the enlarged diameter portions 7A to 7C has a tapered shape. The tapered portion of the enlarged diameter portions 7A to 7C is in close contact with the inlet portion of the chamfered drilling hole 3 as described above, and seals the drilling hole 3.

FIG. 10 is a cross-sectional view showing a state in which the pin 6C having the enlarged diameter portion 7A of FIG. 9A is inserted into the drilled hole 3. As shown in FIG. 10, when the pin 6C having the enlarged diameter portion 7A is inserted into the drilling hole 3, the end surface of the enlarged diameter portion 7A is slanted with respect to the surface 1A of the skeleton 1, so that the putty is filled after the insertion. Do the finishing.

Further, the enlarged diameter portions 7B-1 and 7B-2 shown in FIG. 9B can be attached to and detached from the fully screw-shaped pins 6B by screwing them into each. As a result, it becomes possible to mount the enlarged diameter portions 7B-1 and 7B-2 on the all-threaded pin 6B as needed.

Further, in the enlarged diameter portion 7B-2 shown in FIG. 9B and the enlarged diameter portion 7C shown in FIG. 9C, the end surface on the surface 1A side of the skeleton 1 is parallel to the surface 1A of the skeleton 1. It is formed diagonally. FIG. 11 is a cross-sectional view showing a state in which the pin 6C having the enlarged diameter portion 7C shown in FIG. 9C is inserted into the drilled hole 3. As shown in FIG. 11, when the pin 6C is inserted into the perforated hole 3, the end surface of the pin 6C becomes parallel to the surface 1A of the skeleton 1, and the surface of the skeleton 1 can be aligned with the surface 1A. There is no need to perform a separate face-to-face process.

FIG. 12 is a cross-sectional view showing a state in which a perforated hole is formed from the tile surface on the surface of the skeleton and a pin is inserted. As shown in FIG. 12, when a hole 3 is formed from the surface of the tile 8 attached to the surface 1A of the skeleton 1 and the pin 6C is inserted, the enlarged diameter portion 7C of the pin 6C causes the tile 8 to fall. It is possible to prevent the tile surface from floating or peeling off.

Next, the formation pitch of the drilled holes 3 will be described with reference to FIG. FIG. 13 shows how the adhesive 5 permeates inside the skeleton 1. In the crack repair method in the present embodiment, the perforated hole 3 is formed so as to intersect the crack 2 at the central portion in the thickness direction of the skeleton 1, so that the adhesive 5 draws a circle from the central portion of the crack 2. It will penetrate. Then, after injecting for a while, the adhesive 5 comes out from the front surface 1A of the skeleton 1, but in this state, the adhesive 5 also comes out from the back surface 1C of the skeleton 1. At this time, by forming the perforated holes 3 at a pitch such that the adhesives 5 are connected to each other, the adhesives 5 are connected to each other inside the crack 2 and the antioxidant effect, the waterproof effect, the strength, etc. inside the skeleton 1 can be enhanced. can.

The present invention, building concrete building frame, are useful as a crack repair construction method for repairing a crack generated in the bonded tiles or the like on the surface of the concrete skeleton, in particular, cracks occurred to skeleton, cracks of tightly integrated, including up to the peripheral portion, it is preferable as a crack repair construction method capable of preventing the re-occurrence of cracks.

1 Frame 2 Crack 3 Perforation hole 4 Injector 5 Adhesive 6,6A, 6B, 6C Pin 7A, 7B, 7B-1, 7B-2, 7C Enlarged diameter part 10 Inclined perforation attachment

Claims (4)

It is a crack repair method that repairs cracks that occur in the concrete frame.
The tip portion of the trephine drill handheld, a predetermined drilling angle theta = 60 ° oblique direction with respect to the angle of the bit drilling the drill of the hand-held by exposing the surface of the concrete skeleton the concrete skeleton surface Attaching a fixed tilted drilling attachment or a tilted drilling attachment fixed at a given drilling angle θ = 45 °,
Said handheld the inclined perforations for attachment attached to the leading end portion of the trephine drill against the surface of the concrete skeleton, corresponding to the thickness T of the concrete skeleton and the perforated angle theta = 60 ° or theta = 45 ° Based on the drilling drill position list showing the drilling length and the drilling position that is a place away from the crack, the handheld type under the conditions of the optimum drilling length and the drilling position taken from the thickness T of the concrete skeleton. by puncturing the trephine drill, to form the perforation angle theta = 60 ° or perforation holes of theta = 45 ° intersecting the cracks in the interior of the concrete skeleton from the surface of the concrete skeleton,
Injecting an adhesive into the perforated hole,
A crack repair method comprising inserting a pin for connecting a concrete skeleton before and after the perforated hole, which intersects with the crack, into the perforated hole into which the adhesive is injected. The drilling drill position list further shows a pitch corresponding to the thickness T of the concrete skeleton and the drilling angle θ = 60 ° or θ = 45 ° , and the drilling hole is the drilling drill position list. crack repairing method according to claim 1, wherein the drilling at a pitch corresponding to the thickness T of the concrete skeleton shown in. The crack repair method according to claim 1 or 2 , wherein the perforated hole is formed so as to intersect the crack at a central portion in the thickness direction of the concrete skeleton. The crack repair method according to any one of claims 1 to 3 , wherein the pin has irregularities on its surface.

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