JP2016044452A - Repair tool and repair method for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair tool and a repair method for a concrete structure that readily and promptly repairs a crack, an exfoliation and other damage in a concrete structure at a low cost, while preventing enlargement of the crack and damage and resolving problems such as rusting of a metallic material and an explosive fracture of concrete caused by the rusting.SOLUTION: Planting bolts 1, 1, ... made of mortar are planted around a damaged site 21A on a wharf 21. A columnar body 2 that constitutes the planting bolt 1 has a spiral engaging groove 3 formed on an outer peripheral surface 2C from an intermediate part 2A to a tip side 2B, and the tip side is formed as a conical protrusion 4. A male screw part 5 is formed on the outer peripheral surface 2C of the columnar body 2, between the intermediate part 2A and a rear edge 2D. The planting bolt 1 is inserted into a bolt hole 11A on a cover plate 11, and a hexagonal nut 7 is screwed on the male screw part 5. Here, the planting bolt 1 and the hexagonal nut 7 are made by molding mortar.SELECTED DRAWING: Figure 1

Description

The present invention relates to a repair tool for a concrete structure and a repair method for a concrete structure for repairing a crack or a damaged portion generated in a concrete structure such as a quay, a dike, a dam jetty, and a pier.

  Concrete structures such as quays, dikes, and dam jetty are composed of a combination of concrete and steel, but the concrete gradually becomes alkaline in contact with acid rain and atmospheric oxides. As the concrete is alkalized, the steel frame rusts, and when the rust further expands, the steel frame expands by about 9%. Finally, the concrete explodes due to the expansion pressure, and the concrete structure is cracked and peeled off. As a result, the strength of the concrete structure is reduced.

As a method of repairing cracks and damaged parts of this concrete structure, mortar is conventionally filled with pressure to the cracks, and mortar is applied to the damaged parts. The repair method of doing is performed. In addition, as a repair method for the dike, there is a Gotoku stitch water-proof method. Before the pile member 10 is driven into the slope 2 around the crack 1, the tubular member 20 is driven to form the driving hole 19, and then the pile member 10. A technique for implementing the Gotoku sewing water-proofing method by driving in (Patent Document 1) has been proposed.

JP2011-111825A

  In the above-described prior art, the method of simply filling mortar with cracks or damaged parts is in a state where the mortar covering the damaged parts is exposed, so infiltration of rainwater is inevitable, and is only a temporary repair, so it is durable. There is a problem of lacking. In addition, there is a drawback that rusting of bolts and nuts cannot be avoided by repairing a repair plate that covers the damaged part by fixing it to a concrete structure with metal bolts and nuts. Furthermore, in the Gotoku seaweed flood control method, the upper ends of a plurality of pile members driven into the slope are crossed and fastened with a string, and a sandbag as a weight is placed on the upper side from the fastening part. There are disadvantages that it cannot be used for repairing inclined surfaces, troublesome repair work, high costs, and lack of durability.

  The present invention has been made in view of the above-mentioned drawbacks of the prior art, and can easily, quickly, and inexpensively repair damaged parts such as cracks and delaminations generated in concrete structures, and expand cracks and damages. An object of the present invention is to provide a repair tool for a concrete structure and a repair method for the concrete structure capable of preventing the above.

Means constituting the invention according to claim 1 for solving the above-mentioned problem is a repair tool for attaching a non-metallic cover plate covering a repaired portion of a concrete structure to the concrete structure. The planting bolt to be inserted in a state where the bolt planting hole of the concrete structure is filled with mortar is formed with a helical locking groove on the outer peripheral surface from the intermediate part of the columnar base to the axial front end side. The tip side is formed in a conical protrusion, and has a shape in which a male screw part is formed on the outer peripheral surface from the intermediate part to the axial rear end, and the male screw part of the planted bolt inserted into the bolt through hole of the cover plate The cover plate is brought into intimate contact with the concrete structure by screwing the nut into the nut, and the nut and the planting bolt are made of mortar.

  And the said planting bolt is good to project apart the some attitude | position holding piece in the outer peripheral surface of the front end side from the said intermediate part.

  The nut may be made non-rotatable by a non-rotating pin that is inserted in the axial direction and locked to the cover plate.

  Furthermore, the planting bolt and / or nut may be mortar-molded with a reinforcing material made of a non-metallic material.

Further, the means constituting the invention according to claim 5 is a repairing method for attaching a non-metallic cover plate covering a repaired portion of a concrete structure to the concrete structure, wherein A helical locking groove is formed on the outer peripheral surface from the site to the front end side in the axial direction, and the front end side is formed as a conical protrusion, and a male screw portion is provided on the outer peripheral surface from the intermediate site to the rear end in the axial direction of the cylindrical base. The formed installation bolt is inserted by filling the bolt installation hole of the concrete structure with mortar, and the installation bolt is inserted into the bolt through hole of the cover plate, and the nut is screwed from the outside. The cover plate is brought into close contact with the concrete structure by fastening together.

  And the said planting bolt is good to project apart the some attitude | position holding piece in the outer peripheral surface of the front end side from the said intermediate part.

Since the present invention is configured as described above, the following effects can be obtained.
(1) The repair part of the concrete structure is covered with a non-metallic cover plate, and the cover plate is repaired by fastening it to the concrete structure with mortar-shaped planting bolts and nuts, and no metal material is used. Because it is configured, it is possible to repair with excellent durability by completely eliminating the problem of rusting that causes harmful alkalinity to concrete structures, and the situation that damages the landscape because it does not cause discoloration due to rust red Can also be eliminated.
(2) Since the cover plate is configured to be intimately fastened with a nut to a planting bolt inserted into a concrete structure, repair work can be performed in a short time and at low cost.
(3) Since the planted bolts and nuts are manufactured by mortar molding and no metal material is used, the conventional problem that the concrete structure explodes due to the increased volume of rusted metal bolts and nuts. It can be completely eliminated and the durability of the concrete structure can be greatly increased. Moreover, the repair cost is low.
(4) Since the planting bolt has a helical locking groove on the outer peripheral surface and the tip side is formed in a conical projection, it can be easily inserted by screwing into a bolt planting hole filled with mortar. In addition, since the mortar is cured in the helical locking groove, it can be securely and firmly fixed to the concrete structure.
(5) Since the planting bolt has a plurality of posture holding pieces protruding from the outer peripheral surface, the planting bolt can be easily inserted into a bolt planting hole of a concrete structure lacking slidability, and each posture Since the holding piece is attached to the cured mortar, the planting bolt can be firmly fixed to the concrete structure.
(6) Since the position of the planting bolt inserted around the repair location is fixed by the cover plate, it is possible to prevent the cracks in the concrete structure from expanding.
(7) Since the reinforcing material made of non-metallic material is mixed into the planting bolt and / or nut and mortar molded to give high strength, it is possible to expand the crack and damage of the concrete structure as much as possible. Can be prevented.

It is a side view which shows the whole structure of the repair tool for concrete structures which concerns on embodiment of this invention. It is a front view of a planting bolt. It is explanatory drawing of the use procedure of a repair tool. It is sectional drawing of the state which attached the cover board to the quay with a repair tool.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, 1 is a planting bolt, and the planting bolt 1 is inserted into a bolt planting hole 22 drilled in a quay wall 21 which is a concrete structure. Reference numeral 2 denotes a columnar base constituting the planted bolt 1, and the columnar base 2 is made of mortar-molded cement and is formed to have substantially the same diameter over the entire length. Reference numerals 3 and 3 denote two helical locking grooves formed on the cylindrical base body 2. The helical locking grooves 3 and 3 are spaced apart from each other by 180 degrees in the circumferential direction from the axial intermediate portion 2A of the cylindrical base body 2. The outer peripheral surface 2C is formed on the distal end side 2B. The tip side 2B of the cylindrical base 2 is formed as a conical protrusion 4.

  Reference numeral 5 denotes a male screw portion formed on the cylindrical base body 2, and the male screw portion 5 is formed on the outer peripheral surface 2C from the intermediate portion 2A of the cylindrical base body 2 to the rear end 2D in the axial direction. Reference numeral 6 denotes a groove-like torque application portion formed on the rear end surface of the cylindrical base body 2. The torque hooking portion 6 can easily screw the planting bolt 1 into the bolt planting hole 22 filled with the mortar 23 by applying a rotational force by engaging a large screwdriver or a metal plate.

  7, 7,... Are a plurality of posture holding pieces that are located between the locking grooves 3, 3 and project from the outer peripheral surface 2 </ b> C of the cylindrical base 2 so as to be spaced apart in the circumferential direction and the axial direction. Each of the posture holding pieces 7 has a center line of the planting bolt 1 with respect to the axis of the bolt planting hole 22 drilled so as to be easily inserted with a hole diameter slightly larger than that of the planting bolt 1. This is to maintain the posture so as to be along, and to prevent the planting bolt 1 from being tilted and planted with respect to the quay wall 21. And each attitude | position holding piece 7 makes it easy to insert in the bolt planting hole 22 with which the mortar 23 was filled by forming the upper surface 7A in an upward inclined surface toward the rear end.

Note that the posture holding piece 7 may be formed integrally with the columnar base 2 with mortar, or may be formed with a synthetic resin material and implanted when the columnar base 2 is formed. Alternatively, a holding piece structure formed by separating three synthetic resin plates having the upper end side as the posture holding piece 7 at 120 degrees in the circumferential direction may be molded and integrated at the time of forming the cylindrical substrate 2.

Thus, the planting bolt 1 forms the helical locking grooves 3 and 3 from the intermediate portion 2A of the cylindrical base 2 made of mortar to the axial front end side 2B, and the front end side 2B is formed in the conical protrusion 4, and the intermediate The axial rear end 2D from the portion 2A has a shape in which the male screw portion 5 is formed, and the length and diameter thereof may be set variously so as to correspond to the size and thickness of the cover plate 11 described later.

  Reference numeral 8 denotes a mortar hex nut screwed onto the planting bolt 1. The hexagonal nut 8 is integrally formed with a nut main body 8A having six outer surfaces on which a spanner is hung and a female threaded portion 8B that is formed in the central opening of the nut main body 8A and is screwed into the male threaded portion 5 of the planting bolt 1. Made up of.

Reference numerals 9 and 9 denote pin insertion holes formed outside the female screw portion 8B and penetrating through the nut body 8A in the axial direction. The hexagon nut 8 is prevented from loosening by inserting the rotation prevention pins 10 into the respective pin insertion holes 9 and driving or press-fitting the distal end side of the rotation prevention pins 10 into the cover plate 11.

11 is a cover plate made of mortar that covers the damaged portion 21A of the quay 21. The cover plate 11 is formed into a substantially rectangular flat plate, and a plurality of bolt through holes 11A, 11A,. is there.

  Although the repair tool which consists of this Embodiment consists of the above-mentioned structure, the effect | action is demonstrated with reference to FIG.3 and FIG.4 next. For example, when repairing the damaged portion 21A formed in the concave shape on the quay 21, a plurality of bolt installation holes 22, 22,... Are drilled so as to surround the damaged portion 21A. After filling the planting hole 22 with the mortar 23 with the injection gun G, the planting bolt 1 is inserted into the bolt planting hole 22.

  The planting bolt 1 is formed with a conical protrusion 4 on the tip side 2B, and a helical locking groove 3 is formed on the outer peripheral surface 2C. Therefore, when the planting bolt 1 is pushed in while rotating, the mortar 23 is spiraled. Since the inside of the locking groove 3 smoothly flows, the planting bolt 1 can be easily inserted without applying a large force. The installation bolt 1 can be easily screwed by engaging a large screwdriver or a metal plate with the torque hook 6 and rotating it while pressing. After the insertion, the mortar 24 in the bolt installation hole 22 is cured, so that the installation bolt 1 is firmly attached to the quay wall 21.

Next, the mortar 24 is filled with an injection gun G or scissors in the concave portion of the damaged portion 21A of the quay 21 and leveled, and then the installation bolt 1 is inserted into the bolt through holes 11A, 11A,. The damaged portion 21A is covered, and the hexagon nut 8 is screwed and fastened. Finally, the non-rotating pin 10 is inserted from the hexagon nut 8 to the cover plate 11 to prevent the hexagon nut 8 from loosening.
In the above procedure, the operation of planting the planting bolt 1 on the quay 21 and the repairing operation of filling the repair location 21A with the mortar 23 may be performed before and after.

In this way, the covering plate 11 is brought into close contact with the quay 21 while covering the damaged portion 21A, so that the mortar 23 filled in the damaged portion 21A is not directly exposed to rainwater or snowfall, and is affected by wave power. In addition, since the degraded portion around the damaged portion 21A is also covered, the quay wall 21 can be made durable. And it can also suppress that the crack of the quay 21 expands because the cover board 11 connects several planting bolts 1, 1, ... integrally.

In the above operation, in order to allow the mortar planting bolt 1 lacking slidability to be easily inserted into the quay wall 21 which is a concrete structure lacking slidability, the bolt planting hole 22 is provided with the planting bolt 1. The diameter is set somewhat larger than the diameter. However, since the male screw part 5 having a length approximately half that of the installation bolt 1 protrudes downward from the quay wall 21 with respect to the wall surface, the position with respect to the bolt through hole 11A is shifted and the cover plate 11 is assembled. A difficult situation occurs.
Therefore, a plurality of posture holding pieces 7 are provided on the outer side of the planting bolt 1 so as to be separated from each other in the circumferential direction and the axial direction, and each posture holding piece 7 is in contact with the inner surface of the bolt planting hole 22 so The planting bolt 1 can be easily inserted into the bolt planting hole 22 by making the contact surface as small as possible. In addition, since the mortar 24 that has bitten each posture holding piece 7 is cured, the planting bolt 1 can be firmly planted by the quay 21.

  In the present invention, when the planting bolt 1 and the hexagon nut 7 are mortar-molded, the strength is increased by mixing a reinforcing material made of a non-metallic fibrous material such as glass fiber or carbon fiber into cement. Good.

  In the present embodiment, the two cylindrical locking grooves 3 and 3 are formed in the columnar base 2, but the number of the helical locking grooves is not limited to the embodiment. One or three may be sufficient.

DESCRIPTION OF SYMBOLS 1 Planting bolt 2 Cylindrical base body 2A Intermediate part 2B Front end side 2C Outer peripheral surface 2D Rear end 3 Helical locking groove 4 Conical protrusion 5 Male thread part 7 Position holding piece 8 Hexagon nut 10 Detent pin 11 Cover plate 21 Quay ( Concrete structures)
21A Damaged part 22 Bolt planting hole 23 Mortar

Claims (6)

A repair tool for attaching a non-metallic cover plate covering a repaired portion of a concrete structure to the concrete structure, which is inserted in a state where mortar is filled in a bolt installation hole of the concrete structure. The implanted bolt is formed with a helical locking groove on the outer peripheral surface from the intermediate part of the cylindrical base body to the axial front end side, the front end side is formed as a conical protrusion, and extends from the intermediate part to the axial rear end. The outer plate has a shape in which a male thread portion is formed, and the cover plate is brought into close contact with the concrete structure by screwing a nut into the male screw portion of the planted bolt inserted into the bolt through hole of the cover plate. A concrete structure repair tool in which the nut and the planting bolt are mortar molded.   The repairing tool for a concrete structure according to claim 1, wherein the planting bolt has a plurality of posture holding pieces protruding from the intermediate portion on the outer peripheral surface on the tip side.   2. The repair tool for a concrete structure according to claim 1, wherein the nut is made non-rotatable by a non-rotating pin that is inserted in an axial direction and locked to the cover plate.   The repairing tool for a concrete structure according to claim 1, wherein the planting bolt and / or nut is formed by mortar forming a reinforcing material made of a non-metallic material. A repair method for attaching a non-metallic cover plate covering a repaired portion of a concrete structure to the concrete structure, which is helically locked to the outer peripheral surface from the intermediate portion of the columnar base to the axial front end side A concrete structure is provided with a planting bolt having a groove, a tip formed in a conical protrusion, and an external thread formed on the outer peripheral surface from the intermediate portion to the rear end in the axial direction of the cylindrical substrate. The mortar is filled with mortar and inserted, and the bolt is inserted into the bolt through hole of the cover plate, and a nut is screwed from the outside to fasten the cover plate. A method for repairing concrete structures that are in close contact with concrete structures.   6. The method for repairing a concrete structure according to claim 5, wherein the planting bolt has a plurality of posture holding pieces protruding from the intermediate portion on the outer peripheral surface on the tip side.